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The Research on Experiment and Numerical Simulation of Air-to-Earth Heat Exchanger with Concentric Tube

Author: ZhangJianBo
Tutor: LongEnShen
School: Chongqing University
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Soil air heat exchanger Casing Outlet air temperature Soil temperature field
CLC: TU833
Type: Master's thesis
Year: 2008
Downloads: 168
Quote: 0
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Abstract


Soil air heat exchanger absorbs heat from the soil, the soil releases heat to the cooling time. Soil temperature is higher than the outdoor temperature in winter and summer temperatures below the outdoor temperature, it can be used for summer cooling and winter heating. By using soil air heat exchangers can also reduce the use of coal, saving oil, natural gas and other primary energy will help countries improve the energy structure and reduce harmful gas emissions so as to protect the environment and sustainable development objectives. Therefore, use of soil for new wind energy for cooling is energy, green way of heating and air conditioning is a potential for development of the project. Currently the common soil air heat exchanger tube is horizontal, for our city densely populated countries with scarce arable land resources, land space saving way standpipe should not be ignored. We combine the vertical ground source heat pump casing, the establishment of a vertical tube under different conditions and soil heat transfer three-dimensional mathematical model to simulate the casing fluid flow and heat transfer, heat transfer tube with soil and soil temperature field. In order to improve efficiency, adapt to the development trend of numerical calculation, we use a mathematical model GAMBIT modeling software to calculate numerical calculation software FLUENT. Significance of the study lies in guiding practice, therefore the focus of this study there are two points: First, numerical simulation at different operating conditions casing soil air heat exchanger outlet air temperature and soil temperature field: two are imported by numerical studies wind speed (wind), the inlet temperature, soil physical parameters, diameter, into the wind and the length of the sleeve tube heat exchanger of different factors on the outlet air temperature. In the simulation calculations get a lot about the casing soil air heat exchanger outlet air temperature and soil temperature field characteristics of the data, through a detailed analysis of these data, for casing soil air heat exchanger designed to provide some reference. Finally, we built the casing soil air heat exchanger bench to conduct field tests by numerical simulation data with what we build bench comparing measured data to verify the correctness of the mathematical model. Due to constraints, this article only dry air and soil heat exchange processes were simulated and analyzed, and compared with the measured data for wet-air heat exchange process simulation analysis, to be further in-depth.

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