Heat pump air conditioning system
First Claim
1. A heat pump air conditioning system, comprising:
- a refrigeration cycle having a compressor for compressing a refrigerant, means for exchanging heat including an evaporator for evaporating said refrigerant and a condenser for condensing said refrigerant, and an expansion valve for controlling passage of said refrigerant;
first means for measuring an ambient temperature;
second means for measuring a temperature of said refrigerant;
third means for measuring a pressure of said refrigerant; and
controlling means receiving the measured data of said ambient temperature, said temperature of said refrigerant and said pressure of said refrigerant for controlling a rotational speed of said compressor and an opening of said expansion valve in accordance with said measured data to maximize a coefficient of performance of said refrigeration cycle.
9 Assignments
0 Petitions
Accused Products
Abstract
A heat pump air conditioning system with an active digital control of the refrigeration cycle thereof to improve the coefficient of performance. The system can incorporate solar collectors in parallel with the outdoor heat exchanger and a water storage tank in the system to maximize the utilization of solar heating and nocturnal cooling as an additional heat source or heat sink means when such are available to further improve the coefficient of performance. The system also incorporates individual temperature control mechanisms in each room to circulate an adequate amount of water from the storage tank in accordance with the heat demand of each room, thus contributing to realization of an energy efficient central air conditioning system.
162 Citations
31 Claims
-
1. A heat pump air conditioning system, comprising:
-
a refrigeration cycle having a compressor for compressing a refrigerant, means for exchanging heat including an evaporator for evaporating said refrigerant and a condenser for condensing said refrigerant, and an expansion valve for controlling passage of said refrigerant; first means for measuring an ambient temperature; second means for measuring a temperature of said refrigerant; third means for measuring a pressure of said refrigerant; and controlling means receiving the measured data of said ambient temperature, said temperature of said refrigerant and said pressure of said refrigerant for controlling a rotational speed of said compressor and an opening of said expansion valve in accordance with said measured data to maximize a coefficient of performance of said refrigeration cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A heat pump air conditioning system, comprising:
-
a refrigeration cycle which further comprises; an outdoor heat exchanger installed outdoors for exchanging heat via refrigerant; a solar collector coupled in parallel with said outdoor heat exchanger for collecting solar energy; means for selecting one of said outdoor heat exchanger and said solar collector at a time for heat transfer between said refrigerant and outdoor ambient air and/or heat radiating objects; a compressor coupled to said outdoor heat exchanger and said solar collector for compressing said refrigerant; an expansion valve coupled to said outdoor heat exchanger and said solar collector for controlling a flow rate of said refrigerant; and a storage tank having at least one of an indoor heat exchanger installed indoors and a storage tank heat exchanger disposed therein, each of which acts as a condenser when said outdoor heat exchanger or said solar collector is used as an evaporator and acts as an evaporator when said outdoor heat exchanger or said solar collector is used as a condenser, for transferring heat between said refrigerant and indoor and outdoor air and between said refrigerant and the water in said storage tank, respectively; first means disposed in said outdoor heat exchanger for measuring an ambient temperature; second means for measuring a temperature of said refrigerant; third means for measuring a pressure of said refrigerant; fourth means disposed in said solar collector for measuring an equivalent ambient temperature; and controlling means receiving the measured data of said ambient temperature, said temperature of said refrigerant and said pressure of said refrigerant for controlling a rotational speed of said compressor and an opening of said expansion valve in accordance with said measured data to maximize a coefficient of performance of said refrigeration cycle. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A heat pump air conditioning system, comprising:
-
an outdoor heat exchanger installed outdoors for exchanging heat via refrigerant; a solar collector coupled in parallel with said outdoor heat exchanger for collecting solar energy; means for selecting one of said outdoor heat exchanger and said solar collector at a time for heat transfer between said refrigerant and outdoor ambient air and/or heat radiating objects; a compressor coupled to said outdoor heat exchanger and said solar collector for compressing said refrigerant; an expansion valve coupled to said outdoor heat exchanger and said solar collector for controlling a flow rate of said refrigerant; a storage tank heat exchanger disposed in a storage tank which acts as a condenser when said outdoor heat exchanger or said solar collector is used as an evaporator and acts as an evaporator when said outdoor heat exchanger or said solar collector is used as a condenser, for transferring heat between said refrigerant and the water in said storage tank, said storage tank storing the water performed the heat exchange with said refrigerant in said storage tank heat exchanger; first means disposed in said outdoor heat exchanger for measuring an ambient temperature; second means for measuring a temperature of said refrigerant; third means for measuring a pressure of said refrigerant; fourth means disposed in said solar collector for measuring an equivalent ambient temperature; controlling means receiving the measured data of said ambient temperature, said temperature of said refrigerant and said pressure of said refrigerant for controlling a rotational speed of said compressor and an opening of said expansion valve in accordance with said measured data to maximize a coefficient of performance of said refrigeration cycle; a variable speed circulation pump for delivering said water at a constant pressure; a solenoid valve arranged indoors for interrupting flow of water or allowing passing of the water flow from said variable speed circulation pump; a flow control valve for regulating the circulation rate of said water flow; an indoor heat exchanger for performing heat transfer between the indoor air and said water flow; and means for controlling said variable speed circulation pump, said solenoid valve, and said flow control valve in response to an indoor heat demand to introduce an appropriate amount of said water flow into said indoor heat exchanger. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
-
Specification