Compressed Air Guidelines

7/27/2019 Compressed Air Guidelines

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Compressed Air System Study Guidelines

Custom Audit and Efficiency Program

April 2012 v 1.0


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TABLE OF CONTENTS

1 COMPRESSED AIR SYSTEM STUDY OVERVIEW ..............................................................................11.1 APPLICATION PREAPPROVAL AND ELIGIBILITY ..................................................................................... 1

1.2 STUDY,REPORT AND PAYMENT........................................................................................................ 1

1.3 INCENTIVES................................................................................................................................... 2

1.4 PROGRAM CONTACT INFORMATION ................................................................................................. 2

2 COMPRESSED AIR STUDY PROVIDERS ..........................................................................................32.1 QUALIFICATIONS AND ROLE............................................................................................................. 3

2.2 ADDITIONAL CUSTOMER SERVICES.................................................................................................... 3

2.3 PAYMENT FOR PROGRAM SERVICES .................................................................................................. 3

3 APPLICATION AND PREAPPROVAL ...............................................................................................43.1 APPLICATION REVIEW..................................................................................................................... 4

3.2 PREAPPROVAL ............................................................................................................................... 4

4 SYSTEM STUDY ...........................................................................................................................54.1 SITE ASSESSMENT .......................................................................................................................... 5

4.2 DATA COLLECTION ......................................................................................................................... 6

5 COMPRESSED AIR SYSTEM STUDY REPORT ..................................................................................75.1 ENERGY SAVINGS CALCULATIONS ..................................................................................................... 7

5.2 REPORT DELIVERY .......................................................................................................................... 8

Appendix A Compressed Air Study Application ................................................................................ A-1

Appendix B Calculation & Measurement Guidelines ......................................................................... B-1


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Compressed Air System Study Guidelines 1

1 COMPRESSED AIR SYSTEM STUDY OVERVIEWThe Compressed Air System Study (Study) is an energy efficiency offering that helps customers obtainexpert compressed air analysis at a reduced cost in order to help lower electric energy costs by

improving their compressed air system efficiency. The Study focuses on examination of the compressed

air system in order to optimize equipment operation and compressed air end-use and offers a complete

system analysis of both supply and demand side opportunities. Compressed Air Studies are conducted

by customer-contracted Study Providers.

Examples of typical energy conservation measures (ECMs) include:

No-cost or low-cost (ECMs)o Reduce compressed air leakso Reduce demand of end use equipmento Replace inappropriate end useso Install no-loss condensate drainso Optimize sequence of compressor operationo Optimize system air pressure setpoint

Capital improvement ECMs:o Compressor or dryer replacemento Increase compressed air storage capacityo Replace air powered pumps with electrico Compressor control system upgrades

1.1 Application Preapproval and Eligibility1. Facility must be a Vectren commercial or industrial electric customer.2. A complete and signed Compressed Air System Study Application must be submitted for formal

preapproval. Incomplete forms will not be processed. Vectrens pre-approval is required (i.e.

formal letter authorizing Customer to proceed) prior to commencing any reimbursable

Compressed Air System Study work tasks (including but not limited to executing a contract

agreement, completing project work tasks, conducting kick-off meeting, etc.).

3. In reviewing applications for preapproval, Vectren will look for evidence that cost-effectiveCompressed Air opportunities exist at the facility. The quoted Study Cost will be considered

along with the facilitys compressed air system type, size, control capabilities, Customers

financial and staff resources for measure implementation, and availability of facility staff for

study activities. Additional information about the application review and selection process is

provided in Section 3.

1.2 Study, Report and Payment1. Once preapproved, the Study must be completed in accordance with the guidelines in this in

Section 4.


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SECTION1 Compressed Air System Study Overview


2. The Study Provider will conduct the preapproved Study and send the draft Compressed AirSystem Study Report (Report) to Vectren for review. Vectrens Program Administrator will

review the content of the Report and the supporting calculations and communicate any

recommended revisions to the Study Provider. The Study Provider will update the report per

Vectrens recommendations.

3. Report shall at a minimum include energy and utility projections and recommendations forreducing Customers energy costs, installing or improving systems controls and/or taking other

measures that meet the Companys energy efficiency incentive guidelines. Report shall contain a

simple payback analysis. Reporting requirements are discussed in further detail in Section 5.

4. Upon approval of the final draft by the Program Administrator, Vectren will deliver the finalReport to the customer and begin processing payment of the cost-share incentive.

1.3 IncentivesVectren offers a cost-share incentive of up to 50% or $10,000 on Compressed Air Studies to cover costs

for a Study Provider to investigate and identify savings opportunities at a Vectren Customer facility.Cost-sharing on Compressed Air System Studies is subject to preapproval. Official cost-share incentive

will be provided to the customer along with study preapproval. Incentives will be paid to the customer

upon receipt and approval of a final Report that meets the program requirements outlined in this

document. The Study Provider is responsible for invoicing the customer for the total study cost. Vectren

will not reimburse Study Providers directly. Customer should allow up to six weeks from receipt of final

Report for cost-share payment.

In addition, Customers are eligible for cash incentives towards the implementation of identified energy

efficiency opportunities resulting from the Study. Before implementation of measures, identified

opportunities must be preapproved through the Custom program. Incentives are equivalent to thoseoffered for any Custom project through the Custom Audit and Efficiency Program.

Compressed air leaks, maintenance work and other no-cost or low-cost energy efficiency opportunities,

those with a simple payback below 1.5 years, should be identified by the Study Provider. Such repairs,

however, are not eligible for additional incentives. Additional questions regarding eligible project and

incentives should be directed to the program through the channels detailed below.

1.4 Program Contact InformationAll Study Provider questions about Compressed Air System Studies should be directed to Vectrens

Custom Audit and Efficiency program or Vectrens Program Administrator, Nexant, at:

Vectren, Marketing & Conservation

P.O. Box 513, Evansville, IN 47703

Phone: 608-824-1239

Fax: 608-827-2973

Email:[email protected]
mailto:[email protected]:[email protected]:[email protected]:[email protected]


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2 COMPRESSED AIR STUDY PROVIDERS2.1 Qualifications and RoleVectren does not have a formal qualification process for Compressed Air System Study Providers. Study

Providers are expected to be professionals with experience completing similar system studies. Study

Providers are expected to identify energy efficiency opportunities and determine their energy savings

and cost impacts as a part of the scope of work. System Studies that only recommend equipment

upgrades will not be eligible for cost-sharing through this program; the Study Provider is expected to

find low and no-cost opportunities that the customer can implement with minimal investment. Study

Providers are expected to follow the guidelines outlined in this document and work collaboratively with

Vectren, their Program Administrator and the Customer, to deliver a system study and report that both

satisfies Customer needs and meets Vectrens Custom Audit and Efficiency program requirements.

2.2 Additional Customer ServicesDue to the expertise of the Study Providers and their involvement in the System Study, some Customers

may request that Study Providers conduct implementation services, such as equipment sales,

mechanical contracting, significant controls modifications, and electrical installation. Vectren

encourages these relationships and supports the delivery of implementation services; however, costs

related to implementation, sales, and other services may not be included in the quoted Study Costs.

For projects eligible for additional custom incentives, equipment and labor costs should be included in

the Custom Project Application.

2.3 Payment for Program ServicesStudy Providers are responsible for invoicing customers for 100% of Study Costs. Vectren will pay cost-

share incentives to the customer upon receipt and approval of a final Report that meets the program

requirements outlined in this document. Vectren will not reimburse Study Providers directly. Customer

should allow up to six weeks from receipt of final Report for cost-share payment.


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3 APPLICATION AND PREAPPROVALThe Compressed Air System Study begins with the Application Phase. A Compressed Air System Study

Application should be completed by the facility owner/representative and the Study Provider andsubmitted. Vectren will evaluate complete applications and select those with high potential for cost

effective energy saving measures.

3.1 Application ReviewIn reviewing program applications, the Program Administrator will give preference to facilities with the

following characteristics:

At least 250 hp of non-backup compressed air capacity No planned major system renovations or retrofits Accessible and up to date system documentation and records Compressed air system with relatively high normalized energy consumption (e.g. kW/100

CFM)

Customer willingness and resources to implement potential study recommendations A commitment by the facility owner and O&M staff to be actively involved in the

Compressed Air Study. Active involvement will include:

o Providing access to the facilityo Providing time for facility personnel to interface with the Compressed Air Study

Provider

o Providing and assisting with the reporting, and collection of, information pertainingto the Study of the system.

3.2 PreapprovalUpon completion of the application review Vectren will issue an official letter to the customer and Study

Provider detailing preapproved incentive funds or facility ineligibility. Incentives funds will be reserved

for 90 calendar days after preapproval. Customers in need of an extended incentive reservation must

receive approval from Vectren or the Program Administrator. Program funding is reserved on a first-

come, first-served basis and Vectren cannot guarantee funding for projects installed after the incentive

reservation has expired.


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4 SYSTEM STUDYFollowing the preapproval of an application, the Study Provider, with assistance from the facility

engineering staff, can begin the Compressed Air System Study. Principal System Study activities include

the following:

Working with facility staff to identify energy efficiency opportunities. Gathering additional information to assess equipment operation. Estimating the potential electric energy savings for identified opportunities. Providing internal cost estimates or third-party vendor quotes for the implementation of

identified opportunities.

4.1 Site AssessmentThe Study Provider will work with the Customer to conduct a compressed air system assessment aimed

at identifying and quantifying energy and demand savings opportunities. The Study Provider willcoordinate an appropriate time to conduct the focused assessment at the Customers facility when the

system is operating normally.

The focused assessment includes activities such as conducting detailed site assessments, diagnostic

testing, and trending analyses to evaluate current operating procedures, equipment functionality, and

to verify the preliminary site assessment assumptions. It involves the detailed investigation of the

energy efficiency opportunities identified in the preliminary site assessment, and further investigation to

identify additional opportunities. The Study Provider should also consult with the facilitys personnel to

understand their concerns and identify areas where additional focus may be warranted. The focused

assessment will include the following activities:

Identification and tagging of air leaks1 Assessment of demand-side air usage, including an inventory of air end-uses, pressure drops

and recommendations for reducing air wastage

Equipment inventory and a system block diagram showing major equipment, end uses,valves, filters, etc.

Description of facility operations, standard operating parameters, including dischargepressure set points, operating hours, and control strategies

System monitoring over the course of at least two weeks of standard use for the facility tomonitor system pressure, compressor power, and other equipment as necessary

1Compressed air leaks are within the scope of the study but are not eligible for incentives. The Study Provider

should provide the Customer with a list of air leaks and other air wastage, identifying the location and estimated

size (CFM) of each, and the anticipated cost of air wastage.


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SECTION4 System Study


Estimation of peak kW consumption, peak air flow rate, system energy consumption andannual operating costs

Recommendations for cost-effective, energy saving equipment upgradesFindings from these activities should be incorporated in the report including:

Description of the compressed air equipment and major compressed air end uses Project overview including goals, roles, and responsibilities Review of utility usage data Identification, description, and feasibility of potential energy efficiency opportunities Spot measurements or trend data (e.g. from control system front-end or hand-held meter),

nameplate data, etc.

4.2 Data CollectionBecause a successful Compressed Air System Study relies heavily on accurate and comprehensive

characterization of all identified energy savings opportunities, the Study Provider must exerciseadditional due diligence in collecting data, documenting field conditions, and calculating savings. The

Study Provider will document the following for each identified energy savings opportunity:

Functional tests required characterizing the opportunity. Governing engineering equations for calculating energy savings. Necessary inputs to the equations, to be trended or measured. Identification of data collection mode (facility EMCS, stand-alone loggers, spot

measurements, etc.).

Operating conditions for which savings will occur, and necessary data collection period.Following the steps listed above will ensure that the Study Provider will not be required to revisit the

facility to collect additional data after the core investigative work has been completed.


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5 COMPRESSED AIR SYSTEM STUDY REPORTThe Compressed Air System Study Report (Report) includes a summary of the findings, and

recommendations for next steps, provides details of the completed system study and documents the

estimated annual energy savings, implementation costs, and a simple payback period of all identifiedopportunities.

The final assessment report shall include the following sections.

1. Executive Summary2. Detailed description of the existing compressed air system and its operation.

a. Provide detailed existing equipment nameplate information (motor HP, equipmentcapacity, efficiency, type, location, service area, controls, etc.).

b. Provide a supply and demand side one-line diagram showing generation equipment &significant end uses

3.

Review and analysis of current utility consumption data. This analysis should include:a. Estimated energy consumed for the compressed air system.b. Energy costs from utility bills ($/kWh, $/kW).

4. Description of current system(s) performance and any operational issues.5. Provide a detailed list of test procedures, results of testing and corrective actions for the system.6. Provide a detailed description of the energy efficiency opportunities being evaluated, including

control strategy (where applicable). Describe how it will save energy. Provide a system diagram

to illustrate as necessary.

7. Include detailed savings calculations, implementation costs and payback analysis for proposedopportunities.

8. Include all energy savings and project cost calculations as exhibits to the final report. Savingscalculations should be based on actual utility rates and actual production schedules.

9. Describe an implementation strategy and list any implementation issues associated withproposed energy efficiency opportunities.

5.1 Energy Savings CalculationsUtilizing the information gathered during the system study, the Study Provider is responsible for

identifying potential energy efficiency opportunities in the compressed air system. For each identified

opportunity, the Study Provider will evaluate and document the following parameters:

Annual electric energy savings potential Peak electric demand savings potential Technical feasibility Likelihood of owner buy-in Accessibility and constructability Estimated implementation cost Savings persistence

All calculations must be submitted in detail, as well as any data used in support of the calculations.

Because implementation costs are paid by the customer on the basis of the estimates provided in the


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SECTION5 Compressed Air System Study Report


Report, it is essential that the savings calculations are accurate. Estimates for implementation costs

must be accurate market costs and must be obtained directly from the owner, vendor or an accepted

cost estimating source.

Savings calculations must be supported by field observations, actual equipment specifications, and

operating conditions. Calculations must be done in spreadsheet format, and be clearly presented for

review. Calculations based solely on rules of thumb or unsupported assumptions are not acceptable.

Calculations done using simulation software will not be accepted without prior written approval from

Vectren. Supporting documentation delivered with the report shall include sufficient raw data from the

assessment so that the energy savings associated with the opportunities. This documentation shall be

structured so it can be easily accessed by the Program Administrator and other persons not involved in

its development.

The program provides Calculation and Measurement Guidelines to Study Providers to set expectations

for calculation requirements. Calculation and Measurement Guidelines are included in Appendix B.

5.2 Report DeliveryThe Study Provider must submit the draft Report and all supporting files to Vectren and the Program

Administrator for review. Vectrens Program Administrator will review the content of the Report and the

supporting calculations and communicate any recommended revisions to the Study Provider. The Study

Provider is responsible for revising the supporting calculations and draft Report in collaboration with

Vectren and the Program Administrator and delivering a final report to Vectren. Vectren will review and

approve the final report and begin processing payment of the Customer cost-share incentive. After

receiving final approval by Vectren, the Study Provider is free to deliver the Report to the Customer. The

Study Provider should not deliver the final report, report drafts or preliminary results to the customer

prior to final approval by Vectren.


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Compressed Air System Study Guidelines A-1

Appendix A Compressed Air Study Application


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What is it?

How do I apply?

Available Cost Share & Incentives

Additional Information

Compressed Air System Study

1. Review this application and the provided Compressed Air System Study Guidelines document.

All questions should be directed to Vectrens Custom Audit and Efficiency program at [email protected].

1. Review this application and the provided Compressed Air System Study Guidelines document.

2. Premise must be a Vectren commercial/industrial electric customer.

3. Submit a complete and signed Compressed Air System Study Application for formal preapproval.Incomplete forms will not be processed. Submit by email: [email protected], fax: (608) 829-2723, or mail

to: ATTN: Vectren, Marketing & Conservation, P.O. Box 513, Evansville, IN 47703.

Vectrens pre-approval is required (i.e. formal letter authorizing Customer to proceed) prior to commencing

any reimbursable Compressed Air System Study work tasks (including but not limited to executing a

contract agreement, completing project work tasks, etc.).

In reviewing applications for preapproval, Vectren will look for evidence that cost-effective Compressed Air

opportunities exist at the facility. The quoted Study Cost will be considered along with the facilitys

compressed air system type, size, control capabilities and availability of facility staff for study activities.

Cost-share on a Compressed Air System Study is subject to preapproval. Official cost-share incentive

amount will be provided to the customer along with study preapproval.

Incentives will be paid to the customer upon receipt and approval of a final Report that meets the program

requirements outlined in the Compressed Air System Study Guidelines. Allow up to 6 weeks from reciept of

final Report for cost-share payment.

Complete information regarding application review and compressed air study requirements and

deliverables is provided in the Compressed Air System Study Guidelines document.

1. Vectren offers a cost-share incentive of up to 50% or $10,000 on Compressed Air Studies to cover costs for

a study provider to investigate and identify savings opportunities at a Vectren customer facility. Vectren

will pay cost-share incentives to the customer upon receipt and approval of a final Report that meets the

program guidelines. Vectren will not reimburse Study Providers directly. Customer should allow up to six

weeks from receipt of final Report for cost-share payment.

2. In addition, customers are eligible for cash incentives towards the implementation of identified energy

efficiency opportunities resulting from the Study. Before implementation of measures, identified

opportunities must be preapproved through the Custom program. Incentives are equivalent to those

offered for any Custom project through the Custom Audit and Efficiency Program.

3. Compressed air leaks, maintenance work and other no or low cost energy efficiency opportunities should

be identified by the system study provider, however such repairs are not eligible for additional incentives.

Additional questions regarding eligible project and incentives should be directed to the program through

the channels detailed above.

The Compressed Air System Study is an energy efficiency offering that helps customers obtain expert

compressed air analysis at a reduced cost in order to help lower electric energy costs by improving their

compressed air efficiency. The Study focuses on examination of the compressed air system in order to optimize

equipment operation and compressed air end-use and offers a complete system analysis of both supply and

demand side opportunities. Compressed Air Studies are conducted by customer-contracted study providers.


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I. Customer Information

Corporation Partnership

Limited Liability Corporation Exempt

Sole Proprietorship Other

State

II. Study Provider Information

State

III. Authorization

Study Provider Signature Date

By signing this form, the Study Provider agrees to follow the Study Provider Guidelines. Study Providers are expected to identify energy efficiency opportunities and determine their

energy savings and cost impacts as a part of the scope of work. System Studies that only recommend equipment upgrades will not be eligible for cost-sharing through this program.

Study Providers are expected to work collaboratively with Vectren, their Program Administrator and the Customer, to deliver a system study and report that both satisfies Customer

needs and meets Vectrens Custom Audit and Efficiency program requirements.

Study Provider Contact Name (Please Print)

Estimated Study Start Date

Compressed Air System

Estimated Report Delivery Date

Vectren Representative

Contact Name

Business Name Contact Name

Business Address Contact Phone

City

Federal Tax IDBusiness Name

Business Type Business Classification (choose one)

ZipContact Fax

Compressed Air System Study Application

DateCustomer Signature

Contact Fax

By signing this form I agree that to the best of my knowledge the information contained in this form is correct and representative of the equipment and operations of my facility. I

understand that participation in Vectren Energy Delivery's Conservation Connection Program is voluntary. Submission of this application does not guarantee that the applicant will

receive funding or a specific l evel of funding. Vectren Energy Delivery may conduct a pre- and/or post-inspection t o verify information. I do hereby consent to Vectren Energy Delivery

disclosing my utili ty account number, Federal Tax ID number and consumption data to its subcontractor solely for the purpose of administering this Conservation Connection Program.

I understand that such subcontractors are contractually bound to otherwise maintain my utility account number and Federal Tax ID in the strictest of confidence. By my signature, I

freely give Vectren Energy Delivery of Indiana permission to release the information designated above.

Zip Contact E-mail

Customer Name (Please Print)

1. Read Compressed Air System Study, Study Provider Guidelines.

2. Submit Application for preapproval. All applicable fields must be completed on the form.

3. Premise must be a Vectren commercial/industrial electric customer.

4. Submit complete Program Application by email: [email protected], fax: (608) 829-2723, or mail to: ATTN: Vectren, Marketing &

Contact Title

Contact Phone

Contact E-mail

Mailing Address

City

Qualifications:

Proposed Cost of Study System or Equipment to be studied

$


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IV. Facility Information

Vectren Account Number(s) Affected Meter Number(s)

Facility Address City State

Facility StaffPlease identify key individuals responsible for facility operations and those available to assist with the compressed air study.

Able to assist?(hrs/week)

Describe any currently planned energy efficiency, renovation, or equipment replacement/upgrade projects for the facility.

Are there any scheduling issues that could affect the compressed air study (e.g. major renovations or equipment replacements/upgrades)?

V. System InformationPlease list all air compressors and system components that are currently located at your facility. Add additional pages as needed.

Equipment ID/

Manufacturer HP

Primary or

Back Up

Compressor Type

(e.g. Scroll, Screw,

Reciprocating, Centrifugal)

Capacity Control Mode

(e.g. Load/Unload, VFD, Inlet

Modulation, Blow-off)

Air or Liquid

Cooled

Age

(years)

Annual

Operating

Hours

Equipment ID/

Manufacturer

Primary or

Back Up

Type(Desiccant/Refrigerated,

Cycling/Non-Cycling)

Age

(years)

Size

(Gallons) Wet or Dry

Dryers

Air Compressors

Location

Associated Compressor

(from above)

Storage

Facility Use

Position

Zip

Total Floor Area (ft2

)

Name Facility Responsibilities


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V. System Information ContinuedOutline the major compressed air end use loads, their production hours and required pressure/flow.

Quantity

Pressure Range

(psi)

Flow Operation

(CFM)

What is the system pressure? Do you have trouble maintaining this pressure or have pressure fluctuations at end uses?

Is there air storage near large end use items?

What quality of dry air is needed? Is there a dew point requirement?

What is the highest pressure demand within the compressed air system?

Scheduled Hours and Days of Operation

Air Motors

Air Diaphragm Pumps

Blow Off Applications

End Use Name

Air Pressure Regulators

Air Actuators

Are you willing to optimize your control strategy or usage of compressed air if recommended in the study?

Does the compressed air system trend data (pressure, flow)? If not what trending capabilities will the study provider use?

Describe the compressed air leak management or maintenance schedule at the facility. When was the most recent leak detection survey completed?

Describe the compressed air system operating schedule at the facility.

Is there a management system or manual procedure in place to shut compressors OFF when not in use? If so, is the system is properly tuned?

Describe the compressed air system controls at the facility (cascading with no control, central control system, or manual control).


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Compressed Air System Study Guidelines B-1

Appendix B Calculation & Measurement GuidelinesThe Calculation & Measurement Guidelines are for the use of Study Providers performing a preapproved

Compressed Air System Study through the Custom Audit and Efficiency Program. The goal of this

document is to standardize the calculation methods used by Study Providers and to ensure that thosecalculation methods provide accurate energy and cost savings information to both the program and the

program participants.

A.1 Calculation Guidelines

The following guidelines apply to all calculations presented for the program:

I. Section A.2 details the documentation that is required for compressed air systems in thisprogram.

II. Calculate baseline energy consumption and monthly peak demand of the system beforeestimating energy savings.

III. Use measured data and/or trended data to support both the pre- and post-installation energysavings calculations.

IV. Present calculations in a clear, easy-to-follow format.V. Calculations must be presented in spreadsheet format unless written pre-approval is provided

by Nexant.

VI. Calculations must use industry standard engineering calculation methodologies withsubstantiated input data and not based purely on unfounded estimates.

Weather Data

Any weather sensitive measures will use Typical Meteorological Year 3 (TMY3) data unless prior

approval is given by Nexant. TMY3 data is available for download from the National Renewable Energy

Laboratory: http://rredc.nrel.gov/solar/old_data/nsrdb/1991-2005/tmy3/by_state_and_city.html#I.

Study Providers will use TMY3 data from the weather site nearest in direct distance to the building

under investigation.

Determining Peak Demand Savings

The customers average demand savings is used to determine the monetary impacts on the customers

utility bill. For each measure and for each month of the year, determine demand savings which reduce

the monthly peak demand.

Energy Cost Savings

The Energy Cost Savings is the annual reduction in energy costs through the energy and demand savings

realized by implementing a measure. Assumed estimates or blended rates from staff without approval

for use are not acceptable. It is the Study Providers responsibility to obtain electricity bills from the

Customer, Vectren Account Manager, or Nexant as appropriate.
http://rredc.nrel.gov/solar/old_data/nsrdb/1991-2005/tmy3/by_state_and_city.html#Ihttp://rredc.nrel.gov/solar/old_data/nsrdb/1991-2005/tmy3/by_state_and_city.html#I


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APPENDIX B Calculation & Measurement Guidelines


Please note, in most cases a more detailed analysis of energy cost ($/kWh) and demand costs ($/kW) or

variations of those costs over the course of the year is required. Nexant can assist in this analysis and

the calculation of energy cost savings.

Trending Requirements

Trending of key parameters is required. Section A.2 of this document provides requirements for

trending. The following guidelines apply where trending is required.

I. Trending Period Collect trend data for key parameters covering two weeks during typical operating

conditions.

II. Documentation Provide the program with raw trend data files for records. Note any non-typical operating

conditions included in the trend period such as holidays or facility shut-downs.

III. Trend Interval If using logged data from portable data loggers, use trend interval of 1-minute or less. Data from a control system is also allowed; discuss trending requirements with Nexant.

IV. Power Measurements Accompanying Trends Take three-phase power measurements on equipment when amperage trends are set up.

Use these spot measurements to accurately translate trended amperage to power. The spot

measurements should be of voltage, amps, power factor, and power.

When spot measurements are taken, document date and time of day. Effort should be madeto synchronize a spot measurement with a data point taken from trend interval data.

If possible, take spot measurements at several different loadings of the compressor tocorrelate measured amps with actual power at the different loadings. For example, a load-

unload compressor would be measured at full-load power and at unload power conditions.

Data analysis should then account for variances in power factor and voltage at different

compressor loading.

Air Comp res sor Tr ending Re quiremen ts

All regularly operating compressors must be logged simultaneously regardless of quantity of

compressors. Compressors that are only used for backup purposes if other compressors fail do not have

to be logged, but should be if possible. If logging all operating compressors is not possible, this should

be discussed with Nexant and written approval must be given for alternate approaches.


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A.2 Documentation Requirements for Compressed Air Projects

Table 1 and Table 2 detail the required documentation at the equipment and system level for each stage

of the project for compressed air projects. Data requirements at the equipment level apply to all non-backup equipment.

The information provided below is a minimum; Study Provider will collect all required data to support

energy savings and feasibility of all recommendations. Study Provider may either provide this

information within the report or include the information in the supporting calculation files.

Table 1: Minimum required documentation for compressed air equipment

Compressor Data Requirements

Source Data

Manufacturer spec/nameplate

Compressor type

Manufacturer & model

Motor efficiency

Rated power (bhp)

Rated CFM

Type of Control (modulation, load-unload, VFD, etc.)

Spot measurementVoltageThree phase power measurement (kW) including power factor, voltage, and

amperage. Measurements should be taken at several compressor load

conditions.

Trended data over a minimum

of two weeks

Amperage

Generation pressure

Flow (dynamic compressors only)


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Dryer Data Requirements

Source Data

Manufacturer spec/nameplate

Type (refrigerated, desiccant, regeneration type, control details, etc.)

Rated capacity

Rated power

Spot measurement

Three phase power measurement (kW) including power factor, voltage, and

amperage. Measurements should be taken at several load conditions if

applicable to the type of dryer.

Calculation and or trended data

Dryer power consumption per unit flow (e.g. kW /100 CFM or CFM/kW)

determined from manufacturer specifications (trended and/or measured

data optional).

Compressed Air Storage Data Requirements

Source Data

Manufacturer spec/nameplate Storage volume

Table 2: Minimum required documentation for compressed air systems

System Level Data Requirements

Source Data

Nameplate specs and spot

measurements

Compressed air system efficiency including compressors, dryers, significant

end-uses, etc. Units are generally kW/100 CFM or CFM/kW.

Trended data Compressed air system efficiency including compressors, dryers, etc.

Facility records, site survey

Supply and demand side one-line diagram showing all generation equipment

& significant end uses

Presence of intermediate pressure and/or flow controllers

Measured or observed

System pressure profile of the supply and demand sides noting points of

measurement referenced in the system diagram

Delivery pressure

Documents

Compressed Air Guidelines