Human thermal physiological and psychological responses under different heating environments

Wang, Zhaojun; Ning, Haoran; Ji, Yuchen; Hou, Juan; He, Yanan

doi:10.1016/j.jtherbio.2015.06.008

Cited by 39 publications

(13 citation statements)

References 14 publications

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“…The heating terminals could be categorized into two main types: fan coils and radiant heating terminals. Compared with the fan coils system, the radiant heating system could not only avoid occupants discomfort caused by the generated strong draft sensation but also utilize the low-grade energy [5,6]. Radiant heating terminals have been experimentally and numerically investigated, mainly including the radiator and radiant floor [7].…”

Section: Introductionmentioning

confidence: 99%

Defrosting Performance Improvement of Air-Source Heat Pump Combined Refrigerant Direct-Condensation Radiant Floor Heating System with Phase Change Material

et al. 2020

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Traditional defrosting methods applied to solve frosting problems of air-source heat pumps operating in cold periods may reduce heat capacity of the system and decrease indoor thermal comfort. In order to improve the performance of air-source heat pump (ASHP) and maintain indoor temperature in defrosting conditions, an air-source heat pump combined with a refrigerant direct-condensation radiant floor heating system with phase change material is proposed and evaluated in this study. Two radiant floor heating terminals with and without composite phase change material modules were compared through experiments. A composite phase change material based on dodecanoic acid-tetradecanol-hexadecanol mixture and expanded graphite was investigated for this application. Experimental results indicate that both heat fluxes of two comparing terminals are higher than 70 W/m2 in heating condition. At the same time, the floor surface temperature, indoor air temperature, and heating capacity of the terminal with composite phase change material modules are higher than those without composite phase change material modules in defrosting condition. This suggests that the proposed system with composite phase change material modules can improve indoor thermal comfort in defrosting condition as well as satisfy the heating requirement in heating condition.

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Section: Introductionmentioning

confidence: 99%

Defrosting Performance Improvement of Air-Source Heat Pump Combined Refrigerant Direct-Condensation Radiant Floor Heating System with Phase Change Material

et al. 2020

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“…A limited number of research papers on thermal sensation have been published investigating the relationship between thermal sensation and temperature (Chatonnet and Cabanac 1965 ; Gagge et al 1967 ; Zhang et al 2004 ; Ouzzahra et al 2012 ; Wang et al 2015 ; Gerrett et al 2015b ). Hence this study characterized the relationship between thermal sensation and physical contact temperature, a factor that critically underpins our understanding of thermosensory testing.…”

Section: Discussionmentioning

confidence: 99%

“…Recent research has widely adopted the application of a conductive thermal probe to the skin of human participants to investigate inter-individual and regional variability in the response to hot, cold, and wet thermosensory stimuli (Stevens et al 1974 ; Nakamura et al 2008 ; Ouzzahra et al 2012 ; Filingeri et al 2014a ; Gerrett et al 2015a ; Coull 2019 ). Previous research has demonstrated a linear positive relationship between thermal sensation and air temperature during whole-body exposure (Chatonnet and Cabanac 1965 ; Gagge et al 1967 ; Zhang et al 2004 ; Wang et al 2015 ), however, the assumption that thermal sensations evoked during the application of a conductive thermal probe would also be linearly related to the stimulus temperature, may not be well founded, and has not been researched. Alternative theoretical foundations could include for example a sigmoidal relationship, in which any given increment in physical temperature would elicit a greater change in thermal sensation when close to the thermoneutral zone, compared with the same physical temperature increment applied at the extremes of hot and cold.…”

Section: Introductionmentioning

confidence: 99%

An examination of five theoretical foundations associated with localized thermosensory testing

et al. 2021

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Purpose To assess five theoretical foundations underlying thermosensory testing using local thermal stimuli. Methods Thermal sensation, discomfort and the confidence of thermal sensation scores were measured in 9 female and 8 male volunteers in response to 17 physical contact temperature stimuli, ranging between 18–42 °C. These were applied to their dorsal forearm and lateral torso, across two sessions. Results Thermal sensation to physical temperature relationships followed a positive linear and sigmoidal fit at both forearm (r2 = 0.91/r2 = 0.91, respectively) and lateral torso (r2 = 0.90/ r2 = 0.91, respectively). Thermal discomfort to physical temperature relationships followed second and third-order fits at both forearm (r2 = 0.33/r2 = 0.34, respectively) and lateral torso (r2 = 0.38/r2 = 0.39, respectively) test sites. There were no sex-related or regional site differences in thermal sensation and discomfort across a wide range of physical contact temperatures. The median confidence of an individual’s thermal sensation rating was measured at 86%. Conclusion The relation between thermal sensation and physical contact temperature was well described by both linear and sigmoidal models, i.e., the distance between the thermal sensation anchors is close to equal in terms of physical temperatures changes for the range studied. Participants rated similar thermal discomfort level in both cold and hot thermal stimuli for a given increase or decrease in physical contact temperature or thermal sensation. The confidence of thermal sensation rating did not depend on physical contact temperature.

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“…Still, this result has a weak statistical significance. A study performed in China indicated the perception of air as dryer when using floor heating systems than when using radiant heating systems, although relative humidity was higher [ 16 ]. A statistically significant difference was found between humidity values measured at each place for students who perceived the cold thermal sensation and on the other hand students who perceived the warm thermal sensation.…”

Section: Discussionmentioning

confidence: 99%

Certain personal and environmental factors as predictors of thermal sensation perceived by a population of students in a university setting from Timisoara, Romania: a case study

Petrescu

2017

Environ Health Prev Med

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BackgroundThe aim of the performed study was to investigate personal and environmental factors as predictors of thermal sensation perceived by a population of students in a university setting.MethodsThe study consisted of two samples, a winter sample (154 students: 44.2% males and 55.8% females, aged 19–30 years) and a spring sample (147 students: 52.4% males and 47.6% females, aged 19–30 years), randomly selected from the same population of students. The method was an observational inquiry (case study) with a standardized questionnaire (11 items, 3 items for thermal sensation assessing through 3 scales with 3, 5 and 7 steps, alpha Cronbach’s index 0.854) applied and establishing 3 microclimate factors (air temperature, relative humidity and wind velocity), with calculation of normal effective temperature. The survey was performed over four successive days, during two seasons (winter—February and spring—May).ResultsThe performed study demonstrated a tendency of students to perceive the comfortably cold more frequently than comfortably warm throughout the 4 days of the survey during the winter, except Monday. Thermal sensation of discomfort was more frequently perceived as warm than cold throughout the spring time of the survey and winter, except Tuesday. Predictors of thermal sensation perceived by students in the amphitheatre were as follows: nationality (−2loglikelihood change or chi square = 42.12, Sig. 0.000), relative humidity (chi square = 10.65, Sig. 0.005) and gender during the winter, and wind velocity (change in −2loglikelihood = 11.96, Sig. 0.001) and nationality during the spring.ConclusionsCertain personal and environmental factors were suggested as predictors for thermal sensation perceived by a population of students in a study setting.

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Human thermal physiological and psychological responses under different heating environments

Cited by 39 publications

References 14 publications

Defrosting Performance Improvement of Air-Source Heat Pump Combined Refrigerant Direct-Condensation Radiant Floor Heating System with Phase Change Material

Defrosting Performance Improvement of Air-Source Heat Pump Combined Refrigerant Direct-Condensation Radiant Floor Heating System with Phase Change Material

An examination of five theoretical foundations associated with localized thermosensory testing

Certain personal and environmental factors as predictors of thermal sensation perceived by a population of students in a university setting from Timisoara, Romania: a case study

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