Journal
INDOOR AND BUILT ENVIRONMENT
Volume 29, Issue 4, Pages 527-542Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1420326X19869412
Keywords
Radiant floor cooling system; Ventilation; Thermal comfort; Computational fluid dynamics; Equivalent temperature
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Funding
- National Natural Science Foundation of China [51608310]
- Science and Technology Plan Project of University in Shandong Province [J16LG07]
- Innovation Team of the Co-Innovation Center for Green Building of Shandong Province in Shandong Jianzhu University
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This study conducted a series of computational fluid dynamics simulations to evaluate the thermal comfort performance of a radiant floor cooling system when combined with different ventilation systems, including mixed ventilation (MV), stratum ventilation (SV), displacement ventilation (DV) and ductless personalized ventilation (DPV). A window temperature of 32 degrees C and three different floor temperatures including 20, 22 and 24 degrees C were set in summer. We used the vertical air temperature differences (VATD) at ankle and head level, the percentage of dissatisfied, the draught rate at the ankle level and the equivalent temperature as our main evaluation indices. Our results show that the VATD in DV system can reach up to about 5 degrees C, compared with about 2 degrees C in MV and SV systems. For the DPV system, there is only a marginal drop in the VATD. For the DV and DPV cases, with a rate of air changes per hour (ACH) of 2.4(-1), we recorded a higher draught rate at the ankle level, ranging from 6.55% to 9.99%. The lower equivalent temperature values for the foot and calf segments occur when the floor temperature is 20 degrees C. In all cases, the equivalent temperature values of the whole body indicate an acceptable level of thermal discomfort.
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