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[EnergyPlus_Support] Internal Mass
- To: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Subject: [EnergyPlus_Support] Internal Mass
- From: "neal_kruis" <neal.kruis@xxxxxxxx>
- Date: Thu, 04 Jun 2009 20:31:54 -0000
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- Delivery-date: Thu, 04 Jun 2009 14:32:28 -0600
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Dear user group,
When entering internal mass, such as a partition wall, how does EnergyPlus calculate the total heat capacitance? Since the area input for thermal mass represents the total surface area and not the cross-sectional area of the wall, it seems that the heat capacity should be:
(A_s/2)*SUM(C_p,i*rho_i*x_i)
where,
- A_s is the surface area of the mass (which for the wall would be 2x the cross-sectional area)
- C_p,i is the specific heat of the ith layer of the construction
- rho_i is the density of the ith layer of the construction
- x_i is the thickness of the ith layer of the construction
Is this correct? or do I need to use half the thickness of each layer to get the same volume?
Thanks,
Neal
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