CN106839217B - Combined heat pump air conditioning system capable of independently operating in de-electrification mode and control method thereof - Google Patents

Abstract

The invention discloses a de-electrified independently-operated combined type heat pump air conditioning system and a control method thereof. The problem that the operation stability of an existing air-conditioning heat pump system is poor is solved. The air source heat pump system based on photovoltaic photo-thermal utilization provides cold and heat for a building by taking mechanical energy output by an internal combustion engine as input energy; and a photoelectric plate of the photovoltaic heat exchanger is sequentially connected with the inverter controller and the storage battery through a circuit to form a power generation system to supply power to the system. The waste heat recovery system adopts two waste heat utilization modes, and when the system operates in winter, the waste heat is used as a high-temperature heat source to further heat the backwater of the system; when the lithium bromide absorption refrigerating unit operates in summer, the waste heat is used as a driving heat source of the lithium bromide absorption refrigerating unit. The invention is a novel green high-efficiency heat pump air-conditioning system with high energy utilization rate, small environmental pollution, low operation cost and stable operation.

Description

De-electricity independent operation compound heat pump air conditioning system and its control method

technical field

The invention belongs to the technical field of air-conditioning energy-saving equipment, and in particular relates to an off-power independent operation composite heat pump air-conditioning system and a control method thereof.

Background technique

With the continuous improvement of people's living standards, people have higher and higher requirements for the comfort and cleanliness of living and working environments. Therefore, buildings in most areas of our country have multiple needs for heating in winter, air conditioning in summer and domestic hot water throughout the year. Although electric heat pumps use various advanced energy-saving technologies in the cooling and heating sources and systems, they have higher However, since most of my country's grid electricity is supplied by coal-fired power plants, increasing electrical equipment is basically equivalent to increasing environmental pollution. Therefore, it is necessary to promote the use of other energy sources from the perspective of improving atmospheric environmental quality and reducing greenhouse gas emissions. Building cooling and heating system. The internal combustion engine heat pump air conditioning system with natural gas or other fuels as input energy has many advantages such as high efficiency, energy saving, safety, and environmental protection, and has received widespread attention.

For the auxiliary equipment of the conventional gas heat pump system, such as fans, water pumps, control instruments, etc., still need to consume a small amount of power supply, these power must be provided by the grid, so the system cannot operate independently from the grid, once the power supply is interrupted due to the shortage of power supply. It will also be paralyzed like the electric air conditioner. Therefore, the independent operation of the gas heat pump system has become the focus of attention. Judging from the currently published information, the independent operation of the gas heat pump system can be realized in the following ways: 1. The gas engine drives the generator to realize the independent operation of the system [CN201310010199.1], because the gas engine heat pump system needs to operate according to the load The speed of the engine is changed and adjusted, so there is a contradiction between the system capacity adjustment and the constant speed of the generator. At the same time, due to the relatively low power generation efficiency of the generator, the energy waste is relatively large; 2. The use of solar photovoltaic power generation to achieve independent operation of the system [CN201310365773.5], since most of the solar radiation absorbed by the solar cell is not converted into electrical energy, but increases the temperature of the battery, and the increase of the battery temperature reduces the photoelectric conversion efficiency of the solar cell, so this method exists. The contradiction between photoelectric conversion efficiency and battery temperature rise; at the same time, due to the high power of the gas heat pump end water pump, the power consumption is large, and the solar power generation is greatly affected by the external environment, so it is difficult to ensure that the system is completely independent of the power grid; 3 .Comprehensive utilization of photoelectric light and heat to realize the independent operation of the system [CN 201410222276.4], the patent only describes the method of comprehensive utilization of photoelectric light and heat in winter heating, and does not provide the utilization method of light heat and photoelectric for cooling in summer, which has certain limitations .

A very important aspect of the research on gas heat pump technology is waste heat utilization technology. At present, the waste heat utilization of gas heat pump is mainly used for heating or providing domestic hot water, but in hot summer, heating is not required and the demand for hot water Relatively few, so a large amount of waste heat cannot be used effectively, and energy waste is very serious. Therefore, it is of great significance to solve the problems of improving the utilization rate of waste heat of the gas heat pump system, reducing the burden on the power system, and improving the utilization efficiency of solar photovoltaics in winter and summer.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above problems, to provide a de-electricity independent operation composite heat pump air conditioning system that organically combines the solar photovoltaic photothermal utilization technology, the internal combustion engine heat pump technology, the absorption refrigeration technology and the multi-stage transmission technology.

Another object of the present invention is to address the above problems, to provide an off-power and independent operation composite heat pump air conditioning system with a high degree of automation and independent operation of off-power.

In order to achieve the above object, the present invention adopts the following technical solutions: the de-powering and independent operation compound heat pump air conditioning system is characterized in that, the system includes a compressor, and the outlet end of the compressor is connected with the four-way through a pipeline in sequence. The reversing valve, the plate heat exchanger and the electronic expansion valve are connected, and a photovoltaic photothermal utilization system and a heat pump air conditioning system are respectively connected to the outlet pipeline of the electronic expansion valve, and the heat pump air conditioning system includes the photovoltaic heat exchange connected in parallel with each other. The photovoltaic thermal utilization system includes an inverter controller connected to the photovoltaic heat exchanger, and the inverter controller is connected to the power consumption side through a battery, and the compressor The first electromagnetic clutch transmission is connected with the multi-stage mechanical transmission mechanism, and the multi-stage mechanical transmission mechanism is connected with the internal combustion engine. The system also includes a waste heat recovery system, and the waste heat recovery system includes a heat exchanger connected to the plate heat exchanger. The user side return water pipeline is connected with a first return water pipeline and a second return water pipeline respectively.

In the above-mentioned de-powering and independent operation compound heat pump air conditioning system, the outlet pipeline of the electronic expansion valve is divided into two paths; The other way of the electronic expansion valve is connected to the refrigerant pipeline of the photovoltaic heat exchanger and the second solenoid valve; the outlet of the first solenoid valve and the outlet of the second solenoid valve are connected by pipelines and then connected to the four-way valve in turn. A reversing valve, and the four-way reversing valve is connected to the compressor inlet.

In the above-mentioned de-energized and independent operation compound heat pump air conditioning system, the cooling water pipeline of the photovoltaic heat exchanger is connected to the seventh cut-off valve, the hot water storage tank and the eighth cut-off valve in sequence through pipes to form a cooling water circuit. The refrigerant circuit of the photovoltaic heat exchanger is respectively connected with the fin-tube heat exchanger and the second solenoid valve through refrigerant pipes.

In the above-mentioned de-power-independent operation composite heat pump air conditioning system, the first return water pipeline includes a plate heat exchanger and a user-side circulating water pump which are sequentially connected to the user-side return water pipeline through pipes, and the user-side circulating water pump The outlet pipeline of the water pump is divided into two paths; the user-side circulating water pump is connected to the ninth stop valve and the tenth globe valve through a pipeline; the user-side circulating water pump is connected to the The first cut-off valve is connected; the outlet of the first cut-off valve is divided into two paths; the first cut-off valve is connected to the cylinder jacket water heat exchanger, the flue gas heat exchanger and the second cut-off valve in sequence through pipes, The first cut-off valve is connected with a high-temperature water circuit of the lithium bromide refrigeration unit in another way, and the high-temperature water circuit of the lithium bromide refrigeration unit includes a fifth cut-off valve, a high-temperature water pump and a lithium bromide refrigeration unit that are sequentially connected with the first cut-off valve through a pipeline. The high temperature pipeline of the unit, the high temperature pipeline of the lithium bromide refrigeration unit is sequentially connected with the high temperature water tank, the sixth stop valve and the flue gas heat exchanger.

In the above-mentioned de-powering and independent operation compound heat pump air conditioning system, the second return water pipeline includes a refrigerated water circuit of the lithium bromide refrigeration unit connected to the user side return pipeline, and the refrigerated water circuit of the lithium bromide refrigeration unit includes a The third cut-off valve connected to the user-side return water pipeline is connected to the fourth cut-off valve and the second cut-off valve outlet pipeline in turn through the chilled water pipeline of the lithium bromide refrigeration unit.

In the above-mentioned de-electricity independent operation composite heat pump air conditioning system, the lithium bromide refrigeration unit is connected with a cooling water circuit of the lithium bromide refrigeration unit, and the cooling water circuit of the lithium bromide refrigeration unit includes a cooling water pipeline connected with the cooling water pipeline of the lithium bromide refrigeration unit. The cooling water pump is connected with the air cooling tower.

In the above-mentioned de-power-independent operation compound heat pump air-conditioning system, the user-side circulating water pump, cooling water water pump and high-temperature water water pump pass through the second electromagnetic clutch transmission, the third electromagnetic clutch transmission, the fourth electromagnetic clutch transmission and the multiple electromagnetic clutch transmissions respectively. The level mechanical transmission mechanism is connected, and the start-stop control and speed control of the user-side circulating water pump, the cooling water pump and the high-temperature water pump are all controlled by the electromagnetic clutch transmission.

In the above-mentioned de-electricity independent operation compound heat pump air conditioning system, the photovoltaic heat exchanger includes a first aluminum alloy plate and a second aluminum alloy plate arranged in parallel with each other, and the cooling water pipeline of the photovoltaic heat exchanger and the The refrigerant circuit is alternately arranged between the first aluminum alloy plate and the second aluminum alloy plate, and one side of the first aluminum alloy plate is sequentially provided with a plurality of photoelectric glass plates through thermal conductive glue, and the second aluminum alloy plate is provided with a plurality of photoelectric glass plates in turn. The outer surface of the plate is provided with a layer of heat insulating material.

In the above-mentioned de-electricity independent operation composite heat pump air conditioning system, the cross-sections of the cooling water pipeline and the refrigerant circuit are square, and the cooling water pipeline and the refrigerant circuit are not connected to each other.

The control method for the de-electricity and independent operation of the compound heat pump air-conditioning system based on the above-mentioned de-electricity and independent operation of the compound heat pump air-conditioning system is as follows: The control method for the de-electricity and independent operation of the compound heat pump air-conditioning system includes the following steps:

A. Winter operation: The photovoltaic heat exchanger and the fin-tube heat exchanger are used in parallel. The photovoltaic panels on the surface of the photovoltaic heat exchanger absorb sunlight to generate electricity, a part of which is stored in the battery as electricity, and the other part supplies power to the system. The waste heat recovery system The waste heat is used as a high temperature heat source to further heat the return water of the system, and the waste heat recovery system provides the system water supply temperature;

B. Operation in summer: The photovoltaic heat exchanger is only used for power generation and not for heat exchange. The finned tube heat exchanger is used as a condenser. The waste heat recovery system uses the waste heat and waste heat as the driving heat source of the waste heat recovery system, and converts heat into cold energy to User side cooling.

Compared with the prior art, the advantages of the present invention are:

1. The present invention operates in winter, when the solar radiation intensity is good, on the one hand, the photovoltaic heat exchanger absorbs solar power to supply power to the system, and at the same time, the excess electricity is stored in the battery for use in rainy weather and at night. When the refrigerant flows through the photovoltaic heat exchanger, it absorbs the heat generated by the solar cell power generation as the low-temperature heat source of the heat pump system, increases the evaporation temperature of the evaporator, and is beneficial to improve the energy efficiency ratio of the heat pump system. The electric three-way valve is automatically switched, and the finned tube heat exchanger is used to absorb the heat in the outdoor air as a low-temperature heat source to supply heat to the user side.

2. When the present invention operates in summer, the electric three-way valve is automatically switched, the finned tube heat exchanger is used to discharge the indoor heat into the outdoor air, and the valve on the side of the heat storage tank of the photovoltaic heat exchanger is opened at the same time. The natural circulation takes away the heat generated by the photovoltaic heat exchanger due to power generation, which not only improves the photoelectric conversion efficiency of photovoltaic cells, but also can store the heat in the hot water storage tank as domestic hot water.

3. In order to reduce the power consumption of the electrical equipment of the system and ensure that the system can operate completely independently of the power grid, the present invention adopts a multi-stage mechanical transmission mechanism, and the driving power of all water pumps in the system is provided by the internal combustion engine, and the power generation system is only used for the control system and The finned tube heat exchanger fan provides the small amount of power required, greatly reducing the power consumption of the system. At the same time, the start and stop of each water pump in the system and the speed and flow control are controlled by the electromagnetic clutch transmission to achieve optimal energy distribution.

4. For the utilization of the waste heat of the internal combustion engine, it is used as a high temperature heat source to further heat the return water of the system in winter; in summer, it is used to drive the lithium bromide absorption refrigeration unit to supply cooling to the end, which not only maximizes the utilization efficiency of the waste heat of the internal combustion engine heat pump, saves energy, but also It can also optimally match the load of the system in winter and summer, reduce the design capacity of the unit, and save the investment cost.

Description of drawings

Fig. 1 is the structural representation of the present invention;

2 is a structural cross-sectional view of the photovoltaic heat exchanger of the present invention;

In the figure, compressor 1, plate heat exchanger 2, electronic expansion valve 3, finned tube heat exchanger 4, four-way reversing valve 5, photovoltaic heat exchanger 6, photoelectric glass plate 61, first aluminum alloy plate 62 , the second aluminum alloy plate 63, the insulating material layer 64, the cooling water pipeline 65, the refrigerant circuit 66, the inverter controller 7, the battery 8, the air cooling tower 9, the first solenoid valve 10, the second solenoid valve 11, the internal combustion engine 12 , liner water heat exchanger 13, flue gas heat exchanger 14, lithium bromide refrigeration unit 15, user side circulating water pump 16, cooling water water pump 17, high temperature water water pump 18, multi-stage mechanical transmission mechanism 19, first electromagnetic clutch transmission 20 , the second electromagnetic clutch transmission 21, the third electromagnetic clutch transmission 22, the fourth electromagnetic clutch transmission 23, the high temperature water tank 24, the hot water storage tank 25, the first shut-off valve 26, the second shut-off valve 27, the third shut-off valve 28, The fourth shut-off valve 29 , the fifth shut-off valve 30 , the sixth shut-off valve 31 , the seventh shut-off valve 32 , the eighth shut-off valve 33 , the ninth shut-off valve 34 , and the tenth shut-off valve 35 .

Detailed ways

As shown in Fig. 1 and Fig. 2, this de-power and independent operation compound heat pump air-conditioning system includes a compressor 1, and the outlet end of the compressor 1 is connected to the four-way reversing valve 5, the plate heat exchanger 2 and the The electronic expansion valve 3 is connected, and a photovoltaic photothermal utilization system and a heat pump air conditioning system are respectively connected to the outlet pipeline of the electronic expansion valve 3. The heat pump air conditioning system includes a photovoltaic heat exchanger 6 and a fin-tube heat exchanger 4 connected in parallel with each other. The heat utilization system includes an inverter controller 7 connected to the photovoltaic heat exchanger 6 , the inverter controller 7 is connected to the power consumption side through the battery 8 , and the compressor 1 is connected to the multi-stage mechanical transmission mechanism 19 through the first electromagnetic clutch transmission 20 . , and the multi-stage mechanical transmission mechanism 19 is connected with the internal combustion engine 12, the system also includes a waste heat recovery system, and the waste heat recovery system includes a user-side return water pipeline connected to the plate heat exchanger 2, and the user-side return water pipelines are respectively connected with A return water pipeline and a second return water pipeline, the heat pump air conditioning system is composed of two outdoor heat exchangers in parallel, one is the photovoltaic heat exchanger 6 and the other is the finned tube heat exchanger 4 . When running in winter, two heat exchangers are used in parallel, and the refrigerant flow through the two heat exchangers is controlled by a solenoid valve according to the superheat of the outlet refrigerant; when running in summer, the photovoltaic heat exchanger 6 is only used for power generation and not for exchange. For heat use, the finned tube heat exchanger 4 is used as a condenser. Among them, the waste heat recovery system here adopts two waste heat utilization methods. During operation in winter, the waste heat is used as a high temperature heat source to further heat the return water of the system and provide the system water supply temperature. Reduce the water supply flow, thereby reducing the power consumption of the pump and saving energy; in summer operation, the waste heat is used as the driving heat source of the lithium bromide absorption refrigeration unit, and the heat is converted into cold energy to supply cooling to the user side, which not only maximizes the use of waste heat, but also reduces heat pump The cooling capacity of the system can effectively save energy, and the condensation heat and absorption heat generated by the system are cooled by the air cooler and discharged into the outdoor atmosphere.

Among them, the outlet pipeline of the electronic expansion valve 3 here is divided into two channels; the electronic expansion valve 3 is connected to the finned tube heat exchanger 4 and the first solenoid valve 10 on one route; the electronic expansion valve 3 is connected to the photovoltaic heat exchanger 6 on the other route. The refrigerant pipeline is connected to the second solenoid valve 11; the outlet of the first solenoid valve 10 and the outlet of the second solenoid valve 11 are connected through pipelines and then connected to the four-way reversing valve 5 in turn, and the four-way reversing valve 5 is connected to the compressor 1 Imports are connected.

Here, the cooling water pipeline 65 of the photovoltaic heat exchanger 6 is connected to the seventh shut-off valve 32 , the hot water storage tank 25 and the eighth shut-off valve 33 in sequence through pipes to form a cooling water circuit, and the refrigerant circuit of the photovoltaic heat exchanger 6 66 is respectively connected to the finned tube heat exchanger 4 and the second solenoid valve 11 through the refrigerant pipeline, and the heat generated by the photoelectric glass plate due to power generation is used as the low temperature heat source of the heat pump system through the refrigerant heat exchange circuit; The heat generated by the glass due to power generation is absorbed by the water through the cooling water circuit, and the heat is stored in the hot water storage tank 25 for use as domestic hot water.

Among them, the first return water pipeline here includes the plate heat exchanger 2 and the user-side circulating water pump 16 which are sequentially connected to the user-side return water pipeline through the pipeline, and the outlet pipeline of the user-side circulating water pump 16 is divided into two paths; 16 is connected to the ninth cut-off valve 34 and the tenth cut-off valve 35 through a pipeline; the other way of the user-side circulating water pump 16 is connected to the first cut-off valve 26; the outlet of the first cut-off valve 26 is divided into two ways; The liner water heat exchanger 13, the flue gas heat exchanger 14 and the second shut-off valve 27 are connected to the cylinder jacket water heat exchanger 13, the flue gas heat exchanger 14 and the second shut-off valve 27 in sequence through pipes. The first shut-off valve 26 is connected to the high-temperature water circuit of the lithium bromide refrigeration unit in another way, and the high-temperature water circuit of the lithium bromide refrigeration unit includes: The fifth cut-off valve 30, the high-temperature water pump 18, and the high-temperature pipeline of the lithium bromide refrigeration unit 15 are sequentially connected to the first cut-off valve 26 through pipelines. And the flue gas heat exchanger 14 is connected, the high-temperature water pump 18, the cooling water pump 17, the compressor 1 and the user-side circulating water pump 16 are connected with the internal combustion engine 12 through the multi-stage mechanical transmission mechanism 9 and the electromagnetic clutch transmission, and are provided by the internal combustion engine 12. power.

The second return water pipeline here includes a chilled water circuit of the lithium bromide refrigeration unit connected to the user-side return water pipeline, and the chilled water circuit of the lithium bromide refrigeration unit includes a third stop valve 28 connected to the user-side return pipeline, and the third stop valve 28 The chilled water pipeline passing through the lithium bromide refrigeration unit 15 is sequentially connected to the outlet pipelines of the fourth shut-off valve 29 and the second shut-off valve 27 .

Preferably, the lithium bromide refrigeration unit 15 here is connected with a cooling water circuit of the lithium bromide refrigeration unit, and the cooling water circuit of the lithium bromide refrigeration unit includes a cooling water pump 17 connected to the cooling water pipeline 65 of the lithium bromide refrigeration unit 15, and the cooling water pump 17 is connected to the air cooling tower. 9 connected.

Here, the user-side circulating water pump 16 , the cooling water water pump 17 and the high-temperature water pump 18 are connected to the multi-stage mechanical transmission mechanism 19 through the second electromagnetic clutch transmission 21 , the third electromagnetic clutch transmission 22 and the fourth electromagnetic clutch transmission 23 respectively, and the user The start-stop control and speed control of the side circulating water pump 16 , the cooling water pump 17 and the high-temperature water pump 18 are all controlled by the electromagnetic clutch transmission.

As shown in FIG. 2 , the photovoltaic heat exchanger 6 here includes a first aluminum alloy plate 62 and a second aluminum alloy plate 63 arranged in parallel with each other, and the cooling water pipeline 65 and the refrigerant circuit 66 of the photovoltaic heat exchanger 6 are alternately arranged in sequence Between the first aluminum alloy plate 62 and the second aluminum alloy plate 63, and one side of the first aluminum alloy plate 62 is sequentially provided with a number of photoelectric glass plates 61 through thermally conductive glue, and the outer surface of the second aluminum alloy plate 63 is provided with a heat insulating material layer 64 to prevent heat loss. The cross-sections of the cooling water pipeline 65 and the refrigerant circuit 66 here are both square, and the cooling water pipeline 65 and the refrigerant circuit 66 do not communicate with each other.

The control method of the power-off and independent operation of the composite heat pump air-conditioning system includes the following steps:

A. Operation in winter: the photovoltaic heat exchanger 6 and the fin-tube heat exchanger 4 are used in parallel, and the photovoltaic panels on the surface of the photovoltaic heat exchanger 6 absorb sunlight to generate electricity, a part of which is stored in the battery 8 as electricity, and a part supplies power to the system , the waste heat recovery system uses the waste heat as a high temperature heat source to further heat the return water of the system, and the waste heat recovery system provides the system water supply temperature;

B. Operation in summer: Photovoltaic heat exchanger 6 is only used for power generation and not used as heat exchange, finned tube heat exchanger 4 is used as condenser, and the waste heat recovery system uses waste heat and waste heat as the driving heat source of the waste heat recovery system to convert heat into cold supply cooling to the user side.

The specific working process is as follows:

When the present invention operates in winter, the system is in the heating mode, and the third cut-off valve 28, the fourth cut-off valve 29, the fifth cut-off valve 30, the sixth cut-off valve 31, the seventh cut-off valve 32, the eighth cut-off valve 33, The ninth stop valve 34 and the tenth stop valve 35, open the first stop valve 26 and the second stop valve 27, disconnect the third electromagnetic clutch transmission 22 and the fourth electromagnetic clutch transmission 23, and close the first electromagnetic clutch transmission 20 and The second electromagnetic clutch transmission 21 and the four-way reversing valve 5 change directions, so that the plate heat exchanger 2 is a condenser, and the finned tube heat exchanger 4 or the photovoltaic heat exchanger 6 is an evaporator.

When the outdoor solar radiation intensity is strong and the heat absorbed by the photovoltaic heat exchanger meets the heating demand of the heat pump, the first solenoid valve 10 is closed, the second solenoid valve 11 is opened, and the internal combustion engine 12 drives the compressor 1 through the multi-stage mechanical transmission mechanism 19 In operation, the high temperature and high pressure refrigerant vapor releases heat in the plate heat exchanger 2 and condenses into a high temperature and high pressure liquid refrigerant. The high temperature and high pressure liquid refrigerant is throttled by the electronic expansion valve 3 and becomes a low temperature and low pressure gas-liquid two-phase refrigeration The low-temperature and low-pressure gas-liquid two-phase refrigerant enters the photovoltaic heat exchanger 6 and absorbs the heat generated by the solar photovoltaic panel to generate a low-temperature and low-pressure gaseous refrigerant vapor, and then enters the compressor 1 to be compressed into a high-temperature and high-pressure refrigerant vapor. The gaseous refrigerant forms a cycle. At the same time, the photovoltaic panels on the surface of the photovoltaic heat exchanger 6 absorb sunlight to generate electric energy, a part of which is stored in the battery 8 as electric energy, and the other part supplies power to the system.

The internal combustion engine 12 drives the user-side circulating water pump through the multi-stage mechanical transmission mechanism 19 to provide circulating power for the user-side circulating water, and the user-side return water passes through the plate heat exchanger 2 to absorb the condensation heat generated by the condensation of the high-temperature and high-pressure refrigerant, and the temperature rises After entering the cylinder jacket water heat exchanger 13 and the flue gas heat exchanger 14, it further absorbs the waste heat of the internal combustion engine to raise the temperature, and then supplies water to the user.

When the outdoor solar radiation intensity is weak and the heat absorbed by the photovoltaic heat exchanger cannot meet the heating demand of the heat pump, the first solenoid valve 10 and the second solenoid valve 11 are opened at the same time, and the first solenoid valve is automatically adjusted according to the superheat degree of the refrigerant at the outlet. The opening of the valve 10 and the second solenoid valve 11 makes a part of the refrigerant enter the photovoltaic heat exchanger 6 to absorb heat, and the other part of the refrigerant enters the fin-tube heat exchanger 4 to absorb the heat of the outdoor air, so as to ensure the normal operation of the heat pump system .

When the outdoor is rainy and at night, the first solenoid valve 10 is opened and the second solenoid valve 11 is closed. The heat pump system absorbs the heat of the outdoor air through the fin tube heat exchanger 4 to ensure the normal operation of the system.

When the present invention operates in summer, the system is in the cooling mode, the first shut-off valve 26 and the second shut-off valve 27 are closed, and the third shut-off valve 28, the fourth shut-off valve 29, the fifth shut-off valve 30, and the sixth shut-off valve 31 are opened. , the seventh shut-off valve 32 , the eighth shut-off valve 33 , the ninth shut-off valve 34 and the tenth shut-off valve 35 . The first electromagnetic clutch transmission 20, the second electromagnetic clutch transmission 21, the third electromagnetic clutch transmission 22 and the fourth electromagnetic clutch transmission 23 are closed, and the four-way reversing valve 5 is reversed, so that the plate heat exchanger 2 is an evaporator, and the fins The sheet-and-tube heat exchanger 2 is a condenser.

The internal combustion engine 12 drives the compressor 1 to run through the multi-stage mechanical transmission mechanism 19 and the first electromagnetic clutch transmission 20, and the high-temperature and high-pressure gaseous refrigerant enters the fin-tube heat exchanger 4 to release heat to the outdoor air and turns into a high-temperature and high-pressure liquid refrigeration. The high-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant after being throttled by electronic expansion 3, and the gas-liquid two-phase refrigerant enters the plate heat exchanger 2 to absorb heat and becomes a low-temperature and low-pressure gaseous refrigerant , and then enter the compressor to be compressed into a high temperature and high pressure gaseous refrigerant to form a cycle.

During the cooling operation in summer, the main function of the photovoltaic heat exchanger 6 is to use the photovoltaic panels to generate electricity, open the seventh stop valve 32 and the eighth stop valve 33 at the same time, and use the natural circulation of water to take away the heat generated by the photovoltaic panels. The photoelectric conversion efficiency of the photovoltaic panel is improved, and the heat is stored in the hot water storage tank 25 for use as domestic hot water.

The internal combustion engine 12 drives the user-side circulating water pump 16 through the multi-stage mechanical transmission mechanism 19 and the second electromagnetic clutch transmission 21 to provide circulating power for the user-side circulating water. After the low-temperature and low-pressure gas-liquid two-phase refrigerant is supplied, the temperature decreases, and the chilled water is supplied to the user side through the bypass pipe where the ninth cut-off valve 34 and the tenth cut-off valve 35 are located; the other way enters the lithium bromide absorption through the third cut-off valve 28 The chilled water pipeline of the type refrigerating unit 15 will supply chilled water to the user through the fourth shut-off valve 29 after the temperature of the heat released is reduced.

The cooling water circuit of the lithium bromide refrigeration unit is mainly used to cool the absorption heat and condensation heat of the solution inside the lithium bromide refrigeration unit. In the air cooling tower 9, the absorbed heat is released to the air for cooling and then re-enters the cooling water pump 17 to form a cooling cycle. The internal combustion engine 12 drives the cooling water pump through the multi-stage mechanical transmission mechanism 19 to provide circulating power for the cooling water.

The driving heat source of the lithium bromide absorption refrigeration unit 15 mainly comes from the waste heat recovered by the internal combustion engine. The medium temperature water flowing out from the high temperature pipeline of the lithium bromide absorption refrigeration unit 15 enters the cylinder jacket water exchange through the high temperature water pump 18 and the fifth stop valve 30. Heater 13 and flue gas heat exchanger 14 absorb heat and turn into high-temperature water at about 90°C. The high-temperature water enters the lithium bromide absorption refrigeration unit after passing through the sixth stop valve 31 and the high-temperature water tank 24, and drives the lithium bromide refrigeration unit to run to release heat. It becomes medium-temperature water and re-enters the high-temperature water pump 18 to form a cycle. The internal combustion engine 12 drives the high-temperature water pump through the multi-stage mechanical transmission mechanism 19 and the fourth electromagnetic clutch transmission 23 to provide power for the high-temperature water cycle.

The present invention organically combines technologies such as solar energy storage technology, solar power generation technology, internal combustion engine combustion technology, absorption refrigeration technology, waste heat utilization technology, heat pump technology, heat exchange principle, automatic control and other technologies to realize system heating in winter and air conditioning in summer. At the same time, it maximizes the utilization efficiency of waste heat of the internal combustion engine heat pump and saves energy. It is a new type of green and efficient heat pump air conditioning system with high energy utilization, low environmental pollution, low operating cost and stable operation.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention pertains can make various modifications or additions to the described specific embodiments or substitute in similar manners, but will not deviate from the spirit of the present invention or go beyond the definitions of the appended claims range.

Although the compressor 1, the plate heat exchanger 2, the electronic expansion valve 3, the finned tube heat exchanger 4, the four-way reversing valve 5, the photovoltaic heat exchanger 6, the photovoltaic glass plate 61, the first Aluminum alloy plate 62, second aluminum alloy plate 63, heat insulating material layer 64, cooling water pipeline 65, refrigerant circuit 66, inverter controller 7, battery 8, air cooling tower 9, first solenoid valve 10, second solenoid valve 11. Internal combustion engine 12, liner water heat exchanger 13, flue gas heat exchanger 14, lithium bromide refrigeration unit 15, user side circulating water pump 16, cooling water water pump 17, high temperature water water pump 18, multi-stage mechanical transmission mechanism 19, the first Electromagnetic clutch transmission 20, second electromagnetic clutch transmission 21, third electromagnetic clutch transmission 22, fourth electromagnetic clutch transmission 23, high temperature water tank 24, hot water storage tank 25, first cut-off valve 26, second cut-off valve 27, third Globe valve 28, fourth stop valve 29, fifth stop valve 30, sixth stop valve 31, seventh stop valve 32, eighth stop valve 33, ninth stop valve 34, tenth stop valve 35 and other terms, but not The possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; it is contrary to the spirit of the present invention to interpret them as any kind of additional limitation.

Claims (5)

1. A composite heat pump air-conditioning system for de-powering and independent operation, characterized in that the system comprises a compressor (1), and the outlet end of the compressor (1) is connected to the four-way reversing valve (5), The plate heat exchanger (2) is connected to the electronic expansion valve (3), and a photovoltaic photothermal utilization system and a heat pump air conditioning system are respectively connected to the outlet pipeline of the electronic expansion valve (3), and the heat pump air conditioning system includes mutual A photovoltaic heat exchanger (6) and a fin-tube heat exchanger (4) are connected in parallel, and the photovoltaic photothermal utilization system includes an inverter controller (7) connected to the photovoltaic heat exchanger (6). The inverter controller (7) is connected to the power consumption side through the battery (8), the compressor (1) is connected to the multi-stage mechanical transmission mechanism (19) through the first electromagnetic clutch transmission (20), and the The multi-stage mechanical transmission mechanism (19) is connected to the internal combustion engine (12), the system further includes a waste heat recovery system, and the waste heat recovery system includes a user-side return water pipeline connected to the plate heat exchanger (2), and the The user-side return water pipeline is respectively connected with a first return water pipeline and a second return water pipeline; the outlet pipeline of the electronic expansion valve (3) is divided into two channels; the electronic expansion valve (3) one way is connected to the The finned-tube heat exchanger (4) is connected to the first solenoid valve (10); the other way of the electronic expansion valve (3) is connected to the refrigerant pipeline of the photovoltaic heat exchanger (6) and the second solenoid valve (11) connected; the outlet of the first solenoid valve (10) and the outlet of the second solenoid valve (11) are connected with the four-way reversing valve (5) in turn after being connected by pipelines, and the four-way reversing valve (5) It is connected to the inlet of the compressor (1); the cooling water pipeline (65) of the photovoltaic heat exchanger (6) is connected to the seventh shut-off valve (32), the hot water storage tank (25) and the seventh stop valve (32) and the water storage tank (25) through the pipeline in turn. Eight shut-off valves (33) are connected to form a cooling water circuit, and the refrigerant circuit (66) of the photovoltaic heat exchanger (6) is connected to the fin-tube heat exchanger (4) and the second solenoid valve (11) through refrigerant pipes, respectively. ) is connected; the first return water pipeline includes a plate heat exchanger (2) and a user-side circulating water pump (16) that are sequentially connected to the user-side return water pipeline through pipes, and the user-side circulating water pump (16) exits The pipeline is divided into two paths; the user side circulating water pump (16) is connected to the ninth globe valve (34) and the tenth globe valve (35) through pipelines on one path; the user side circulating water pump (16) has another path is connected to the first cut-off valve (26); the outlet of the first cut-off valve (26) is divided into two paths; the first cut-off valve (26) is connected to the cylinder jacket water heat exchanger (13) through the pipeline , the flue gas heat exchanger (14) and the second cut-off valve (27) are connected, and the first cut-off valve (26) is connected to the high temperature water circuit of the lithium bromide refrigeration unit in another way, and the high temperature water circuit of the lithium bromide refrigeration unit is connected. It comprises a fifth cut-off valve (30) connected to the first cut-off valve (26) through a pipeline, a high-temperature water pump (18), and a high-temperature pipeline of the lithium bromide refrigeration unit (15), and the lithium bromide refrigeration unit (15) has a high temperature pipeline. High temperature pipeline and high temperature water tank in turn (24), the sixth shut-off valve (31) and the flue gas heat exchanger (14) are connected; the second water return pipeline includes a lithium bromide refrigeration unit chilled water circuit connected to the user-side return pipeline, and the The chilled water circuit of the lithium bromide refrigeration unit includes a third shut-off valve (28) connected to the user-side return water pipeline, and the third shut-off valve (28) is connected to the fourth shut-off valve in sequence through the chilled water pipeline of the lithium bromide refrigeration unit (15). (29) is connected with the outlet pipeline of the second cut-off valve (27); the lithium bromide refrigeration unit (15) is connected with a cooling water circuit of the lithium bromide refrigeration unit, and the cooling water circuit of the lithium bromide refrigeration unit includes a lithium bromide refrigeration unit ( 15) The cooling water pump (17) connected to the cooling water pipeline (65), the cooling water pump (17) is connected to the air cooling tower (9). 2. The de-power-independent operation composite heat pump air conditioning system according to claim 1, wherein the user-side circulating water pump (16), the cooling water water pump (17) and the high-temperature water water pump (18) pass through the The second electromagnetic clutch transmission (21), the third electromagnetic clutch transmission (22), and the fourth electromagnetic clutch transmission (23) are connected to the multi-stage mechanical transmission mechanism (19), and the user-side circulating water pump (16), cooling water The start-stop control and speed control of the water pump (17) and the high-temperature water pump (18) are controlled by the electromagnetic clutch transmission. 3. The de-power-independent operation composite heat pump air conditioning system according to claim 1, wherein the photovoltaic heat exchanger (6) comprises a first aluminum alloy plate (62) and a second aluminum alloy plate (62) arranged in parallel to each other The alloy plate (63), the cooling water pipeline (65) and the refrigerant circuit (66) of the photovoltaic heat exchanger (6) are alternately arranged on the first aluminum alloy plate (62) and the second aluminum alloy plate (63) in turn. ), and one side of the first aluminum alloy plate (62) is sequentially provided with a number of photoelectric glass plates (61) through thermally conductive adhesive, and the outer surface of the second aluminum alloy plate (63) is provided with a layer of heat insulating material (64). 4. The de-powering and independent operation compound heat pump air-conditioning system according to claim 3, characterized in that the cross-sections of the cooling water pipeline (65) and the refrigerant circuit (66) are square, and the cooling water pipeline ( 65) and the refrigerant circuit (66) do not communicate with each other. 5. A control method based on the de-powering and independent operation of the composite heat pump air-conditioning system according to any one of claims 1-4, wherein the method comprises the following steps: A. Operation in winter: The photovoltaic heat exchanger (6) and the finned tube heat exchanger (4) are used in parallel, and the photovoltaic panels on the surface of the photovoltaic heat exchanger (6) absorb sunlight to generate electricity, and part of it is stored as electricity in the battery ( 8), part of the power supply to the system, the waste heat recovery system uses the waste heat as a high-temperature heat source to further heat the return water of the system, and the waste heat recovery system provides the system water supply temperature; B. Operation in summer: The photovoltaic heat exchanger (6) is only used for power generation and not for heat exchange, the finned tube heat exchanger (4) is used as a condenser, and the waste heat recovery system uses the waste heat as the driving heat source of the waste heat recovery system. It is converted into cold energy to supply cooling to the user side.

Images