| Being a new kind of heating style, much research has been done to the low-temperature water floor radiant heating system in its energy consumption, but which doesn't get an unanimous result. The research in the optimization of system design is in great need to promote its using.Based on the thermal conservation principle, a thermal net model is established for the heated space, which can undergo dynamic analysis to the thermal environment of heated space and go on the heating system performance assess.Using the Matlab tools, a computer program is compiled to solve this mathematic model, by which simulations to the thermal environment of the heated space under different heating style are carried out. The simulations results and their analysis show that for different space with the same thermal comfort index, the energy consumption of low-temperature water floor radiant heating system is less than that of convection heating system.For the space heated by low-temperature water floor radiant heating system, the mean radiant temperature and air temperature are two main factors that affect the indoor thermal quality as well as the building energy consumption, so how to minimize the heating load as much as possible on the condition of securing thermal comfort demand? Given the thermal physical parameters of the envelops and the weather data, the above two parameters are determined by the following system design parameters: radiant panel dimension, radiant panel location and radiant panel layout style(center or peripheral).Based on the thermal net model, digital analysis of the energy consumption and thermal environment are carried out to the several representative spaces under different design parameters, through which the relations of the heating load to the design parameters are obtained and can be a reference in the practical system design.This paper also introduces the feedback control system based on the operativetemperature. |
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