Heat pump type air conditioner using circulating fluid branching passage

A heat pump type air conditioner including:

• a heat gas engine having a cooler and a radiator;
• a first outdoor heat exchanger provided in an outdoor unit;
• a first indoor heat exchanger provided in an indoor unit;
• at least one additional heat exchanger provided in at least one of said outdoor unit and said indoor unit;
• a first fluid passage through which fluid cooled through heat-exchange operation of said cooler is guided to a selected one of said first indoor heat exchanger and said first outdoor heat exchanger, and fluid heated through heat-exchange operation of said radiator is guided to the other of said first indoor heat exchanger and said first outdoor heat exchanger in room-cooling or room-heating operation;
• a second fluid passage through which a part of the fluid heated by said radiator is guided to the at least one heat exchanger;
• and
• fluid branching means for selectively allowing the part of the fluid heated by said radiator to flow into said second fluid passage.