Thermal Comfort Assessment of Tropically Acclimatized Occupants in an Air Conditioned Microenvironment
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ORIGINAL CONTRIBUTION
Thermal Comfort Assessment of Tropically Acclimatized Occupants in an Air Conditioned Microenvironment Jayashree Arumugam1 • M. P. Prakash Maiya1 • S. M. Shiva Nagendra1
Received: 8 August 2019 / Accepted: 10 August 2020 Ó The Institution of Engineers (India) 2020
Abstract Air conditioning is a predominant technique widely used to condition the indoor environment. Thermal comfort of occupants in an air conditioned microenvironment depends on several factors. In the present study, we have investigated the influence of indoor operative temperature, air velocity and thermal sensation of tropically acclimatized subjects in air conditioned microenvironment. A classroom size of 31 students (subjects) was considered in the present investigation. Several experiments were conducted in a microenvironment by varying indoor operative temperature between 25.5 and 29.7 °C and air velocity from 0.1 to 0.25 m/s. The results indicate that the thermal sensation vote of subjects was always above 80%. The neutral comfort temperature from the present study (28 °C) is comparable with the Griffiths comfort temperature (27.7 °C). The present study reveals that cooling asymmetry is a cause of concern for subjects in the air conditioned room since the air was directed toward the head and back of subjects.
D Gcons hr hc Icl,i Icl_tot NV PMV RC RH TSV Tcomf Ta Tg Tmrt Trm Top va r e
Globe diameter (m) Griffiths constant Radiative heat transfer coefficient (W/m2 K) Convective heat transfer coefficient (W/m2 K) Individual clothing insulation (clo) Total clothing insulation (clo) Naturally ventilated Predicted mean vote Radiant cooling Relative humidity (%) Thermal sensation vote Comfort temperature (°C) Air temperature (°C) Globe temperature (°C) Mean radiant temperature (°C) Running mean outdoor temperature (°C) Operative temperature (°C) Air velocity (m/s) Stefan Boltzmann constant (W/m2 K4) Globe emissivity
Keywords Thermal comfort Air conditioned system Radiant cooling system Ceiling fan Hot and humid climate Random forest
Introduction List of AC AMP AMS
Symbols Air conditioning Air movement preference Air movement sensation
& S. M. Shiva Nagendra [email protected]; [email protected] 1
Environmental and Water Resource Engineering Division, Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600036, India
The number of hours spent by an individual indoors has increased with the dawn of the internet era, and improving indoor thermal comfort has become a necessity. Air conditioning (AC) systems are widely used around the globe to enhance indoor comfort. The indispensable increase in the concrete jungle and the associated increase in the number of AC units have made the cities a heat island. Air conditioning systems are energy intensive, and an alternative
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J. Inst. Eng. India Ser. A
technique to curb stress on the electric grid is the need of the hour. The adaptive thermal comfort model suggests that humans adapt themselves to external climatic conditions. P
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