Capillary net cage heat exchanger with phase change energy storage function, heat pump unit system and method

Abstract

The invention discloses a capillary tube net cage heat exchanger with phase change energy storage, a heat pump unit system and a method, solves the problem of limited heat exchange capacity of a heat pump unit in the prior art, and has the beneficial effect of effectively enhancing the heat exchange capacity of the heat pump unit. The capillary tube net cage heat exchanger body is supported by the frame body, the upper side and / or the lower side of the frame body are / is provided with the cover bodies, the cover bodies are internally provided with the cavities, the multiple bag bodies are arranged in the cavities, the core materials are arranged in the bag bodies, and the core materials are made of phase-change materials. And the phase-change material absorbs latent heat to generate state transformation so as to absorb heat energy accumulated at the front end, and / or under the heating working condition, when the temperature of a heat source at the front end of the heat pump unit is reduced to the set temperature, the phase-change material generates state transformation and releases heat, and thermal compensation is carried out on the front end.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump units, in particular to a capillary network box heat exchanger with phase change energy storage, a heat pump unit system and a method. Background Technique

[0002] The statements in this part only provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] A heat pump unit is a circulating system composed of a compressor, a heat exchanger, a throttler, etc. In the prior art, the front-end heat exchanger of a capillary tube is connected to the heat pump unit. When the front-end heat exchanger of the capillary tube is buried in sandy soil, due to the continuous operation of the heat pump unit, the temperature of the front-end cold source will gradually increase in summer (and the temperature of the heat source will decrease in winter). Because of the environment where the front-end heat exchanger of the capillary tube is located, the sandy soil cannot quickly conduct the energy of the front-end heat exchanger of the capillary tube, resulting in a decrease in the heat exchange temperature difference between the front-end heat exchanger of the capillary tube and the surrounding sandy soil and a decline in the heat transfer driving force, thereby causing a decline in the heat exchange capacity and energy efficiency of the heat pump unit. There is no good solution to this problem in the prior art. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a capillary network box heat exchanger with phase change energy storage, which effectively enhances the heat exchange capacity of the capillary network box heat exchanger in summer and winter.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] In a first aspect, the present invention provides a capillary network box heat exchanger with phase change energy storage. The capillary network box heat exchanger is the front-end heat exchanger of a heat pump unit. The capillary network box heat exchanger includes a frame body that supports the capillary network box heat exchanger body. Covers are respectively arranged on the upper side and / or the lower side of the frame body. A cavity is arranged in the cover, and a plurality of capsules are arranged in the cavity. A core material is arranged in the capsule, and the material of the core material is a phase change material. In the refrigeration working condition, when the temperature of the front-end cold source of the heat pump unit rises to a set temperature, the phase change material absorbs latent heat and undergoes a phase change to consume the heat energy accumulated at the front end, and / or, in the heating working condition, when the temperature of the front-end heat source of the heat pump unit drops to a set temperature, the phase change material undergoes a phase change and releases heat to perform heat compensation on the front end.

[0007] For a capillary network box heat exchanger with phase change energy storage as described above, the phase change material is the first phase change material or the second phase change material. The phase change temperature of the first phase change material is 40°C - 60°C, and the phase change temperature of the second phase change material is -25°C - 0°C. The phase change temperature of the first phase change material is high and usually plays a role in summer. The phase change temperature of the second phase change material is low and usually plays a role in winter.

[0008] A capillary network box heat exchanger with phase change energy storage as described above. When the cover bodies are arranged on both the upper side and the lower side of the frame body, the phase change materials in the two cover bodies are different. The phase change materials on both sides of the frame body are the first phase change material and the second phase change material respectively.

[0009] A capillary network box heat exchanger with phase change energy storage as described above. A plurality of partition plates are arranged in the cover body, and the phase change materials in adjacent two partition plates are different. The phase change material on one side of the partition plate is the first phase change material, and the phase change material on the other side of the partition plate is the second phase change material. Thus, even if there is one cover body arranged at the frame body, because the cover body contains the first phase change material and the second phase change material, the capillary network box heat exchanger can play corresponding roles in both summer and winter.

[0010] A capillary network box heat exchanger with phase change energy storage as described above. Along the length direction of the frame body, a retaining wall is arranged on the side surface of the frame body. The length of the retaining wall is less than the length of the frame body or the retaining wall is arranged in a hollowed-out manner. A cavity is also arranged in the retaining wall, and the capsule body is arranged in the cavity. The phase change material is arranged in the capsule body as the core material. The phase change material in the retaining wall is different from the phase change material in the cover body. Thus, except for the upper side and the lower side of the frame body, the other two sides of the frame body can also be provided with phase change materials. However, considering the flow of seawater, the length of the retaining wall is less than the length of the frame body or is arranged in a hollowed-out manner to ensure the smooth flow of seawater, but the heat exchange capacity of the capillary network box heat exchanger can be enhanced.

[0011] A capillary network box heat exchanger with phase change energy storage as described above. The phase change material adopts a composite phase change material, and the composite phase change material is an organic-inorganic composite phase change material, or a polymer-based composite phase change material, or a heat conduction enhanced composite phase change material.

[0012] A capillary network box heat exchanger with phase change energy storage as described above. The frame body includes a transverse frame and a vertical frame. The transverse frame has two layers. One layer of the transverse frame supports the cover body, and the side part of the other layer of the transverse frame is connected to the capillary network box heat exchanger body;

[0013] A bayonet is arranged at the side part of the transverse frame. The capillary network box heat exchanger body includes a plurality of layers of brackets. The brackets support the capillary network. A convex part is arranged at the side of the bracket, and the convex part is clamped into the bayonet. Further, the bracket and the transverse frame are connected by welding to ensure the stable connection between the bracket and the transverse frame.

[0014] A capillary network box heat exchanger with phase change energy storage as described above. The fluid in the capillary network box heat exchanger body is nanofluid. Grooves with a set depth are engraved on the inner wall of the capillary network, and a graphene coating is coated on the inner wall of the capillary network.

[0015] In a second aspect, the present invention further provides a heat pump unit system, which includes a cooling tower and the capillary network box heat exchanger with phase change energy storage. The cooling tower and the capillary network box heat exchanger with phase change energy storage are respectively connected to the heat pump unit. The cooling tower and the capillary network box heat exchanger with phase change energy storage are arranged in parallel. The capillary network box heat exchanger is buried in the seaside sandy soil. A temperature sensor is arranged at the cover body, and the temperature sensor is connected to the controller of the heat pump unit. The controller is connected to an alarm;

[0016] When the temperature sensor obtains the temperature at the cover body and sends it to the controller, when the controller obtains that the temperature at the cover body is greater than or equal to 45 °C, it controls the alarm to give an alarm, cuts off the connection between the heat pump unit and the capillary network box heat exchanger with phase change energy storage, and connects the connection between the cooling tower and the heat pump unit.

[0017] In a third aspect, the present invention also discloses a working method of a heat pump unit system, including the following content:

[0018] Covers are respectively arranged on the upper side and / or the lower side of the frame body. Multiple capsules are arranged in the cover body, and a core material is arranged in the capsule. The material of the core material is a phase change material;

[0019] The capillary network box heat exchanger body is supported by the frame body;

[0020] In the refrigeration condition, the heat pump unit extracts heat through the indoor circulation system and releases thermal energy to the environmental medium via the capillary network box heat exchanger. As the system continues to operate, the temperature of the front-end cold source gradually rises, resulting in the attenuation of the heat transfer temperature difference. When the temperature of the front-end cold source of the heat pump unit rises to the set temperature, the phase change material changes from a solid state to a liquid state, absorbs latent heat and generates a phase change to consume the thermal energy accumulated at the front end;

[0021] And / or, in the heating condition, the capillary network box heat exchanger works reversely, extracts heat from the external heat source and conveys it to the user end after being upgraded by the heat pump unit. Continuous operation will cause the temperature of the front-end heat source to gradually decrease. When the temperature of the front-end heat source of the heat pump unit drops to the set temperature, the phase change material changes from a liquid state to a fixed state, undergoes a phase change and releases heat to perform thermal compensation on the front end.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1) In the present invention, the capillary network heat exchanger not only has a capillary network heat exchanger body, but also has covers arranged on the upper side and / or the lower side of the capillary network heat exchanger body. Capsules are arranged in the covers, and core materials made of phase change materials are arranged in the capsules. The phase change material can absorb heat to consume the thermal energy accumulated at the front end in the refrigeration condition, or undergo a phase change to release heat in the heating condition. In this way, when the temperature difference between the front-end heat exchanger of the capillary and the sandy soil is gradually decreasing, the temperature of the front-end cold source is reduced, or the temperature of the front-end heat source is increased, thereby further improving the heat transfer capacity of the capillary network heat exchanger.

[0024] 2) When the upper side and the lower side of the frame body in the present invention are both provided with cover bodies, the phase change materials in the two side cover bodies are different. The phase change materials on both sides of the frame body are the first phase change material and the second phase change material respectively. In this way, it can play a role both in refrigeration and in heating, improving the heat exchange capacity of the capillary network box heat exchanger.

[0025] 3) A partition can be provided in the cover body in the present invention. In this way, even if there is one cover body provided at the frame body, since the cover body contains the first phase change material and the second phase change material, it is ensured that the capillary network box heat exchanger can play corresponding roles in both summer and winter.

[0026] 4) In the present invention, to further enhance the heat exchange capacity, a retaining wall can be provided on the side of the frame body. The length of the retaining wall is less than the length of the frame body or it is provided with a hollow, ensuring the smooth flow of seawater, but also enhancing the heat exchange capacity of the capillary network box heat exchanger. Description of the Drawings

[0027] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0028] Figure 1 is a schematic diagram of a capillary network box heat exchanger with phase change energy storage according to one or more embodiments of the present invention;

[0029] Figure 2 is a schematic diagram of the setting of the capsule body in a capillary network box heat exchanger with phase change energy storage according to one or more embodiments of the present invention;

[0030] Figure 3 is a schematic diagram of the setting of a partition at the cover body in a capillary network box heat exchanger with phase change energy storage according to one or more embodiments of the present invention;

[0031] Figure 4 is a schematic diagram of the setting of a retaining wall at the frame body in a capillary network box heat exchanger with phase change energy storage according to one or more embodiments of the present invention;

[0032] Figure 5 is a schematic diagram of the setting of a bayonet at the transverse frame in a capillary network box heat exchanger with phase change energy storage according to one or more embodiments of the present invention;

[0033] Figure 6 is a side view of a capillary network box heat exchanger with phase change energy storage according to one or more embodiments of the present invention;

[0034] Figure 7Schematic diagram of a capillary network box heat exchanger with phase change energy storage according to one or more embodiments of the present invention, disposed in sandy soil;

[0035] Figure 8 Schematic diagram of the capillary network in a capillary network box heat exchanger with phase change energy storage according to one or more embodiments of the present invention;

[0036] Figure 9 Schematic of the working principle of a capillary network box heat exchanger with phase change energy storage according to one or more embodiments of the present invention Figure 1 ;

[0037] Figure 10 Schematic of the working principle of a capillary network box heat exchanger with phase change energy storage according to one or more embodiments of the present invention Figure 2 。

[0038] In the figure: The distances or sizes between each part are exaggerated for showing the positions of each part, and the schematic diagram is only for illustration.

[0039] Among them: 1. Capillary network heat exchanger, 2. Cover body, 3. Capsule body, 4. Core material, 5. Partition board, 6. Retaining wall, 7. Bayonet, 8. Sandy soil, 9. Seawater, 10. Capillary network, 11. Capillary network body, 12. Frame body, 13. Transverse frame. Detailed implementation mode

[0040] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanations of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0041] It should be noted that the terms used herein are only for describing specific implementation modes and are not intended to limit the exemplary implementation modes according to the present invention. As used herein, unless the present invention clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof;

[0042] As introduced in the background art, there is a problem that the heat exchange capacity of the heat exchanger at the front end of the heat pump unit in the prior art is limited. To solve the above technical problems, the present invention proposes a capillary network box heat exchanger with phase change energy storage.

[0043] Embodiment 1

[0044] In a typical embodiment of the present invention, referring to Figure 1 、 Figure 2 and Figure 6As shown in the figure, a capillary network box heat exchanger with phase change energy storage includes a capillary network box heat exchanger 1 as the front-end heat exchanger of a heat pump unit. The capillary network box heat exchanger includes a frame 12, and the frame 12 supports the capillary network box heat exchanger body 11. Covers 2 are respectively arranged on the upper side and / or the lower side of the frame 12. A cavity is arranged in the cover 2, and a plurality of capsules 3 are arranged in the cavity. A core material 4 is arranged in the capsule 3, and the material of the core material 4 is a phase change material. Under the refrigeration condition, when the temperature of the cold source at the front end of the heat pump unit rises to the set temperature, the phase change material absorbs latent heat and undergoes a phase change to consume the heat energy accumulated at the front end, and / or, under the heating condition, when the temperature of the heat source at the front end of the heat pump unit drops to the set temperature, the phase change material undergoes a phase change and releases heat to perform heat compensation on the front end.

[0045] It should be noted that the phase change material is the first phase change material or the second phase change material. The phase change temperature of the first phase change material is 40°C - 60°C, and the phase change temperature of the second phase change material is -25°C - 0°C. The phase change temperature of the first phase change material is high and usually functions in summer, while the phase change temperature of the second phase change material is low and usually functions in winter.

[0046] It is easy to understand that when covers 2 are arranged on both the upper side and the lower side of the frame 12, the phase change materials in the two side covers 2 are different, and the phase change materials on both sides of the frame 12 are the first phase change material and the second phase change material respectively.

[0047] In some examples, refer to Figure 3 As shown in the figure, multiple partition plates 5 are arranged in the cover 2, and the phase change materials in adjacent two partition plates 5 are different. The phase change material on one side of the partition plate 5 is the first phase change material, and the phase change material on the other side of the partition plate is the second phase change material. In this way, even if there is one cover 2 at the frame 12, since the cover 2 contains the first phase change material and the second phase change material, it is ensured that the capillary network box heat exchanger can play corresponding roles in both summer and winter.

[0048] In other examples, refer to Figure 4 As shown in the figure, along the length direction of the frame 12, a retaining wall 6 is arranged on the side surface of the frame 12. The height of the retaining wall 6 is the same as the height of the frame, and the length of the retaining wall 6 is less than the length of the frame 12 or the retaining wall is hollowed out. A cavity is also arranged in the retaining wall 12, and a capsule 4 is arranged in the cavity. The phase change material in the capsule 4 is used as the core material 4. The phase change material in the retaining wall 6 is different from the phase change material in the cover. In this way, except for the upper side and the lower side of the frame 12, phase change materials can also be arranged on the other two sides of the frame. However, considering the flow of seawater, the length of the retaining wall 6 is less than the length of the frame or it is hollowed out to ensure the smooth flow of seawater, but it can also enhance the heat exchange capacity of the capillary network box heat exchanger.

[0049] Among them, the capsule body 4 is a capsule, and the material can be selected as a silica / polymer shell with a wall thickness of 50-200 nm. It can physically isolate the first phase change material and the second phase change material inside, avoiding chemical corrosion with the cover material (the interfacial reaction is reduced by 90%), and effectively buffering the thermal cycling stress through elastic design (the deformation rate <5%), enabling the material cycle life to exceed 10,000 times (the performance attenuation rate <3%), which is more than 10 times higher than that of traditional materials.

[0050] In this embodiment, the first phase change material is paraffin. The phase change temperature of paraffin is relatively high, usually between 40 and 60 °C. Therefore, it is only suitable for summer cooling. In summer, the heat pump unit extracts heat from the indoor area and releases the heat to the surrounding cold source through the capillary network heat exchanger at the front end. As the heat pump unit operates, the temperature of the cold source at the front end will increase, resulting in a decrease in the heat transfer temperature difference and affecting heat transfer. At this time, through the setting of the first phase change material in this embodiment, when the temperature rises to a certain extent, the heat at the front end can be absorbed through the phase change of the first phase change material (solid - liquid), thereby alleviating the temperature rise of the cold source, increasing the heat transfer temperature difference, being beneficial to heat transfer at the front end, and thus achieving an energy-saving effect.

[0051] The second phase change material can be water / salt solution, water / glycerol, etc. The phase change temperature is approximately between (-20 and 0 °C), such as sodium chloride hydrate (phase change temperature is approximately 0 °C), calcium chloride hydrate (phase change temperature is approximately -20 °C), and it can be applied to winter heating. In winter, the capillary network heat exchanger extracts heat from the front-end heat source and releases the heat to the end-users through the heat pump unit. As the heat pump unit operates, the temperature of the front-end heat source will decrease, resulting in a decrease in the heat transfer temperature difference and affecting heat transfer. By using the second phase change material, when the temperature drops to a certain extent, heat can be released to the front-end heat source through the phase change (liquid - solid), increasing the temperature of the heat source and the heat transfer temperature difference to promote heat exchange, and thus achieving an energy-saving effect.

[0052] In other examples, the phase change material adopts a composite phase change material, and the composite phase change material is an organic-inorganic composite phase change material, or a polymer-based composite phase change material, or a thermal conductivity-enhanced composite phase change material;

[0053] The organic-inorganic composite phase change material can be prepared by compounding organic wax (such as paraffin) with inorganic materials such as bentonite and metal powder, giving full play to the high thermal conductivity characteristics of inorganic materials (the thermal conductivity is increased by 40-60%), and effectively overcoming the defect of low thermal conduction efficiency of traditional organic materials;

[0054] The polymer-based composite phase change material can use polymer materials such as polyurethane and polypropylene as the matrix, enhancing the mechanical strength of the material through intermolecular forces (the compressive strength is increased by 2-3 times), and at the same time constructing a three-dimensional network structure to inhibit the flow of the phase change material, completely solving the leakage problem.

[0055] The thermally enhanced composite phase change material can adopt gradient-doped carbon nanotubes, graphene sheets (specific surface area > 500 m 2 / g), etc. as nano-thermal conductive fillers to construct an efficient heat conduction path, increasing the heat transfer rate of the composite material by 80 - 120%, and achieving rapid thermal response.

[0056] Regarding the cover 2, the material of the cover 2 is selected as high-density polyethylene (HDPE) or polypropylene (PP) plastic. These two materials have a relatively light structural weight, significantly reducing transportation and installation costs; HDPE / PP has excellent tolerance to seawater salt spray, microorganisms, and the chemical components of the phase change material, avoiding the oxidation and corrosion problems that are prone to occur in metal materials; the thermal conductivity of the plastic (0.2 - 0.5 W / m·K) is between that of concrete (1.5 W / m·K) and metal, which can not only avoid the inefficient heat conduction of concrete but also inhibit the excessive heat diffusion of metal, adapting to the heat buffering requirements of the capillary network heat exchanger; high-precision complex structure processing is achieved through the injection molding process, and the one-piece design reduces the risk of joint leakage;

[0057] In addition, the elastic modulus and thermal expansion coefficient of the material used for the cover 2 are relatively reasonable, enabling the cover to form a flexible interface layer, which can absorb the expansion / contraction deformation of the net cage caused by the seawater temperature fluctuation (-5 - 35°C), reducing the amplitude of the alternating stress by 40% - 70%; through the coordinated deformation of the cover plate and the frame body, the local concentrated stress is dispersed to the overall structure, inhibiting the initiation and propagation of microcracks.

[0058] It should be noted that the material of the frame 12 can be a rigid material, which can evenly transfer the external water flow impact load to the net cage support structure, increasing the anti-dynamic load capacity by more than 50%. The frame 12 is welded by ultrasonic means, effectively blocking the leakage of the phase change material and the seawater penetration corrosion. The frame 12 includes a horizontal frame 13 and a vertical frame. The vertical frame connects the lower horizontal frame and the upper horizontal frame. Refer to Figure 5 As shown, there are two layers of the upper or lower horizontal frames respectively. One layer of the horizontal frame 13 supports the cover 2, and the side of the other layer of the horizontal frame is connected to the capillary network heat exchanger body 11. The longitudinal section of the horizontal frame 13 is U-shaped, and the opening direction of the horizontal frame 13 faces the center of the horizontal frame. In this way, the horizontal frame can support the cover, and the horizontal frame 13 can be welded. A sealant can be set between the horizontal frame 13 and the cover 2 to ensure the stable support of the horizontal frame for the cover;

[0059] In addition, a bayonet 7 is provided on the side of the horizontal frame 13. The capillary network heat exchanger body includes multiple layers of brackets. Refer to Figure 8 As shown, each bracket supports the capillary network 10 respectively, and convex parts are provided on the four peripheral sides of the bracket. The convex parts are inserted into the bayonet 7, and the bracket and the horizontal frame are further welded together to ensure the stable connection between the bracket and the horizontal frame.

[0060] In addition, the fluid in the capillary network box heat exchanger body is nanofluid. By using nanofluid to replace traditional working fluids and dispersing highly thermally conductive nanoparticles (such as alumina Al2O3, copper oxide CuO), the thermal boundary layer is disrupted. Its huge specific surface area increases the contact efficiency between the fluid and the pipe wall by 30%-50%. At the same time, the Brownian motion of nanoparticles is utilized to enhance the micro-convection effect. Grooves with a set depth are engraved on the inner wall of the capillary network, and periodic grooves (depth 50-200 μm) are formed by laser etching to increase the turbulence intensity, and a graphene coating (thermal conductivity > 1500 W / m·K) is coated to establish a rapid heat conduction channel.

[0061] The capillary network box heat exchanger provided in this embodiment realizes dynamic thermal buffering through the heat storage characteristics of the phase change material. When the unit operates in summer, the phase change material absorbs the surplus heat of the front-end cold source and then delays the temperature rise; in winter, it releases the stored heat to compensate for the temperature drop of the heat source, thereby reducing the fluctuation range of the annual heat exchange temperature difference by 40%-60%. Numerical simulation shows that the introduction of the cover 2 reduces the heat transfer attenuation rate of the whole under extreme conditions from 22.3% to 7.8%. Combined with nanofluid and surface strengthening technology, the overall heat transfer coefficient is increased by 65%, and the annual stability of the COP (coefficient of performance) of the heat pump unit is increased by 28%.

[0062] Embodiment 2

[0063] This embodiment provides a heat pump unit system, including a cooling tower and a capillary network box heat exchanger with phase change energy storage described in Embodiment 1. The cooling tower and the capillary network box heat exchanger with phase change energy storage are respectively connected to the heat pump unit, and the cooling tower and the capillary network box heat exchanger with phase change energy storage are arranged in parallel. Refer to Figure 7 As shown, the capillary network box heat exchanger 1 is buried in the seaside sandy soil 8 (backfilled sandy soil), there is seawater 9 on the periphery of the sandy soil 8, a temperature sensor is set at the cover 2, the temperature sensor is connected to the controller of the heat pump unit, and the controller is connected to the alarm. The alarm can be an alarm light. When the temperature sensor obtains the temperature at the cover and sends it to the controller, and the controller obtains that the temperature at the cover 2 is greater than or equal to 45°C, the controller controls the alarm to give an alarm. The controller is the control center of the heat pump unit;

[0064] When the temperature sensor obtains the temperature at the cover and sends it to the controller, and the controller obtains that the temperature at the cover is greater than or equal to 45°C, the controller controls the alarm to give an alarm and cuts off the connection between the heat pump unit and the capillary network box heat exchanger with phase change energy storage, and connects the cooling tower and the heat pump unit.

[0065] Embodiment 3

[0066] This embodiment discloses a working method of a heat pump unit system. Refer to Figure 9 and Figure 10 As shown, it includes the following contents:

[0067] A cover body is respectively arranged on the upper side and / or the lower side of the frame body. A plurality of capsules are arranged in the cover body, and a core material is arranged in the capsules. The material of the core material is a phase change material;

[0068] Support the capillary network box heat exchanger body through the frame body 12;

[0069] Under the refrigeration condition, the heat pump unit extracts heat through the indoor circulation system and releases the heat energy to the environmental medium via the capillary network box heat exchanger. As the system continues to operate, the temperature of the front-end cold source gradually rises, resulting in the attenuation of the heat transfer temperature difference. When the temperature of the front-end cold source of the heat pump unit rises to the set temperature, the phase change material changes from a solid state to a liquid state, absorbs latent heat and undergoes a phase change to consume the heat energy accumulated at the front end;

[0070] And / or, under the heating condition, the capillary network box heat exchanger 1 operates reversely, extracts heat from the external heat source and conveys it to the user end after being upgraded by the heat pump unit. Continuous operation will cause the temperature of the front-end heat source to gradually decrease. When the temperature of the front-end heat source of the heat pump unit drops to the set temperature, the phase change material changes from a liquid state to a solid state, undergoes a phase change and releases heat to compensate the front end thermally.

[0071] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A capillary tube network box heat exchanger with phase change energy storage, the capillary tube network box heat exchanger being the front-end heat exchanger of a heat pump unit, characterized in that, The capillary network box heat exchanger includes a frame body that supports the capillary network box heat exchanger body. Covers are respectively arranged on the upper side and / or the lower side of the frame body. A cavity is arranged in the cover, and a plurality of capsules are arranged in the cavity. A core material is arranged in the capsule, and the material of the core material is a phase change material. Under the refrigeration condition, when the temperature of the cold source at the front end of the heat pump unit rises to the set temperature, the phase change material absorbs latent heat and undergoes a phase change to consume the heat energy accumulated at the front end, and / or, under the heating condition, when the temperature of the heat source at the front end of the heat pump unit drops to the set temperature, the phase change material undergoes a phase change and releases heat to perform heat compensation on the front end.

2. The capillary network box heat exchanger with phase change energy storage according to claim 1, characterized in that, The phase change material is the first phase change material or the second phase change material. The phase change temperature of the first phase change material is 40°C - 60°C, and the phase change temperature of the second phase change material is -25°C - 0°C.

3. The capillary network box heat exchanger with phase change energy storage according to claim 2, characterized in that, When the covers are arranged on both the upper side and the lower side of the frame body, the phase change materials in the covers on both sides are different. The phase change materials on both sides of the frame body are the first phase change material and the second phase change material respectively.

4. The capillary tube network box heat exchanger with phase change energy storage according to claim 2, characterized in that, A plurality of partition plates are arranged in the cover, and the phase change materials in adjacent two partition plates are different. The phase change material on one side of the partition plate is the first phase change material, and the phase change material on the other side of the partition plate is the second phase change material.

5. The capillary network box heat exchanger with phase change energy storage according to claim 1, characterized in that, Along the length direction of the frame body, a retaining wall is arranged on the side surface of the frame body. The length of the retaining wall is less than the length of the frame body or the retaining wall is arranged in a hollowed-out manner. A cavity is also arranged in the retaining wall, and the capsules are arranged in the cavity. The phase change material is arranged in the capsule as the core material, and the phase change material in the retaining wall is different from the phase change material in the cover.

6. A capillary tube network box heat exchanger with phase change energy storage according to claim 1, characterized in that The phase change material adopts a composite phase change material, and the composite phase change material is an organic-inorganic composite phase change material, or a polymer-based composite phase change material, or a heat conduction enhanced composite phase change material.

7. A capillary tube network box heat exchanger with phase change energy storage according to claim 1, characterized in that, The frame body includes a transverse frame and a vertical frame. The transverse frame has two layers. One layer of the transverse frame supports the cover, and the side part of the other layer of the transverse frame is connected to the capillary network box heat exchanger body. A bayonet is arranged on the side part of the transverse frame. The capillary network box heat exchanger body includes multiple layers of brackets that support the capillary network. A convex part is arranged on the side of the bracket, and the convex part is snapped into the bayonet, and further the bracket and the transverse frame are connected by welding.

8. The capillary network box heat exchanger with phase change energy storage according to claim 7, characterized in that The fluid in the capillary network box heat exchanger body is a nanofluid. Grooves with a set depth are engraved on the inner wall of the capillary network, and a graphene coating is coated on the inner wall of the capillary network.

9. A heat pump unit system, characterized in that, It includes a cooling tower and a capillary network box heat exchanger with phase change energy storage according to any one of claims 1 - 8. The cooling tower and the capillary network box heat exchanger with phase change energy storage are respectively connected to the heat pump unit. The cooling tower and the capillary network box heat exchanger with phase change energy storage are arranged in parallel. The capillary network box heat exchanger is buried in the sandy soil by the sea. A temperature sensor is arranged at the cover, and the temperature sensor is connected to the controller of the heat pump unit. The controller is connected to an alarm. When the temperature sensor acquires the temperature at the cover and sends it to the controller, when the controller acquires that the temperature at the cover is greater than or equal to 45°C, it controls the alarm to give an alarm, cuts off the connection between the heat pump unit and the capillary network box heat exchanger with phase change energy storage, and connects the cooling tower and the heat pump unit.

10. The working method of a heat pump unit system according to claim 9, characterized in that, It includes the following content: A cover body is respectively arranged on the upper side and / or the lower side of the frame body. A plurality of capsules are arranged in the cover body, and a core material is arranged in the capsules. The material of the core material is a phase change material; The capillary network box heat exchanger body is supported by the frame body; Under the refrigeration condition, the heat pump unit extracts heat through the indoor circulation system and releases the heat energy to the environmental medium through the capillary network box heat exchanger. As the system continuously operates, the temperature of the front-end cold source gradually rises, resulting in the attenuation of the heat exchange temperature difference. When the temperature of the front-end cold source of the heat pump unit rises to the set temperature, the phase change material changes from a solid state to a liquid state, absorbs latent heat and generates a phase change to consume the heat energy accumulated at the front end; And / or, under the heating condition, the capillary network box heat exchanger works reversely, extracts heat from the external heat source, improves the quality through the heat pump unit and then transports it to the user end. Continuous operation will cause the temperature of the front-end heat source to gradually decrease. When the temperature of the front-end heat source of the heat pump unit drops to the set temperature, the phase change material changes from a liquid state to a fixed state, undergoes a phase change and releases heat to compensate the heat at the front end.

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