A Comparative Study between Jordanian Overall Heat Transfer Coefficient (U-Value) and International Building Codes, With Thermal Bridges Effect Investigation

  • Ammar Alkhalidi Energy Engineering Department, German Jordanian University, Jordan
  • Suhil Kiwan Mechanical Engineering Department, Jordan University of Science and Technology, Jordan
  • Haya Hamasha Energy Engineering Department, German Jordanian University, Jordan
Keywords: building envelope, energy efficiency, Jordanian and international building code, heating degree-day, heating and cooling loads


Depletion of fossil fuel and the environmental effect associated with the use of it have made the topic of “thermal insulation regulations” a major concern in country Jordan and worldwide. This paper reviews the overall heat transfer coefficient U-value in Jordanian code for the building envelope, which represents how much the building envelope transfer heat to the outside environment. U-value was reviewed with respect to the following factors, heating degree days, the heating load required to achieve thermal comfort. Based on the review a new U-value of 0.65 W/m2.K was proposed and it was found that this value reduces the energy demand almost 50%. Moreover, the thermal bridge effect was investigated and it was found that an obvious increase in the U-value is present when having thermal bridges; this will affect the energy demand, almost 200%.


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