The COP and the COSP

COSP = power (kW) COSP = power (kW)

Power input is that the compressor and all other engines (e.g. fan motors and pumps, and controls), associated with the system. Their effectiveness can be expressed as the COP is just the efficiency of the compressor, it does not account for input supply and other electrical components such as motors of fans and pumps. The COP varies depending on the temperature lift system - temperature lift the difference between the temperatures of evaporation and condensation. Example of the data in Fig. 5 shows that:

• productivity of the compressor increases when the temperature reduces lift;
• Power consumption is reduced when the condensing temperature drops;
• Power consumption increases, if boiling point increases, however, this increase in power consumption is not as great as the increase in capacity (hence the COP still goes up).
• The effectiveness of different types of compressors and manufacturers varies, and not necessarily in accordance with the valid price - it is important that the most efficient compressor for a particular application of carefully selected. It depends on the size of the cooling load is used refrigerant temperature applications and the average temperature of the cooling medium (i.e., ambient air or water).
• The quantity of refrigerant that has a significant impact on the temperature lift - too much or too little refrigerant, efficiency decreases. Systems that leakage of the refrigerant consume more energy than necessary. On average, it costs the UK refrigeration owners an additional 11% of the operating costs of the system. System, which are overloaded, can, in some cases, also to consume more energy than we need, and more refrigerant lose in the event of leakage.
• Refrigerant type also has an impact on energy use. Change can be as high as 10%, but this advantage can only usually be achieved when the hardware is optimized to meet the selected refrigerant. The most efficient refrigerant for the application depends on the compressor, the temperature of application and the average temperature of the cooling medium (i.e., ambient air or water).
• Suction superheat steam should be as low as possible - warmer vapor reduces the productivity of the compressor is not reducing its power. Direct expansion systems, this is achieved by proper management of expansion device, and all types of systems, by isolating suction line.

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