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Simone A.,Technical University of Denmark | Kolarik J.,Technical University of Denmark | Iwamatsu T.,Tokyo Metroplitan University | Asada H.,Architech | And 4 more authors.
Energy and Buildings | Year: 2011

Application of the exergy concept to research on the built environment is a relatively new approach. It helps to optimize climate conditioning systems so that they meet the requirements of sustainable building design. As the building should provide a healthy and comfortable environment for its occupants, it is reasonable to consider both the exergy flows in building and those within the human body. Until now, no data have been available on the relation between human-body exergy consumption rates and subjectively assessed thermal sensation. The objective of the present work was to relate thermal sensation data, from earlier thermal comfort studies, to calculated human-body exergy consumption rates. The results show that the minimum human body exergy consumption rate is associated with thermal sensation votes close to thermal neutrality, tending to the slightly cool side of thermal sensation. Generally, the relationship between air temperature and the exergy consumption rate, as a first approximation, shows an increasing trend. Taking account of both convective and radiative heat exchange between the human body and the surrounding environment by using the calculated operative temperature, exergy consumption rates increase as the operative temperature increases above 24 °C or decreases below 22 °C. With the data available so far, a second-order polynomial relationship between thermal sensation and the exergy consumption rate was established. © 2010 Elsevier B.V. All rights reserved.

Iwamatsu T.,Japan Central Research Institute of Electric Power Industry | Asada H.,Architech | Fukai Y.,Ecology Life HANA | Fukuda H.,Tokyo Electric Power Company | Shukuya M.,Tokyo City University
Journal of Environmental Engineering | Year: 2010

This paper discusses the relationship between the indoor thermal conditions provided by a high-temperature radiative cooling system mounted on the ceiling and thermal cognition given by the subjects experiencing its thermal environment in an experimental room simulating common living conditions in residential buildings. The subjects accepted the indoor thermal environment with high relative humidity over 70 % provided that both of the mean radiant and air temperatures kept at 29°C and the air movement exceeds 0.15m/s. We also calculated the human-body exergy balance for indoor thermal conditions that the subjects voted most for "comfort". Under such a condition, the cool radiant exergy received by the human body was approximately 30mW/m 2 and thereby the warm exergy was emitted efficiently from the human body by radiation and convection into the room space. This amount of warm exergy emissions was are larger than that in an air-conditioned room space. Therefore, radiant cooling is not to provide a large amount of cool radiant exergy with occupants, but to provide a sufficient amount in order for the human body to release warm exergy smoothly from the human body surface; that is for spontaneous entropy disposal.

Shukuya M.,Tokyo City University | Iwamatsu T.,Japan Central Research Institute of Electric Power Industry | Asada H.,Architech
International Journal of Exergy | Year: 2012

This paper briefly describes the human-body exergy balance equation developed so far applying a variety of formulae derived from the fundamentals of thermodynamics, namely the concepts of wet/dry exergy associated with moist air and liquid water, warm/cool exergy transferred by radiation and convection. A couple of numerical examples of the whole human-body exergy balance are given and discussed in relations to mean radiant temperature, room air temperature, air velocity, and outdoor environmental temperature. We have found so far that it is very important to control the amount of thermal radiant exergy in room space both in winter and in summer. Copyright © 2012 Inderscience Enterprises Ltd.

Tazawa S.,Architech | Ueno K.,Kansai Electric Power Co. | Sakamoto Y.,University of Tokyo | Kawaraguchi Y.,Architech
AIJ Journal of Technology and Design | Year: 2010

This paper describes performance tests of home heating equipments. The tests were carried out under an artificial climate chamber to evaluate thermal room environments and energy conservation performances conducted by several heating equipments. A new test method and a correction related to insulation of the test chamber are proposed for such evaluations. Test results are shown with comparisons among the heating equipments, and radar charts regarding five items are presented.


Architech | Date: 2016-12-16

Facade panels for building construction comprising thermal collectors and a transparent or semitransparent cover made with integrated photovoltaic cells.

News Article | September 7, 2015

Labour Day has been celebrated on the first Monday in September in Canada since the 1880s. The origins of Labour Day in Canada can be traced back to December 1872 when a parade was staged in support of the Toronto Typographical Union's strike for a 58-hour work-week. In honour of Labour Day and its Toronto roots, Techvibes is offering up free tickets to our upcoming Tech Fest Toronto recruiting event to our job-seeking, Toronto readers. Techvibes Tech Fest, a one-of-a-kind event that brings together the fastest growing companies and job seeking talent. On September 16th enjoy delicious appetizers and a Steam Whistle beer while meeting some of the executive team and hiring managers from Achievers, Architech, Big Viking Games, Clio, EventMobi, Flipp, FreshBooks, Intelex, Intuit, Prophix Software, Shopify, Sulon Technologies, Top Hat, Uberflip, Unata, VarageSale, and Zomato. Use discount code 'LabourDay' when registering online to take advantage of this limited-time offer. Job Seeker tickets will be free for the first ten readers to take advantage of this offer. NOTE: This offer is valid for new Tech Fest Toronto registrations only and no refunds will be made on previously purchased tickets.

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