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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.


Tarumi H.,Kanazawa Institute of Technology | Kanda N.,Kanazawa Institute of Technology | Kuwahara R.,Sanken Setsubi Kogyo Co. | Sakamoto Y.,Chiyoda Corporation | And 2 more authors.
AIJ Journal of Technology and Design | Year: 2015

PMV control system was applied for a ceiling radiation cooling/heating system utilizing groundwater as heat source/sink. The purpose of this study is to clarify that the power consumption of this radiation air-conditioning system is small as compared with convection air-conditioning system. Through the experiments of summer and winter seasons, the power consumption of the radiation system dropped to 50% of the convection system in summer and dropped to 65% in winter without power consumption of a makeup air unit.


Sato H.,Niigata University | Sato H.,Sanken Setsubi Kogyo Co. | Akabayashi S.-I.,Niigata University | Sakaguchi J.,Niigata University | Kuwahara R.,Sanken Setsubi Kogyo Co.
Journal of Environmental Engineering | Year: 2010

Natural ventilation has the effect on improving the comfort of the indoor environment. However, this effect has not been clarified since it is difficult to artificially reproduce the same airflow as natural cross ventilation. In this study, the psychological and physiological effects of fluctuating airflow on the human body in hot summer environment were evaluated. The subjective experiments were carried out in a climatic chamber with fluctuating airflow generator, which can generate three airflows with different properties. The following results were obtained. (1)The thermal comfort is obtained by the natural cross ventilation most. Even after the airflow stops, the thermal comfort can be maintained. (2)The allowable environment can be reproduced by using the fluctuating airflow in a hot environment. Especially, the natural cross ventilation is psychological and physiological effective.


Tarumi H.,Kanazawa Institute of Technology | Sakamoto Y.,Kanazawa Institute of Technology | Kuwahara R.,Sanken Setsubi Kogyo Co. | Nishizawa M.,Sanken Setsubi Kogyo Co. | Iwase K.,Sanken Setsubi Kogyo Co.
AIJ Journal of Technology and Design | Year: 2014

PMV control system was applied for a ceiling radiation cooling/heating system utilizing groundwater as heat source/sink. System improvements including extension of the ceiling radiation panel and inverter control of pumps were carried out in the 2012. The research results in summertime cases are summarized below: 1) Indoor PMV values were settled in the range of 0.2-0.6 which was narrower than the previous year. 2) The power consumption of the pumps dropped to 1/3 of the previous year, and that of the whole system containing an makeup air unit dropped to 2/3.


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.


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.


Tarumi H.,Kanazawa Institute of Technology | Kobayashi Y.,Kanazawa Institute of Technology | Kuwahara R.,Sanken Setsubi Kogyo Co. | Iwase K.,Sanken Setsubi Kogyo Co. | Okazaki T.,Sanken Setsubi Kogyo Co.
AIJ Journal of Technology and Design | Year: 2013

PMV control system was applied for a ceiling radiation cooling/heating system utilizing groundwater as heat source/sink. Evaluation was based on the three season measurements of summer operation. The research results are summarized below: 1) Indoor PMV values were settled in the range of 0-1. 2) As compared with room temperature control, PMV values in the room under PMV control became low about 0.2. 3) The hunching phenomenon at night was canceled. 4) In PMV control, almost same indoor thermal environment was realized by the case which put the control position on the wall, and the case which placed the control position in the center of the room.


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.


Sako H.,Takenaka Corporation | Sako H.,University of Tokyo | Takahashi M.,Takenaka Corporation | Shioya M.,Sanken Setsubi Kogyo. Ltd. | Kuwahara R.,Sanken Setsubi Kogyo. Ltd.
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.

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