Re: [TRNSYS-users] Transmission losses

[David Bradley <bradley@tess-inc.com>]

Julie,
  I would recommend looking at some of Type56's energy balance outputs. Your calculation ignores the energy that is being stored in the wall at any given time, which can significantly throw off your energy balance.
Kind regards,
 David


Julien L'Hoest wrote:

Dear all,

I just have a little question about the Transmission losses calculated by type 56, the Q_UA output exactly.

I use a kind of static model of a building to determine boiler/chiller power in winter/summer. Here are the results:

during winter:
T_out = -12
T_in = 21

Transmission losses (Q_UA) = 166 kW

During summer:
T_out = 32
T_in = 26

Transmission losses = -3 kW

I thougt Q_UA should be proportionnal to Delta T and then equal to about -30 kW during summer. Does someone know how the Q_UA output is calculated ? Is there any other output that I could use to make a static energy balance instead of Q_UA ?

Kind regards.

Julie L.

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