Establishment And Validation Of Heat Transfer Model Of Thermally Active Building Systems

Concrete core cooling is a new air-conditioning technology combining energyefficiency with thermal comfort. Compared with traditional air-conditioning systems,concrete core air-conditioning system has a significant difference in which thebuilding itself is the terminal of the concrete core air-conditioning system. Since therelatively large heat capacity of the concrete, heat transfer process of air-conditioningsystem becomes more complex as the building participating in. Studying the heattransfer process inside the concrete slab is of great significance for the master of thethermal dynamic response of concrete room, the design of concrete core coolingsystem and the operation of technical systems.This article summarized the research of domestic and foreign scholars on the heattransfer process of concrete core panel. Regarded the response coefficient method tosolve the unsteady heat transfer in the plate wall as a breakthrough, heat transferwithin the concrete process was divided into three sub-processes by the coretemperature layer. The two-dimensional heat transfer model of concrete core panels isestablished. A three-dimensional heat transfer model is established by adding theimpact of the water flow on the heat transfer based on the two-dimensional heattransfer model. Ultimately a comprehensive heat transfer model is establishedconsidering the heat gain of air-conditioned room and the cooling capacity of theconcrete core panel. The GUI interfaces for each of the three heat transfer modelswere established. The tests of the panel on a variety of different experimentalconditions in the chamber which equipped with a concrete radiation air-conditioningsystem were conducted. The experiment included four steady conditions and sevenunsteady conditions. Three different heat transfer models were verified by the testdata. Error analysis between experimental data and simulated data is conducted andBland-Altman method is used to verify the consistency of the two kinds of data. PDEToolbox of MATLAB is used to build concrete core finite element model, which isused to discuss the scope of two-dimensional heat transfer model.The following results were summarized.1. Three heat transfer models of concrete core cooling system were established,and appropriate GUI interfaces were setup by programming. 2. The tests of the concrete core cooling system on different experimentalconditions were conducted in the concrete core cooling system chamber. And erroranalysis together with consistency verification between experimental data andsimulated data were conducted, and the simulation error of the models was small.3. This article discussed the scope of two-dimensional heat transfer model byfinite element model method.