The impact of air gaps on the performance of reflective insulations

Lim Chin Haw, Chan Seong Aun

Research output: Contribution to journalArticle

Abstract

Solar heat gain is the primary issue for cooling energy which accounts for the highest energy consumption in building particularly in hot and humid climate like Malaysia. Approximately 93% of the solar heat gain through a roof is by radiation compared to conduction and convection methods. One of the most effective passive strategies to reduce radiative heat transfer through a roof is by using reflective insulation. Generally, reflective insulations are insulation materials that have low emissivity which ranges from 0.03 to 0.04 with high reflectance values. The assembly of a reflective insulation is characterized by an enclosed air gaps adjacent to low-emittance surfaces like aluminum foil. The performance of reflective insulation is commonly evaluated in accordance to ASTM C518 Standard using Heat Flow Meter. The objective of this paper is to analyze the performance of four different types of reflective insulations with various enclosed air gaps namely the big bubble aluminum foil, small bubble foil, woven foil and metalized foil. Based on the measurement and analysis, it was discovered that the big bubble foil with 50mm top air gap and 75mm bottom air gap has the highest R-value of 2.38.

Original languageEnglish
Pages (from-to)28-34
Number of pages7
JournalAlam Cipta
Volume12
Issue numberSpecial Issue 1
Publication statusPublished - 1 Jan 2019

Fingerprint

insulation
heat
air
performance
bubble
roof
aluminum
energy consumption
Malaysia
Values
flowmeter
climate
emissivity
energy
heat flow
heat transfer
reflectance
convection
cooling

Keywords

  • Emissivity
  • R-value
  • Radiation
  • Reflective insulation
  • Solar heat gain

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Urban Studies
  • Nature and Landscape Conservation
  • Management, Monitoring, Policy and Law

Cite this

The impact of air gaps on the performance of reflective insulations. / Haw, Lim Chin; Aun, Chan Seong.

In: Alam Cipta, Vol. 12, No. Special Issue 1, 01.01.2019, p. 28-34.

Research output: Contribution to journalArticle

Haw, LC & Aun, CS 2019, 'The impact of air gaps on the performance of reflective insulations', Alam Cipta, vol. 12, no. Special Issue 1, pp. 28-34.
Haw, Lim Chin ; Aun, Chan Seong. / The impact of air gaps on the performance of reflective insulations. In: Alam Cipta. 2019 ; Vol. 12, No. Special Issue 1. pp. 28-34.
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