10.4122/1.1000000839
Sakulpipatsin, Poppong
Poppong
Sakulpipatsin
p.sakulpipatsin@bk.tudelft.nl
Sakulpipatsin, Poppong
Poppong
Sakulpipatsin
p.sakulpipatsin@bk.tudelft.nl
Building-envelope parametric study of thermal energy and thermal exergy values in an office building in a cold climate
8th Symposium on Building Physics in the Nordic Countries
2008
2008
The exergy concept is useful to pinpoint magnitudes and locations of thermal imperfection occurring through an energy supply chain, and ultimately to reduce primary energy input to the energy supply chain.
This work is to investigate the effects of changing values of some building-envelope parameters to thermal exergy values in a simulated office building. The building-envelope parameters considered are the wall thicknesses, the floor thicknesses, the insulation thicknesses in the walls, the window types and the window sizes. The building to be studied in this work is chosen as a cubic box in order to eliminate the effects in building geometry and orientation. The building operation plans and the occupancy requirements are given according to those in a typical office building in the Netherlands. The building is simulated by using the building simulation tool TRNSYS and the TMY2 weather data of a cold climate in De Bilt, the Netherlands. The study is carried out for the 274th hour (when the calculated hourly thermal energy demand for heating the building is the highest one) and the 4096th hour (when the calculated hourly thermal energy demand for cooling the building is the highest one) of the Typical Meteorological Year. The thermal exergies investigated are the thermal exergy supplied by heating (or cooling) equipments, the thermal exergy gains from infiltration and ventilation, the thermal exergy gain by thermal transmission between the inner surface nodes and environment via the walls, the (convective and radiative) internal thermal exergy gain from occupants and appliances and the solar exergy gains absorbed on the inner surfaces of the building envelope, as well as the thermal exergy accumulated in the building envelope.
Investigation of the effects of the same parametric changes to thermal energy values in the building are also carried out in this work. The results of the thermal energies and the thermal exergies are compared and discussed to what discrepancy between thermal energy analysis and thermal exergy analysis of the building occurs.