(57) A space cooling and heating and hot water supplying apparatus comprising a compressor
(1), a first indoor heat exchanger (3) for hot water supply connected at one end thereof
to the compressor at its discharge side via a conduit (1a), a second indoor heat exchanger
for space cooling and heating (6) and an outdoor heat exchanger (7) each switchingly
connected at one end thereof via a four-way valve (2) to an opposite end of the first
indoor heat exchanger and a suction side of the compressor via conduits (7a, 1 b,
4a, 6a), and an expansion valve (8) connecting together opposite ends of the second
indoor heat exchanger and outdoor heat exchanger via conduits (6b, 7b). The apparatus
further includes a first on-off valve (11a) and a second on-off valve (11b) operating
in reverse actions connected at one end thereof to inlet and outlet ports of a refrigerant
tank (10) for regulating the amount of a sealed-in refrigerant and at an opposite
end thereof to the lower pressure conduit (7b) and the higher pressure conduit (6b),
respectively, connected together by the expansion valve located at their boundary.
In a space heating mode, the refrigerant tank is brought into communication with the
lower pressure conduit when space heating and hot water supply are both needed, and
when only the hot water supply is needed, and in a space cooling mode, the refrigerant
tank is brought into communication with the lower pressure conduit when space cooling
and hot water supply are both needed and when only the hot water supply is needed,
and the refrigerant tank is brought into communication with the higher pressure conduit
when only the space cooling is needed.
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