Refrigerant circulating system
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsOsamu Morimoto, Fujio Hitomi, Moriya Miyamoto, Hidekazu Tani, Tomohiko Kasai, Yoshihiro Sumida, Hitoshi Iijima
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Abstract
A refrigerant circulation system of the present invention includes a compressor, a condenser, a evaporator, a throttle device and a control unit. The control unit controls a composition of a refrigerant circulating in the refrigerant circulation system based on a temperature and pressure of the refrigerant of an inlet and outlet portion of the compressor, condenser, evaporator and throttle device. The control unit controls to open and close the throttle device to change the composition of the refrigerant circulating in the refrigerant circulation system.
Claims14
A refrigerant circulating system using a refrigerant made of a nonazeotropic mixture including a plurality of types of refrigerants;
- comprising
- a refrigerant circuit having a compressor for compressing the refrigerant, a first heat exchanger for condensing the refrigerant during a cooling operation and evaporating the refrigerant during a heating operation, a main throttle device for changing pressure of the refrigerant flowing therethrough and a second heat exchanger for evaporating the refrigerant during a cooling operation and condensing the refrigerant during a heating operation, which are connected in order;
- a low pressure receiver for storing a liquid refrigerant therein, said low pressure receiver being connected to said compressor;
- a four-way valve which is disposed between said compressor and said first heat exchanger, said four-way valve being directly connected to said low pressure receiver and being connected to said second heat exchanger;
- a high pressure receiver for storing a liquid refrigerant therein which are disposed between said first heat exchanger and said main throttle device;
- a bypass piping which connects a bottom portion of said high pressure receiver with said low pressure receiver;
- an auxiliary throttle device for changing pressure of the refrigerant therethrough;
- a third throttle devise disposed on said bypass piping;
- a super cooling heat exchanger which performs a heat exchange between said bypass piping and a main piping from said main throttle device to said auxiliary throttle device;
- wherein said refrigerant flows in the direction from said first heat exchanger to said second heat exchanger during the cooling operation, and said refrigerant flows in the direction from said second heat exchanger to said first heat exchanger during the heating operation.
A refrigerating/air conditioning system using a refrigerant made of a nonazeotriptic mixture refrigerant in which several types of refrigerants are mixed, comprising:
- a compressor;
- a heat source side heat exchanger;
- a throttle device;
- a load side heat exchanger which is an evaporator when said heat source side heat exchanger is a condenser, and is said condenser when said heat source side heat exchanger is said evaporator;
- a low pressure receiver, wherein said compressor, said heat source side heat exchanger, said throttle device, said load side heat exchanger and said low pressure receiver are connected in a serial order to form a refrigerating cycle;
- and
- controlling means for calculating a composition of the refrigerant circulating in said cycle on the basis of detected temperature and pressure of the refrigerant, and for changing a set value for a control of said cycle in accordance with thus calculated values of the composition to control said cycle, wherein said controlling means changes an opening degree of said throttle device so that a degree of supercooling at the outlet port of said condenser becomes a predetermined value.
A refrigerating/air conditioning system using a refrigerant made of a nonazeotriptic mixture refrigerant in which several types of refrigerants are mixed, comprising:
- a compressor;
- a heat source side heat exchanger;
- a throttle device;
- a load side heat exchanger which is an evaporator when said heat source side heat exchanger is a condenser, and is said condenser when said heat source side heat exchanger is said evaporator;
- a low pressure receiver, wherein said compressor, said heat source side heat exchanger, said throttle device, said load side heat exchanger and said low pressure receiver are connected in a serial order to form a refrigerating cycle;
- controlling means for calculating a composition of the refrigerant circulating in said cycle on the basis of detected temperature and pressure of the refrigerant, and for changing a set value for a control of said cycle in accordance with thus calculated values of the composition to control said cycle;
- a four-way valve;
- a supercooling heat exchanger, wherein said heat source side heat exchanger, said four-way valve, said throttle device, said load side heat exchanger and said low pressure receiver are connected in a serial order to form said refrigerating cycle;
- a bypass piping which is branched off from said refrigerating cycle between said heat source side heat exchanger and said throttle device;
- a second throttle device, said bypass piping being connected with a low pressure piping via said second throttle device and said supercooling heat exchanger;
- first temperature detecting means for detecting a temperature of the refrigerant at an inlet port of said second throttle device;
- second temperature detecting means for detecting a temperature of the refrigerant at an outlet port of said second throttle device;
- and
- pressure detecting means for detecting a pressure of the refrigerant at the outlet port of said second throttle device;
- wherein said controlling means calculates the composition of the refrigerant on the basis of the temperature detected by said first and second temperature detecting means and the pressure detected by said pressure detecting means.
Dependencies are inferred from the claim text.