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The Applied Research of the Solar Power Thermocompression Ventilation Roofing

Author: TangHuiQiang
Tutor: LongEnShen
School: Chongqing University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Solar hot Ventilated roof Ventilation Temperature field Velocity field
CLC: TU83
Type: Master's thesis
Year: 2008
Downloads: 280
Quote: 2
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Abstract

Southern summer sunshine time is long, and solar radiation intensity, the outer surface is usually horizontal roof integrated air temperature reaches 60 ~ 80 ℃, top-floor room indoor temperature lower than the room temperature to be higher than 2 ~ 4 ℃. While top-floor room indoor thermal environment is primarily influenced by the indoor radiation, roof thermal performance directly affects the indoor thermal comfort. Based on the traditional southern floor tiles ventilated roof insulation performance is poor, raise laying foil insulation and the use of hot air shaft mounted pull enhanced ventilation interlayer ventilation effect, improve the traditional floor tiles ventilated roof insulation performance of research programs. Presents a good day and insulation, new energy-saving heat quickly at night roofing, namely solar hot roof ventilation. This paper studies a pure hot conditions, the first solar hot Ventilation Roof insulation performance is analyzed theoretically, and then create a computer model using FLUENT software simulation analysis, simulation focus is on solar roof ventilation in hot different solar radiation intensity, the air between the layer height, pulling air shaft width, pulling air shaft exit width, pulling air shaft height, pull the wind parameters such as the number of wells under the influence of simulated solar hot air flowing through the ventilation roof ventilation channels, and compared with analysis to identify various parameters on the roof ventilation channel ventilation were studied. And, to simulate the resulting solar ventilation roof ventilation channel hot air temperature and velocity field of the analysis, the corresponding conclusions. Finally, through experiments, the solar hot ventilation roof ventilation with heat insulation effect of solar radiation intensity, pulling air shaft height, pull the air shaft exit width variation while getting solar hot ventilation roof ventilation channel temperature and velocity fields Variation: With the increase in the intensity of solar radiation, solar hot roof ventilation gradually increasing the amount of natural ventilation; solar hot ventilation roof ventilation with natural ventilation shaft exit width pull increases; pull air shaft height increases hot air to bring the solar roof significantly increased the amount of ventilation; roof air temperature within the air passage along the direction of the ventilation channel height gradually decreases, the temperature in the boundary layer, the velocity gradient is very large; ventilation passage from the roof at the wall 50mm, along the channel length direction of the roof, the air temperature increases sharply at first (via transition flow), the stable increase (turbulence stage); along the height direction of the roof channel, the air speed closer to the channel center, the greater its value, and with the gradual flow increases. Experimental and simulated results show a good agreement, which proves the correctness of the simulation model. Experimental testing of solar hot air inside and outside roof surface temperature by time value and the corresponding value of the indoor temperature of the room, the results show that the role of solar hot air roof insulation foil accounted for about 40% of the solar wind well pulling hot air heat exchanger 60 percent; solar hot air than traditional floor tiles roof ventilation roof maximum temperature of the inner surface of the low 2.6 ℃, average daily low temperature 1.6 ℃; solar hot air inside the roof surface temperature change is gradual, the daily average temperature is 27.6 ℃, maximum temperature of 28.45 ℃, the temperature range of only 0.85 ℃.

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