| 摘要 |
The fluid heating system has a heat pump comprising a compressor 102, a first heat exchanger 104 and a second heat exchanger 106 connected by a refrigerant pipe-work system 108. When heating a fluid such as water, the first and second heat exchangers are operated as a condenser and an evaporator, respectively. The first heat exchanger has a primary inlet on a primary side 104a that receives refrigerant and a secondary inlet 128a and outlet 128b on a secondary side 104b for water circulated from a storage vessel 114 by a fluid pipe-work system 116a. At least one temperature sensor 130 measures the temperature of water entering the secondary side of the first heat exchanger. A system controller (202, figure 2) uses the detected temperature to generate a reference temperature as a function of at least one of the secondary inlet or outlet temperature. The temperature of the primary side of the first heat exchanger is maintained at a determined temperature interval from the reference temperature, ideally 2 degrees centigrade above or below the reference temperature depending on whether fluid heating or cooling is desired. This maximises the co-efficient of performance of the heat pump. |
