Abstract: There is disclosed an apparatus for easily recovering a refrigerant from a refrigerant circuit of a refrigeration apparatus at a low cost. A refrigerant recovery apparatus 6A is provided with a pipeline 7 for connection to the refrigerant circuit, a valve 17 with a clamping/piercing function disposed on the tip end of this pipeline 7, and a refrigerant recovery main body 10A containing a solid adsorbent 9 which can selectively adsorb the refrigerant, and the clamping/piercing function valve 17 is attached to the refrigerant circuit to make a small hole in the refrigerant circuit so that the refrigerant is adsorbed/recovered to the solid adsorbent 9.

Abstract: An object of the invention is to settle an unbalanced refrigerant flow in a heat exchanger thereby to improve a heat exchanging efficiency. In a heat exchanger having a refrigerant conduit provided through a plurality of fins, the refrigerant conduit is divided into a plurality of sets, each consisting of a plurality of parallel conduits, and parallel conduits of a set are put in communication with each other at ends thereof and in communication, through a single passage, with ends of parallel conduits of another set.

Abstract: A refrigeration cycle including a compressor, an indoor heat exchanger, an expansion, an outdoor heat exchanger and a six-way change-over valve having a refrigerant passage through which refrigerant flows in a refrigerant circuit comprising the compressor, the indoor heat exchanger, the expansion and the outdoor heat exchanger, wherein the six-way change-over valve serves to selectively switch the refrigerant passage so that the refrigerant passing in the indoor and outdoor heat exchangers flows in the same direction at any time when the refrigerant cycle is switched to a cooling operation cycle and to a heating operation cycle.

Abstract: An air conditioning system making use of waste heat comprising a compound absorption refrigeration machine and absorption type heat pump for both cooling and heating. The refrigeration machine and the heat pump are connected in parallel to the load to obtain hot water for utility of air heating, and the refrigeration machine operates utilizing hot water produced by the heat pump to produce cold water for air cooling.