THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

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Temperature correction factor simulation over the heating period

ABSTRACT
New Regulations on energy efficiency in buildings in the Republic of Serbia legislate values for the temperature correction factor used to calculate the heat flux to the outdoor environment through construction elements of a certain type. The temperature correction factor is used to correct errors caused by calculation of heat losses based on the design outdoor and indoor temperature difference of building elements adjacent to unheated spaces which are in direct contact with the ground or external environment. Since the temperature correction factor directly influences the calculation of total heat losses and total annual energy demand, it is recommended that the temperature correction factor be determined on the basis of measured values of outdoor and indoor air temperature, or, on the basis of the values obtained by the simulation. This paper presents the results of measurements in the High School of Design, Textile and Management in Belgrade in order to assess energy efficiency and the energy performance of buildings. Data obtained on the basis of measurements, such as indoor and outdoor temperatures, are used for the calculation of the heat transfer coefficient for the building envelope elements as well as to calculate a temperature correction factor for the unheated attic space of the building. This paper also offers a dynamic simulation of the multi-zones building in the TRNSYS environment. The aim was to compare temperature correction factor values obtained from measured temperature values, with those calculated from standard, taken from the Regulation table and produced by simulation.
KEYWORDS
PAPER SUBMITTED: 2017-05-29
PAPER REVISED: 2017-12-29
PAPER ACCEPTED: 2018-01-22
PUBLISHED ONLINE: 2018-04-28
DOI REFERENCE: https://doi.org/10.2298/TSCI170529121V
REFERENCES
  1. Energy Performance Certification of Buildings-A policy tool to improve energy efficiency, www.iea.org/publications/freepublications/publication/buildings_certification.pdf
  2. Energy Performance of Building Directive, www.designingbuildings.co.uk/wiki/Energy_Performance_of_Buildings_Directive
  3. Energy Performance of Building Directive, www.bre.co.uk/filelibrary/Scotland/Energy_Performance_of_Buildings_Directive_(EPBD).pdf
  4. Energy Efficiency Directive,ec.europa.eu/energy/en/topics/energy-efficiency/energy-efficiency-directive
  5. Building Energy Efficiency Regulation ("Off. Gazette of RS" no. 61/11) (in Serbian)
  6. Regulations on Conditions, Content and Manner of issuing certificates for buildings´ energy performance ("Off. Gazette of RS", no. 61/11) (in Serbian)
  7. ISO 13789:2008 2nd Ed. Thermal performance of buildings —Transmission and ventilation heat transfer coefficients — Calculation method
  8. ISO 13790:2008 2nd Ed. Energy performance of buildings — Calculation of energy use for space heating and cooling
  9. ISO 12381:2009 Heating systems in buildings — Method for calculation of the design heat load
  10. ISO 9869: 1994(E) Thermal insulation - Building elements - In-situ measurement of thermal resistance and thermal transmittance
  11. ISO 13370: 2007 Thermal performance of buildings — Heat transfer via the ground — Calculation methods
  12. Valentina Turanjanin at al., The influence of temperature correction factor to determine the buildings heat losses, International Symposium on Thermal Science and Engineering of Serbia-SIMTERM 2015, Sokobanja, Serbia, 2015, pp 594-600.