A Study on Estimation Methods of Heat Output in Hot Water Floor Heating Systems

Abstract

This paper discusses estimatj ． on methods of steady state and unsteady state heat output in hot water fユoor heatlng systems ・ It beco皿es clear that Kollmar − Liese ' s meth6d vhich has been popu ユ ar 王 y used ， underestimates steady state heat transfer rate fro田 the fユoDr ． The authors propose a 1】 ew simple estimation method by applying DOE(Design of Experi 皿 ents) method ． On the other hand， there has been no simple estimation method for unsteady state two − dimensional heat transfer in floor heating systems ． In this paper ， precise respQnses of heat transfered frQm the fユoor obtained by two − dimensiona1 ． calculations are analyzed and classified ， and represen し ative responses are expressed by exponential polynomia ユ aPproximatio 【 ｝ ． Keywords：hot water fユoor heating system ， simp ユ ified estimation method ， DOE， steady sta し e heat output ， step response of heat output

Heat Loss from Hot Water Floor Heating System to Crawl Space: Field Survey and Improvement of Energy Consumption

“…Shimizu (1999) produced an experimental device in order to investigate the thermal output from a floor heating system. Inoue et al (1997) discuss simplified estimation methods of heat output in hot water floor heating systems. But the energy consumption of the floor heating system in residential house, where people are living, has not been reported so much.…”