Abstract
The paper presents a simplified conceptual model for energy demand calculations based on building envelope characteristics, thermal mass and local climate. It is based on a network model and lumped analysis of the dynamic process. Characteristic parameters for the buildings are suggested; Driving temperature (DT), Driving temperature difference, (DTD), External Load Temperature (ELT), and Thermal Load Resistance (TLR). The Building Envelope Performance (BEP0), based on a controlled constant indoor temperature is introduced. Solution techniques using stable explicit forward differences based on analytical solutions are derived. The conceptual model has been used for mapping the Driving temperature difference and introduced two performance factors α and β. The first factor represents the effect of thermal comfort interval and thermal mass on the energy demand. The latter represents the ratio between cooling and heating energy demand. These three parameters and factors have been visualized on U.S. maps and enable a possibility to communicate the demand of energy, and cooling and the coupling to building characteristics, in a concise way.
Highlights
Introduction and backgroundThe energy balance of buildings has been studied intensely for many decades using both analytical and numerical tools
Using methods presented in previous work
A simplified model for the energy balance of a building, the Con ceptual model, is developed, tested, and demonstrated. It is based on a network model and lumped analysis of the dynamic process
Summary
The energy balance of buildings has been studied intensely for many decades using both analytical and numerical tools. In studying the effect of thermal mass on the performance of the building’s energy demands, field mea surements showed that similar internal conditions could be obtained for walls with significantly different steady state R-values. This led to the development of an approach to quantify or capture all the effects or properties of the wall including the effect of climate in one value defined as the dynamic temperature response or T value. While keeping a building unconditioned, the outdoor climate induced fluctuation in interior temperature is evaluated to find the overall energy demand Such an approach allows the study of the thermal performance of temperaturecontrolled buildings independently of the exact use of the building. The result of this paper is presented using DOE prototype buildings [28] and generated maps representing U.S climates in order to visualize the importance of the building envelope design, thermal comfort inter val, and thermal mass of commercial buildings
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.
