The COP (Coefficient of Performance) is the main energy efficiency indicator for refrigeration systems and heat pumps. It expresses the relationship between useful energy produced and electrical energy consumed.
COP Formula
COP = Cooling Capacity (kW) ÷ Electrical Power Consumed (kW)
Value Interpretation
| COP | Classification | Typical Application |
|---|---|---|
| < 3.0 | Low | Old equipment |
| 3.0 - 4.0 | Medium | Standard scroll chillers |
| 4.0 - 5.0 | High | Efficient screw chillers |
| 5.0 - 7.0 | Very High | Centrifugal/oilfree chillers |
| > 7.0 | Exceptional | Premium magnetic chillers |
Practical Example
- A chiller with:
- Capacity: 100 TR (352 kW)
- Electrical consumption: 88 kW
- COP = 352 ÷ 88 = 4.0
This means that for every 1 kW of electrical energy consumed, the chiller produces 4 kW of cooling.
Factors Affecting COP
- Condensing temperature: Lower = higher COP
- Evaporating temperature: Higher = higher COP
- Compressor type: Centrifugal and screw have higher COP
- Partial load: COP varies with demand
- Maintenance: Well-maintained equipment has higher COP