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Research on Indoor Thermal Environment of Radiant Floor Cooling

Author: LingLin
Tutor: LiuFang
School: Chongqing University
Course: Urban construction safety engineering
Keywords: Radiant floor cooling Indoor thermal environment Numerical Simulation
CLC: TU831.3
Type: Master's thesis
Year: 2008
Downloads: 239
Quote: 5
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Abstract


The energy saving is one of the focus of global concern today. With the economic development and people's living standards improve, building air conditioning energy consumption continues to increase, it also increased the air-conditioned comfort and indoor air quality requirements. Radiant cooling system is considered to be an economical, energy-saving, comfort, good air-conditioning system in the form of research and application. This article briefly describes the radiant floor cooling mechanism and characteristics, and its simplified mathematical model, the establishment of a radiant floor cooling and the mathematical model of the numerical simulation of indoor thermal environment. Calculation region is divided into two parts - floor layer and the interior space of the simulation method, the calculation of the floor layer coil cold floor heat exchanger, the calculation of the indoor space including floor surface to maintain the structure of the radiation heat transfer and indoor air convection heat transfer. Of 3D mechanical CAD software PRO / E to establish a floor model of the coil, the coil model import CFD software - Airpak Airpak software to establish the form of floor structure and the building envelope, set the floor, water flow and physical properties of the building envelope parameters, the set coil and the boundary conditions of the room to be simulated. And the cold radiant floor laboratory experimental tests to verify the feasibility of the proposed simulation method. Radiant floor cooling system experimental results show that the indoor temperature in the case of the joint operation of the fan coil and floor coil, the vertical temperature distribution is uneven, the temperature gradient is relatively large. Using the CFD software Airpak simulated indoor thermal environment of the radiant floor cooling, the simulation results with the experimental results. And then verify that the proposed simulation method credibility floor radiant cooling indoor thermal environment, as well as the boundary of the program settings are correct. The simulation study results show that: the water temperature is constant, with the increase of water flow, the indoor temperature and floor surface temperature decreased; supply and return water temperature is constant, the floor surface and indoor temperature decreases with the increase of flow velocity in the pipe. The water flow is constant, as the water temperature rises, the indoor temperature and the floor surface temperature increase; certain time for the return water temperature, indoor temperature and the floor surface temperature rise as the water temperature increases. Under the same conditions as the water temperature and the calculated cooling capacity, large indoor temperature difference between supply and return water flow temperature is relatively low for small indoor temperature of the return water temperature flow, that is the large flow of small temperature effect of heat transfer; outdoor temperature fluctuations, floor radiant cooling the indoor air temperature changes, the radiant cooling with radiant heating as the self-regulatory function.

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