An indoor natural convection heat exchanger
By designing an indoor natural convection heat exchanger with a parallel pipeline structure of microchannel flat tubes, the problems of hot air aggregation, uneven temperature and wind noise in the existing heating methods are solved, and the indoor heating effect is achieved with an efficient, wind-free and compact appearance.
Patent Information
- Application Number
- CN202421259390.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-06-04
AI Technical Summary
The existing indoor heating methods have problems such as hot air gathering in the ceiling and low temperature near the floor slab, wind noise impact, and troublesome construction of floor heating heat exchangers, and natural convection heat exchangers require a large heat exchange area to achieve sufficient heat exchange.
An indoor natural convection heat exchanger is designed, and a parallel pipeline structure of microchannel flat tubes is adopted. The refrigerant flow is optimized through inclined settings and flow baffles, forming a heat exchange surface of a smaller size, and a shell is set on the outside to form a chimney channel to improve the heat exchange efficiency of natural convection.
It realizes wind-free heating, has a small appearance and does not occupy indoor space. At the same time, it improves the efficiency of natural convection heat exchange, and can effectively increase the indoor air.
Smart Images
Figure CN222703858U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to an indoor natural convection heat exchanger, which is applicable to the technical field of heat exchange equipment. Background Art
[0002] In cold regions, heating has become a common means to improve living conditions. The most common method is to consume biomass energy such as coal, oil, gas or geothermal energy, or to use electric heating to generate heat. In addition to the geographical restrictions on energy acquisition, the above methods may also bring many other problems due to incomplete combustion, over-exploitation and low energy conversion ratio.
[0003] With the emergence of air energy heating, the energy conversion ratio has been greatly improved, providing a technical basis for saving electricity consumption. One of the most common ways of air energy heating is to blow hot air from the indoor unit in winter to warm up the house. Furthermore, the refrigerant of the indoor unit can be introduced into the floor heating heat exchanger laid in the concrete layer of the floor slab, so that the entire floor slab forms a huge heat exchange surface, and the air in the house is heated by natural convection, so that the house becomes warmer. However, the above two technologies have some disadvantages to a greater or lesser extent. The hot air blown out in winter often gathers on the ceiling, while the temperature near the floor slab is still relatively low, resulting in a very low perceived temperature for the human body, and the hot air is often affected by wind noise. In addition, the refrigerant circulates in the floor heating heat exchanger for heat exchange. Although there is no wind noise and the heat exchange efficiency is high, the floor heating heat exchanger needs to be laid in the concrete of the floor slab, and the construction and installation are more troublesome.
[0004] Regardless of whether forced convection or natural convection is used, the heat exchange of the heat exchanger is related to three factors: heat exchange coefficient, heat exchange area and heat exchange temperature difference. The above-mentioned indoor unit blowing hot air belongs to forced convection heat exchange, while floor heating belongs to natural convection heat exchange. For the heat exchange system that also uses an air source outdoor unit, the heat exchange temperature difference is often certain, and the heat exchange coefficient of the indoor heat exchanger using forced convection is often greater than the heat exchange coefficient using natural convection. The amount of heat required for a building to exchange heat with the external environment is also fixed. Only when the heat exchange area using natural convection is larger than the heat exchange area using forced convection, can the room obtain enough heat to heat up and maintain the required indoor temperature.
[0005] Based on the above, the heat exchange area using natural convection must be large enough, but the indoor space is used for living, and is filled with many furniture and daily facilities needed for daily life. If a large size is used for heating and it hinders people's indoor activities, although it is technically reasonable, it still has great disadvantages in use. Utility Model Content
[0006] The purpose of this application is to design an indoor natural convection heat exchanger, which has the technical advantages of small size, high heat exchange efficiency and high user experience.
[0007] The present application relates to an indoor natural convection heat exchanger, comprising an inlet port, a header, parallel pipelines and an outlet port, wherein the inlet port and the outlet port are both sealedly connected to the header or the inlet port and the outlet port are both arranged on the header, the number of the parallel pipelines is at least two, the parallel pipelines are connected between the headers, the parallel pipelines are microchannel flat tubes, and at least one channel for refrigerant flow is provided in the microchannel flat tubes.
[0008] Wherein, the microchannel flat tubes are arranged obliquely relative to the header, the microchannel flat tubes are arranged in an S shape, and a baffle is arranged in the header.
[0009] The present application also relates to an indoor natural convection heat exchanger, comprising a first collecting pipe, a second collecting pipe, a first parallel pipeline, a second parallel pipeline, a first collecting pipe and a second collecting pipe, wherein the two ends of the first parallel pipeline are respectively sealedly connected to the first collecting pipe and the first collecting pipe, and the two ends of the second parallel pipeline are respectively sealedly connected to the second collecting pipe and the second collecting pipe; the first parallel pipeline and the second parallel pipeline are inclined to the respective connected collecting pipes, and there is a spacing between the first parallel pipeline and the second parallel pipeline; the first parallel pipeline and the second parallel pipeline are microchannel flat tubes, and at least one channel for refrigerant flow is provided in the microchannel flat tubes.
[0010] Among them, an inlet interface and an outlet interface are also provided, the inlet interface is sealedly connected to the first collecting pipe and the second collecting pipe, and the outlet interface is sealedly connected to the first collecting pipe and the second collecting pipe; at least one of the first collecting pipe, the second collecting pipe, the first collecting pipe and the second collecting pipe is provided with a baffle.
[0011] The present application provides an indoor natural convection heat exchanger, which has a relatively small size through the reasonable arrangement of the heat exchange surface. The heat supplied by the air source outdoor unit can be used through the heat exchanger of the present application to exchange heat with the indoor air through natural convection heat exchange in the room, so as to heat up the indoor air. The heat exchanger of the present application has a small size while meeting the requirement of heating without wind noise, and will not have a great impact on the indoor activity space. In particular, a cover can be provided on the outside of the indoor natural convection heat exchanger of the present application, and a chimney channel can be formed between the two eight-shaped parallel pipelines and the one stroke of the eight-shaped parallel pipeline and the wall or the cover, which is more conducive to the natural convection of hot air and improves the heat exchange efficiency of natural convection. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1It is a schematic diagram of an implementation of the indoor natural convection heat exchanger of the present application.
[0013] Figure 2 It is a schematic diagram of the heat exchange effect of the indoor natural convection heat exchanger of the present application.
[0014] Figure 3 It is a schematic diagram of the parallel pipelines of the present application.
[0015] Figure 4 a-4c are schematic diagrams of three implementation methods of the parallel pipeline and header setting relationship of the present application.
[0016] Figure 5a-5b It is a schematic diagram of other implementations of the indoor natural convection heat exchanger of the present application.
[0017] Figure 6 It is a schematic diagram of another implementation of the indoor natural convection heat exchanger of the present application.
[0018] Figure 7 It is a schematic diagram of another implementation of the indoor natural convection heat exchanger of the present application.
[0019] Figure 8 It is a schematic diagram of another implementation of the indoor natural convection heat exchanger of the present application.
[0020] Fig. 9 yes Figure 7-8 Schematic diagram of the heat transfer effect of the indoor natural convection heat exchanger. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical solution and advantages of the present application clearer, the embodiments of the present application will be described in detail in conjunction with the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict. The microchannel flat tube of the present application has a common meaning in the industry, and those skilled in the art can fully understand its meaning without limiting the specific size range.
[0022] The indoor natural convection heat exchanger of the present application is mainly composed of an inlet port 1, a header 2, parallel pipes 3, a baffle 4 and an outlet port 5, as shown in FIG. Figure 1 As shown. The inlet port 1 and the outlet port 5 are both sealedly connected to the header 2, and more than two parallel pipelines 3 are provided on the heat exchanger. Both ends of the parallel pipelines 3 are sealedly connected to the header 2. A baffle 4 is provided on the header 2, which can change the flow direction of the refrigerant in the heat exchanger and realize the circulation flow in the parallel pipelines 3. In the natural convection heat exchanger of the present application, the refrigerant flows in from the inlet port 1 and is distributed by the header 2 to flow into the parallel pipelines 3, flows out from the parallel pipelines 3 and enters the header 2 again, and then flows out of the heat exchanger from the outlet port 5. The inlet port 1 is mainly used to connect with the connecting pipe of the outdoor unit.
[0023] The indoor natural convection heat exchanger of the present application is composed of two or more parallel pipes 3 to form a natural convection heat exchange surface, that is, to form a heat exchange area. Figure 2 As shown, the indoor air 8 obtains the heat of the heat exchanger through heat exchange from the bottom of the heat exchanger 6. The air temperature rises and the density decreases, so it gradually rises. In the rising process, it continuously exchanges heat with the heat exchange surface of the heat exchanger, continuously obtains heat, and gradually separates from the heat exchange surface of the heat exchanger and rises to the indoor space 7, so that the indoor space 7 forms a temperature field of natural convection heat exchange. As the heat of the heat exchanger is continuously released to the room, the entire temperature field gradually expands, and finally brings heat to the entire indoor space 7.
[0024] like Figure 1 and 6 As shown, the header 2 is generally a round tube, which is convenient for bearing the pressure of the refrigerant in the tube. Figure 5a-5b As shown in 7-8, in order to assemble with parallel pipelines of a certain width, the header 2 can be made into an oblate tube. The header 2 is provided with many holes or grooves to facilitate the installation of the parallel pipelines 3, and the header 2 and the parallel pipelines 3 are sealed by brazing and other processes. The parallel pipelines 3 use microchannel flat tubes, and there is at least one channel in the microchannel flat tube, which allows the refrigerant to flow from one header to another. The product of the number of parallel pipelines 3 and the channels in the parallel pipelines 3 is the number of channels through which the refrigerant flows.
[0025] The gap δ between the parallel pipelines 3 may be 0 or not. When the gap δ between the parallel pipelines 3 is not 0, the parallel pipelines 3 may be tilted at an angle α, and the angle α may be further understood as the angle formed by the line 33 formed by the pipe channels in the parallel pipelines 3 and the axis 21 of the header 2. That is, when α is 0, all the channels in the parallel pipelines 3 remain parallel to the axis of the header 2. At this time, the number of parallel pipelines 3 arranged on the limited length of the header 2 is the smallest, such as Figure 4 a; When α gradually increases from 0, more parallel pipelines 3 are placed in the limited length of the header 2, such as Figure 4 b; When α is 90°, the maximum number of parallel pipelines is arranged on the limited length of the header 2, such as Figure 4 c. When the gap δ between the parallel pipelines 3 is not 0 and the distance between the maximum area surfaces of the parallel pipelines 3 is further adjusted, more parallel pipelines 3 can be arranged on the limited length of the header 2. The more parallel pipelines 3 there are, the larger the heat exchange area of the heat exchanger. The outer dimensions of the header 2 also change adaptively with the inclination angle of the parallel pipelines 2.
[0026] like Figure 5a-5bAs shown, the parallel pipelines 3 can be arranged in a vertical direction or in a horizontal direction, and can be arranged in a horizontal direction and in a vertical direction, and with the change of the inclination angle, a variety of technical forms are generated. Figure 8 As shown, the parallel pipelines can be further bent into an S-shape, so as to obtain a smaller external size while ensuring the heat exchange area.
[0027] In another preferred embodiment, Figure 7 As shown, the natural convection heat exchanger of the present application includes an inlet port 1, a first header pipe 21 and a second header pipe 22, a first parallel pipeline 31 and a second parallel pipeline 32, a first header pipe 41 and a second header pipe 42, an outlet port 5 and a baffle 4 arranged inside the header pipe. The inlet port 1 is sealedly connected with the first header pipe 21 and the second header pipe 22. There are multiple first parallel pipelines 31 and second parallel pipelines 32 on the heat exchanger. The two ends of the first parallel pipeline 31 are sealedly connected with the first header pipe 21 and the first header pipe 41 respectively; the two ends of the second parallel pipeline 32 are sealedly connected with the second header pipe 22 and the second header pipe 42 respectively. The first parallel pipeline 31 and the second parallel pipeline 32 form an inclined angle with the headers connected to them, and there is a spacing between the first parallel pipeline 31 and the second parallel pipeline 32. The first header pipe 41 and the second header pipe 42 are further connected to the outlet port 5. In order to evenly distribute the heat exchange medium in the channels of each parallel pipeline, a baffle 4 can be set on the header, and the baffle 4 can also change the direction of the heat exchange medium. The heat exchange medium flows in from the inlet port 1, is distributed into two streams, and enters the first header pipe 21 and the second header pipe 22 respectively. After distribution, it flows into the first parallel pipeline 31 and the second parallel pipeline 32 respectively, and flows into the first header pipe 41 and the second header pipe 42 respectively, and flows out at the outlet port 5. The inlet port 1 and the outlet port 5 can be further connected to the outdoor unit, so that when the outdoor unit is driven, the heat exchange medium circulates in the heat exchanger for heat exchange.
[0028] Since the first parallel pipeline 31 and the second parallel pipeline 32 are inclined at an angle, a variable cross-section channel of hot air is formed, resulting in changes in flow rate and pressure. Fig. 9As shown, when the indoor air contacts the nth first parallel pipe 31 of the heat exchanger, the air exchanges heat with the heat exchange surface 31nB by natural convection, and the air rises and exchanges heat with the heat exchange surface 31n+1A of the n+1th first parallel pipe 31 again. The air gains heat again, and the density decreases to strengthen the upward momentum, and flows out in the narrow area formed by the n+1th parallel pipe 31 and the n+1th second parallel pipe 32. Thus, a negative pressure is formed at the n+1th first parallel pipe 31n+1B, which is conducive to replenishing the indoor air around the n+1th first parallel pipe 31n+1B. By analogy, as long as there is a temperature difference between the air and the surface temperature of the parallel pipe heat exchange surface, this effect always exists. Only when the air temperature is infinitely close to the surface temperature of the parallel pipe, this effect weakens or disappears. This effect increases the flow rate of air on the parallel pipe heat exchange surface, thereby promoting the heat exchange effect of natural convection. A cover can also be provided outside the natural convection heat exchanger of the present application to isolate and protect the natural convection heat exchanger, and can also form a chimney channel for hot air flow. That is, a chimney channel can be formed between two "eight" shapes and one "eight" shape of the parallel pipeline and the wall or the cover.
[0029] Although the implementation methods disclosed in this application are as above, the contents described are only implementation methods adopted for facilitating the understanding of this application, and are not intended to limit this application. Any technician in the technical field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be based on the scope defined in the attached claims.
Claims
1. An indoor natural convection heat exchanger, comprising an inlet, a header, parallel pipelines and an outlet, wherein the inlet and the outlet are both sealedly connected to the header or the inlet and the outlet are both arranged on the header, the number of the parallel pipelines is at least two, and the parallel pipelines are connected between the headers, characterized in that: The parallel pipelines are microchannel flat tubes, and at least one channel for refrigerant to flow is provided in the microchannel flat tubes.
2. An indoor natural convection heat exchanger according to claim 1, characterized in that: The microchannel flat tubes are arranged obliquely relative to the header.
3. The indoor natural convection heat exchanger according to claim 1, characterized in that: The microchannel flat tube is arranged in an S shape.
4. An indoor natural convection heat exchanger according to any one of claims 1 to 3, characterized in that: A baffle is arranged in the collecting pipe.
5. An indoor natural convection heat exchanger according to any one of claims 1 to 3, characterized in that: A cover is provided outside the indoor natural convection heat exchanger.
6. An indoor natural convection heat exchanger, characterized in that: It includes a first collecting pipe, a second collecting pipe, a first parallel pipeline, a second parallel pipeline, a first collecting pipe and a second collecting pipe, the two ends of the first parallel pipeline are respectively sealed with the first collecting pipe and the first collecting pipe, the two ends of the second parallel pipeline are respectively sealed with the second collecting pipe and the second collecting pipe; there is a distance between the first parallel pipeline and the second parallel pipeline, the first parallel pipeline and the second parallel pipeline are microchannel flat tubes, and at least one channel for refrigerant flow is provided in the microchannel flat tube.
7. An indoor natural convection heat exchanger according to claim 6, characterized in that: An inlet port and an outlet port are also provided. The inlet port is sealedly connected to the first inlet collecting pipe and the second inlet collecting pipe, and the outlet port is sealedly connected to the first outlet collecting pipe and the second outlet collecting pipe.
8. An indoor natural convection heat exchanger according to any one of claims 6-7, characterized in that: At least one of the first inlet collecting pipe, the second inlet collecting pipe, the first outlet collecting pipe and the second outlet collecting pipe is provided with a baffle.
9. An indoor natural convection heat exchanger according to any one of claims 6-7, characterized in that: The first parallel pipelines and the second parallel pipelines are arranged obliquely to the headers connected to them respectively.
10. An indoor natural convection heat exchanger according to any one of claims 6-7, characterized in that: A cover is provided outside the indoor natural convection heat exchanger.