| 摘要 |
PCT No. PCT/AU89/00012 Sec. 371 Date Jul. 17, 1990 Sec. 102(e) Date Jul. 17, 1990 PCT Filed Jan. 13, 1989 PCT Pub. No. WO89/06774 PCT Pub. Date Jul. 27, 1989.A heating and/or cooling system incorporates a number of modular refrigeration units each of which includes at least one compressor, an evaporator and a condenser. A variable speed circulating water pump circulates water through each evaporator/condenser, which are connected in parallel across the respective supply line and return line. A master controller activates and deactivates individual compressors in accordance with load demand. Shut-off valves close off the water flow through the respective evaporator and/or condenser of any units deactivated and the resulting changes in the pressure differential in the supply and return lines is sensed by sensor which sends a signal to the pump motor speed controller which changes the output of the pump to restore a predetermined pressure differential.
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