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Facility Audit ReportFacility Audit Report of the School District of Winter

February 1, 2016

School District of Winter Facility Audit Report - 2016

3

History 5

Introduction 7

Winter School Executive Summary 11 Facilities Description 11 Energy Savings Analysis 11 Utility Analysis 12 Facility Improvement Measure Savings Summary 13

Facility Improvement Measures 15 FIM 1.1 - Install Variable Speed Drives on 15 Hot Water Pumps FIM 1.2 - Upgrade Unit Ventilators 16 FIM 1.3 - Heating System Upgrade 17 FIM 1.4 - Air Handling Unit Replacement 18 FIM 1.5 - Add Dedicated Cooling System 19 in the Server Room FIM 2.1 - Convert Pneumatic to Digital Controls 20 FIM 2.2 - Recommission Digital Controls 22 FIM 3.1 - Exterior Lighting 23 FIM 3.2 - Lighting Upgrade 24 FIM 4.1 - Window Replacement 25 FIM 4.2 - Replace Ballasted EPDM Roof and 26 add Insulation FIM 4.3 - Door Threshold and Weather 28 Stripping Repair FIM 5.1 - Water Heater Replacement 29 FIM 5.2 - Kitchen Renovation 30 FIM 5.3 - Automatic Flush Valves on Urinals 31

Summary 33

CONTENTS


5

HISTORY

Lockheed Martin (LM) is a global company that leverages the technologies and services of our energy business areas, creating a unique set of skills that help us solve our customers’ toughest energy challenges. LM is a Department of Energy certified Super Energy Savings

Performance Contractor (Super ESPC) as well as an active member of the National Association of Energy Service Companies (NAESCO).

LM has more than 20 years of program implementation experience, including delivering solutions in the areas of sustainability, energy efficiency, smart energy management, alternative power generation, and climate monitoring. The LM Energy division has more than 400 energy professionals, including 72 degreed engineers, 38 MBAs, and 5 PhDs standing ready to support our contract performance.

In 2015, Lockheed Martin partnered with CESA 10, a nonprofit educational service agency providing facilities management services to school district and government customers throughout the state. CESA’s knowledge of local markets and school/government systems, paired with LM’s unequaled expertise, resources, and capabilities ensures our team is the best solution for your district. We pride ourselves in understanding and delivering state-of-the-art green building technologies.

Lockheed Martin and CESA (LM/CESA Team) will ensure that your project meets all of the requirements of WI §§ 66.0133 and 121.91, as well as PI 15 and Emergency Rule PI 15. We are excited about what this partnership will provide your project. Together, the LM/CESA Team shares a commitment to customer empowerment through customer-protective processes and customer-oriented solutions.


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INTRODUCTION

At the request of the District, the LM/CESA Team had technical experts perform a detailed on-site audit of the building in the Winter School District. The recommendations in this report have the goal of improving failing and inefficient equipment in the building and reducing energy

consumption to ensure any taxpayer investment is managed within an appropriate payback period.

Winter School District has done an effective job at utilizing the existing equipment in the buildings to the best of their working ability. Some equipment is reaching, or past, the end of its life, and should be planned for replacement to ensure the equipment does not fail when the school is counting on it to create a safe and comfortable environment for students and staff to learn and teach.

Common themes throughout the building audited include needed improvements and opportunities in HVAC systems, lighting, and building envelope concerns. Water consumption was addressed along with kitchen spaces, to include systems that contribute to the utility usage of the facility.

Although the District has used and managed the existing equipment effectively to meet the needs of the schools, improvements are going to be needed in the near future. The District can utilize this report as a guide to identify the highest priority facility improvement measures (FIMS) during capital planning.

The recommendations included in this report for each school are meant to assist the District over the next several years in conserving energy, reducing operating and maintenance costs, and improving occupant comfort and safety where applicable.

If the facility improvement measures listed in this report are implemented, the District could save over $39,303 per year in energy, operation and maintenance costs.


9

School Districtof Winter


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FACILITIES DESCRIPTION

Winter School, located at 6585 West Grove Street, Winter, Wisconsin, was built in 1975 with a major renovation in 1997.

The facility improvement measures (FIMs) proposed encompass many systems including envelope, heating system, building automation, and lighting. The upgrades proposed in the following report will save the school energy and have the additional benefit of reducing labor, operation and future maintenance costs, while improving occupant comfort.

By completing the FIMs detailed in the following report, Winter School will save an estimated $39,303 per year in energy, operation and maintenance costs.

ENERGY ANALYSIS

The following LM/CESA Team benchmarking analysis compares Winter School to an average K-12 school in Wisconsin. Winter School percentage ranking is higher (better) than the average K-12 school in electric usage and gas usage. The low utility usage is due to better than

average equipment that is being well maintained and operated.

EXECUTIVE SUMMARY

Winter School Square Footage 120,000 2014-2015 Electric Usage (kWh) 498,870 2014-2015 LP Usage (Gallons) 48,021

Winter School Benchmarking

Average K-12 Schools: 91.9 7.6 7.2 $1.61

Winter School: 51.8 4.2 4.0 $0.93

Ranking % Among WI Schools: 91% 90% 92% 90%

Total Energy Cost

$/ft²

Electric Use

kWh/ft²

LP GasUse

Btu/ft²/HDD

Total Energy Use

kBtu/ft²


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UTILITY ANALYSIS

The utility graph below demonstrates the electrical consumption at Winter School in 2015. There is a minimal amount of mechanical cooling at the Winter School. Because there is very little cooling, the electrical usage is much lower in the summer months. The electrical usage

is variable in the months when school is in session. The variable usage may be a result of active scheduling of equipment when events and vacations take place.

The Winter School is heating using liquid propane (LP). Winter has an 18,000 gallon tank and consumes approximately 40,000 gallons per year. Usage for LP is more difficult to graph than natural gas usage, which is metered monthly, due to variability of when deliveries are made. Consumption according to delivery reports for 2015 follows a typical profile for a building heated with natural gas and exposed to Wisconsin weather patterns. The exceptionally low usage compared to other schools would indicate that the equipment is being operated efficiently.


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FACILITY IMPROVEMENT MEASURES SUMMARY

Facility Improvement Measure (FIMs)

No. kWh kW $ Gallons $ CCF $1 302,250$ 12,179 0 1,181$ - -$ 1,181$ - -$ 6,075$ 41.7

1.1 VSDs 9,750$ 8,082 - 784$ - -$ 784$ - -$ -$ 12.41.2 Unit Ventilators 292,500$ 4,097 0.2 397$ - -$ 397$ - -$ 6,075$ 45.2

2 234,000$ 4,989 - 484$ 1,484 1,959$ 2,443$ - -$ 5,063$ 31.22.1 Pnuematic to Digital Controls - HS 234,000$ 4,989 - 484$ 1,484 1,959$ 2,443$ - -$ 5,063$ 31.2

3 -$ - - -$ - -$ -$ - -$ -$ -4 39,000$ - - -$ 119 157$ 157$ - -$ 2,000$ 18.1

4.1 Windows 39,000$ - - -$ 119 157$ 157$ - -$ 2,000$ 18.15 -$ - - -$ - -$ -$ - -$ -$ -

575,250$ 17,168 0 1,665$ 1,603 2,117$ 3,782$ - -$ 13,138$ 34.0115,050$

25,000$ 715,300$

No. kWh kW $ Gallons $ CCF $1 201,500$ 5,225 2 625$ 1,226 1,618$ 2,243$ - -$ 4,050$ 32.0

1.3 New Boiler 91,000$ - - -$ 1,226 1,618$ 1,618$ - -$ 2,025$ 25.01.4 Shop/Welding Air Handling Unit 97,500$ 4,405 0.05 427$ - -$ 427$ - -$ 2,025$ 39.81.5 Server Room Cooling 13,000$ 820 1.6 198$ - -$ 198$ - -$ -$ 65.8

2 45,500$ 2,993 - 290$ 990 1,306$ 1,597$ - -$ 4,050$ 8.12.2 Recommissioning 45,500$ 2,993 - 290$ 990 1,306$ 1,597$ - -$ 4,050$ 8.1

3 27,625$ 10,880 3 1,055$ - -$ 1,055$ - -$ 632$ 16.43.1 Exterior Lighting 13,000$ 3,008 - 292$ - -$ 292$ - -$ 97$ 33.53.2 Interior Lighting 14,625$ 7,872 3 764$ - -$ 764$ - -$ 536$ 11.3

4 533,000$ - - -$ 1,632 2,154$ 2,154$ - -$ 5,250$ 72.04.2 Roofing 520,000$ - - -$ 1,274 1,682$ 1,682$ - -$ 5,000$ 77.84.3 Doors 13,000$ - - -$ 358 472$ 472$ - -$ 250$ 18.0

5 50,700$ - - -$ 494 652$ 652$ 66 1,073$ 700$ 20.95.1 DWH 15,600$ - - -$ 101 133$ 133$ - -$ 100$ 66.95.2 Kitchen Equipment 26,000$ - - -$ 393 519$ 519$ - -$ 500$ 25.55.3 Urinal Valves 9,100$ - - -$ - -$ -$ 66 1,073$ 100$ 7.8

858,325$ 19,098 5 1,971$ 4,341 5,731$ 7,701$ - -$ 14,682$ 38.3171,665$

30,000$ 1,059,990$

* The contingency funds will be used at the sole discretion of the Project Manager to implement the Priority FIMs as selected by the district

Mechanical Measures

Alternate FIMs Savings Summary: Winter School District Simple

Payback (Years)

*The red/yellow/green indicates the likelihood of the project running into environmental hazards and associated abatement costs with red being the highest likelihood and associated cost and green the lowest. The colors in the chart are based on CESA 10’s experience with environmental hazards and a visual inspection only. Since environmental hazards are often hidden and/or found in layers, costs are not estimated in this report. Costs will be estimated upon FIM selection and actual testing for hazards.

DescriptionBudget Cost

$

Electricity Liquid PropaneTotal Energy Savings $

Water Savings Total Maintenance

Savings $

Facility Improvement Measure (FIMs)

Lighting Measures

HVAC Control Measures

Building Envelope Measures

Miscellaneous Measures

Priority FIMs Savings Summary: Winter School District

Total Energy Savings $Description

Total Maintenance

Savings $Mechanical Measures

Water SavingsElectricity Liquid Propane Simple Payback (Years)

Budget Cost $

*Environ. Hazard Mngmnt

Contingency (20%)Evironmental Hazard Contingency $15,000-

$55,000 based in FIMs selected

Total

Total Estimated Contract Cost

HVAC Control Measures

Lighting Measures

Building Envelope Measures

Miscellaneous Measures

Total

*The red/yellow/green indicates the likelihood of the project running into environmental hazards and associated abatement costs with red being the highest likelihood and associated cost and green the lowest. The colors in the chart are based on CESA 10’s experience with environmental hazards and a visual inspection only. Since environmental hazards are often hidden and/or found in layers, costs are not estimated in this report. Costs will be estimated upon FIM selection and actual testing for hazards.

Contingency (20%)Evironmental Hazard Contingency $15,000-

$55,000 based in FIMs selectedTotal Estimated Alternate FIM Cost


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FIM 1.1- Install Variable Speed

Drives on Hot Water Pumps

EXISTING

The current pumping system is delivering a continuous amount of water through the building at a constant water supply temperature. This system pumps water throughout the building during the heating season, 24 hours a day, to ensure the rooms do not drop below the required “freeze protection” temperature and so the system can heat back up in the morning. The lack of control on this system significantly reduces the efficiency.

FACILITY IMPROVEMENT MEASURES

RECOMMENDATION

Each pump motor should be controlled with a variable speed drive. Variable speed drives (VSDs) installed on the pump motors will reduce the energy used to pump hot water around the building by slowing down the motor when the demand for hot water flow is less than the maximum amount. The variable speed drives will be controlled based on a differential temperature or pressure sensor. As the differential temperature or pressure set-point is being met, the drive will slow the motor speed saving considerable electrical energy.

Additional benefits of installing VSDs may include less motor wear, fewer start-stop cycles, less noise, and soft start capability. As VSDs adjust the supply of water to match the actual load, it may also reduce wear on the motors and eliminate water hammer in systems that are susceptible to it.

FIM 1 - Mechanical Measures

SCOPE OF WORK

• Add variable speed drives to the hot water pump loop.

Estimated Annual SavingsEnergy Savings: $784Operation & Maintenance Savings: $0


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FIM 1.2 - Upgrade Unit Ventilators

EXISTING

Building ventilation is provided to the classrooms by unit ventilators. Existing unit ventilators bring in outside air with 1/3 horsepower (hp) motors. These motors are also original to the building and operate at a low efficiency compared to NEMA premium motors.

The existing unit ventilators are not able to vary speed or change the amount of outside air coming into the system by changing the damper position. The existing valves on these older units may have been stuck open or may not be functioning as originally designed.

RECOMMENDATION

Replace existing unit ventilators with new upgraded units. These units will have NEMA premium motors to upgrade efficiency of air delivery. Also consider using electrically commutated motors (ECMs) to deliver air. ECMs are available on new unit vents and should be considered for comfort and energy efficiency. ECMs are single-phase direct drive motors. These motors are variable speed with the electronic controller in or on the motor. These types of motors are only available on small motors up to 3 horsepower. The incremental cost of ECMs versus a standard fractional horsepower NEMA premium motor is small and should be considered for additional energy savings.

The new unit ventilators will have operational dampers to control the amount of outside air and return air being brought into the space. They will be controlled by the digital control system and operated with energy efficient sequences of operations through the control system to maximize efficiency.

SCOPE OF WORK

• Replace the existing unit ventilators with new efficient unit ventilators with ECM motors to increase efficiency.

Estimated Annual SavingsEnergy Savings: $397Operation & Maintenance Savings: $6,075


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FIM 1.3 - Heating System Upgrade

EXISTING

The existing boiler plant consists of five Aerco KC1000 units and is controlled by an Aerco boiler management system. These boilers are efficient, but have been heating the school for nearly 20 years. A number of different issues have come up that needed repair in the past, and the expected end of useful life of the boilers is approaching. After operating for nearly 20 years, the boilers are less efficient than new boilers due to buildup of scale on the heat exchangers.

RECOMMENDATION

It is our recommendation that a new condensing boiler be installed that will replace two of the existing boilers. Replacing two of the existing units will raise efficiencies and reduce the probability of expensive repairs on the existing boilers.

SCOPE OF WORK

• Remove the two most problematic of the existing boilers.• Install a new condensing boiler that will replace the load of the boilers that were removed.

Estimated Annual SavingsEnergy Savings: $1,618Operation & Maintenance Savings: $2,025


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FIM 1.4 - Air Handling Unit Replacement

EXISTING

Several of the existing air handling units currently utilize constant volume fans and are original to the building. Older constant volume air handlers like the ones that were observed in the audit are inefficient compared to new units and variable speed drive fans.

The one unit in worse condition was in the shop/welding area. This unit may not be bringing in the proper amount of ventilation air for the space.

RECOMMENDATION

Replace the existing air handlers with more energy efficient units. Incorporating new coils, new fans, and variable speed drives will improve indoor air quality as well.

SCOPE OF WORK

• Replace the existing air handling units with new air handlers.• Test and balance the air handlers to make sure ventilation is sufficient for the unique space.



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FIM 1.5 - Add Dedicated Cooling

System in the Server Room

EXISTING

The existing server room was not designed to have a high concentration of electronic equipment located there. For this reason, the room was not set up with any dedicated cooling equipment that was designed for cooling a space with electronic equipment. Currently, the ceiling tiles are left off, the door is left open, and the air handling equipment that serves the space is kept running to move air through the space. This arrangement causes concerns for the longevity of the equipment, the security of the servers, and the increased energy use caused by not having a unit that only cools this space.

RECOMMENDATION

Install a dedicated cooling unit for the server room. Once this is installed, the room can be locked and the equipment will run more efficiently with better reliability and security.

SCOPE OF WORK

• Install an air conditioning system specifically designed for server room environments.



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FIM 2.1 - Convert Pneumatic to Digital Controls

EXISTING

The existing HVAC control system consists of a mix of digital controls and pneumatic controls. The pneumatic controls are problematic as described below, and the compressed air system that runs the pneumatic devices is costly to maintain.

Pneumatic controls are inherently less precise and less efficient due to compressed air operating actuators. The practice of taking electrical energy, converting it to compressed air, filtering,

and transporting it is inherently inefficient when taking into account energy conversion, compression and friction losses. When the compressed air reaches an actuator, it is released into an actuator cylinder and forces the piston to a specific position. The accuracy of this type of actuator is inherently less when compared to a digital signal, especially in old, degrading control equipment.

An additional disadvantage to pneumatic controls is the possibility of leaks in the systems – either at the actuators or throughout the compressed air lines. If there is continuous compressor cycling, then there is likely a system leak which can be difficult to identify, especially with buried pneumatic lines. Below are two pictures of pneumatic control cabinets. The cabinet on the right has been stripped of most of its control components and isn’t functional.

Another issue is manual time clocks. Manual time clocks rely on operation staff. These systems are on/off and start either on the flip of a switch or a set schedule. On snow days or other non-occupied days, the system would have to be switched off or have a manual override to put equipment in unoccupied modes, or else it runs in fully occupied mode, which is very inefficient.

FIM 2 - HVAC Control Measures


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RECOMMENDATION

Replace existing HVAC controls with a complete direct digital control (DDC) system that allows monitoring and adjustment by the operator, even when the operator is off-site. The controls in the newer section of the building could also be upgraded so they will interface with the new control system.

DDC systems increase efficiency over pneumatic systems because DDC sends an electronic signal over wire to control equipment. This upgrade eliminates the inefficiencies seen with pneumatic controls, because it eliminates the energy conversion (electric to compressed air), eliminates leaks, eliminates the need for a compressor, and uses more refined controls when the system makes a “request.” The digital system will analyze the inputs and use control logic to adjust the output signal (ex: proportional integral control or proportional integral derivative) for increased precision.

Detailed specifications and high quality installation of the new controls will be critical to realizing savings estimates. The installation of DDC is dependent on the amount of control the operator has to customize the system. It is important to note that if the existing system is functioning at minimum code settings and the DDC system helps make the building more comfortable and code compliant, there is a possibility that the DDC system could cause equipment to run more often – possibly increasing energy use. The LM/CESA Team has experts on staff that can verify the DDC system is set up correctly and will function optimally to ensure comfort and code compliance along with maximizing the efficiency of the entire system.

Items that will be detailed in the specifications include:

• Optimized control sequences • A detailed description of control points will be adjustable and displayed on graphics pages • A detailed description of training will be provided to the District • A listing of points that will be trended, set up, and available to the District • Equipment alarm parameters and protocol

SCOPE OF WORK

• Remove all pneumatic thermostats, control panels, and actuators.• Remove air compressor.• Install thermostats, control panels, and actuators that are compatible with digital controls.• Program energy efficient sequences to operate system efficiently.



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FIM 2.2 - Recommission Digital Controls

RECOMMENDATION

Have the digital controls recommissioned to optimize the existing controls in place.

The LM/CESA Team has experts on staff that can verify that the DDC system is operating correctly, will function optimally to ensure comfort and code compliance, and will maximize the efficiency of the entire system.

EXISTING

There are a couple areas that have Johnson Metasys digital controls, but are not using the digital control system to the maximum capacity. Several of the sequences that the controls use as commands to the equipment have been described by the operator as “buggy” or inoperative.

There are likely a number of areas that can be optimized with a thorough investigation of the digital controls system.

SCOPE OF WORK

• Recommission existing digital controls system.• Program energy efficient sequences to operate the system efficiently.

Estimated Annual SavingsEnergy Savings: $2,300Operation & Maintenance Savings: $665


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FIM 3.1 - Exterior Lighting

RECOMMENDATION

Replace the HID lighting on the exterior of the building with light emitting diode (LED) fixtures.

High intensity discharge (HID) lighting has been the standard for exterior lighting applications for many years. Examples of HID lighting include high pressure sodium (HPS), mercury vapor, and metal halide. HID lighting produces light by creating an arc over two electrodes through a gas medium contained in a pressurized glass bulb, hence the name “high pressure or high intensity.” Depending on the gas, the color rendering of the fixture can be “cool” – glowing blue/green as in mercury vapor lamps, or “warm” as in the white/yellow color from metal halide lamps. These sources also have significant lumen depreciation providing less light output throughout their lifetime.

Replacing these fixtures will reduce fixture wattage by almost 75%, and extend the lifetime of the lamp from 10,000 hours for a new HID fixture to 50,000 for a new LED fixture. This significantly reduces maintenance cost (labor) for lamp replacement. In addition, lumen depreciation is greatly reduced when compared to HID lighting. This means the light will stay brighter longer.

LED lighting also has improved color rendering. An LED fixture will more accurately represent the colors of the object being lit and will not “shift” colors at the end of life like the typical HID lighting system.

FIM 3 - Lighting Measures

EXISTING

Existing exterior lights consist of high intensity discharge (HID) wall packs and pole mounted HID.

SCOPE OF WORK

• Replace the HID fixtures with LED wall packs.



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FIM 3.2 - Lighting Upgrade

EXISTING

Most of the interior lighting consists of T8 fixtures with standard electronic ballasts and 32 watt lamps. The fixtures in the newer areas are predominantly 2’ x 4’ fixtures utilizing two lamps in the classrooms and hallways depending on the fixture.

The lighting in the auditorium consists of 2’ x 2’ troffers with U-tube bulbs. These bulbs are expensive and have a short life compared with new technologies.

RECOMMENDATION

Upgrade lighting fixtures in the auditorium and possibly the hallways as well. Auditorium lighting should be replaced with more energy efficient LED 2’ x 2’ troffers and similar LED technology on stage. The hallway areas could also be upgraded with LED 2’ x 4’ fixtures. The hallway areas have the lighting fixtures turned on the longest and will therefore have the quickest paybacks.

LED fixtures can be sized to give the proper light output and can save more energy by adjusting the wattage of the fixture to the space where it’s located.

Footcandles for typical school areas are as follows:

SCOPE OF WORK

• Replace outdated and inefficient fixtures with high efficiency LED fixtures.


Winter School has done a good job of trying to match the lighting level in the school to IESNA recommended light levels by doing things like delamping when possible. Winter will save energy by installing LEDs, but not as much as they would in schools where these types of measures haven’t been implemented.


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FIM 4.1 - Window Replacement

EXISTING

Most of the windows in the school are in acceptable condition and should be left as is. There are 14 windows in this facility that are in poor condition and should be replaced. These windows are 4’ x 4’ Weathershield Thermopanes that are located in the older section of the building.

RECOMMENDATION

Replace windows with modern high efficiency models. This will reduce energy costs in two ways: 1) the reduced U-value will reduce conductive heat transfer, and 2) newly installed windows will “seal” much better and reduce the amount of infiltration of outside air.

High performance thermal windows will significantly reduce any infiltration along with decreasing the U-value of the window to 0.56. Double and triple pane windows increase insulation value by not only adding additional material with insulating properties, but adding an air gap to increase the insulation value.

Additionally, windows with low visual transmittance reduce summer solar heat gain and aid with facility daylighting. Low transmittance windows reduce the contrast between the “bright” outside and darker inside of the building. The low contrast difference keeps people from pulling blinds to block bright light entering the building. Low transmittance in the lower panes of glass and high transmittance in the upper panes of glass combined with shades for the lower panes of glass can help significantly with daylighting.

SCOPE OF WORK

• Install new high performance thermal windows (U-0.56).• Install double pane windows with low-E glass treatment.


FIM 4 - Building Envelope Measures


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FIM 4.2 - Replace Ballasted EPDM and Add

Insulation

decking (typically wood or steel), a layer of insulation (poly-isocyanurate is common) a mechanically attached roof board, the EPDM layer, and then a layer of 1 ½” to 2” rocks (ballast) covering the entire area. While this is a very durable and waterproof system, it can be very expensive to “troubleshoot” and maintain when it reaches end of life.

A significant amount of educational building energy loss occurs through the roof. The roof should be inspected annually for obvious indications of damage, especially around edges and all roof penetrations. When it is time to upgrade the roof, an inexpensive opportunity for energy improvement exists with the addition of insulation. A roofing supplier can provide a low-cost/no-cost condition report of a current roofing system. From this report, the amount of existing insulation and the current building materials can be determined.

EXISTING

The majority of the roof at Winter School was installed in around 20 years ago and consists of a ballasted ethylene propylene diene monomer (EPDM) roof with a moderate amount of insulation. The warranty has expired for the roof and any repairs that need to take place after this time will be paid for in full by the District.

A ballasted EPDM roof consists of an underlayment of roof


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SCOPE OF WORK

• Remove existing EPDM roof and existing insulation.• Insulation: 4” of polysiocyanurate (two layers of 2”).• Two-ply atactic polypropylene (APP) roof membrane system, adhered and heat welded.• All insulation layers adhered.• New flashing system installed.


RECOMMENDATION

As roofing materials reach the end of life and a new roofing system is being considered, it is highly recommended to add insulation as the opportunity presents itself. While installing a new roof to keep the building water tight, additional insulation will help to keep the building warmer in the winter and cooler in the summer. For this project, it is recommended to add a significant amount of insulation bringing the total R-value to R-35.

The District should also consider a white or reflective surface for the roofing to avoid comfort issues in the building since there is very little mechanical cooling. It should be noted that switching to a white roof at the Winter School would be considerably more expensive, since it requires a different type of roofing system. Most of the current roof is ballasted, which means it is covered in rock. A white roof would need to be fully adhered, which means it would be held in place by mechanical fasteners. The difference in cost would likely be around twice as much as going with the existing roofing system, should the district choose that option.


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FIM 4.3 - Door Threshold and Weather Stripping

Repair

RECOMMENDATION

Install new seals on the thresholds of each door that has a visible gap or where the existing seals are worn or damaged. This facility improvement measure will reduce the amount of outside unconditioned air that is allowed into the facility and will reduce the heating load of the building. The resulting system with a weather-tight building ensures that all outside air is controlled which is crucial in times of extreme hot or cold weather.

SCOPE OF WORK

• Install new seals on and around doors that are leaking or damaged.


EXISTING

Some doors have poor seals around their perimeter and thresholds. The doors that have the biggest potential for poor seals are the garage doors where the maintenance equipment is stored. In this area, the concrete flooring doesn’t match up with the bottom seal of the door and there is a gap that causes a variety of issues as a result.

Doors with a significant air gap between the bottom of the door and the threshold pose both an energy concern along with a safety concern. Non-weatherstripped doors make the building use more energy as they allow unconditioned air into the building.

For example, during heating months – when cold outside air is allowed into the building through an air gap, the temperature of the space reduces as it mixes cold outside air with heated air. This makes the heating system and heat distribution system work harder than it would normally as the thermostat is reading a colder temperature and the return air to the boiler is also colder.


29

FIM 5.1 - Water Heater Replacement

EXISTING

The domestic water heater in the mechanical room is in good to fair condition, but it has a 65% efficiency rating. The unit is inefficient because it is a model that uses an atmospheric burner rather than a high efficiency sealed combustion, condensing model. New condensing style water heaters are rated in excess of 90% efficiency, and will offer extended life as compared to the older style water heaters.

RECOMMENDATION

Replace the existing water heater with a new, efficient water heater. Replacing the water heater will lower the future maintenance expense and increase reliability.

New water heaters are also more energy efficient than the existing model. A high efficiency sealed combustion unit should be selected. The timer on the domestic water circulation pump that is currently installed should remain in place to maximize the savings.

SCOPE OF WORK

• Remove the existing water heater and install new, high efficiency water heater.• Venting for the new water heater will need to be investigated to make sure this doesn’t balloon the cost.


FIM 5 - Miscellaneous Measures


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FIM 5.2 - Kitchen Renovation

EXISTING

One of the existing stoves is nearing the end of its predicted useful life, and the other stove is well past it. The District has done a great job of maintaining the equipment, but the repair expenses will undoubtedly start adding up. Both stoves have a standing pilot light, which means that a small amount of gas is constantly burning. This is inefficient when compared with stoves that ignite without the need for a standing pilot light.

RECOMMENDATION

Replace the stoves with more energy efficient models and evaluate the exhaust hood system to make sure it meets regulations.

SCOPE OF WORK

• Update the kitchen equipment and fixtures, starting with the stoves.



31

FIM 5.3 - Automatic Flush

Valves on Urinals

EXISTING

Many older buildings still use automatic flush valves on the urinals. This valve typically flushes at a set (timed) interval during occupancy. When the timer hits the preset time, all of the urinals flush, even though only one or maybe none of them has been used since the last flush. This is a built-in water waster and should be corrected as soon as possible.

RECOMMENDATION

Install automatic flush valves at each urinal that flush immediately after each use. The water use after installation of these valves will be a small percentage of what it was prior to the installation.

SCOPE OF WORK

• Remove old fill tank and repair wall.• Install automatic flush valves at each urinal that is currently utilizing the “fill and flush” system.• Adjust sensors to ensure proper function.

Estimated Annual SavingsWater Savings: $1,073Operation & Maintenance Savings: $100


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SUMMARY

The LM/CESA Team audited the Winter School District facilities and district energy use in January of 2016. The educational facilities are well maintained, and District leadership and facilities staff should be commended on how the schools are being run, maintained, and

managed.

The recommendations included in this report for the K-12 school are meant to assist the District over several years in conserving energy, reducing operating and maintenance costs, and improving occupant comfort and safety where applicable.

Any questions about this report can be directed to Tad Beeksma at 715-720-2178.

Documents

Facility Audit Report - winter.k12.wi.us Energy Audit Report.pdf · Facility Audit Report ... will ensure that your project meets all of the ... School District o Winter Facility