Analysis Of The Influence Factors On Heat Transfer At The End Of Attached Capillary Tube

As Chinese economy continues to grow, building energy consumption increasingly accounts for the proportion. As the necessary equipment for the architecture, HAVC energy occupies a major share of the total energy consumption of the construction. Energy saving and environmental protection of HAVC can not be ignored. Temperature and humidity treatment method of heat and moisture coupling in traditional air conditioning system results in a great waste of energy. And there are shortcomings such as noise, draft sensation, uneven distribution of temperature and so on. Capillary network of radiation air-conditioning system is based on the principle of independent control of temperature and humidity. It use a new air conditioning system of radiation heat transfer. This system significantly improves indoor thermal environment and indoor comfort and avoids the waste of energy.This dissertation mainly researches on the existing capillary network-attached laying, and establishes a two-dimensional physical model for the heat transfer in the ground plaster layer. Also it uses the FLUENT software to conduct a mathematical simulation. The dissertation analyzes the effects of several different effects of the heat transfer the capillary network made by the different physical parameters. It detailed analysis of the capillary network of water temperature, indoor temperature, indoor air flow velocity, the wall thickness of the plaster layer, the impact of the heat transfer by the plaster material, the plaster layer temperature distribution along the direction of the heat transfer and the plaster layer temperature changes in the vertical direction.The results show that the material and thickness of the plaster layer have little effect on the thermal performance of the simulation experiments. Ceteris paribus, change the plaster layer material, wall temperature deviation is only 0.001℃, change the plaster layer thickness, wall temperature devation is only 0.56℃. The temperature changes have a certain extent effect on the thermal performance. Ceteris paribus, when indoor temperature increased from 26℃ to 28℃, wall temperature increase 0.763℃. The fluid temperature inside the capillary network and the indoor air flow rate has a big effect on the thermal performance. Change the temperature of the refrigerant in the capillary network, the maximum wall temperature devation is about 1.26℃. When the indoor air changed from a natural flow rate of 0.11 to a forced convection flow rate of 3, wall temperature increase 1.26℃. Under standard working conditions, when indoor minimum wall temperature is 19.812℃, indoor temperature is 26℃. By the humid air psychrometric chart, we know that to avoid moisture condensation, indoor air relative humidity should not exceed 68.74℃.This dissertation make the indoor heat transfer characteristics clear, when the capillary network-attached is laid. It provides a reference for design and construction.