a place where the compressed gas is to be used or stored such use or storage may include the storage valve 22 and compressed gas storage means 23 the compressed gas may also be used immediately rather than stored heat exchange in both the pre compression heat exchanger cooling coils 15 and post compression heat exchanger cooling coils 20 is accomplished by using an absorption chiller 24 in conjunction with a cooling tower 25 heat energy to actuate the absorption chiller 24 is obtained from the heat energy transferred in the post compression heat exchanger 18 by means of a liquid delivery system the post compression heat exchanger cooling coils 20 contain water which transfer the heat energy removed in the post compression heat exchanger 20 the water travels through the post compression heat exchanger return line 26 whereby the heated water is channelled into the concentrator supply line 27 through the concentrator supply line control valve 28 water from the post compression heat exchanger return line 26 is also channelled through the absorption chiller bypass line 29 the absorption chiller 24 operates under standard principals of absorption chilling machines and although multiple embodiments of absorption chillers are produced and available on the market two such embodiments.