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Research on Low Temperature Water Radiant Heating Characteristic of PCM Wallboard

Author: ShiGuanYu
Tutor: YuYanShun
School: Nanjing University of Technology and Engineering
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Phase Change Wall Low temperature hot water Radiant heating Heat storage and heat release
CLC: TU832.16
Type: Master's thesis
Year: 2009
Downloads: 189
Quote: 3
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Abstract


Energy-saving and environmental protection is an important issue in the field of energy use . At present, the temperature radiant heating technology is recognized worldwide as one of the effective ways to solve the energy and environmental issues . Phase change energy storage has the advantages of small changes in temperature , and heat storage density , therefore , used in the construction of phase change materials can increase the performance of building envelope thermal storage , thereby reducing the indoor temperature fluctuations , increase comfort , improve building thermal properties. Given the energy and environmental problems facing our country , on the basis of the low-temperature hot water radiant floor heating system , combined with the phase change thermal storage characteristics , the new concept of low temperature hot water active phase change wall radiant heating system . Wall of the reservoir in order to study the active phase change heat release characteristics , this article on the basis of the analysis of the phase change heat transfer theory , the low temperature hot water active phase change wall radiant heating system to do a series of reasonable simplification using enthalpy method modeling wall layers of two-dimensional non- steady-state heat transfer model ; numerical simulation using FLUENT software , to study the phase transition temperature , latent heat , phase change layer thickness , water temperature , diameter, tube spacing , room temperature, coils laying position change of the average surface temperature of phase change wall surface heat flux density and ability to build exothermic , summarized the influence of phase change wall heat transfer process . The results show that : the phase transition temperature increases , the phase change layer is thinned , the supply and return temperature is increased , the tube spacing becomes small or the diameter increases , will cause the wall of the average surface temperature and heat flux increased significantly . The results of this study of the low-temperature hot water active promotion and application of phase change wall radiant heating systems play a theoretical guidance .

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