| 摘要 |
<p>1483148 Heat pumps PROJECTUS INDUSTRIPBODUKTER AB 14 April 1975 [18 April 1974] 15259/75 Headings F4H and F4U A heating installation includes a central heating system comprising a fuel-fired boiler 11, a radiator circuit 7, 8, 9 and a hot water tank 20; and a heat pump comprising a compressor 4, an evaporator 2, an expansion valve 6 and a condenser 5. The condenser 5 is connected in parallel with the boiler 11 in the central heating system. The installation also includes means for measuring the refrigerant pressure between the evaporator and compressor and for controlling the compressor in accordance with the measured pressure. The heat pump compressor is preferably of the multi-cylinder kind whereby one or more pistons can be shut down or cut in according to the varying heat demand. Alternatively, the rotational speed of the compressor can be controlled. In addition, the compressor 4 can be arranged to be shut down or cut in in accordance with the boiler water temperature. A thermostat 25 is provided to sense the temperature of the boiler and to control the stopping of the compressor motor 26.</p> |
