Hello,
i am looking for a way to properly model water "Walls" or Barrels. I have a passive greenhouse i am looking to add a few dozen water filled steel drums to assist with my supplemental night time heating requirements for the space. Has anyone been successful in modeling such a system.
Thanks,
J
Water barrels in a Passive Greenhouse
Re: Water barrels in a Passive Greenhouse
I’d probably account for the thermal mass by using the furniture mass factor.
Air Mass and Furniture Modelling
The dynamics of heat storage in the room air masses is described by Equation 4, in which Ta is the bulk air temperature of the room (in the stirred tank representation) and V is the room volume.
At the user’s option, the effect of heat storage in the furniture may be incorporated into the analysis. A facility is offered for modelling furniture on the assumption that its temperature closely follows that of the air. Under this assumption its effect is to increase the effective thermal mass of the air by a
factor termed the furniture mass factor (ff). In this case, equation 4 becomes
If furniture is to be ignored, ff should be set to 0. In cases where the furniture has substantial thermal capacity, it is best to model it by introducing additional internal walls, with suitable thermal properties, into the room model.
Air Mass and Furniture Modelling
The dynamics of heat storage in the room air masses is described by Equation 4, in which Ta is the bulk air temperature of the room (in the stirred tank representation) and V is the room volume.
At the user’s option, the effect of heat storage in the furniture may be incorporated into the analysis. A facility is offered for modelling furniture on the assumption that its temperature closely follows that of the air. Under this assumption its effect is to increase the effective thermal mass of the air by a
factor termed the furniture mass factor (ff). In this case, equation 4 becomes
If furniture is to be ignored, ff should be set to 0. In cases where the furniture has substantial thermal capacity, it is best to model it by introducing additional internal walls, with suitable thermal properties, into the room model.