Chiller Estimator 3.0

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BetterBricks Simple Calculator - CHILLER TOTAL COST OF OWNERSHIP ESTIMATOR 3.0

Chiller Evaluated: 575 ton Carrier 23XRV tripple rotor variable speed

Net Present Value of Total Cost of Ownership = $ - for

Minimum Required Tons = 575 at 44 Degrees F. Leaving Evaporator Water Temperature (LEWT)Operating Tons* = 575 575 518 460 403

85

80

75

70

65

60

55

575 Total Chiller Tons @ 85 degree F. ECWT and

Condenser Design GPM and Pressure Drop 1800 GPM

Evaporator Design GPM and Pressure Drop 789 GPM

Bid Price of Chiller = Include variations in installation costs, package pricing, etc.Utility Incentive = This is often the incremental cost difference between a code compliant chiller and a more efficient and expensive chiller.

Net Chiller Cost = $ - This may equal the cost of the least expensive code compliant chiller.

Bid Price of Full Maintenance Contract = Contract Duration =Annual Hours of Operation = -

Annual Chiller KWH = - Ballpark Annual Pumping KWH = - GPM x Ft Head x (.746/.92) x Annual Hrs x

Cost of Electricity per KWH = $ 0.060 Annual Chiller Electric Costs = $ -

Ballpark Annual Pumping Electric Costs = $ - Total Annual Electric Cost = $ -

Annual O&M Cost = $ - Full Maintenance Contract price divided by number of years.Total First Year Operating Costs = $ - Annual Electricity Inflation Rate = 3% Reasonable default might be 3%

Annual O&M Inflation Rate = 6% Reasonable default might be 6%Discount Rate = 6% Reasonable default might be 4% to 6%

Anticipated Years of Chiller Use = 25 Total Costs of Ownership (TCO) will be evaluated over this period of time.

CHILLER LOAD PROFILE

Entering Condenser

Water Temperature

(ECWT)°F

Building Condenser Water Pressure Drop @ Design GPM not including condenser pressure drop

Building Chilled Water Pressure Drop @ Design GPM not including evaporator pressure drop

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Chiller entering condenser water temperature (ECWT) reset: Traditional thinking has been to maintain an ECWT of perhaps 85 degrees. In reality, a chiller will operate more efficiently if the ECWT is as low as the chiller manufacturer recommends. Many fixed speed chillers can work fine with an ECWT of around 67 and variable speed chillers can operate with a much lower ECWT. Please note that it takes more fan energy to produce the coldest possible condenser water temperature. Do some calculations to make sure you are not using more fan energy than you are saving in chiller energy. This can be particularly important with forced draft cooling towers (squirrel cage fans at the bottom of the cooling tower). Please keep in mind that when it is 90 degrees outside, the cooling tower may not be able to produce less that an 85 ECWTbut on a colder day with lower chiller loads, it may be possible to achieve a 60 degree ECWTor less. In the Puget sound area, you may find that our recommended default temperatures serve well but in drier climates with relatively cold nights you may run your lowest ECWT below 50.

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The lowest TCO chiller may be a variable speed chiller that is larger than the minimum required tons. Try selecting a VS chiller that is around 20% larger than the minimum requirement. There may also be a "sweet spot" that is different for each manufacturer.

Tons 575 518 460 403 345 288 KWH/YR 0 0 0 0 0 0 Hours/YRKW/tonECWT at Load 75 75 70 70 65 65

85 80 75 70 70 70


575 ton Carrier 23XRV tripple rotor variable speed

25 years

Degrees F. Leaving Evaporator Water Temperature (LEWT)

345 288 230 173 115

44 degree F. LEWT

at 24.4 Ft of Head

at 8.0 Ft of Head

Ft of Head

Ft of Head

Include variations in installation costs, package pricing, etc.This is often the incremental cost difference between a code compliant chiller and a more efficient and expensive chiller.

This may equal the cost of the least expensive code compliant chiller.

Contract Duration = 7.0 years Pick a long enough contract duration to include all major sechduled maintenance.

GPM x Ft Head x (.746/.92) x Annual Hrs x 0.000308 equals full speed KWH/Yr

Full Maintenance Contract price divided by number of years.

Reasonable default might be 3%Reasonable default might be 6%Reasonable default might be 4% to 6%Total Costs of Ownership (TCO) will be evaluated over this period of time.

CHILLER LOAD PROFILE

not including condenser pressure drop Building Pumping energy can be added to your calculations but it is not necessary for selecting a chiller. This would be a good place to compare piping and control variables.

not including evaporator pressure drop

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Adding values into the condenser, evaporator and building pressure drop cells will yield a ballpark energy consumption based on fixed speed pumps. Variable speed condenser water pumps may not be as cost effective if the piping system is short and simple. You can fool the calculator into providing variable pump speed energy costs by reducing the Ft of Head values by as much as 50%.

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Adding values into the condenser, evaporator and building pressure drop cells will yield a ballpark energy consumption based on fixed speed pumps. Variable speed chilled water pumps are almost always cost effective. You can fool the calculator into providing variable pump speed energy costs by reducing the Ft of Head values by at least 50%.

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230 173 115 100% to 20% in 10% increments0 0 0

65 65 65

70 65 60

Approximate ECWT (condenser water temperatures entering the chiller) in 5˚ increments.

Default Condenser Temperature Value Suggestions which you may choose to provide to vendors to help them select an offering. These numbers might work in the Puget Sound area but can vary dramatically depending on your humidity levels.

System designer will provide information for YELLOW cells.

This is often the incremental cost difference between a code compliant chiller and a more efficient and expensive chiller.

Pick a long enough contract duration to include all major sechduled maintenance.

Chiller vendor will provide information for BLUE cells. Use ARI certified KW/ton values in each of the BLUE cells to the right. Vendor will also provide total

chiller tons and heat exchanger pressure drops at design GPM.

Building Pumping energy can be added to your calculations but it is not necessary for selecting a chiller. This would be a good place to compare piping and control variables.

100% to 20% in 10% increments


Default Condenser Temperature Value Suggestions which you may choose to provide to vendors to help them select an offering. These numbers might work in the Puget Sound area but can vary dramatically depending on your


Chiller Evaluated: 600 ton Carrier 19XRV Variable Speed Centrifugal Chiller

Present Value of Total Cost of Ownership = $ - for 25 years

Minimum Required Tons = 600 at 42 Degrees F. Leaving Evaporator Water Temperature (LEWT)Operating Tons* = 600 600 540 480 420 360 300 240 180 120 System designer will provide information for YELLOW cells.

85

80

75

70

65

60

55

600 Total Chiller Tons @ 85 degree F. ECWT and 42 degree F. LEWT

Condenser Design GPM and Pressure Drop 1800 GPM at 24.4 Ft of Head

Evaporator Design GPM and Pressure Drop 789 GPM at 8.0 Ft of Head

Ft of Head

Ft of Head

Bid Price of Chiller = Include variations in installation costs, package pricing, etc.Utility Incentive = $ - This is often the incremental cost difference between a code compliant chiller and a more efficient and expensive chiller.


Bid Price of Full Maintenance Contract = Contract Duration = 7.0 years Pick a long enough contract duration to include all major sechduled maintenance.Annual Hours of Operation = -

Annual Chiller KWH = - Ballpark Annual Pumping KWH = - GPM x Ft Head x (.746/.92) x Annual Hrs x 0.000308 equals full speed KWH/Yr

Cost of Electricity per KWH = $ 0.060 From Input 1 worksheetAnnual Chiller Electric Costs = $ -


Annual O&M Cost = $ - Typically maintenance cost but could be fuel savings (as negative value), etc.Total First Year Operating Costs = $ - Annual Electricity Inflation Rate = 3% From "Input 1" worksheet

Annual O&M Inflation Rate = 6% From "Input 1" worksheetDiscount Rate = 6% From "Input 1" worksheet

Anticipated Years of Chiller Use = 25 From "Input 1" worksheet

CHILLER LOAD PROFILETons 600 540 480 420 360 300 240 180 120 100% to 20% in 10% incrementsKWH/YR 0 0 0 0 0 0 0 0 0 Hours/YR 0 0 0 0 0 0 0 0 0 KW/tonECWT at Load 75 75 70 70 65 65 65 65 65

85 80 75 70 70 70 70 65 60

Entering Condenser

Water Temperature

(ECWT)°F



Building Condenser Water Pressure Drop @ Design GPM not including condenser pressure drop Building Pumping energy can be added to your calculations but it is not necessary for selecting a chiller. This would be a good place to compare piping and control variables.Building Chilled Water Pressure Drop @ Design GPM not including evaporator pressure drop


Default Condenser Temperature Value Suggestions which you may choose to provide to vendors to help them select an offering. These numbers might work in the Puget Sound area but can vary dramatically depending on your temperature and humidity levels.

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Chiller Evaluated: 600 Ton York Variable Speed Centrifugal

Present Value of Total Cost of Ownership = $ - for 25

Minimum Required Tons = 600 at 44 Degrees F. Leaving Evaporator Water Temperature (LEWT)Operating Tons* = 600 600 540 480 420 360

85

80

75

70

65

60

55

600 Total Chiller Tons @ 85 degree F. ECWT and

Condenser Design GPM and Pressure Drop 1800 GPM at

Evaporator Design GPM and Pressure Drop 789 GPM at

Bid Price of Chiller = Include variations in installation costs, package pricing, etc.Utility Incentive = This is often the incremental cost difference between a code compliant chiller and a more efficient and expensive chiller.


Bid Price of Full Maintenance Contract = Contract Duration =Annual Hours of Operation = -

Annual Chiller KWH = - Ballpark Annual Pumping KWH = - GPM x Ft Head x (.746/.92) x Annual Hrs x

Cost of Electricity per KWH = $ 0.060 From Input 1 worksheetAnnual Chiller Electric Costs = $ -


Annual O&M Cost = $ - Typically maintenance cost but could be fuel savings (as negative value), etc.Total First Year Operating Costs = $ - Annual Electricity Inflation Rate = 3% From "Input 1" worksheet

Annual O&M Inflation Rate = 6% From "Input 1" worksheetDiscount Rate = 6% From "Input 1" worksheet

Anticipated Years of Chiller Use = 25 From "Input 1" worksheet

CHILLER LOAD PROFILETons 600 540 480 420 360 300 240

Entering Condenser

Water Temperature

(ECWT)°F

Building Condenser Water Pressure Drop @ Design GPM not including condenser pressure drop

Building Chilled Water Pressure Drop @ Design GPM not including evaporator pressure drop

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KWH/YR 0 0 0 0 0 0 0 Hours/YR 0 0 0 0 0 0 0 KW/tonECWT at Load 75 75 70 70 65 65 65

85 80 75 70 70 70 70


600 Ton York Variable Speed Centrifugal

years

Degrees F. Leaving Evaporator Water Temperature (LEWT)

300 240 180 120

44 degree F. LEWT

Ft of Head

Ft of Head

Ft of Head

Ft of Head

Include variations in installation costs, package pricing, etc.This is often the incremental cost difference between a code compliant chiller and a more efficient and expensive chiller.

This may equal the cost of the least expensive code compliant chiller.

7.0 years Pick a long enough contract duration to include all major sechduled maintenance.

GPM x Ft Head x (.746/.92) x Annual Hrs x 0.000308 equals full speed KWH/Yr

Typically maintenance cost but could be fuel savings (as negative value), etc.

CHILLER LOAD PROFILE180 120 100% to 20% in 10% increments

not including condenser pressure drop Building Pumping energy can be added to your calculations but it is not necessary for selecting a chiller. This would be a good place to compare piping and control variables.

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0 0 0 0

65 65

65 60


Default Condenser Temperature Value Suggestions which you may choose to provide to vendors to help them select an offering. These numbers might work in the Puget Sound area but can vary dramatically depending on your humidity levels.

System designer will provide information for YELLOW cells.

This is often the incremental cost difference between a code compliant chiller and a more efficient and expensive chiller.

Pick a long enough contract duration to include all major sechduled maintenance.

100% to 20% in 10% increments



Building Pumping energy can be added to your calculations but it is not necessary for selecting a chiller. This would be a good place to compare piping and control variables.


Default Condenser Temperature Value Suggestions which you may choose to provide to vendors to help them select an offering. These numbers might work in the Puget Sound area but can vary dramatically depending on your

Inputs Linked from "Input 1" Page Inputs Linked from "Input 2" Page

25 Study Period (Years) 25

3% Electricity Inflation Rate 3%6.0% Annual O&M Inflation Rate 6.0%

6.0% Discount Rate 6.0%

$0 Initial Net Cost $ -

$ - First Year Electric Costs $ -

$ - Annual O&M Cost $ -

Annual Cash Flow Annual Cash Flow

Year Costs Total Costs Year

0 $ - $ - $ - 0

1 $ - $ - $ - $ - 1

2 $ - $ - $ - $ - 2

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30 N/A N/A N/A N/A 30

Totals $ - $ - $ - $ - $ - Totals

Operating Costs

Cost Adjustments: Maint. Contract, etc.

Net Present Value of Total Costs

Inputs Linked from "Input 2" Page Inputs Linked from "Input 3" Page

Study Period (Years) 25 Study Period (Years)

Electricity Inflation Rate 3% Electricity Inflation Rate

Annual O&M Inflation Rate 6.0% Annual O&M Inflation Rate

Discount Rate 6.0% Discount Rate

Initial Net Cost $ - Initial Net Cost

First Year Electric Costs $ - First Year Electric Costs

Annual O&M Cost $ - Annual O&M Cost

Annual Cash Flow Annual Cash Flow

Costs Total Costs Year Costs

$ - $ - $ - 0 $ -

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$ - $ - $ - $ - $ - Totals $ -

Operating Costs



Inputs Linked from "Input 3" Page

Study Period (Years)

Electricity Inflation Rate

Annual O&M Inflation Rate

Discount Rate

Initial Net Cost

First Year Electric Costs

Annual O&M Cost

Annual Cash Flow

Total Costs

$ - $ -

$ - $ - $ - $ -

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$ - $ - $ - $ -

Operating Costs



Documents

Chiller Estimator 3.0