Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
EnergyPlus PlantLoop object has input field Common Pipe Simulation which specifies a primary secondary configuration. Though this field eliminates the need of specifying two different EnergyPlus loops each
for Primary and Secondary half loops, it is not a recommended approach and in the future the common pipe is expected to be obsolete. A recommended approach for primary/secondary pumping arrangement is using a heat exchanger and two separate loops . Refer to Plant Application Guide Chapter 8, Example System 3: Primary/Secondary Pumping for more details. A pump is quite simply the component that drives the flow in plant and condenser loops. It doesn't connect the two loops. The thread (and E+ example file mentioned there) also have pumps in supply side inlet of both the loops.
