| 摘要 |
A defrost system 10 for a refrigerated display counter 11 is described. The system 10 comprises a defrost conduit 14 which is adapted to be positioned in close proximity to a refrigeration coil 12 of a refrigerated display counter 11. A heat exchanger 13 has a housing 16 which is adapted to be secured above the refrigerated display counter. The housing is provided with a plurality of fans 18 for directing ambient air into the housing and out through exhaust port 20. A heat exchange coil 22 is provided in the housing 16 and is interconnected with the defrost conduit 14 and through which flows a liquid such as glycol. A pump 28 circulates the defrost liquid through the circuit 24-25 and control valves 26-27 are provided to arrest the liquid flow in a non-defrost mode. In the defrost mode the glycol is heated by the ambient air which is convected through the heat exchange housing 16 and the cool air 9 generated at the outlet ducts 20 is mixed with hotter ambient air. The system is energy efficient.
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