Optimization Analysis of Cold Storage Insulation Structure Zheng Dayu, Wang Guanhong, Liu Weifang, Yan Tao (School of Energy and Architectural Engineering, Harbin University of Commerce, Harbin 150024, China) Analysis of heat transfer performance of temperature structure; based on the analysis results, the original technology has been improved. The improved technology uses a combination of two insulation materials (polyurethane and polystyrene block); the improved technology is compared with the original technology; the analysis results show that the initial investment of the improved technology is at the middle level compared with the original technology; The economic benefits and the heat preservation effect are obviously improved, effectively overcoming the shortcomings of the prior art and reducing the maintenance cost.

Date of receipt: 2011 -), male, doctor, professor, research direction: refrigeration and cryogenic engineering.

As an important part of cold storage building, cold storage insulation has attracted more and more attention from the industry. The existing cold storage enclosure structure mainly adopts the polystyrene board or polyurethane m. The structure of the polystyrene board insulation layer is a polystyrene board layer in the bare wall, the concrete layer in the polystyrene board, and the wall inner board in the concrete layer. . The disadvantage of this kind of insulation layer is that the corners of the two walls or the corners of the wall and the ceiling easily form a cold bridge, which affects the heat transfer coefficient of the envelope structure and increases the cooling capacity. 0. The polyurethane insulation structure is polyurethane sprayed on the inner surface of the wall, and then in it Stick the wall inside the board. However, due to the high price of polyurethane, such a retaining structure is often expensive. H. This paper solves the above problems by combining two kinds of insulating materials.

1 Cold storage insulation structure research model 1.1 Selection of relevant parameters Select common cold storage, between frozen storage, storage temperature is -20 °C as the basic condition of research H. Library wall is standard 49 wall heat transfer coefficient is 0.7WKm2 K), exterior wall The area m2 of the insulation layer needs to be added. At this time, according to the summer outdoor temperature 35C. 1.2 heat transfer performance model, the heat transfer performance index is firstly used to evaluate the polyurethane insulation layer and the polyphenyl insulation layer and the improved composite insulation layer respectively. .

Where: R is the thermal resistance of the insulation layer, (m2K) / W; 5 is the thickness of the insulation layer, m; A is the thermal conductivity of the insulation layer; a is the correction factor. 1.2.1 The thermal resistance of the polyurethane insulation layer is selected according to the actual conditions and the parameters required for the modeling.

25.0 / g, density is 27.52kg / m3 polyurethane material thermal conductivity: A according to the design requirements of the selected external wall insulation thickness is 8cm; according to the cold storage design specifications, the correction factor is selected 1.4; external wall insulation thermal resistance calculation, substitution type (1) Calculated 2.36 (m2 1.2.2 polystyrene board thermal insulation layer thermal resistance: according to the actual situation and modeling requirements parameters. Use extruded polystyrene board (EPS), thermal conductivity A = 0.040 (W / m3 0 according to The thickness required for the design requirements is generally 15cm; the inner wall is in accordance with the cold storage design specification, and the correction factor is selected. 1.3. Polystyrene board insulation layer thermal resistance calculation polyurethane polystyrene board composite material 2.3 Applicability analysis Polyurethane insulation layer is widely applicable and expensive .

The polystyrene board insulation layer is easy to damage because the polystyrene board is loose, and the material itself is susceptible to biological damage, and the use environment is limited. Moreover, the polystyrene board insulation layer will generate a cold bridge during installation and use, which will affect the overall insulation effect of the cold storage. Even if the cooling capacity generated by the cold bridge is balanced by thickening the insulation layer, the inventory near the cold bridge is easily deteriorated due to temperature instability, which affects the efficiency of the entire cold storage.

Because the surface of the new composite insulation layer is a polyurethane layer, it overcomes the loose structure of the polyphenylene insulation layer and is easy to receive the problem of biological damage, effectively eliminating the cold bridge and at the same time being economical.

3 Conclusion Based on the heat transfer performance index and economic index as the standard, the research model of cold storage insulation layer structure was established, and the model was used to analyze the structure of different cold storage insulation layers. The new composite insulation material insulation layer has excellent heat transfer performance, good. Engineering applicability, as well as significant economics. Therefore, it has high engineering application value.

(Finish)

Flange

Welded neck flange, slip on flange, blind flange, lapped flange, threaded end flange, socket end flange, forged steel WN flange, A105N WN flange, A105N blind flange, A105N blind flange, A105N slip on flange, F304 WN flange, F316 WN flange, F304 slip on flange, F316 slip on flange, Nickle Alloy flange, ASME B16.5 flange, ASME B16.47 flange, EN1092-1 flange, LF2 flange, RF flange, RTJ flange, large male and female flange

Stainless Steel Flange,Pvc Flange,Companion Flange,Threaded Flange

SUZHOU RSF VALVE CO.,LTD , https://www.rsf-valve.com

Posted on