| At present, there are no domestic standards about the thermal performance test ofradiant cooling terminals. Domestic products are intermingled with the good and thebad while the price of the imported is very high. What more important is that thedesigners cannot get the accurate performance parameters of the terminal so that theyhave no basic for equipment selection. All these above stand in the way of theextension of the radiant cooling air conditioning system in China. Therefore, theexperiment about the test methods of radiant cooling terminal thermal performanceand its correction methods in practical use in this article provide reference for makingstandards about the thermal performance test of radiant cooling terminal as well asgeneralizing this type of air conditioning.In this article, we make a detailed comparison of many abroad current standardsabout the thermal performance test of radiant cooling terminal, for instance, EN14240, EN15116, EN14518and ASHRAE138. By researching and analyzing themethods on how to make this standards and referring to the good thoughts amongthem, we finally find the methods suitable to our country in testing the radiant coolingterminals, which have been verified in a full-scale simulation room.Verified by measured result, the experiment has shown out a difference in coolingability of the terminal between the inner and the outer heat source models. Byanalyzing the result and establishing the theoretical calculation model of coolingceiling, we have analyzed the cooling capacity of the ceiling in test room withdifferent load, and then verified it with measured result. The correction relation of theradiant cooling ceiling in different loads can be concluded according to the simulationdata, thus providing guidance for the practical application of the radiation coolingceilings.Conclusions can be drawn by analyzing measured result and simulation data:1. Different types of heat sources in radiant cooling test would have an influenceon the result, and the external cooling load is generally higher than the internal load.2. The cooling ability of radiation cooling ceiling can also be affected by thegeometry of the room when the room has a signal external load surface. If the externalload surface is in the length direction, the bigger the length-width ratio, the stronger ofthe cooling ability. 3. It will have a significant influence to the test result on varies shadow area ofthe cooling ceiling, and the smaller the shadow area, the bigger the cooling ability inper effective cooling area of the ceiling. |
