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Performance Research and Structure Optimization of Total Heat Exchanger

Author: TaoYe
Tutor: ZhangShuangXi
School: Qingdao Technological University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: total heat exchanger membrane thermal conductivity moisturepermeability airflow distribution structure optimization
CLC: TU83
Type: Master's thesis
Year: 2013
Downloads: 11
Quote: 0
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Abstract


With the improvement of people’s living standard, people have higherrequirements for indoor air qualities. On the other hand, policies about energy-savingand emission reduction are put forward due to energy crisis. Therefore, there is acontradictory between improving indoor air quality and saving energy. The total heatexchanger in HVAC field is one of ideal equipments solving the above contradictory,which has received the widespread attention at home and abroad and also has a broadapplication prospect.In this paper, for improving the efficiency of total heat exchangers and enhancingthe market competitiveness of our domestic products, the further research were doneabout size and structure of channel, preparation and performance of membranes, and theoverall structure of the total heat exchangers based on a common plate type heatexchanger in the domestic market. The main work and conclusions are as follows:(1) Influences of structure of channel, secondary heat transfer surface, windwardairflow distribution on the total heat exchanger efficiency was studied with numericalsimulation method. The results show that: a) for the plate type heat exchanger, thesecondary heat transfer surface should be taken into account, b) the channel structurewith regular triangle provides better efficiency than others, c) using high heatconductivity fin material, the total heat exchanger efficiency of system can beimproved.(2) The moisture diffusion coefficient of the membrane used was measured withequipment which specially designed in this work. And also, the thermal conductivity ofthe membrane was measured. With the results of the measurement and the SEM image,the influence of microstructure of the membrane on moisture absorption behavior wasstudied. Results show that: a) the moisture content of membrane has a significantimpact on membrane thermal conductivity, b) the membrane with neat internal structure,nanopore and uniform space distribution has efficient moisture permeation property.(3) The influence of distribution in windward side of core on the total heatexchanger efficiency was studied with experiment and numerical simulation method.The results show that: a) the distribution in windward side of core is non-uniform, dueto the whirlpool and reflux caused by the unreasonable structure of the entrance, b) the distribution has significant impact on the total heat exchanger efficiency.(4) With the research results above, a modified plate type heat exchanger wasestablished. In order to verify the total heat exchanger efficiency, a test platform for thetotal heat exchanger was established in this work. Compared with the original one, themodified plate type heat exchanger provides a better total heat exchanger efficiency.In conclusion, a modified plate type heat exchanger with higher total heatexchanger efficiency was established. The researches in our work provide theoreticalfoundation and guidance for the optimization design of total heat exchanger.

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