Chiller Performance Measurement

Overview
The performance assessment of the chiller plant involves calculation of cooling duty delivered by the system and measurement of power consumed by the unit. The Specific Power Consumption (SPC - kW/TR) and Energy Efficiency Ratio (EER) are the effective measures for comparing the electrical energy input to cooling duty delivered by the system. The study involves measuring various parameters such as flow rate, temperature and power in the both chilled water and refrigeration side of the chiller system.
Refrigeration Effect
Formula
- Refrigeration Effect (TR) = (Flow(Q) × Cp × (Ti – T0)) / 3024
Where:
- Q = Flow Rate m3/s
- Cp = Specific Heat kcal/kg deg C
- Ti = Inlet Temperature (Deg C)
- T0 = Outlet Temperature (Deg C)
Scope of Work
Case Study
Energy Conservation Measures
- Maintain the chiller Specific norms and reduce the chiller consumption by Overhaul of the Existing Chiller
Calculation
| SN | Parameter | Unit | Chiller |
|---|---|---|---|
| 1 | Actual Chiller Capacity Requirement | TR | 103.34 |
| 2 | Existing Specific energy consumption of screw chiller | kW/TR | 0.81 |
| 3 | Suggest Specific energy consumption of screw chiller | kW/TR | 0.70 |
| 4 | Specific Energy Consumption Saving | kW/TR | 0.11 |
| 5 | Power Saving | kW | 11.58 |
| 6 | Electrical unit cost | Rs/kWh | 9.57 |
| 7 | Daily working hour | hr | 24.00 |
| 8 | Annual Operating Day | Day | 330.00 |
| 9 | Annual Power Saving | kWh | 91693 |
| 10 | Annual Monetary saving | Rs | 877067 |
| 11 | Investment of Overhaul Water Cooled Screw chiller | Rs | 600000 |
| 12 | Simple Payback period | Month | 8.21 |
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