地板供暖系统实现人工环境中的热舒适性 毕业论文外文翻译.doc
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1、内蒙古科技大学毕业设计说明书K.A.Antonopoulos.M.Vrachopoulos.c.TzivanidisNational Technical University of Athens. Mechanical Engineering Department.Thermal Section.42 Patission Street.Athens.106 82.GreeceReceived 5 february 1998Text Floor Heating : Achieving Thermal Comfort in ArtificialEnvironmentsModern man dema
2、nds high levels of thermal comfort in artificial environments.Linked to this international pressure grows to reduce demand on the earths energy reserves. Modern technology has made great strides forward in developing new innovative heat sources but probably the greatest advance in combined thermal c
3、omfort and energy conservation is the modern wet floor heating system. The advent of high quality plastics pipes has made possible the utilization of low temperature water in floor heating systems perfectly compatible with the new heat source technology. Fully developed for all types of floor constr
4、uction, U.F.H. combines types of heat, conduction, radiation and convection, matching the ideal temperature gradient throughout an entire building. The safe, invisible, space saving, vandal and tamper proof system is both responsive and energy conscious offering passive self regulation.Thermal comfo
5、rt can be defined as the state of mind where satisfaction id felt with the thermal environment. Research shows that people feel most comfortable when their feet are a little warmer than their heads. Independent tests reveal that the most acceptable indoor climate is one in which the floor temperatur
6、e ranges between ninetentytwenty-nine and the air temperature at head level ranges between twenty and twenty-four. However, since individuality is integral to all human activity it is not possible to specify one set of environmental conditions which will meet all cases. The best results we are likel
7、y to achieve depend on a 5% dissatisfaction factor. There is no temperature that will please everyone, but we can aim to establish a comfort zone that will satisfy the highest possible percentage of those using the area.With radiator or convector heating systems a vertical temperature gradient is pr
8、oduced; colder at foot level than at the head. A modern indoor climate surely demands a heating system which will match the required conditions for human thermal comfort with the principal heating effect being evenly distributed at ground level and not above head level. We have seen that warm feet c
9、reate good sensations, so let us examine the effect upon the indoor climate if we warm the whole floor to just the right temperature.We have touched on improvements in building standards but no amount of insulation can change the laws of physicheat still rises. Efficient insulation will, however, se
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