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Chiller Plant EER Calculator

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Input Parameters

Unit System

Capacity: 30.0 tons

Performance Results

Efficiency Metrics

14
EER BTU/hr/W
4
COP
1
kW/ton kW/ton

Performance Rating

Excellent
EER: 14.40 BTU/hr/W

System Performance

Efficiency93.79 %
Power Consumption25 kW
Cooling Capacity30 tons

Water Side Performance

Water Temp Rise10 °F
Water Flow Rate72 GPM
Heat Rejection445,300 BTU/hr

Energy Analysis

Annual Energy Consumption:219,000 kWh
Annual Energy Cost:$26280
Energy per Ton-Hour:0.83 kWh

Chiller Performance Analysis

Detailed Chiller Performance Analysis

Efficiency Analysis

EER Rating:14.40 BTU/hr/W
COP Rating:4.22
kW per Ton:0.83
Efficiency:93.8%

Operating Conditions

Cooling Capacity:30.0 tons
Power Input:25 kW
Water ΔT:10.0°F
Heat Rejection:37.1 tons

Optimization Tips

• High kW/ton - optimize operating conditions
• Maintain proper water treatment
• Consider variable speed drives

Chiller Efficiency Comparison

Chiller TypeTypical EERYour EERPerformance
Air-Cooled Screw8.0 - 10.014.40Good
Water-Cooled Centrifugal10.0 - 12.014.40Excellent
Absorption Chiller0.5 - 0.7 COP4.22Acceptable

Chiller EER Calculation Steps

1

Convert Power to Watts

Formula:
Pwatts=PkW×1000P_{watts} = P_{kW} \times 1000
Calculation:
Pwatts=25×1000P_{watts} = 25 \times 1000
Result:
25000 W25000 \text{ W}
2

Calculate Energy Efficiency Ratio (EER)

Formula:
EER=QcoolingPwattsEER = \frac{Q_{cooling}}{P_{watts}}
Calculation:
EER=360,00025,000EER = \frac{360,000}{25,000}
Result:
14.40 BTU/hr/W14.40 \text{ BTU/hr/W}
3

Calculate Coefficient of Performance (COP)

Formula:
COP=EER3.412COP = \frac{EER}{3.412}
Calculation:
COP=14.403.412COP = \frac{14.40}{3.412}
Result:
4.22 4.22 \text{ }
4

Calculate kW per Ton

Formula:
kWton=PkWQcooling/12000\frac{kW}{ton} = \frac{P_{kW}}{Q_{cooling}/12000}
Calculation:
kWton=25360,000/12000=2530.0\frac{kW}{ton} = \frac{25}{360,000/12000} = \frac{25}{30.0}
Result:
0.83 kW/ton0.83 \text{ kW/ton}
5

Calculate Efficiency (relative to ideal COP of 6)

Formula:
η=COPactualCOPideal×100%\eta = \frac{COP_{actual}}{COP_{ideal}} \times 100\%
Calculation:
η=4.226×100%\eta = \frac{4.22}{6} \times 100\%
Result:
93.8 \text{ %}
6

Calculate Water Temperature Rise

Formula:
ΔTwater=Tentering−Tleaving\Delta T_{water} = T_{entering} - T_{leaving}
Calculation:
ΔTwater=95−85\Delta T_{water} = 95 - 85
Result:
10.0 °F10.0 \text{ °F}
7

Calculate Heat Rejection

Formula:
Qrejection=Qcooling+PkW×3412Q_{rejection} = Q_{cooling} + P_{kW} \times 3412
Calculation:
Qrejection=360,000+25×3412Q_{rejection} = 360,000 + 25 \times 3412
Result:
445,300 BTU/hr445,300 \text{ BTU/hr}