Summary

Two high-efficiency multiplex supermarket refrigeration systems with total heat reclaim
capability, and a high-speed defrost system are presented. The first heat reclaim system
involves directional and modulating valves to communicate the superheated vapour to the air cooled condensers or to the heat reclaim coils, and to adjust the pressure according to the outside temperature.
A refrigerant reservoir receives liquid from both condensers and heat reclaim coils, and a sub-cooling heat exchanger with a by-pass and a special expansion valve is also provided. In the second heat reclaim system, heat pumps are installed on the discharge line of a refrigeration system with floating head pressure to recover the total heat and to provide comfort heating of the building during the cold periods of the year. When no heat reclaim is required, the heat pump system is used for air conditioning and sub-cooling purposes. The first European Heat Pump Summit; powered by Chillventa; will take place September 9-10 at the CongressCenter in Nuremberg. The summit will deal with heat pump technologies in the industrial, commercial, residential, heating & cooling, components & equipment segments.