Heat and mass transfer core body with gradually-changed air duct spacing

Abstract

The utility model relates to the technical field of fresh air heat recovery, in particular to a heat and mass transfer core body with gradually-changed air duct spacing. The core comprises a plurality of core units stacked in the same direction, each core unit comprises two single-layer structures arranged in a countercurrent mode and a heat and mass transfer membrane arranged between the two single-layer structures, and each single-layer structure comprises a frame and a plurality of separation ribs arranged in the frame. A plurality of air channels are formed between the frame and the separation ribs and between every two adjacent separation ribs, and the intervals of the air channels are distributed in a gradually changing mode; the air duct with the largest interval is the air duct which is firstly contacted when outdoor fresh air enters the heat and mass transfer core body, the air duct with the smallest interval is the air duct which is finally separated when the outdoor fresh air is discharged out of the heat and mass transfer core body, the gradual change rule from the air duct with the largest interval to the air duct with the smallest interval is that the interval is gradually reduced, and the reduction proportion is gradually increased. According to the technical scheme, efficient heat energy recovery can be achieved, and the air circulation efficiency of the system can be kept.

Description

Technical Field

[0001] This utility model relates to the field of fresh air heat recovery technology, and in particular to a heat and mass transfer core with a gradually varying air duct spacing. Background Technology

[0002] The heat and mass transfer core is a key component in high-efficiency fresh air heat recovery systems. It primarily recovers heat and humidity from exhaust air within the ventilation system to improve energy efficiency. The core operates on the principle of heat and mass exchange between two independent airflows, typically one being exhaust air from the building and the other being fresh outdoor air. Compared to sensible heat exchange cores, the heat and mass transfer core can recover and utilize the entire energy in the air, i.e., enthalpy. Through its efficient heat and mass exchange process, the core can significantly reduce the heating and cooling loads of a building, thereby lowering energy consumption and operating costs.

[0003] Total heat exchange efficiency and drag are two key indicators for evaluating the performance of heat and mass transfer cores. Generally, there is a trade-off between these two parameters: an increase in total heat exchange efficiency is often accompanied by an increase in drag. This is because improving total heat exchange efficiency requires increasing the path length and complexity of airflow through the heat and mass transfer core, which increases airflow resistance.

[0004] Therefore, when designing a heat and mass transfer core, a balance needs to be found between total heat exchange efficiency and resistance to ensure both efficient heat recovery and maintenance of the system's airflow efficiency. Utility Model Content

[0005] This utility model provides a heat and mass transfer core with a gradually varying air duct spacing, which can achieve efficient heat recovery while maintaining the air circulation efficiency of the system.

[0006] This utility model provides a heat and mass transfer core with a gradually varying air duct spacing, comprising multiple core units stacked in the same direction. Each core unit includes two counter-current single-layer structures and a heat and mass exchange membrane disposed between the two single-layer structures. Each single-layer structure includes a frame and multiple partition ribs disposed within the frame. Multiple air ducts are formed between the frame and the partition ribs, as well as between two adjacent partition ribs. The spacing of the air ducts is gradually distributed.

[0007] The air duct with the largest spacing is the first air duct that outdoor fresh air comes into contact with when it enters the heat and mass transfer core, and the air duct with the smallest spacing is the last air duct that outdoor fresh air leaves when it exits the heat and mass transfer core. The gradual change from the air duct with the largest spacing to the air duct with the smallest spacing is that the spacing gradually decreases and the percentage decrease gradually increases.

[0008] This utility model provides a heat and mass transfer core with a gradually varying duct spacing. By designing the duct spacing as a gradually decreasing distribution, that is, the duct with the largest spacing gradually decreases in size from the duct with the smallest spacing, and the decreasing percentage gradually increases. This can reduce the differences in air velocity, temperature and humidity in adjacent ducts, and enhance the uniformity of the flow field, temperature field and water vapor concentration field in adjacent ducts. This enables efficient and low-resistance heat and mass exchange, and balances the total heat exchange efficiency and resistance, ultimately forming a duct structure for a novel heat and mass transfer core that balances performance and energy consumption. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the single-layer structure in the heat and mass transfer core provided in this embodiment of the utility model;

[0011] Figure 2 This is a schematic diagram of the structure of a heat and mass transfer core with gradually varying air duct spacing provided in an embodiment of this utility model.

[0012] Figure label:

[0013] 1-Frame; 2-Separating rib; 3-Air duct; 4-Assembly positioning hole; 5-Connecting rib; 6-Assembly boss; 7-First assembly groove; 8-Second assembly groove. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0015] like Figure 1 and Figure 2As shown, this utility model embodiment provides a heat and mass transfer core with a gradually varying air duct spacing 3, including multiple core units stacked in the same direction. Each core unit includes two counter-flow single-layer structures and a heat and mass exchange membrane disposed between the two single-layer structures. Each single-layer structure includes a frame 1 and multiple partition ribs 2 disposed within the frame 1. Multiple air ducts 3 are formed between the frame 1 and the partition ribs 2 and between two adjacent partition ribs 2. The spacing of the air ducts 3 is gradually distributed.

[0016] The air duct with the largest spacing 3 is the first air duct 3 that outdoor fresh air comes into contact with when it enters the heat and mass transfer core, and the air duct with the smallest spacing 3 is the last air duct 3 that outdoor fresh air leaves the heat and mass transfer core when it is discharged. The gradual change from the air duct with the largest spacing 3 to the air duct with the smallest spacing 3 is that the spacing gradually decreases and the percentage of decrease gradually increases.

[0017] In this embodiment, by designing the spacing of the air ducts 3 as a gradually decreasing distribution, that is, the gradual change from the air duct with the largest spacing 3 to the air duct with the smallest spacing 3 is that the spacing gradually decreases and the reduction ratio gradually increases, the differences in air velocity, temperature and humidity in adjacent air ducts can be reduced, and the uniformity of the flow field, temperature field and water vapor concentration field in adjacent air ducts can be enhanced. This enables efficient and low-resistance heat and mass exchange, a balance between total heat exchange efficiency and resistance, and ultimately forms a new type of air duct structure that balances performance and energy consumption.

[0018] After installation and testing, for cores of the same size and using the same type of polymer heat transfer and moisture permeability membrane, the air duct arrangement described in this invention, compared to the equidistant air duct arrangement, resulted in a lower performance within 200m. 3 Under the condition of / h air volume, the total heat exchange efficiency is similar, and the resistance decreases by about 16%. Therefore, the above technical solution achieves a balance between performance and energy consumption, improves the overall performance level of the total heat exchange core, reduces energy consumption and operating costs, and has a good energy-saving and environmental protection effect.

[0019] In one embodiment of this utility model, there are ten partition ribs 2 and eleven air ducts 3.

[0020] In this embodiment, the inventors established a heat and mass transfer core performance prediction simulation program based on CFD technology, which can quickly and accurately obtain the total heat exchange efficiency of the total heat exchange core under cold recovery and heat recovery conditions. When the total heat exchange efficiency is the highest, the number of partition ribs 2 is ten and the number of air ducts 3 is eleven.

[0021] In one embodiment of this utility model, the single-layer structure is made of plastic material.

[0022] In one embodiment of this utility model, the frame 1 has six side borders (i.e., a hexagonal structure), and the side borders are provided with assembly positioning holes 44 for precise assembly.

[0023] In one embodiment of this utility model, both the frame where the air inlet is located and the frame where the air outlet is located are provided with connecting ribs 5. The connecting ribs 5 are used to connect the frame 1 and the partition ribs 2 to enhance the structural stability.

[0024] In one embodiment of this utility model, two side frames parallel to the counterflow duct 3 are provided with mounting bosses 6 and first mounting grooves 7, and a single-layer mounting boss 6 can cooperate with another adjacent single-layer first mounting groove 7.

[0025] In one embodiment of this utility model, a second mounting groove 8 is provided on two side frames other than the side frame where the air inlet is located, the side frame where the air outlet is located, and the two side frames parallel to the counterflow air duct 3. A second mounting groove 8 of a single-layer structure can cooperate with a connecting rib 5 of another adjacent single-layer structure.

[0026] In this embodiment, by enabling the mounting boss 6 of a single-layer structure to mate with the first mounting groove 7 of another adjacent single-layer structure, and enabling the second mounting groove 8 of a single-layer structure to mate with the connecting rib 5 of another adjacent single-layer structure, precise alignment and sealing during assembly can be ensured, reducing the core leakage rate. After installation testing, the core leakage rate is ≤1.2%.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A heat and mass transfer core with gradually varying air duct spacing, characterized in that, The device includes multiple core units stacked in the same direction. Each core unit includes two counter-flow single-layer structures and a heat and mass exchange membrane disposed between the two single-layer structures. Each single-layer structure includes a frame and multiple partition ribs disposed within the frame. Multiple air ducts are formed between the frame and the partition ribs and between two adjacent partition ribs. The spacing of the air ducts is gradually distributed. The air duct with the largest spacing is the first air duct that outdoor fresh air comes into contact with when it enters the heat and mass transfer core, and the air duct with the smallest spacing is the last air duct that outdoor fresh air leaves when it exits the heat and mass transfer core. The gradual change from the air duct with the largest spacing to the air duct with the smallest spacing is that the spacing gradually decreases and the percentage decrease gradually increases.

2. The heat and mass transfer core with gradually varying air duct spacing according to claim 1, characterized in that, The number of the dividing ribs is ten, and the number of the air ducts is eleven.

3. The heat and mass transfer core with gradually varying air duct spacing according to claim 1, characterized in that, The single-layer structure is made of plastic.

4. The heat and mass transfer core with gradually varying duct spacing according to any one of claims 1-3, characterized in that, The frame has six borders, and the borders are provided with assembly positioning holes.

5. The heat and mass transfer core with gradually varying air duct spacing according to claim 4, characterized in that, Both the frame where the air inlet is located and the frame where the air outlet is located are provided with connecting ribs, which are used to connect the frame and the partition ribs.

6. The heat and mass transfer core with gradually varying air duct spacing according to claim 5, characterized in that, Two side frames parallel to the counterflow duct are provided with mounting bosses and first mounting grooves, and the mounting boss of one single-layer structure can cooperate with the first mounting groove of another adjacent single-layer structure.

7. The heat and mass transfer core with gradually varying air duct spacing according to claim 6, characterized in that, In addition to the two frames where the air inlet is located, the air outlet is located, and the two frames parallel to the counter-flow air duct, a second mounting groove is provided on each of the two frames. The second mounting groove of one of the single-layer structures can cooperate with the connecting rib of another adjacent single-layer structure.

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