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Akabayashi S.-I.,Niigata University | Sakaguchi J.,Niigata University | Oshima T.,Niigata University | Ichikawa H.,Sanken Setsubi Kogyo Co. | Arinami Y.,Niigata University
AIJ Journal of Technology and Design | Year: 2014

A conventional selection criterion of room air conditioners based on rated performance is considered suboptimal from the standpoint of energy efficiency. In order to help consumers evaluate energy performance, annual performance factor (APF) was introduced in the 2005 revision of JIS C 9612. However, APF assumes thermal environment of Tokyo, which makes regional deviation of APF remain unknown. In the present study, rated coefficients of performance (COPs) and market prices of year 2012 models of air conditioners are collected. From the collection, APFs are calculated at nine representative cities in Japan to quantify regional characteristics of APF. Source


Shioya M.,Sanken Setsubi Kogyo Co. | Kohri K.,Utsunomiya University
AIJ Journal of Technology and Design | Year: 2014

We built the calculation method concerning the heat performance of a ceiling slit radiant panel and indoor thermal environment affected by radiant cooling and heating into the BEST. The calculated values of the heat quantity and indoor thermal environment using the BEST incorporating this calculation method give close agreement with the actual measured values. Therefore, this calculation method is useful when simulating heat quantity, status of water supply and indoor thermal environment from the conditions of a building and ceiling radiant panels. Source


We developed the versatile calculation method concerning the heat performance of a ceiling radiant panel and indoor thermal environment affected by radiant cooling and heating system. This method replaces the ceiling radiant panel with pipe to which the heat performance is equal, and calculates the radiation heat transfer and the convection heat transfer. The calculated values of the heat quantity are substituted for the equations of zone heat balance in consideration of the transfer of heat between living space and ceiling space by the slit. And the equations are solved by the explicit method. Source


Sako H.,Takenaka Corporation | Sako H.,University of Tokyo | Takahashi M.,Takenaka Corporation | Shioya M.,Sanken Setsubi Kogyo Co. | Kuwahara R.,Sanken Setsubi Kogyo Co.
AIJ Journal of Technology and Design | Year: 2010

This paper reports design method of office HVAC system utilizing radiant ceiling panel, natural ventilation, under floor air-conditioning. Performance of radiant panel and acceptable dew point in the office are studied. PMV control method applies for the office HVAC system in order to consider radiant environment and keep the office thermal environment comfortable. HVAC operation modes are defined considering outside air condition and dew point in the office toward energy conservation. Source


Shioya M.,Sanken Setsubi Kogyo Co. | Kohri K.,Utsunomiya University | Kito N.,Sanken Setsubi Kogyo Co.
Journal of Environmental Engineering (Japan) | Year: 2013

In the design of a ceiling radiant cooling and heating system, it is important to calculate the indoor thermal radiantenvironment and heat performance of a ceiling radiant panel. From the results of heat performance experiment, weclarified the radiative and convective heat transfer coefficient of a ceiling panel . And we developed the heat exchangeequation model of a ceiling radiant panel using fin efficiency. The calculated values of the heat quantity using this modelgive close agreement with the actual measured values. Therefore, this model can be used to design ceiling radiant panels. Source

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