[EnergyPlus_Support] Re: Hot water air heaters

["FrancescoP" <direzionecontraria@xxxxxxxx>]

The temperature of the air exiting from the coil can be calculated considering that
Q = m_air * c_air * (T_air,out - T_air)
The air temperature T_air,out obtained from the previous equation has to be equal to the temperature of the air exiting from the coil calculated by equation of p. 563 of Engineering Reference
T_air,out = T_air,in + eps * C_min * (T_w,in - T_air,in) / C_air
Therefore I can calculate eps, from which I can calculate NTU and, later, UA.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, direzionecontraria <direzionecontraria@...> wrote:
>
> Hot water air heaters 
> Hello. I have to model hot water air
> heaters for an industrial building. They are used both for heateing
> during the winter season and for cooling during the summer season. I
> know for a certain air velocity (0,0011m^3/h) and for a certain inlet
> temperature (85°C) and a certain air temperature (20°C) the heat
> flux (35300W) which the hot water air heater transfers to the air. In
> DesignBuilder I created â??fan coil unitsâ?? (in E+ FourPipeFanCoil)
> but now I want to develop the model with precision in EnergyPlus.
> What is the best way? At the moment I'm reading what
> EngineeringReference says about the equations regarding fan coil units.
> Best Regards
> Francesco Passerini
>



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