Double-source heat pump unit with photovoltaic power and commercial power

Abstract

The utility model relates to a double-source heat pump unit with photovoltaic power and commercial power. Comprising a compressor, a photovoltaic power source, a mains supply, an air heat exchanger, a first four-way reversing valve, a second four-way reversing valve, a second one-way valve, a user terminal load, a first one-way valve, a fourth stop valve, a fifth stop valve, a gas-liquid separator, a liquid storage tank, a first electronic expansion valve, a first stop valve, a second electronic expansion valve, a second stop valve and a third electronic expansion valve. And a third stop valve, a swimming pool and a hot water heat exchanger. The device has the advantages that the waste heat recovery function is achieved, and heat of the condenser can be recovered for hot water or a swimming pool; and the condensing temperature is lower, the throttling temperature is reduced, and cold water with lower temperature is generated.

Description

Technical Field

[0001] This utility model relates to a dual-source heat pump unit with both photovoltaic and mains power. Background Technology

[0002] Currently, air source heat pump units, heating units, or pool heat pumps generally cannot effectively integrate with the peak and off-peak electricity prices of the national power grid or household photovoltaic power for coordinated control, thus failing to achieve energy saving and cost reduction. How to enable air source heat pumps to adopt appropriate control strategies based on the peak and off-peak electricity prices of the national power grid, and how to make greater use of photovoltaic power generation to drive the heat pump, thereby reducing operating costs, have become challenging issues for the industry. Existing air source heat pump systems do not effectively combine customer needs to achieve multi-purpose functionality, and they lack thermal and cold storage capabilities, failing to effectively combine the overall energy needs of the household with heat and cooling capacity to create an optimal operating plan, thus failing to achieve the best cost-saving and energy-saving goals. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a dual-source heat pump unit with both photovoltaic and mains power, possessing multi-purpose attributes to meet the needs of home heating, air conditioning, hot water, and swimming pool heating. It features a peak-valley electricity control strategy, which can adjust its operating logic according to the peak and off-peak electricity prices of the national grid during cloudy and rainy days. This maximizes the use of photovoltaic power generation to drive the air source heat pump and maximizes the use of off-peak electricity for heating and heat / cold storage, meeting customer heating needs while reducing operating costs, balancing grid load, and reducing carbon emissions. In various application scenarios, the heat pump unit can store heat in winter and cold in summer according to the needs and water temperature of home swimming pool customers, maximizing the use of photovoltaic power generation and off-peak electricity to store energy for heating and cooling requirements during cloudy and peak days.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: it is a dual-source heat pump unit with both photovoltaic and mains power, characterized by further comprising:

[0005] The compressor, photovoltaic power supply, and mains power supply are provided; the power input terminal of the compressor is electrically connected to the photovoltaic power supply and the mains power supply, respectively.

[0006] An air heat exchanger, a first four-way reversing valve, a second four-way reversing valve, and a second check valve; the first four-way reversing valve and the second four-way reversing valve are respectively provided with port a, port b, port c and port d. Port a of the second four-way reversing valve is connected to the refrigerant outlet of the compressor, port b of the second four-way reversing valve is connected to a refrigerant port of the air heat exchanger, port c of the second four-way reversing valve is connected to the inlet of the second check valve, and port d of the second four-way reversing valve is connected to port a of the first four-way reversing valve.

[0007] User-end load, first check valve, fourth shut-off valve and fifth shut-off valve; port b of the first four-way reversing valve is connected to a refrigerant port of the fourth shut-off valve and a refrigerant port of the fifth shut-off valve respectively, port c of the first four-way reversing valve is connected to the inlet of the first check valve, and port d of the first four-way reversing valve is connected to a refrigerant port of the load.

[0008] A gas-liquid separator; the gas-liquid separator has two refrigerant inlets and one refrigerant outlet, one refrigerant inlet of the gas-liquid separator is connected to the outlet of a first one-way valve, the other refrigerant inlet of the gas-liquid separator is connected to the outlet of a second one-way valve, and the refrigerant outlet of the gas-liquid separator is connected to the refrigerant inlet of the compressor.

[0009] The system comprises a liquid storage tank, a first electronic expansion valve, a first shut-off valve, a second electronic expansion valve, a second shut-off valve, a third electronic expansion valve, and a third shut-off valve. The liquid storage tank has ports a, b, and c. Port a is connected to a refrigerant port of both the first electronic expansion valve and the first shut-off valve. Port b is connected to a refrigerant port of both the second electronic expansion valve and the second shut-off valve. Port c is connected to a refrigerant port of both the third electronic expansion valve and the third shut-off valve. The other refrigerant ports of the first electronic expansion valve and the first shut-off valve are connected to another refrigerant port of an air heat exchanger. The other refrigerant ports of the third electronic expansion valve and the third shut-off valve are connected to another refrigerant port of the load.

[0010] A swimming pool and a hot water heat exchanger; one refrigerant port of the swimming pool is connected to another refrigerant port of the fifth shut-off valve, one refrigerant port of the hot water heat exchanger is connected to another refrigerant port of the fourth shut-off valve, and the other refrigerant ports of the swimming pool and the hot water heat exchanger are respectively connected to the other refrigerant ports of the second electronic expansion valve and the second shut-off valve.

[0011] The advantages of this invention compared to the prior art are: it has the function of waste heat recovery, which can recover the heat of the condenser for use in hot water or swimming pools; the condensation temperature is lower, the throttling temperature is reduced, and cold water with a lower temperature is produced. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the refrigerant flow path of this utility model. Detailed Implementation

[0013] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0014] like Figure 1 As shown, it is a dual-source heat pump unit with both photovoltaic and mains power, including:

[0015] The compressor 19, the photovoltaic power supply 20, and the mains power supply 21 are respectively connected to the power input terminal of the compressor 19 and the photovoltaic power supply 20 and the mains power supply 21.

[0016] Air heat exchanger 1, first four-way reversing valve 14, second four-way reversing valve 18, and second one-way valve 13; the first four-way reversing valve 14 and the second four-way reversing valve 18 are respectively provided with port a, port b, port c and port d. Port a of the second four-way reversing valve 18 is connected to the refrigerant outlet of the compressor 19, port b of the second four-way reversing valve 18 is connected to a refrigerant port of the air heat exchanger 1, port c of the second four-way reversing valve 18 is connected to the inlet of the second one-way valve 13, and port d of the second four-way reversing valve 18 is connected to port a of the first four-way reversing valve 14.

[0017] User terminal load 10, first check valve 11, fourth shut-off valve 16 and fifth shut-off valve 17; port b of the first four-way reversing valve 14 is connected to a refrigerant port of the fourth shut-off valve 16 and a refrigerant port of the fifth shut-off valve 17 respectively, port c of the first four-way reversing valve 14 is connected to the inlet of the first check valve 11, and port d of the first four-way reversing valve 14 is connected to a refrigerant port of the load 10;

[0018] Gas-liquid separator 12; the gas-liquid separator 12 has two refrigerant inlets and one refrigerant outlet. One refrigerant inlet of the gas-liquid separator 12 is connected to the outlet of the first one-way valve 11, the other refrigerant inlet of the gas-liquid separator 12 is connected to the outlet of the second one-way valve 13, and the refrigerant outlet of the gas-liquid separator 12 is connected to the refrigerant inlet of the compressor 19.

[0019] The system comprises a liquid storage tank 9, a first electronic expansion valve 2, a first shut-off valve 3, a second electronic expansion valve 5, a second shut-off valve 6, a third electronic expansion valve 7, and a third shut-off valve 8. The liquid storage tank 9 has ports a, b, and c. Port a is connected to a refrigerant port of the first electronic expansion valve 2 and a refrigerant port of the first shut-off valve 3. Port b is connected to a refrigerant port of the second electronic expansion valve 5 and a refrigerant port of the second shut-off valve 6. Port c is connected to a refrigerant port of the third electronic expansion valve 7 and a refrigerant port of the third shut-off valve 8. The other refrigerant ports of the first electronic expansion valve 2 and the first shut-off valve 3 are connected to the other refrigerant ports of the air heat exchanger 1. The other refrigerant ports of the third electronic expansion valve 7 and the third shut-off valve 8 are connected to the other refrigerant ports of the load 10.

[0020] Swimming pool 4 and hot water heat exchanger 15; one refrigerant port of swimming pool 4 is connected to the other refrigerant port of fifth shut-off valve 17, one refrigerant port of hot water heat exchanger 15 is connected to the other refrigerant port of fourth shut-off valve 16, and the other refrigerant ports of swimming pool 4 and hot water heat exchanger 15 are respectively connected to the other refrigerant ports of second electronic expansion valve 5 and second shut-off valve 6.

[0021] The load 10 provides heat to the user for heating or provides cooling to the user's air conditioning.

[0022] The hot water heat exchanger 15 provides heat to hot water for use by end users;

[0023] Pool 4 is a heated pool that adjusts its temperature based on the ambient temperature.

[0024] During operation, the structure includes the following control modes:

[0025] ① Hot water mode

[0026] When compressor 19 is working, the refrigerant of compressor 19 passes through port a of the second four-way reversing valve 18, port d of the second four-way reversing valve 18, port a of the first four-way reversing valve 14, port b of the first four-way reversing valve 14, fourth shut-off valve 16, hot water heat exchanger 15, second shut-off valve 6, port b of liquid storage tank 9, port a of liquid storage tank 9, first electronic expansion valve 2, air heat exchanger 1, port b of the second four-way reversing valve 18, port c of the second four-way reversing valve 18, second check valve 13, another refrigerant port of gas-liquid separator 12, and refrigerant outlet of gas-liquid separator 12 before returning to compressor 19.

[0027] ② Chilled water air conditioning mode

[0028] When compressor 19 is working, the refrigerant of compressor 19 passes through port a of the second four-way reversing valve 18, port b of the second four-way reversing valve 18, air heat exchanger 1, first shut-off valve 3, port a of liquid receiver 9, port c of liquid receiver 9, third electronic expansion valve 7, load 10, port d of the first four-way reversing valve 14, port c of the first four-way reversing valve 14, first check valve 11, refrigerant port of gas-liquid separator 12, and refrigerant outlet of gas-liquid separator 12 before returning to compressor 19.

[0029] ③ Hot water and air conditioning modes

[0030] When compressor 19 is working, the refrigerant of compressor 19 passes through port a of second four-way reversing valve 18, port d of second four-way reversing valve 18, port a of first four-way reversing valve 14, port b of first four-way reversing valve 14, fourth shut-off valve 16, hot water heat exchanger 15, second shut-off valve 6, port b of liquid storage tank 9, port c of liquid storage tank 9, third electronic expansion valve 7, load 10, port d of first four-way reversing valve 14, port c of first four-way reversing valve 14, first check valve 11, refrigerant port of gas-liquid separator 12, and refrigerant outlet of gas-liquid separator 12 before returning to compressor 19.

[0031] ④ Pool heating and heat storage mode

[0032] When compressor 19 is working, the refrigerant of compressor 19 passes through port a of the second four-way reversing valve 18, port d of the second four-way reversing valve 18, port a of the first four-way reversing valve 14, port b of the first four-way reversing valve 14, fifth shut-off valve 17, refrigerant flow path of pool 4, second shut-off valve 6, port b of liquid storage tank 9, port a of liquid storage tank 9, first electronic expansion valve 2, air heat exchanger 1, port b of the second four-way reversing valve 18, port c of the second four-way reversing valve 18, second check valve 13, another refrigerant port of gas-liquid separator 12, and refrigerant outlet of gas-liquid separator 12 before returning to compressor 19.

[0033] ⑤ Pool cooling and cold storage mode

[0034] When compressor 19 is working, the refrigerant of compressor 19 passes through port a of the second four-way reversing valve 18, port b of the second four-way reversing valve 18, air heat exchanger 1, first shut-off valve 3, port a of liquid receiver 9, port b of liquid receiver 9, second electronic expansion valve 5, refrigerant flow path of pool 4, fifth shut-off valve 17, port b of the first four-way reversing valve 14, port c of the first four-way reversing valve 14, first check valve 11, refrigerant port of gas-liquid separator 12, and refrigerant outlet of gas-liquid separator 12 before returning to compressor 19.

[0035] ⑥ Swimming pool thermal storage heating mode

[0036] When compressor 19 is working, the refrigerant of compressor 19 passes through port a of the second four-way reversing valve 18, port d of the second four-way reversing valve 18, port a of the first four-way reversing valve 14, port d of the first four-way reversing valve 14, load 10, third shut-off valve 8, port c of liquid receiver 9, port b of liquid receiver 9, second electronic expansion valve 5, refrigerant flow path of pool 4, fifth shut-off valve 17, port b of the first four-way reversing valve 14, port c of the first four-way reversing valve 14, first check valve 11, refrigerant port of gas-liquid separator 12, and refrigerant outlet of gas-liquid separator 12 before returning to compressor 19.

[0037] ⑦ Pool swimming cooling air conditioning mode

[0038] When compressor 19 is working, the refrigerant of compressor 19 passes through port a of the second four-way reversing valve 18, port d of the second four-way reversing valve 18, port a of the first four-way reversing valve 14, port b of the first four-way reversing valve 14, fifth shut-off valve 17, refrigerant flow path of pool 4, second shut-off valve 6, port b of liquid receiver 9, port c of liquid receiver 9, third electronic expansion valve 7, load 10, port d of the first four-way reversing valve 14, port c of the first four-way reversing valve 14, first check valve 11, refrigerant port of gas-liquid separator 12, and refrigerant outlet of gas-liquid separator 12 before returning to compressor 19.

[0039] In the above seven modes, the photovoltaic power source 20 and the mains power source 21 provide operating power to the compressor 19 according to the actual situation, and the power supply method is as follows:

[0040] When the season is winter and the electricity price is in a low period, and the customer load 10 has no heat load demand, the unit will operate in the off-peak electricity energy storage mode. The stored heat is in pool 4, and the mode is operated according to the pool heating and heat storage mode until the off-peak electricity time ends.

[0041] When the season is summer and the electricity price is in a low period, and the customer load 10 has no cooling load or hot water demand, the unit will operate in the off-peak electricity energy storage mode. The stored cooling capacity is in pool 4. The mode is according to the pool cooling and storage mode. The condition for this mode to be activated is that the water temperature value T1 of pool 4 is greater than the customer's pool 4 set value before the storage is activated. After storing the cooling capacity, the water temperature of pool 4 is not lower than the customer's pool 4 set water temperature of 0℃ to -3℃, so as not to affect the customer's user experience.

[0042] When the season is winter and the electricity price is at its lowest point, and the customer load 10 has a heat load demand, the unit will directly operate according to the above hot water mode or swimming pool thermal storage heating mode.

[0043] When the season is summer and the electricity price is at its lowest point, and the customer load 10 has a demand for cooling or hot water, the unit will operate in chilled water air conditioning mode, hot water and air conditioning mode, or hot water mode.

[0044] When the season is winter and the electricity price is at its peak or peak period, and the customer load has no heat load demand, the unit does not store off-peak electricity energy and the unit is in standby mode.

[0045] During winter, when electricity prices are at their peak or peak hours, and customer load 10 has a heat load demand, the system determines the current pool water temperature T1 and ambient temperature T2. If T1 > T2, the unit enters the pool thermal storage heating mode; if T1 ≤ T2, the unit enters the pool thermal storage heating mode. The hot water mode is not affected by this and is activated according to customer demand.

[0046] During summer, when electricity prices are at their peak or at their lowest point, and customer load 10 has a cooling load demand, the system determines the current pool water temperature T1 and ambient temperature T2. If T1 < T2, the unit enters the pool cooling storage air conditioning mode; if T1 ≥ T2, the unit enters the chilled water air conditioning mode. The hot water mode is not affected by this and is activated according to customer demand.

[0047] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations of these embodiments without departing from the principles and spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A dual-source heat pump unit with photovoltaic and mains power, characterized in that Also include: Compressor (19), photovoltaic power supply (20) and mains power supply (21); the power input end of the compressor (19) is electrically connected with photovoltaic power supply (20) and mains power supply (21) respectively; Air heat exchanger (1), first four-way reversing valve (14), second four-way reversing valve (18), second check valve (13); a mouth, b mouth, c mouth and d mouth are respectively arranged on the first four-way reversing valve (14) and the second four-way reversing valve (18), the a mouth of the second four-way reversing valve (18) is communicated with the refrigerant outlet of the compressor (19), the b mouth of the second four-way reversing valve (18) is communicated with a refrigerant port of the air heat exchanger (1), the c mouth of the second four-way reversing valve (18) is communicated with the inlet of the second check valve (13), and the d mouth of the second four-way reversing valve (18) is communicated with the a mouth of the first four-way reversing valve (14); User terminal load (10), first check valve (11), fourth stop valve (16) and fifth stop valve (17); the b mouth of the first four-way reversing valve (14) is communicated with a refrigerant port of the fourth stop valve (16) and a refrigerant port of the fifth stop valve (17) respectively, the c mouth of the first four-way reversing valve (14) is communicated with the inlet of the first check valve (11), and the d mouth of the first four-way reversing valve (14) is communicated with a refrigerant port of the load (10); Gas-liquid separator (12); the gas-liquid separator (12) has two refrigerant inlets and one refrigerant outlet, one refrigerant inlet of the gas-liquid separator (12) is communicated with the outlet of the first check valve (11), the other refrigerant inlet of the gas-liquid separator (12) is communicated with the outlet of the second check valve (13), and the refrigerant outlet of the gas-liquid separator (12) is communicated with the refrigerant inlet of the compressor (19); Liquid storage tank (9), first electronic expansion valve (2), first stop valve (3), second electronic expansion valve (5), second stop valve (6), third electronic expansion valve (7) and third stop valve (8); the liquid storage tank (9) has a mouth, b mouth and c mouth, the a mouth of the liquid storage tank (9) is communicated with a refrigerant port of the first electronic expansion valve (2) and a refrigerant port of the first stop valve (3) respectively, the b mouth of the liquid storage tank (9) is communicated with a refrigerant port of the second electronic expansion valve (5) and a refrigerant port of the second stop valve (6) respectively, the c mouth of the liquid storage tank (9) is communicated with a refrigerant port of the third electronic expansion valve (7) and the third stop valve (8) respectively, the other refrigerant port of the first electronic expansion valve (2) and the other refrigerant port of the first stop valve (3) are communicated with the other refrigerant port of the air heat exchanger (1) respectively, and the other refrigerant port of the third electronic expansion valve (7) and the other refrigerant port of the third stop valve (8) are communicated with the other refrigerant port of the load (10) respectively; and The pool (4) and the hot water heat exchanger (15); the refrigerant port of the pool (4) is communicated with the other refrigerant port of the fifth stop valve (17), the refrigerant port of the hot water heat exchanger (15) is communicated with the other refrigerant port of the fourth stop valve (16), the other refrigerant port of the pool (4) and the other refrigerant port of the hot water heat exchanger (15) are communicated with the other refrigerant port of the second electronic expansion valve (5) and the other refrigerant port of the second stop valve (6) respectively.

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