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Composite floor radiant cooling system simulation

Author: ZhangYao
Tutor: LiWeiYi
School: Tianjin University
Course: Thermal Power Engineering
Keywords: Radiant floor cooling Displacement ventilation Computational Fluid Dynamics Numerical Simulation Energy
CLC: TU831
Type: Master's thesis
Year: 2007
Downloads: 272
Quote: 3
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Abstract


Radiant floor heating has many advantages because around the world have been widely used. But the use of the same set of cooling systems rarely . If you pass into the cold water in the pipes for cooling in summer , you do not need a separate set of cooling equipment , and can make full use of underground heat for summer cooling provides a new way to the end . At present , the domestic floor heating technology matures, some areas have introduced technical specifications used to guide construction. But for floor cooling research is far from enough , theoretical research is far from perfect , really applies to very few cases of practical engineering . The heat transfer is calculated floor structure system design and operation management foundation , floor heat transfer model of floor cooling characteristics for a deeper understanding of great significance . In this paper, radiant floor cooling heat transfer process carried out a detailed analysis , at the conclusion on the basis of previous experience , radiant floor heat transfer process to establish a mathematical model and use Visual Basic compiled based on two-dimensional heat transfer cooling floor model calculation procedures, the use of the program studied tube spacing , diameter , depth and surface layer parameters such as the impact of cooling capacity for the floor and water parameters and indoor temperature on the cooling effect flooring , access to a series of valuable calculations for engineering design has a certain significance. Using commercial software Fluent were used hybrid displacement ventilation and air conditioning systems were simulated indoor thermal environment , and the introduction of the relative temperature and relative air speed indicator for comparing two indoor environment temperature gradient and velocity gradient distribution of the indicators for the condition is not exactly the same air-conditioned room has the advantage of fairness . For hybrid and traditional air-conditioned rooms air-conditioned room were compared , using the energy balance method and CFD method compares two kinds of air-conditioned room at different times of the wall temperature and external loads , and to analyze the surface emissivity on the floor of the room cooling load cooling significant impact load that is the key to reducing the room reduces the emissivity of the surface material , and presents the composite air-conditioning room wall inner surface convective heat transfer coefficient should use a smaller value , the final analysis on the floor under the condition of cooling energy advantage.

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