Method for carrying out performance analysis and optimal design on paper core total heat exchangers for building air conditioning, heating and ventilation
A technology of total heat exchanger and optimized design, applied in instrumentation, calculation, special data processing applications, etc., can solve the problems of easy divergence, low calculation results, lack of optimization design methods, etc.
Active Publication Date: 2018-01-30
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology
In the early stage, the theoretical analysis method was mostly used. In recent years, with the rapid development of computer technology and computational fluid dynamics, the application of numerical simulation method (CFD numerical method) is increasing day by day. The relationship between humidity and temperature, mass transfer coefficient and heat transfer coefficient. At present, these two methods have a common deficiency in performance analysis or optimal design of paper core heat exchangers. Repeated iterative calculations with humidity and humidity to meet the requirements of heat and moisture exchange energy and water vapor mass conservation between the two, the entire calculation process is cumbersome and inefficient, and the calculation results are prone to divergence
In addition, for the optimal design of paper-core total heat exchangers, most of the current methods are only applicable to specific structural forms of paper-core total heat exchangers, which are not universal. For some structural forms of paper-core total heat exchangers, optimal design methods are still lacking state
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[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0042] In this embodiment, the structural size of the hexagonal paper core heat exchanger is known, refer to figure 1 , the vertical height of the hexagonal cardboard is a=110mm, the length of the straight side is b=110mm, the angle between the two hypotenuses is β=60°, the distance between the sheets of the paper core is D=2mm, and the height is H=400mm. Fresh air inlet parameters: pressure temperature t freshin =32(℃), relative humidity Indoor exhaust air inlet parameters: pressure temperature t dischargein =26(℃), relative humidity In winter, the inlet temperature and humidity of outdoor fresh air and indoor exhaust air are respectively: t freshin =0(℃), t dischargein =20(℃), relative humidity Paper core total heat exchanger handles air volume V fresh =V discharge =V=150(m 3 / h), analyze the performance of the above-mentioned hexago...
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The invention discloses a method for carrying out performance analysis and optimal design on paper core total heat exchangers for building air conditioning, heating and ventilation. The method comprises the following steps of: calculating partial pressure, moisture content and specific enthalphy of inlet vapor of a fresh air inlet and an exhausted air inlet according to inlet pressure, temperatures and relative humidity of the fresh air inlet and the exhausted air inlet; calculating a face velocity, a corresponding Reynolds number, a heat transfer coefficient and a mass transfer coefficient according to a given structure size and a treated volume, and solving a quadratic equation with one unknown so as to obtain a fresh air outlet speed; and finally calculating other parameters of the fresh air outlet, parameters of an exhausted air outlet, a total heat transfer amount and a total heat efficiency of an exchanger, if obtained results do not satisfy requirements, improving the structureor structure parameters of the exchanger to carry out above calculation again, analyzing factors causing performance differences of the paper core total heat exchanger before and after correction andchange rules of the factors, and continuously improving the structure or structure parameters of the exchanger until the performance of the paper core exchanger achieves the requirements. According tothe method disclosed by the invention, malpractices of temperature and humidity iterative computation of existing methods are overcome; and the method is not limited to forms or size forms of exchangers, and has the characteristics of being simple, efficient and universal.
Description
technical field [0001] The invention relates to the technical field of paper-core total heat exchangers, in particular to a method for performance analysis and optimal design of paper-core total heat exchangers for building air-conditioning and heating. Background technique [0002] The paper-core total heat exchanger is a fresh air energy-saving device with broad development prospects in the field of building air conditioning and HVAC. The device uses specific fiber paper as the heat and mass transfer surface for outdoor fresh air and indoor exhaust air for heat and moisture exchange ( That is, total heat exchange), through which the outdoor fresh air is pre-cooled (heated) and dehumidified (humidified) by the dirty air discharged from the room in summer (winter) season, and enters the room with a temperature and humidity close to the indoor air. At the same time, the energy of the exhausted air is recovered to process the fresh air, which effectively reduces the building a...
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Inventor 赵敏戴会明蔡文剑吴学红董豪炳杨亚飞王会宾
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY