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An air-conditioning apparatus includes an air-conditioner and an oxygen ratio increasing device. The air-conditioner has an indoor unit having an indoor heat exchanger and arranged in a room to be air-conditioned, and an outdoor unit having an outdoor heat exchanger and arranged outdoors. These unit

An air-conditioning apparatus includes an air-conditioner and an oxygen ratio increasing device. The air-conditioner has an indoor unit having an indoor heat exchanger and arranged in a room to be air-conditioned, and an outdoor unit having an outdoor heat exchanger and arranged outdoors. These units are connected to each other through a coolant pipe. The increasing device has an oxygen ratio increasing mechanism for producing oxygen-ratio increased air having a high oxygen concentration, and an air supply pipe for supplying the produced oxygen-ratio increased air into the room. The mechanism is arranged in the outdoor unit, and includes an adsorbing material for adsorbing nitrogen in air to produce the oxygen-ratio increased air and an air compressor for supplying air to the air supply pipe through the adsorbing material.

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An air-conditioning apparatus comprising: an air-conditioner including an indoor unit having an indoor heat exchanger and arranged in a room to be air-conditioned; an outdoor unit having an outdoor heat exchanger and arranged outdoors; and a coolant pipe for connecting said indoor and outdoor heat e

An air-conditioning apparatus comprising: an air-conditioner including an indoor unit having an indoor heat exchanger and arranged in a room to be air-conditioned; an outdoor unit having an outdoor heat exchanger and arranged outdoors; and a coolant pipe for connecting said indoor and outdoor heat exchangers; an oxygen ratio increasing device including: an oxygen ration increasing mechanism, arranged in said outdoor unit, for producing oxygen-ratio increased air having a high oxygen concentration; and supplying means for supplying the produced oxygen-ratio increased air to the room; and wherein said oxygen ratio increasing mechanism includes: an adsorbing material for adsorbing nitrogen from air when said adsorbing material is compressed to a pressure more than a predetermined value and for eliminating the adsorbed nitrogen when said adsorbing material is pressure-reduced to a pressure less than the predetermined value, an air compressor for supplying air to said supplying means through said adsorbing material, first and second tanks connected, in parallel to each other, between the delivery side of the air compressor and the supply means and each containing the adsorbing material therein, switching means for causing outlet sides of the tanks to alternately connect to the supplying means and an outer atmosphere so as to allow the adsorbing material in the tanks to alternately perform an adsorption operation and a regeneration operation, a first restrictor arranged between the supplying means and the first and second tanks, check valves respectively arranged between the first tank and the first restrictor and between the second tank and the first restrictor, a bypass which communicates with a path between the first tank and the check valve and a path between the second tank and the check valve, and a second restrictor arranged in the bypass and having a larger restriction resistance than that of the first restrictor.