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Dear TRNSYS users, my apologies for delaying so long...
in my year-long simulation type 56 calculates
sensible and latent loads based on the cooling and heating types that I set in
PREBID:
Heating type: room temperature
control = 20°C
heating power = unlimited (radiative part = 0)
desired rel. humidity = 40%
Cooling type: room temperature
control = 26°C
cooling power = unlimited (radiative part = 0)
desired rel. humidity = 60%
Now I want to meet the loads with a type673 fun coil, but I don't understand:
1) how I can control the
equipment. For example: using 2 units type 40 (differential
controller with hysteresis) I can obtain a control signal of 1 for
cooling and heating when the zone temperature (output of type 56) rise above
26°C or drop below 20°C; but the zone temperature was just forced in PREBID to
maintain in this range, so the signal for cooling and heating (input to type
673) is always 0 and the equipment don't works. Alternatively I can use a few of
types 40 based on the loads control; but the outputs of type 56 often contains
in the same timestep positive latent and negative sensible loads (or negative
latent and positive sensible loads), so isn't possible in this timestep to
generate a unique control signal for cooling or heating (i.e. if the zone at the
same time needs of negative sensible and positive latent loads, how can I
decides to cooling or heating?)
2) if the outputs of the
type673 fun coil (sensible and latent load met, load not met) are the end of my
work or if is necessary to link them as inputs of type 56. In PREBID is in fact
possible to define other gains inputs (a part from persons, computer and
artificial lighting) by specifing the radiative and convective powers and the
absolute humidity). In this case the outputs from type673 2 pipe are as inputs
to the parameter of convective heat (sensible heat) and radiation heat
(=0), but I don't know how to connect latent heat and abs
humidity.
Thank you in
advance, Maurizio
Maurizio Sorce
Department of Energy and Environmental Research (DREAM) Università degli Studi di Palermo |