Radiant heating is increasingly used and the interest in these systems is still increasing because of their low initial cost and capability in providing ideal comfort conditions coupled with low energy consumptions. In this system, thermal radiation covers more than 50% of the total heat exchanged and it becomes important to study in which way the position and the size of the radiant heater within a room influences the indoor comfort. By using conventional dynamic simulation codes in which the room energy balance is solved with a simplified approach, detailed information about the optimal position and geometry of the radiant heaters cannot be obtained. In fact, for the optimization of radiant heating systems it becomes mandatory to introduce a more detailed approach for the analysis of the heat transferred by radiation among the different surfaces in which radiation physics is correctly reproduced and this is out of the scope of the commercial dynamic software. In this work a model for the prediction of the radiant heat flux among the surfaces of a room having different temperatures is described. The radiation exchange was modelled by means of the net radiation approach. The calculation of the view factors among the surfaces is obtained by using Matlab. In the paper the effects obtained by adopting different sizes and positions of radiant and convective heaters in a room on the indoor comfort parameters are analyzed. In addition, it is shown in which way different envelopes with different thermal insulation levels can influence the distribution of the operative temperature in the room, the local comfort and the energy demand.

NUMERICAL EVALUATION OF THE INFLUENCE OF SIZE AND POSITION OF RADIANT AND CONVECTIVE HEAT EMISSION SYSTEM ON THE MAIN INDOOR COMFORT PARAMETERS

MARA MAGNI;JEAN PIERRE CAMPANA;GIAN LUCA MORINI
2017

Abstract

Radiant heating is increasingly used and the interest in these systems is still increasing because of their low initial cost and capability in providing ideal comfort conditions coupled with low energy consumptions. In this system, thermal radiation covers more than 50% of the total heat exchanged and it becomes important to study in which way the position and the size of the radiant heater within a room influences the indoor comfort. By using conventional dynamic simulation codes in which the room energy balance is solved with a simplified approach, detailed information about the optimal position and geometry of the radiant heaters cannot be obtained. In fact, for the optimization of radiant heating systems it becomes mandatory to introduce a more detailed approach for the analysis of the heat transferred by radiation among the different surfaces in which radiation physics is correctly reproduced and this is out of the scope of the commercial dynamic software. In this work a model for the prediction of the radiant heat flux among the surfaces of a room having different temperatures is described. The radiation exchange was modelled by means of the net radiation approach. The calculation of the view factors among the surfaces is obtained by using Matlab. In the paper the effects obtained by adopting different sizes and positions of radiant and convective heaters in a room on the indoor comfort parameters are analyzed. In addition, it is shown in which way different envelopes with different thermal insulation levels can influence the distribution of the operative temperature in the room, the local comfort and the energy demand.
Proceedings of 16th International Conference on Sustainable Energy Technologies (SET 2017)
1
10
Mara, Magni; JEAN PIERRE CAMPANA, ; Fabian, Ochs; GIAN LUCA MORINI,
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/618834
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact