Journal
BUILDING AND ENVIRONMENT
Volume 194, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.buildenv.2021.107716
Keywords
Radiant cooling terminal; Sensible and latent heat transfer; Thermal response speed; Surface temperature uniformity; Cooling capacity; Forced convection
Funding
- National Science Foundation for Distinguished Young Scholars of China [51825802]
- China National Key R&D Program Solutions to heating and cooling of buildings in the Yangtze river region [2016YFC0700303]
- Innovative Research Groups of the National Natural Science Foundation of China [51521005]
Ask authors/readers for more resources
This study developed a novel radiant cooling terminal integrated with a heat exchanger and a flat heat pipe, achieving fast thermal response speed and excellent surface temperature uniformity. By separating sensible and latent heat transfer, a dehumidification-adjustable cooling method was proposed, effectively decoupling condensation prevention and cooling capacity issues, with forced convection further enhancing cooling performance.
With increasing demand for building energy savings and comfort, radiant cooling systems have received increasing research attention, and novel radiant cooling terminals have been developed in recent years. However, poor surface temperature uniformity and the issue of coupled condensation prevention and cooling capacity remain the two major limitations of radiant cooling terminals. In this study, a novel radiant cooling terminal integrated with a heat exchanger and a flat heat pipe was developed. A novel cooling mode was proposed by using the flat heat pipe for sensible heat transfer only and the heat exchanger for both cooling and dehumidification. Furthermore, forced convection was added to the terminal to further optimize the cooling performance. Heat transfer analysis and thermal performance of the terminal were conducted. The novel terminal has advantages in thermal response speed (360?535 s) and surface temperature uniformity (?2 ?C) due to phase change. The sensible and latent heat transfers were separated. The dehumidification-adjustable cooling method changed the cooling capacity of the terminal from 104.4 to 357.4 W, and the proportion of latent heat transfer varied between 12.1% and 26.4%, with preliminary results showing decoupled condensation prevention and cooling capacity improvement. Furthermore, adding forced convection increased this decoupling, and the surface temperature and cooling capacity simultaneously increased by 4?C-6?C and 75.7%, respectively. Cooling terminal performance improved owing to the dehumidification-adjustable cooling method, which had a referable application value.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available