SOLAR PHOTOVOLTAIC -COMMERCIAL ELECTRICITY DUALLY DRIVEN HEAT PUMP SYSTEM WITH COLD/HEAT STORAGE

• US 20110296865A1
• Filed: 01/15/2010
• Published: 12/08/2011
• Est. Priority Date: 01/15/2009
• Status: Abandoned Application

• Current Assignee: Weixing Yuan, Xiugan Yuan, Yufei Yang
• Original Assignee: Weixing Yuan, Xiugan Yuan, Yufei Yang
• Inventors: Yuan, Weixing, Yang, Yufei, Yuan, Xiugan
• Application Number:
  US13/142,452
• Publication Number:
  US 20110296865A1
• Time in Patent Office: Days
• US Class Current: 62/430
• CPC Class Codes: F25B 2400/075 with parallel compressors
• CPC Class Codes: F25B 2400/24 Storage receiver heat
• CPC Class Codes: F25B 27/005 in compression type systems
• CPC Class Codes: F25B 2700/1931 Discharge pressures
• CPC Class Codes: F25B 2700/1933 Suction pressures
• CPC Class Codes: F25B 2700/2111 of a heat storage receiver
• CPC Class Codes: F25B 29/003 of the compression type system

Abstract

A hybrid-driven cold/heat storage type heat pump unit utilizing a solar photovoltaic power and a commercial power, which has a DC compressor (2) and an AC compressor (8), is a dual supply heat pump system driven by a solar photovoltaic DC power and a common commercial AC power in combination. When there is sunshine, the DC generated by a solar cell panel (60) is used for driving the DC compressor (2) directly to produce cold and heat capacity, and the produced cold and heat capacity could be stored respectively in a phase-change cold storage medium (39) and a phase-change heat storage medium (20). When the DC power is insufficient, the AC power from power network is used for power supply.

Claims

1. A solar photovoltaic-commercial electricity dually driven heat pump system with cold/heat storage, characterized by comprising:

a compressor module including a DC compressor sub-system (A);

a photovoltaic DC power source sub-system (K) for supplying power to said DC compressor sub-system (A);

an air source condenser (D);

a throttle device (G);

an air source evaporator (I);

a heat storage sub-system (C) coupled between said compressor module and said air source condenser (D), wherein said heat storage sub-system (C) contains heat storage phase change material (20) for absorbing heat from refrigerant;

a cold storage sub-system (H) coupled between said throttle device (G) and said air source evaporator (I), wherein said cold storage sub-system (H) contains cold storage phase change material (39) for being frozen by said refrigerant;

wherein said compressor module, said heat storage sub-system (C), said air source condenser (D), said cold storage sub-system (H), said throttle device (G), and said air source evaporator (I) form into a loop by pipe lines, for allowing refrigerant to circulate in said loop.

2. A heat pump system with cold and heat storage of claim 1, characterized in the said compressor module further comprises an AC compressor sub-system (B) connected in parallel with the said DC compressor sub-system (A).

3. A heat pump system with cold and heat storage of claim 2, characterized in the four solenoid valves (1, 3, 7, 9) are provided in said compressor module for controlling the state of connection in said loop of refrigerant circulation of a DC compressor (2) in said DC compressor sub-system (A) and an AC compressor (8) in said AC compressor sub-system (B).

4. A heat pump system with cold and heat storage of claim 1, characterized in the

said heat storage sub-system (C) comprises:

a heat storage container (17) with good thermal insulation containing said heat storage phase change material (20) therein;

a first coil heat exchanger (23) provided within said heat storage container (17) and being connected in said loop of refrigerant circulation, for allowing refrigerant in said first coil heat exchanger (23) to exchange heat with said heat storage phase change material (20); and

a second coil heat exchanger (26) provide in said heat storage container (17), for allowing water flowing through said second coil heat exchanger (26) to exchange heat with the heat storage phase change material (20) inside said heat storage container (17),

said cold storage sub-system (H) comprises;

a cold storage container (38) having good thermal insulation, for containing cold storage phase change material (39);

a third coil heat exchanger (46) provided in said cold storage container (38) and being connected in said loop of refrigerant circulation, for allowing refrigerant in said third coil heat exchanger (46) to exchange heat with said cold storage phase change material (39); and

a forth coil heat exchanger (43) provided in said cold storage container (38), for allowing water flow through said forth coil heat exchanger (43) to exchange heat with the cold storage phase change material (39) in said cold storage container (38).

5. A heat pump system with cold and heat storage of claim 1, characterized by further comprising:

a first solenoid valve (31) for bypassing said refrigerant so that said refrigerant does not go through said air source condensor (D);

a second solenoid valve (49) for bypassing said refrigerant so that said refrigerant does not go through said air source evaporator (I)

wherein each of said first solenoid valve (31) and said second solenoid valve (49) is provided in said refrigerant circulation loop.

6. A heat pump system with cold and heat storage of claim 5, characterized by

a first temperature sensor (19) is provided in said heat storage sub-system (C) for detecting the temperature of said heat storage phase change material (20), so as to determine the working statuses of said first solenoid valve (31);

and

a second temperature sensor (42) is provided in said cold storage sub-system (H) for detecting the temperature of said cold storage phase change material (39), so as to determine the working statuses of said second solenoid valve (49).

7. A heat pump system with cold and heat storage of claim 1, characterized in the said heat storage phase change material (20) can be one selected from paraffin, hydrated salt, and sodium sulfate decahydrate, and said cold storage phase change material (39) can be one selected from glycerol, water, hydrated salt, and paraffin.

8. A heat pump system with cold and heat storage of claim 1, characterized in that

a third solenoid valve (28) for bypassing said refrigerant so that said refrigerant does not go through said heat storage sub-system (C), and

a forth solenoid valve (36) for bypassing said refrigerant so that said refrigerant does not go through said cold storage sub-system (H),

wherein each of said third solenoid valve (28) and said forth solenoid valve (36) is provided in said refrigerant circulation loop.

9. A heat pump system with cold and heat storage of claim 1, characterized in that said photovoltaic DC power source sub-system (K) comprises a solar cell assembly (60), a junction box (59), a storage battery (58), and a power and voltage regulator (57).

10. A heat pump system with cold and heat storage of claim 1, characterized in that a high pressure sensor (4) is provided in the high pressure pipe line of said system, a low pressure sensor (5) is provided in the low pressure pipe line of the system, and safety valves (18, 47) are provided in said heat storage sub-system (C) and said cold storage sub-system (H).