.Buildings.Fluid.CHPs.OrganicRankine.Validation.VariableSource

Information

This model demonstrates how the ORC model reacts to variable flow rate and temperature of the incoming hot fluid carrying waste heat. Normally, the working fluid flow rate of the cycle ṁ_w is found from the set point for the evaporator pinch point temperature differential ΔT_pin,eva. This constraint is relaxed under any of the following two conditions:

• If the hot fluid flow rate or temperature is too high, i.e. it carries more heat than the cycle can process, ṁ_w would exceed its upper limit. The flow rate ṁ_w is then fixed at its upper limit and ΔT_pin,eva is allowed higher than its set point.
• If the hot fluid flow rate or temperature is too low, i.e. it carries to little heat, ṁ_w would be lower than a threshold. The flow rate ṁ_w is then set to zero. This effectively shuts down the cycle and the set point of ΔT_pin,eva is ignored.

Contents

Name	Description
MediumHot	Evaporator hot fluid
MediumCol	Condenser cold fluid

Revisions

• January 26, 2024, by Hongxiang Fu:
  First implementation. This is for #3433.