Waste heat recovery and loop heat pipe two-stage coupling air source heat pump system

Abstract

The utility model discloses a waste heat recovery and loop heat pipe two-stage coupling air source heat pump system, and relates to the technical field of heat recovery equipment, in particular to the waste heat recovery and loop heat pipe two-stage coupling air source heat pump system which comprises an air source heat pump, and the air source heat pump comprises a compressor, a first condenser, an expansion valve and a first evaporator; a second evaporator and a second condenser in the loop heat pipe component are both used for heat exchange, a compressor in the air source heat pump generates heat in the operation process, the second evaporator conducts the heat on the compressor to a working medium located in the second evaporator, the working medium absorbs the heat and then evaporates to form steam, and the gaseous working medium flows to the second condenser through an eighth guide pipe and then flows to the second condenser through an eighth guide pipe. Due to the fact that the second condenser is coupled with the fins of the first evaporator of the air source heat pump, the temperature of the fins after frosting is low, heat of the gaseous working medium is conducted to the fins through the second condenser, the first evaporator is heated to defrost, and the purpose of efficient heating and defrosting is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat recovery equipment, in particular to a waste heat recovery and loop heat pipe two-stage coupled air source heat pump system. Background Art

[0002] Air-source heat pumps are widely used nationwide as energy-efficient, environmentally friendly, efficient, and safe heating and cooling systems. Using air as a heat source, they can transfer low-temperature heat to a higher-temperature heat source, making them easy to install and low-cost. However, due to high humidity in winter, the refrigerant in the air-source heat pump's evaporator absorbs heat from the air to raise the water temperature. When the evaporator surface temperature drops below zero degrees Celsius, frost forms. This frost reduces air flow and reduces the heat transfer coefficient of the fins, resulting in poor system heat transfer performance. Furthermore, as the frost layer thickens, the thermal resistance between the outdoor air and the refrigerant increases, lowering the evaporation temperature and the compressor's suction pressure. This increases compressor energy consumption and, in severe cases, causes unit shutdown, shortening the compressor's lifespan. Currently, the most commonly used defrost control methods include timed defrost, time-temperature methods, and fuzzy intelligent control defrost. These methods generally measure coil temperature using temperature sensors, which are cost-effective but prone to frost failure or false defrosting.

[0003] In the published Chinese patent application, publication number: CN117968288A, patent name: Air source heat pump defrost control method and air source heat pump defrost control system, this prior art obtains the fan vibration signal corresponding to the target heat pump, performs spectrum analysis on the fan vibration signal, extracts features after pre-processing, combines the analysis method of the artificial intelligence model, and uses a combined algorithm to accurately and quickly judge the frosting fault condition represented by the vibration state of the air source heat pump, diagnoses the frosting fault of the air source heat pump, and defrosts on demand in combination with the defrost control signal. This prior art uses sensors and other components to realize intelligent control to control the start and stop of the fan, and uses the fan to blow air for defrosting. Although this prior art can solve the above problems, when this prior art uses components such as fans to implement defrosting, it needs to use electricity to drive the fan, which consumes a lot of energy and has a high overall equipment cost.

[0004] In a published Chinese patent application, publication number CN216114827U, title: Air Source Heat Pump Defrost Device, this prior art utilizes a drive mechanism and a defrost mechanism. A servo motor controls the rotation of a first connecting rod, which in turn drives a protrusion to rotate. The protrusion slides within a slide groove, thereby driving the movement of a second connecting rod. The second connecting rod drives the movement of a first movable rod and a second movable rod. The first movable rod controls the first movable plate to slide up and down within a first slide rail, and the second movable rod controls the second movable plate to slide up and down within a second slide rail. The evaporator surface is defrosted by a scraper and a heating plate. Although this prior art can solve the aforementioned problems, it has a complex overall structure. The drive mechanism and defrost mechanism are prone to damage to the evaporator during operation. Furthermore, the servo motor and the like are electrically driven, resulting in high energy consumption and high equipment costs. Utility Model Content

[0005] (1) Technical problems solved

[0006] In view of the deficiencies of the prior art, the present invention provides a waste heat recovery and loop heat pipe two-stage coupled air source heat pump system, which solves the problems raised in the above background technology.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a waste heat recovery and loop heat pipe two-stage coupled air source heat pump system, including an air source heat pump, the air source heat pump including a compressor, a first condenser, an expansion valve, and a first evaporator; also including a loop heat pipe component, the loop heat pipe component is coupled and arranged on the air source heat pump; the loop heat pipe component includes a second evaporator and a second condenser, the pipeline of the second evaporator is coupled to the compressor of the air source heat pump, and the pipeline of the second condenser is coupled to the fins of the first evaporator in the air source heat pump; the medium outflow end of the second evaporator is connected to the medium inflow end of the second condenser, and the medium outflow end of the second condenser is connected to the medium inflow end of the second evaporator; a closed medium circulation flow channel is formed between the second evaporator and the second condenser, and a working medium is placed in the medium circulation flow channel.

[0009] Optionally, the loop heat pipe component further includes a seventh conduit and an eighth conduit, one end of the seventh conduit being fixedly mounted to the medium inlet end of the second evaporator and the two being in communication, and the other end of the seventh conduit being fixedly mounted to the medium outlet end of the second condenser and the two being in communication; one end of the eighth conduit being fixedly mounted to the medium outlet end of the second evaporator and the two being in communication, and the other end of the eighth conduit being fixedly mounted to the medium inlet end of the second condenser and the two being in communication.

[0010] Optionally, the second evaporator is located at a lower height than the second condenser.

[0011] Optionally, the exteriors of the seventh and eighth conduits are both wrapped with a heat-insulating layer, and a one-way valve is provided on the seventh conduit (14).

[0012] (3) Beneficial effects

[0013] The utility model provides a waste heat recovery and loop heat pipe two-stage coupled air source heat pump system, which has the following beneficial effects:

[0014] 1. This waste heat recovery and loop heat pipe two-stage coupled air source heat pump system, through the coordinated configuration of the loop heat pipe component and the air source heat pump, enables the system to efficiently defrost the air source heat pump. The second evaporator and second condenser in the loop heat pipe component are both used for heat exchange. The compressor in the air source heat pump generates heat during operation. The second evaporator transfers the heat from the compressor to the working fluid within it. The working fluid absorbs the heat and evaporates to form vapor. The gaseous working fluid flows to the second condenser through the eighth conduit. Because the second condenser is coupled to the fins of the first evaporator of the air source heat pump, the fins are at a lower temperature after frosting. The heat from the gaseous working fluid is transferred to the fins through the second condenser, thereby heating the first evaporator and defrosting it, achieving the purpose of efficient temperature increase and frost removal. The working fluid in the second condenser loses heat and condenses into a liquid state. The liquid working fluid flows back to the second evaporator through the seventh conduit. Compared with the existing technology, the overall structure is simple, no electricity supply is required, energy saving and environmental protection, and the equipment cost is low.

[0015] 2. This waste heat recovery and loop heat pipe two-stage coupled air source heat pump system effectively achieves waste heat recovery through the coordinated configuration of loop heat pipe components and air source heat pumps. The compressor body temperature rises during compression. The second evaporator absorbs heat from the compressor body, achieving compressor cooling. At the same time, the working fluid inside the second evaporator, after absorbing heat, flows to the second condenser. The heat from the working fluid is transferred to the fins of the first evaporator of the air source heat pump through the second condenser. The first evaporator of the air source heat pump absorbs heat, thus achieving heat recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0017] Figure 1This is a schematic diagram of the principle of the waste heat recovery and loop heat pipe two-stage coupled air source heat pump system of the utility model (the arrows in the figure indicate the flow direction of the medium in the conduit);

[0018] Figure 2 Schematic diagram of the principle of the air source heat pump in the waste heat recovery and loop heat pipe two-stage coupled air source heat pump system of the utility model (the black solid arrow in the figure indicates the flow direction of the medium in the conduit);

[0019] Figure 3 This is a schematic diagram of the principle of the loop heat pipe components in the waste heat recovery and loop heat pipe two-stage coupled air source heat pump system of the utility model (the black hollow arrows in the figure indicate the flow direction of the working medium in the conduit).

[0020] In the figure: 1, compressor; 2, first condenser; 3, expansion valve; 4, first evaporator; 5, four-way valve; 6, first conduit; 7, second conduit; 8, third conduit; 9, fourth conduit; 10, fifth conduit; 11, sixth conduit; 12, second evaporator; 13, second condenser; 14, seventh conduit; 15, eighth conduit. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indications or implications.

[0022] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances. Obviously, the embodiments described are only some of the embodiments of this utility model, and not all of them.

[0023] See also Figures 1 to 3The utility model provides a technical solution: a waste heat recovery and loop heat pipe two-stage coupled air source heat pump system, including an air source heat pump, the air source heat pump includes a compressor 1, a first condenser 2, an expansion valve 3, a first evaporator 4 and a four-way valve 5.

[0024] The air-source heat pump also includes multiple conduits, namely a first conduit 6, a second conduit 7, a third conduit 8, a fourth conduit 9, a fifth conduit 10, and a sixth conduit 11. The compressor 1 compresses low-temperature, low-pressure refrigerant vapor into high-temperature, high-pressure vapor, thereby increasing its temperature and pressure to provide power for heating or cooling. The first evaporator 4 is the component in the air-source heat pump that absorbs heat from the air. When outdoor air flows through the fins of the first evaporator 4, the fins absorb heat from the air, and the refrigerant inside the first evaporator 4 absorbs heat and evaporates. The first condenser 2 is one of the main heat exchange devices in the heat pump water heater. During normal system operation, the high-temperature, high-pressure refrigerant liquid in the first condenser 2 releases heat that is absorbed by the water, achieving heat exchange between the refrigerant and water. The water absorbs heat and its temperature rises. The expansion valve 3 controls the flow of refrigerant. By adjusting the refrigerant flow rate and pressure, the expansion valve 3 causes the refrigerant to evaporate and condense, thereby controlling the operating state and temperature fluctuations of the heat pump.

[0025] refer to Figure 2 The medium outflow end of the first condenser 2 is connected to one end of the expansion valve 3 through the third conduit 8, and the other end of the expansion valve 3 is connected to the medium inflow end of the first evaporator 4 through the fourth conduit 9. The medium outflow end of the first evaporator 4 is connected to the first port of the four-way valve 5 through the fifth conduit 10, and the second port of the four-way valve 5 is connected to the medium inflow end of the compressor 1 through the sixth conduit 11. The medium outflow end of the compressor 1 is connected to the third port of the four-way valve 5 through the first conduit 6, and the fourth port of the four-way valve 5 is connected to the medium inflow end of the first condenser 2 through the second conduit 7. Figure 2 In the figure, the black solid arrow indicates the flow direction of the working medium (such as refrigerant) in the air source heat pump.

[0026] The waste heat recovery and loop heat pipe two-stage coupled air source heat pump system also includes a loop heat pipe component, which is coupled to the air source heat pump.

[0027] The loop heat pipe assembly includes a second evaporator 12 and a second condenser 13. The piping of the second evaporator 12 is coupled to the compressor 1 of the air-source heat pump, while the piping of the second condenser 13 is coupled to the fins of the first evaporator 4 in the air-source heat pump. The medium outflow end of the second evaporator 12 is connected to the medium inflow end of the second condenser 13, and the medium outflow end of the second condenser 13 is connected to the medium inflow end of the second evaporator 12. A closed medium circulation channel is formed between the second evaporator 12 and the second condenser 13, and the working medium is placed in the medium circulation channel.

[0028] The second evaporator 12 is fixedly mounted on the compressor 1 of the air source heat pump, and the two are in close contact to enhance the thermal conductivity between the two. The piping of the second condenser 13 is fixedly mounted on the fins of the first evaporator 4 in the air source heat pump, and the piping of the second condenser 13 is in close contact with the fins of the first evaporator 4 to enhance the thermal conductivity between the two. The working medium refers to the working medium that circulates in the refrigeration system and transfers heat through state changes (such as expansion or compression). It is the medium that transfers thermal energy.

[0029] Defrosting process: The compressor 1 in the air source heat pump generates heat during operation (when the medium inside the compressor 1 is compressed, the distance between the molecules of the medium decreases, and the molecular movement speed increases, thereby increasing the temperature and pressure of the medium. This process releases heat, causing the temperature of the compressor 1 to rise). The second evaporator 12 transfers the heat from the compressor 1 to the working fluid located inside it. After absorbing the heat, the working fluid evaporates to form steam (gaseous working fluid). The gaseous working fluid flows to the second condenser 13 through the eighth conduit 15. Since the second condenser 13 is coupled with the fins of the first evaporator 4 of the air source heat pump, the temperature of the fins is lower after frosting. The heat of the gaseous working fluid is transferred to the fins through the second condenser 13, thereby heating up the first evaporator 4 and defrosting, achieving the purpose of efficient heating and frost removal. After the heat of the working fluid in the second condenser 13 is dissipated, it condenses into liquid, and the liquid working fluid flows back to the second evaporator 12 through the seventh conduit 14.

[0030] Waste heat recovery process: The compressor 1 will cause its body temperature to rise during the compression process. The second evaporator 12 is used to absorb the heat from the compressor 1 body, thereby cooling the compressor 1. At the same time, the working fluid inside the second evaporator 12 flows to the second condenser 13 after absorbing heat. The heat on the working fluid is transferred to the fins of the first evaporator 4 of the air source heat pump through the second condenser 13. The first evaporator 4 of the air source heat pump absorbs the heat, thereby realizing heat recovery and utilization.

[0031] Specifically, the loop heat pipe component further includes a seventh conduit 14 and an eighth conduit 15. One end of the seventh conduit 14 is fixedly mounted to and communicates with the medium inflow end of the second evaporator 12, and the other end of the seventh conduit 14 is fixedly mounted to and communicates with the medium outflow end of the second condenser 13. One end of the eighth conduit 15 is fixedly mounted to and communicates with the medium outflow end of the second evaporator 12, and the other end of the eighth conduit 15 is fixedly mounted to and communicates with the medium inflow end of the second condenser 13.

[0032] Among them, reference Figure 3(The black hollow arrows in the figure indicate the flow direction of the working medium), the eighth conduit 15 is used to guide the gaseous working medium in the second evaporator 12 to the second condenser 13; the seventh conduit 14 is used to guide the liquid working medium in the second condenser 13 to the second evaporator 12.

[0033] More specifically, the exteriors of the seventh conduit 14 and the eighth conduit 15 are both wrapped with a thermal insulation layer, and the seventh conduit 14 and the eighth conduit 15 are both provided with a one-way valve.

[0034] The insulation layer is made of heat-insulating material. A one-way valve is provided on the seventh conduit 14 to ensure that the liquid working medium flows from the second condenser 13 to the second evaporator 12, preventing backflow. At the same time, the one-way valve prevents the gaseous working medium from flowing through the seventh conduit 14.

[0035] Specifically, the second evaporator 12 is located at a lower height than the second condenser 13 .

[0036] There is a height difference between the second evaporator 12 and the second condenser 13 , so as to ensure that the liquid working medium in the second condenser 13 can flow toward the second evaporator 12 under the effect of the height difference.

[0037] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A waste heat recovery and loop heat pipe two-stage coupled air source heat pump system, comprising an air source heat pump, wherein the air source heat pump comprises a compressor (1), a first condenser (2), an expansion valve (3), and a first evaporator (4); characterized in that: It also includes a loop heat pipe component, which is coupled to the air source heat pump; The loop heat pipe component comprises a second evaporator (12) and a second condenser (13); the pipeline of the second evaporator (12) is coupled to the compressor (1) of the air source heat pump; and the pipeline of the second condenser (13) is coupled to the fins of the first evaporator (4) in the air source heat pump; The medium outflow end of the second evaporator (12) is connected to the medium inflow end of the second condenser (13), and the medium outflow end of the second condenser (13) is connected to the medium inflow end of the second evaporator (12); a closed medium circulation flow channel is formed between the second evaporator (12) and the second condenser (13), and a working medium is placed in the medium circulation flow channel.

2. The waste heat recovery and loop heat pipe two-stage coupled air source heat pump system according to claim 1 is characterized by: The loop heat pipe component further comprises a seventh conduit (14) and an eighth conduit (15); one end of the seventh conduit (14) is fixedly mounted on the medium inlet end of the second evaporator (12) and the two are in communication; the other end of the seventh conduit (14) is fixedly mounted on the medium outlet end of the second condenser (13) and the two are in communication; one end of the eighth conduit (15) is fixedly mounted on the medium outlet end of the second evaporator (12) and the two are in communication; the other end of the eighth conduit (15) is fixedly mounted on the medium inlet end of the second condenser (13) and the two are in communication.

3. The waste heat recovery and loop heat pipe two-stage coupled air source heat pump system according to claim 1 is characterized in that: The second evaporator (12) is located at a lower height than the second condenser (13).

4. The waste heat recovery and loop heat pipe two-stage coupled air source heat pump system according to claim 2 is characterized by: The exteriors of the seventh conduit (14) and the eighth conduit (15) are both wrapped with a heat-insulating layer, and a one-way valve is provided on the seventh conduit (14).

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