Next Article in Journal
Solar e-Cooking: A Proposition for Solar Home System Integrated Clean Cooking
Next Article in Special Issue
How Reliable Are Standard Thermal Response Tests? An Assessment Based on Long-Term Thermal Response Tests Under Different Operational Conditions
Previous Article in Journal
A Systematic Multivariate Analysis of Carica papaya Biodiesel Blends and Their Interactive Effect on Performance
Open AccessArticle

Experimental Evaluation of Radiant Heating Ceiling Systems Based on Thermal Comfort Criteria

Building Science Group (fbta), Institute for Building Design and Technology, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
*
Author to whom correspondence should be addressed.
Energies 2018, 11(11), 2932; https://doi.org/10.3390/en11112932
Received: 14 September 2018 / Revised: 4 October 2018 / Accepted: 23 October 2018 / Published: 26 October 2018
(This article belongs to the Special Issue Sustainable Use of Energy in Buildings)
  |  
PDF [2857 KB, uploaded 27 October 2018]
  |  

Abstract

Low-temperature radiant heating systems can be considered as suitable candidates for the refurbishment of old heating systems. These systems are proven to save energy, however, their drawback is their impact on the creation of radiant temperature asymmetry and local thermal discomfort, especially in old buildings where the temperatures of surfaces (for example external walls with a low level of insulation and large windows) are low. This study aims to evaluate the potential application of low-temperature radiant ceiling heating systems (28–38 °C) in old and energy-renovated buildings, based on subjective experiments and thermal comfort criteria such as thermal sensation, comfort, satisfaction, and sensation asymmetry votes. Later, in the Discussion section, the guideline for the radiant temperature asymmetry for the warm ceiling presented in ASHRAE Standard-55 is corrected for relatively low air temperatures and different surface temperatures corresponding to “about neutral” conditions for winter clothing. Findings of this research show that the radiant ceiling heating system operating at low temperatures (33–38 °C) can provide fairly neutral thermal sensation and satisfactory comfort at the majority of body-parts, if the building envelope satisfies advanced building energy-efficiency regulations. Additionally, the experimental analyses imply that limitation of 5% suggested by ASHRAE-55 for the percentage of dissatisfied occupants feeling uncomfortable due to overhead radiation can be elevated to 10%. View Full-Text
Keywords: radiant heating ceiling; radiant temperature asymmetry; thermal dissatisfaction; thermal comfort; subjective experiments radiant heating ceiling; radiant temperature asymmetry; thermal dissatisfaction; thermal comfort; subjective experiments
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Safizadeh, M.R.; Schweiker, M.; Wagner, A. Experimental Evaluation of Radiant Heating Ceiling Systems Based on Thermal Comfort Criteria. Energies 2018, 11, 2932.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top