Air conditioning-hot water supply combined system

Abstract

There is provided a heat pump apparatus bringing heating water to a high temperature by connecting one or a plurality of load-side units to one heat source-side unit. The air conditioning-hot water supply combined system (heat pump apparatus) includes a heat source-side unit equipped with an air conditioning compressor, a four-way valve, and an outdoor heat exchanger; and the load-side units equipped with an air conditioning throttle, an indoor heat exchanger, a second compressor, a second load-side heat exchanger, and a second flow rate control unit. Here, a main circuit is configured by sequentially connecting the air conditioning compressor, the four-way valve, the outdoor heat exchanger, the air conditioning throttle, and the indoor heat exchanger, using a high-pressure side connection piping and a low-pressure side connection piping. On the other hand, a load-side refrigerant circuit is configured by sequentially connecting the second compressor, a second load-side heat exchanger second load-side heat exchanger, the second flow rate control unit, and the indoor heat exchanger using a load-side refrigerant piping.

1 . An air conditioning-hot water supply combined system, comprising:
 an air conditioning refrigeration cycle that circulates an air conditioning refrigerant in a first refrigerant circuit where an air conditioning compressor, flow path changeover means, an outdoor heat exchanger, an indoor heat exchanger, and air conditioning throttle means are connected in series, and where a refrigerant-refrigerant heat exchanger and hot water supply heat source throttle means are connected in series and in parallel to said indoor heat exchanger and said air conditioning throttle means; and   a hot water supply refrigeration cycle that circulates a hot water supply refrigerant in a second refrigerant circuit where a hot water supply compressor, a heat medium-refrigerant heat exchanger, hot water supply throttle means, and said refrigerant-refrigerant heat exchanger are connected in series,   wherein said air conditioning refrigeration cycle and said hot water supply refrigeration cycle are connected so that said air conditioning refrigerant and said hot water supply refrigerant exchange heat in said refrigerant-refrigerant heat exchanger.   
     
     
         2 . The air conditioning-hot water supply combined system of  claim 1 , further comprising:
 hot water supply control means that has hot water supply communication means for communicating information by wire or by radio, and that controls an operation of the hot water supply refrigeration cycle in response to a state of said hot water supply refrigeration cycle; and   air conditioning control means that has air conditioning communication means for communicating information by wire or by radio, and that controls an operation of the air conditioning refrigeration cycle in response to a state of said air conditioning refrigeration cycle,   wherein said hot water supply control means and said air conditioning control means cooperatively control the operation of said hot water supply refrigeration cycle and the operation of said air conditioning refrigeration cycle by said hot water supply communication means and said air conditioning communication means communicating with each other.   
     
     
         3 . The air conditioning-hot water supply combined system of  claim 2 , further comprising:
 at least one out of pressure detection means for detecting a pressure on a high-pressure side and temperature detection means for detecting a condensation temperature, in said hot water supply refrigeration cycle and   at least one out of pressure detection means for detecting a pressure on a low-pressure side and temperature detection means for detecting an evaporation temperature, in said hot water supply refrigeration cycle,   wherein said hot water supply control means and said air conditioning control means cooperatively control the operation of said hot water supply refrigeration cycle and the operation of said air conditioning refrigeration cycle by intercommunicating detection information from each detection means.   
     
     
         4 . The air conditioning-hot water supply combined system of  claim 2 , wherein said hot water supply control means calculates a compression ratio of said hot water supply compressor from detection information obtained by each detection means, and controls said hot water supply throttle means so that a calculation result of the compression ratio falls within a predetermined range. 
     
     
         5 . The air conditioning-hot water supply combined system of  claim 4 , wherein said hot water supply control means controls said hot water supply heat source throttle means on the basis of said calculation result. 
     
     
         6 . The air conditioning-hot water supply combined system of  claim 2 , further comprising:
 heat medium temperature detection means for detecting a temperature of a heat medium at an outlet side of said heat medium-refrigerant heat exchanger,   wherein, on the basis of information from said heat medium temperature detection means, said hot water supply control means controls said hot water supply compressor so that the temperature of the heat medium at the outlet side of said heat medium-refrigerant heat exchanger approaches a predetermined target value.   
     
     
         7 . The air conditioning-hot water supply combined system of  claim 2 , wherein, on the basis of at least one of a pressure on a high-pressure side, a condensation temperature, and a temperature at a position from an outlet of said hot water supply compressor to an inlet of the heat medium-refrigerant heat exchanger, said hot water supply control means estimates a temperature of a heat medium at an outlet side of said heat medium-refrigerant heat exchanger, and controls said hot water supply compressor so that an estimated value of the temperature of the heat medium approaches a predetermined target value. 
     
     
         8 . The air conditioning-hot water supply combined system of  claim 2 , wherein an upper limit value of frequency of said hot water supply compressor is changed on the basis of a temperature of a heat medium at an outlet side of said heat medium-refrigerant heat exchanger. 
     
     
         9 . The air conditioning-hot water supply combined system of  claim 2 , wherein, only when said indoor heat exchanger is operating, an upper limit value of frequency of said hot water supply compressor is changed on the basis of a temperature of a heat medium at an outlet side of said heat medium-refrigerant heat exchanger. 
     
     
         10 . The air conditioning-hot water supply combined system of  claim 2 , wherein said hot water supply compressor is controlled so that a heat exchange amount in said outdoor heat exchanger falls within a predetermined range. 
     
     
         11 . The air conditioning-hot water supply combined system of  claim 1 , further comprising:
 a hot water supply water circulation cycle, in which a water circulation pump, said heat medium-refrigerant heat exchanger, and a hot water storage tank are connected in series, and in which water is circulated as a heat medium,   wherein said hot water supply refrigerant and said water exchange heat in said heat medium-refrigerant heat exchanger to heat said water.   
     
     
         12 . The air conditioning-hot water supply combined system of  claim 1 , wherein each device constituting said hot water supply refrigeration cycle is accommodated in the same cabinet. 
     
     
         13 . The air conditioning-hot water supply combined system of  claim 1 , wherein, for said hot water supply refrigerant, a refrigerant having a critical temperature of 60° C. or more is adopted. 
     
     
         14 . The air conditioning-hot water supply combined system of  claim 3 , wherein said hot water supply control means calculates a compression ratio of said hot water supply compressor from detection information obtained by each detection means, and controls said hot water supply throttle means so that a calculation result of the compression ratio falls within a predetermined range. 
     
     
         15 . The air conditioning-hot water supply combined system of  claim 14 , wherein said hot water supply control means controls said hot water supply heat source throttle means on the basis of said calculation result. 
     
     
         16 . The air conditioning-hot water supply combined system of  claim 3 , further comprising:
 heat medium temperature detection means for detecting a temperature of a heat medium at an outlet side of said heat medium-refrigerant heat exchanger,   wherein, on the basis of information from said heat medium temperature detection means, said hot water supply control means controls said hot water supply compressor so that the temperature of the heat medium at the outlet side of said heat medium-refrigerant heat exchanger approaches a predetermined target value.   
     
     
         17 . The air conditioning-hot water supply combined system of  claim 3 , wherein, on the basis of at least one of a pressure on a high-pressure side, a condensation temperature, and a temperature at a position from an outlet of said hot water supply compressor to an inlet of the heat medium-refrigerant heat exchanger, said hot water supply control means estimates a temperature of a heat medium at an outlet side of said heat medium-refrigerant heat exchanger, and controls said hot water supply compressor so that an estimated value of the temperature of the heat medium approaches a predetermined target value. 
     
     
         18 . The air conditioning-hot water supply combined system of  claim 3 , wherein an upper limit value of frequency of said hot water supply compressor is changed on the basis of a temperature of a heat medium at an outlet side of said heat medium-refrigerant heat exchanger. 
     
     
         19 . The air conditioning-hot water supply combined system of  claim 3 , wherein, only when said indoor heat exchanger is operating, an upper limit value of frequency of said hot water supply compressor is changed on the basis of a temperature of a heat medium at an outlet side of said heat medium-refrigerant heat exchanger. 
     
     
         20 . The air conditioning-hot water supply combined system of  claim 3 , wherein said hot water supply compressor is controlled so that a heat exchange amount in said outdoor heat exchanger falls within a predetermined range.