Abstract
The authors developed a new radiant air conditioning system named ceiling radiant textile air conditioning system with ceiling cassette unit of packaged air conditioner (PAC). The nonflammable textile is stretched under the ceiling with ceiling cassette units of PAC with a distance of around 30 cm. The aim of this study is to investigate the cooling performance of this new radiant system, so the experiments with full scale model were conducted for three system. The first system is “textile only”, the second system is “textile with guide for air return grille” and the third system is “textile with guide and opening for air return grille”. Airflow rate through textile is measured by tracer gas method. In all cases, the vertical temperature distribution is almost uniform, and the cooling effect of “textile with guide and opening for air return grille” is the largest. As for the radiant effect, two systems of “only textile” and “textile with guide for air return grille” are superior to “textile with guide and opening for air return grille”. The airflow rate trough textile is doubled when using guide, and increased by five times if the opening was provided under the guide.
Highlights
As a radiant air conditioning system[1], water supply type system is usually used [2], but sometimes it is avoided due to the risk of water leakage in the case of earthquake in the countries with frequent earthquakes like Japan
The authors are developing a new radiant air conditioning system based on air using packaged air conditioner (PAC) (Packaged Air Conditioner) on the ceiling
It is known that this kind of PAC often cause draft of occupants due to high velocity of supply jets from the units, but this new radiant air conditioning system can eliminate the risk of discomfort caused by the draft
Summary
As a radiant air conditioning system[1], water supply type system is usually used [2], but sometimes it is avoided due to the risk of water leakage in the case of earthquake in the countries with frequent earthquakes like Japan. Various air supply types of radiant air conditioning system are gradually developed [3][4], and being used in commercial buildings. It is known that this kind of PAC often cause draft of occupants due to high velocity of supply jets from the units, but this new radiant air conditioning system can eliminate the risk of discomfort caused by the draft. Due to the instability caused by cold and dense air above the textile, the cold air in the space above the textile flows down to the indoor space through the textile. This airflow induces the reverse airflow entering the upper space above the textile. The problem is whether enough mount of airflow rate can be obtained or not, so the other device might be needed to increase the exchange airflow rate
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