Abstract: 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.

Abstract: A refrigeration system comprises a plurality of assembled modular units each having a refrigeration circuit separate from the circuit of the other units. Each unit includes a housing which defines at least one compartment containing the evaporator of the refrigeration circuit. The condenser is either located in a second compartment in the housing or in a separate chamber associated therewith. A first heat exchange fluid is conveyed to and from the compartment by header pipes, the header pipes of adjacent units being interconnected to form common manifolds for the system. A second heat exchange fluid is circulated passed the condensers of each unit. Electrical controls are provided on each unit to control and monitor operation of the respective refrigeration circuit the controls being interconnected to enable overall control of each unit of the system in accordance with load demand.