dear All,

i am working on a mixed used project in which the domestic water heater and the heating and being fed from a single loop which is hot water loop.

the boiler is feeding several storage tanks and in the appartments there is a decoupler on which two pumps are installed one for space heating (baseboard) and another one for the DWh return.

i tried  HAP 4.5 and Equest 3.64 and i didn t find how to add a boiler to DWH as:

  1- in equest the electrical water heaters are only gas or electrical type .after searhing the help i found that i can let the air system being fed from the DWH loop but still i couldn t connect this loop to a boiler.

 2- in HAP i can only model the domestic water heating by providing a schedule on the LOAD and no boiler is attached.

as per LEED requirement for the modeling of DWH system(ASHRAE 90.1-2007 appendix G paragraph G.3.1.11 it is clearly mentioned that the source of energy for the DWH system in teh baseline should be the same as the proposed system.

can anybody tell me how to model this combined heating system for LEED.

regards,

maher