| Author: | Yang, Junran |
| Title: | Experimental investigation of thermal comfort in outdoor radiant cooling system |
| Advisors: | Niu, Jianlei (BEEE) |
| Degree: | M.Eng. |
| Year: | 2023 |
| Subject: | Human comfort Heat -- Radiation and absorption Heat -- Transmission Cooling Human engineering Hong Kong Polytechnic University -- Dissertations |
| Department: | Department of Building Environment and Energy Engineering |
| Pages: | vii, 54, 3 pages : color illustrations |
| Language: | English |
| Abstract: | A preliminary experimental and survey study of thermal comfort in a radiant cooling system was carried out. Groups of 34 subjects aged 23-30 were invited to experience the radiant cooling system and to vote for their thermal perception. They were divided into two groups and completed the survey in an environmental chamber with air temperatures (Ta) of 30°C and 35°C respectively. During each 1-h experiment, the subject was exposed to three radiant surface temperatures and was asked about his or her real-time overall thermal sensation and satisfaction with the environment. The questionnaire was designed to investigate the impact of subjects' standing orientations, radiant cooling device chiller set temperature (Tc), and response times on thermal perception. The cooling capacity of the radiant cooling panels and the thermal comfort index (UTCI) of the environment were calculated and compared with those obtained from the survey. It was found that people gave the most positive feedback in the lower ambient temperature group (30°C) when the chiller was set at a minimum temperature of 8°C. Thermal comfort level was improved after subjects facing the board for 3 mins. At higher air temperatures, the radiant cooling panel has a limited effect in improving thermal comfort, the increment of cooling capacity is not directly reflected in the subjects' thermal comfort level. To compare the survey results with UTCI, the UTCI of groups, which Ta are at 35 and 30°C, are in the 'Strong heat stress' and 'Moderate heat stress'. The results do not match the thermal preference in the questionnaire, indicating that the UTCI is not fully representative of people's thermal comfort. The experiment validates the conjecture that radiant cooling panels provide limited thermal comfort at higher air temperatures and provides reference and support for future investigations in outdoor environments. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 7177.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.58 MB | Adobe PDF | View/Open |
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