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Performance Study of Intermittently Reversing Total Heat Exchanger

Author: CuiZhongJian
Tutor: LiuGang
School: Donghua University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Numerical solution Sensible heat efficiency The efficiency of the latent heat Full thermal efficiency Pressure loss
CLC: TU831.4
Type: Master's thesis
Year: 2010
Downloads: 44
Quote: 0
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Abstract


With China's rapid economic development, energy use has increased substantially. Building energy consumption, which account for a growing proportion of the recent years due to the high increase in the construction area and unit building energy consumption. On the other hand, it is given more attention than ever on the indoor air quality. Guarantee the quality of indoor air is bound to increase the indoor air fresh air, doing so increases the energy consumption. Air heat recovery technology on a good solution to this problem. Intermittent change to the total heat exchanger as an effective air heat recovery technology, can effectively alleviate a contradiction. The subject according to the structural features and operating characteristics of the intermittent change to the total heat exchanger, the sensible heat and latent heat to be dealt with separately. According to the working characteristics of the part of the sensible heat and latent heat, the establishment of the independent mathematical model. As regards the commutation time the parameters, we used a temperature frontier theory to the time portion of the sensible heat exchange studies, Theory solved for the commutation time the solution, and then under the experimental latent heat part of the commutation time is to be checked . Application matlab calculate the mathematical model, the numerical solution. According to the calculated results, described the impact of the structural parameters of the heat exchanger and operating parameters of the effect of heat exchanger. According to the characteristics of the intermittent commutation full heat exchanger, build a test-bed of simulated operating conditions. The experimental value obtained to verify the correctness of the numerical solution. Experimental Study of the portion of the sensible heat portion and latent heat combination in a certain way, the efficiency of the sensible heat and latent heat changes in the efficiency, the results show that the composition after the efficiency of the sensible heat and latent heat efficiency has improved significantly, the pressure loss also will increase. Also studied the case of three different structural forms of the total heat exchanger, and the performance of several different absorbent materials in a total heat exchanger. For total heat exchanger of the study in the test of the three structures, a first structure has a high efficiency of the efficiency of the sensible heat and latent heat, and having a low pressure loss, the third structure significantly the thermal efficiency and the lowest latent heat efficiency, pressure loss The highest efficiency and pressure loss of the second between the middle of these two structures. Absorbent material is jute and silica a total heat exchanger under the same structure and operation disclosed in the efficiency and pressure loss, the results show that silica gel as a total heat exchanger in the absorbent material has a high efficiency of the sensible heat and latent heat, and having a low pressure loss.

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CLC: > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Air-conditioning > Air-conditioning machinery and equipment
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