Gas heat pump air conditioning system

Abstract

A gas heat pump air conditioning system includes: a gas engine that generates power by using gas as a fuel; a heat pump cycle including a compressor that is driven by the gas engine and at least one heat exchanger disposed in an interior space and air-conditioning the interior space by the heat exchanger; a power generator that is driven by the gas engine and generates electric power; and a local air conditioner that is disposed in the interior space in which the heat exchanger is disposed and that air-conditions the interior space by using the electric power generated by the power genera or.

What is claimed is: 
     
         1 . A gas heat pump air conditioning system comprising:
 a gas engine;   a heat pump cycle that includes a compressor and at least one heat exchanger, the compressor being driven by the gas engine, the at least one heat exchanger being disposed in an interior space and air-conditioning the interior space;   a power generator that is driven by the gas engine and that generates electric power;   a local air conditioner that is disposed in the interior space and that air-conditions the interior space by using the electric power generated by the power generator; and   a control circuit that controls the power generator and the heat exchanger in accordance with an air conditioning load of the interior space.   
     
     
         2 . The gas heat pump air conditioning system of  claim 1 , wherein
 the control circuit
 stops the power generator while air conditioning by the heat exchanger is being performed, and 
 supplies electric power from the power generator to the local air conditioner while air conditioning by the heat exchanger is stopped. 
   
     
     
         3 . The gas heat pump air conditioning system of  claim 1 , wherein
 the control circuit switches an operation mode between a first operation mode in which the interior space is air-conditioned by the heat exchanger and a second operation mode in which the interior space is air-conditioned by the local air conditioner, in accordance with the air conditioning load of the interior space.   
     
     
         4 . The gas heat pump air conditioning system of  claim 1 , wherein
 in a case where a gas flow rate necessary for the gas engine in air-conditioning the interior space by the heat exchanger is higher than a gas flow rate necessary for the gas engine in air-conditioning the interior space by the local air conditioner, the control circuit controls the power generator and the heat exchanger, thereby causing the interior space to be air-conditioned by the local air conditioner, and   in a case where a gas flow rate necessary for the gas engine in air-conditioning the interior space by the heat exchanger is lower than or equal to the gas flow rate necessary for the gas engine in air-conditioning the interior space by the local air conditioner, the control circuit controls the power generator and the heat exchanger, thereby causing the interior space to be air-conditioned by the heat exchanger.   
     
     
         5 . The gas heat pump air conditioning system of  claim 1 , wherein
 the control circuit causes the power generator to supply electric power to the local air conditioner and starts air conditioning performed by the local air conditioner when a temperature change amount per unit time in the interior space that has been air-conditioned by the heat exchanger is less than or equal to a predetermined value.   
     
     
         6 . The gas heat pump air conditioning system of  claim 5 , wherein
 the control circuit
 selects a first operation mode in which the interior space is air-conditioned by the heat exchanger in a case where the temperature change amount per unit time in the interior space that has been air-conditioned by the heat exchanger exceeds the predetermined value, and 
 selects a second operation mode in which the interior space is air-conditioned by the local air conditioner in a case where the temperature change amount per unit time in the interior space that has been air-conditioned by the heat exchanger is less than or equal to the predetermined value. 
   
     
     
         7 . The gas heat pump air conditioning system of  claim 1 , wherein
 the heat exchanger included in the heat pump cycle includes a plurality of heat exchangers, and   the control circuit causes the local air conditioner to air-condition the interior space, instead of at least one of the plurality of heat exchangers.   
     
     
         8 . The gas heat pump air conditioning system of  claim 1 , further comprising a clutch that transmits power from the gas engine to the power generator, wherein
 the control circuit controls the number of revolutions of the power generator by controlling the clutch.   
     
     
         9 . The gas heat pump air conditioning system of  claim 1 , wherein
 the heat exchanger included in the heat pump cycle includes a plurality of heat exchangers,   the plurality of heat exchangers include a first heat exchanger and a second heat exchanger,   the air-conditioned area included in the interior space includes a plurality of air-conditioned areas, and   the plurality of air-conditioned areas include an ordinary-air-conditioned area that is air-conditioned by the first heat exchanger and a locally-air-conditioned area that is air-conditioned by one of the second heat exchanger and the local air conditioner.   
     
     
         10 . A gas heat pump aft conditioning system comprising:
 a gas engine;   a heat pump cycle that includes a compressor and a heat exchanger, the heat exchanger being disposed in an interior space and air-conditioning the interior space;   a power generator that is driven by the gas engine and that generates electric power; and   a local air conditioner that air-conditions the interior space by using the electric power generated by the power generator, wherein   an air-conditioned area with a high degree of the air conditioning load is air-conditioned by the local air conditioner, and the other air-conditioned areas are air-conditioned by the heat exchanger.   
     
     
         11 . The gas heat pump air conditioning system of  claim 10 , wherein
 the heat pump cycle performs a heating operation on the interior space by the heat exchanger disposed on a ceiling of the interior space, and   the local air conditioner is disposed on a floor of the interior space and performs a heating operation on the interior space.   
     
     
         12 . The gas heat pump air conditioning system of  claim 1 , wherein
 the local air conditioner is a portable electric warm-air fan heater.