[TRNSYS-users] conventional heating radiators TNSYS 16

[marcello.caciolo at aximaseitha-gdfsuez.com]

Dear Eva,

We use to model radiators indirectly, by imposing in type 56 a heating type, with a radiative part of 0.3 and a set point temperature corresponding to the radiator set point temperature + 1°C, in order to take into account the regulation of the radiator (thermostatic valve). It is a very rough approach, but we find it sufficient for most applications and enough easy to implement.

A more rigorous approach would be to characterize the radiator by a law of the type: Q = kDT^n, with k and n characteristic  of the radiator, and to associate a PI controller with no integral (proportional controller). The problem of this approach is that it is necessary to know the proportional constant of the thermostatic valve and to use little time steps. In addition, this approach does not consider the delay of action of the thermostatic valve, which can be important, and its hysteresis. More complex approaches can be imagined to take into account these factors, but you should to know exactly all the characteristics of your thermostatic valve.

For this reason, we usually use the simplified approach I proposed.

Best regards,

Marcello Caciolo
Responsable Outils et Méthodes d'Analyse Energétique
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De : trnsys-users-bounces at cae.wisc.edu [mailto:trnsys-users-bounces at cae.wisc.edu] De la part de Eva gklezakou
Envoyé : vendredi 29 juin 2012 13:12
À : trnsys-users
Objet : [TRNSYS-users] conventional heating radiators TNSYS 16

Dear Sirs,

I am informed that there is not a free component which can be used in order to model conventional heating radiators (warm water based not electric). Does anyone has any component which can model this case. Does anyone know any other approach in order to model this type of heating system?
Thank you.

Regards,
Ev



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