A super high temperature water source heat pump unit

Abstract

The utility model discloses a super high temperature water source heat pump unit, comprising a first heat exchanger, a circulating water pump, a second heat exchanger, a compressor, a third heat exchanger, a liquid storage device, a throttling element and a water tank, wherein the first heat exchanger is connected in series with the water tank, the circulating water pump and the second heat exchanger in sequence through a pipeline, and the compressor is connected in series with the second heat exchanger, the throttling element and the third heat exchanger in sequence through a pipeline. The low-grade heat energy from the outside is converted into high-grade heat energy to produce heat energy above 130°C, which is used for various heating methods, and solves the problem of low heating temperature of traditional heat pumps and heating transformation of using a super high temperature water source heat pump unit to replace a boiler and still use a steam type thermal cycle system.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to an ultra-high temperature water source heat pump unit. Background Art

[0002] Traditional heating methods are divided into the following categories:

[0003] 1. Stove heating: Use fuel such as wood or coal to burn in a stove to generate heat and directly heat the space.

[0004] 2. Boiler heating: By burning fuels such as coal, natural gas or electricity, water or steam is heated, and then transported through pipes to radiators in each room for heat dissipation.

[0005] 3. Solar heating: Use solar collectors to collect solar energy and convert it into heat energy for indoor heating.

[0006] 4. Traditional heat pump heating: Utilizing the constant temperature of the underground, heat energy is supplied through a heat pump system.

[0007] Disadvantages of the existing technology:

[0008] 1. Stove heating: Coal and wood stoves for heating not only have low energy utilization rates, but also cause serious air pollution. Therefore, coal-fired boilers are being gradually phased out in some cities.

[0009] 2. Boiler heating: The operation cost of oil and gas boilers is very high, and the use of electric heating consumes a lot of electricity, which is less efficient and more expensive;

[0010] 3. Solar heating: Solar heating is highly dependent on weather, has low energy density and installation environment restrictions, making it difficult to meet higher thermal energy demands, and the system stability is poor;

[0011] 4. Traditional heat pump heating: The use of traditional air source heat pump air conditioning units for heat pump heating will be affected by the low ambient temperature in winter. When the temperature is below -5℃, the unit will be unstable and the heating capacity will decrease, making it difficult to meet the user's requirements. Water source heat pump is an alternative solution to heating and air conditioning that has great advantages both technically and economically. The maximum outlet water temperature of traditional water source heat pump units is 55℃ (such as R22) or 65℃ (such as R134a). Under high temperature conditions, the working pressure is too high, the compression ratio is large, and the energy efficiency ratio is low. It is impossible to form a hot water temperature above 100℃. In addition, due to the operating limit of the compressor, the safety and reliability of the unit in long-term operation under high temperature conditions is low. For industrial heating above 100℃, it cannot provide a heat source with sufficient temperature, and boilers are still required as auxiliary heat sources.

[0012] To this end, we propose an ultra-high temperature water source heat pump unit. Utility Model Content

[0013] The purpose of the utility model is to provide an ultra-high temperature water source heat pump unit to solve the problems raised in the above background technology.

[0014] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an ultra-high temperature water source heat pump unit, comprising a first heat exchanger, a circulating water pump, a second heat exchanger, a compressor, a third heat exchanger, a liquid reservoir, a throttling element and a water tank, wherein the first heat exchanger is connected in series with the water tank, the circulating water pump and the second heat exchanger in sequence through a pipeline, and the compressor is connected in series with the second heat exchanger, the throttling element and the third heat exchanger in sequence through a pipeline.

[0015] Optionally, the first heat exchanger is provided with a water cooling channel including a cold water return pipe and a cold water outlet pipe.

[0016] Optionally, the second heat exchanger consists of two refrigerant channels and a hot water channel including a hot water return pipe and a hot water outlet pipe.

[0017] Optionally, a temperature sensor is provided at the hot water outlet of the hot water outlet pipe.

[0018] Optionally, the throttling element is any one of a thermal expansion valve, an electronic expansion valve or a capillary tube.

[0019] Optionally, the first heat exchanger exchanges heat with an external heat source to obtain low-temperature hot water which is stored in a water tank.

[0020] Optionally, the third heat exchanger is provided with a steam pipe connected to the equipment, and a temperature sensor is provided at the connection between the steam pipe and the third heat exchanger.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] The ultra-high temperature water source heat pump unit, by starting the circulating water pump, makes the first heat exchanger exchange heat with the external heat source to obtain low-temperature hot water stored in the water tank, and at the same time brings the hot water into the second heat exchanger for heat exchange and then returns to the first heat exchanger for heat exchange again, so as to obtain a continuous low-grade heat source in this way, the compressor is turned on to make the refrigerant form a high-temperature and high-pressure gaseous refrigerant, which flows into the third heat exchanger through the compressor exhaust port to condense and release heat to become a medium-temperature and high-pressure liquid refrigerant, the medium-temperature and high-pressure liquid refrigerant flows through the liquid storage tank, and then is throttled by the throttling element to become a low-temperature and low-pressure liquid refrigerant, the low-temperature and low-pressure liquid refrigerant absorbs heat and evaporates through the second heat exchange to become a low-temperature and low-pressure vapor refrigerant, which returns to the compressor from the return port of the compressor, so as to complete the cascade refrigeration compression cycle to produce high-temperature thermal energy, use the low-grade thermal energy of the outside world to convert into high-grade thermal energy, produce thermal energy above 130°C, which is used for various heating methods, and solves the low heating temperature of the traditional heat pump and the heating transformation problem of using the ultra-high temperature water source heat pump unit to replace the boiler and still use the steam type thermal cycle system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model is a structural schematic diagram of an ultra-high temperature water source heat pump unit.

[0024] In the figure: 1. first heat exchanger; 2. circulating water pump; 3. second heat exchanger; 4. compressor; 5. third heat exchanger; 6. liquid storage tank; 7. throttling element; 8. low-temperature hot water; 9. water tank; 10. steam pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1The utility model provides an ultra-high temperature water source heat pump unit, comprising a first heat exchanger 1, a circulating water pump 2, a second heat exchanger 3, a compressor 4, a third heat exchanger 5, a liquid storage tank 6, a throttling element 7 and a water tank 9. The first heat exchanger 1 is connected in series with the water tank 9, the circulating water pump 2 and the second heat exchanger 3 in sequence through a pipeline. The compressor 4 is connected in series with the second heat exchanger 3, the throttling element 7 and the third heat exchanger 5 in sequence through a pipeline. By turning on the circulating water pump 2, the first heat exchanger 1 exchanges heat with an external heat source to obtain low-temperature hot water 8 which is stored in the water tank 9. At the same time, the hot water is brought into the second heat exchanger 3 for heat exchange and then returns to the first heat exchanger 3. The heat exchanger 1 performs heat exchange again, and a continuous low-grade heat source is obtained in this reciprocating manner. The compressor 4 is turned on to form a high-temperature and high-pressure gaseous refrigerant, which flows into the third heat exchanger 5 through the exhaust port of the compressor 4 to condense and release heat to become a medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant flows through the liquid storage tank 6, and then is throttled by the throttling element 7 to become a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant absorbs heat and evaporates through the second heat exchanger 3 to become a low-temperature and low-pressure vapor refrigerant, which returns to the compressor 4 from the return air port of the compressor 4. This reciprocating cycle completes the cascade refrigeration compression cycle to produce high-temperature thermal energy, and uses the external low-grade thermal energy to convert into high-grade thermal energy.

[0027] The first heat exchanger 1 is provided with a water cooling channel including a cold water return pipe and a cold water outlet pipe.

[0028] The second heat exchanger 3 is composed of two refrigerant channels and a hot water channel including a hot water return pipe and a hot water outlet pipe.

[0029] The hot water outlet of the hot water outlet pipe is provided with a temperature sensor.

[0030] The throttling element 7 is any one of a thermal expansion valve, an electronic expansion valve or a capillary tube.

[0031] The first heat exchanger 1 exchanges heat with an external heat source to obtain low-temperature hot water 8 which is stored in a water tank 9 .

[0032] The third heat exchanger 5 is provided with a steam pipe 10 connected to the equipment, and a temperature sensor is provided at the connection between the steam pipe 10 and the third heat exchanger 5 .

[0033] Working principle:

[0034] By turning on the circulating water pump 2, the first heat exchanger 1 exchanges heat with the external heat source to obtain low-temperature hot water 8 which is stored in the water tank 9. At the same time, the hot water is brought into the second heat exchanger 3 for heat exchange and then returns to the first heat exchanger 1 for heat exchange again. In this way, a continuous low-grade heat source is obtained. The compressor 4 is turned on to form a high-temperature and high-pressure gaseous refrigerant which flows through the exhaust port of the compressor 4 into the third heat exchanger 5 to condense and release heat to become a medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant flows through the liquid storage tank 6 and then passes through the throttling element 7. The throttling becomes a low-temperature and low-pressure liquid refrigerant, which absorbs heat and evaporates through the second heat exchanger 3 to become a low-temperature and low-pressure vapor refrigerant, which returns to the compressor 4 from the return air port of the compressor 4. This reciprocating cascade refrigeration compression cycle is completed to produce high-temperature thermal energy, and the low-grade thermal energy from the outside is converted into high-grade thermal energy to produce thermal energy above 130°C for various heating methods, solving the problem of low heating temperature of traditional heat pumps and the heating transformation problem of using ultra-high temperature water source heat pump units to replace boilers while still using steam-type thermal cycle systems.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-high temperature water source heat pump unit, comprising a first heat exchanger (1), a circulating water pump (2), a second heat exchanger (3), a compressor (4), a third heat exchanger (5), a liquid storage tank (6), a throttling element (7) and a water tank (9), characterized in that: The first heat exchanger (1) is connected in series with a water tank (9), a circulating water pump (2), and a second heat exchanger (3) in sequence through a pipeline, and the compressor (4) is connected in series with the second heat exchanger (3), a throttling element (7), and a third heat exchanger (5) in sequence through a pipeline.

2. The ultra-high temperature water source heat pump unit according to claim 1, characterized in that: The first heat exchanger (1) is provided with a water cooling channel comprising a cold water return pipe and a cold water outlet pipe.

3. The ultra-high temperature water source heat pump unit according to claim 1, characterized in that: The second heat exchanger (3) is composed of two refrigerant channels and a hot water channel including a hot water return pipe and a hot water outlet pipe.

4. The ultra-high temperature water source heat pump unit according to claim 3, characterized in that: The hot water outlet of the hot water outlet pipe is provided with a temperature sensor.

5. The ultra-high temperature water source heat pump unit according to claim 1, characterized in that: The throttling element (7) is any one of a thermal expansion valve, an electronic expansion valve or a capillary tube.

6. The ultra-high temperature water source heat pump unit according to claim 1, characterized in that: The first heat exchanger (1) exchanges heat with an external heat source to obtain low-temperature hot water (8) which is stored in a water tank (9).

7. The ultra-high temperature water source heat pump unit according to claim 1, characterized in that: The third heat exchanger (5) is provided with a steam pipe (10) connected to the equipment, and a temperature sensor is provided at the connection between the steam pipe (10) and the third heat exchanger (5).

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