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(11) | EP 1 967 801 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Hot water system |
| (57) A hot water system includes: a compressor (1); a four-way valve (2) for switching
the direction of the refrigerating cycle during defrosting operation; a water heat
exchanger (3) for transferring heat between water and the refrigerant; an electronic
expansion valve (4) for controlling the flow rate of the refrigerant to reduce the
pressure; and an air heat exchanger (5) for transferring heat between air and the
refrigerant, which are connected in that order by a pipeline (7) to form a refrigerating
cycle to heat the water. The hot water system further includes; a bypath (8) for redirecting
the refrigerant from a portion of the pipeline (7) in upstream of the electronic expansion
valve (4) to the inlet of the compressor (1) during defrosting operation; and a solenoid
valve (9) for switching installed in the bypath (8). When the solenoid valve (9) is
opened to redirect part of the refrigerant to pass through the water heat exchanger
(3) acting as an evaporator to the bypath (8) during defrosting operation, the amount
of the refrigerant to pass through the bypath (8) is controlled by changing the degree
of opening of the electronic expansion Valve (4).
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