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RE: [EnergyPlus_Support] Energy associated with replenishment of stock materials
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- Subject: RE: [EnergyPlus_Support] Energy associated with replenishment of stock materials
- From: "Dahlstrom, Aaron" <ADahlstrom@xxxxxxxxxxxx>
- Date: Mon, 2 Apr 2012 15:41:09 -0400
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- Thread-topic: [EnergyPlus_Support] Energy associated with replenishment of stock materials
James ?
While I haven?t yet conducted a supermarket analysis, I have encountered projects where we accounted for the mass flow impact on heating and cooling loads.
In a more memorable case, the heat transfer was intra-zonal, rather than between building and outdoors. I believe the same process could be applied to the inside-outside mass flow, though. In this one, thermal oil heaters in zone 1 consumed natural gas. The hot thermal oil was piped to large baking ovens in zone 2 which radiated a portion of the heat from the thermal oil. The baked product then was conveyed at high temperature into the packaging room (zone 3), where a large portion of the thermal energy was released as the product was cooled. We set this up with a utility load in zone 1, with a low Sensible/Latent HG ratio. Then, zones 2 and 3 had large ?internal energy sources? with Sensible/Latent HG ratios as appropriate. In this case, all the heat gain was positive ? ie heat added to the space. However, I have also specified negative internal loads in spaces where a specific process was removing heat from the space.
So I think we could do what you?re suggesting ? accounting for mass flow thermal effects ? using a structure similar to the above. A caveat ? this was an eQUEST, so the structure might be different if done in energy plus.
But that does beg the question ? how significant is the effect?
I think a back of the envelope calculation ? mass flow x cp x delta T = thermal load ? could give us inputs into a schematic model to check the significance.
Aaron
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