Abstract
The transfer of surface heat between a building and the outdoor environment is the energy transfer channel and it is important for the energy efficiency of buildings. Early stage building design is a critical stage and it can directly determine the energy consumption by a building. Therefore, selecting appropriate surface heat transfer coefficients (SHTCs) is a key issue in building energy consumption prediction. In this study, EnergyPlus was employed to investigate the building load in Chinese cities with different SHTCs: (1) constant SHTCs based on national standards; and (2) dynamically changing SHTCs based on the Thermal Analysis Research Program (TARP). Based on investigations of the hourly load, daily cumulative load in a typical day, and annual cumulative load with different SHTCs, corrections for the annual cumulative load were obtained according to the relative deviations between the results produced with the TARP model and traditional SHTCs. The greatest relative deviations were 67.5% and 25.3% for the building shape factor φ = 0.49 and 0.29 in Lhasa. The relative deviations were 13.3% and 12.0% for φ = 0.49 in Xi’an and Beijing, respectively. Corrections were not essential for other conditions because the relative deviations were lower than 5.0%. Considering the current characteristics of engineering calculations and the need to obtain more accurate design results, dynamically changing SHTCs should be applied. These correction factors can obtain more accurate results for the current building energy efficiency system with traditional SHTCs.
Highlights
The building sector accounted for more than 35% of the total energy consumed inChina during 2020 [1]
The annual energy consumption is based on the annual cumulative load of the annual energy consumption is based on the annual cumulative load of heating, ventilation, and air conditioning (HVAC) systems, so the assessment results heating, ventilation, and air conditioning (HVAC) systems, so the assessment results determined according to the annual energy consumption and building load for an actual determined according to the annual energy consumption and building load for an actual building model and reference building model should be consistent for a HVAC system building model and reference building model should be consistent for a HVAC system with the same efficiency
This study investigated the building hourly load behavior on a typical day, daily cumulative load behavior, and corrections of the annual cumulative load for different
Summary
The building sector accounted for more than 35% of the total energy consumed inChina during 2020 [1]. The building sector accounted for more than 35% of the total energy consumed in. Urban heat islands and high-density cities exacerbate this issue [2,3]. Corresponding standards have been developed to control the energy consumption and guide actual engineering applications, and the following two methods are generally applied in building energy efficiency design [4]. Method 1 involves setting limiting values for the thermal performance of a building (such as the heat transfer coefficient, window–wall ratio, and shape coefficient). Method 2 involves setting a limiting energy demand for a building (known as the trade-off option). Numerical simulations, and theoretical analyses can be conducted to explore the relationships between the thermal performance of specific building components and the energy demand of a whole building
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
