installed after the compressor uses solar radiation to heat up the water. An insulated water storage tank is connected to the vacuum solar collector to maintain the water temperature. The refriger-ant from the compressor goes through the copper coil inside the tank for heat exchanges (point 3). When the air-conditioned room reaches its desired set-point temperature, the compressor turns off. This additional kinetic energy helps it to stay off longer, thus reducing its duty cycle and hence increasing the system average COP. However, during the compressor’s operation time in full load conditions, additional heat absorbed by the refrigerant in the water storage tank needs to be rejected in the condenser, thus requiring a slightly larger condenser area. This will be discussed later in the section on energy analysis.After the storage tank, a further temperature reduction takes place in the condenser and causes it to de-superheat (point 4); thus, the refrigerant liquid is sub-cooled as it enters the expan-sion device (point 5). Sub-cooling prevents flash gas formation before the expansion device and increases the evaporator’s refriger-ation effect. The high pressure sub-cooled refrigerant flows through the capillary tube, which reduces both its pressure and tempera-ture.
đang được dịch, vui lòng đợi..
