I'm trying to model a domestic hot water system that is fed by a
water-water heat pump attached to a ground loop heat exchanger loop
(it's a secondary loop off a GSHP loop). I figure the way to do it is
the loop-loop heat pump chiller option. The DOE2 documentation shows the
diagram below for heating only.

Has anyone modeled this successfully? If so, how do you get rid of the
chilled water loop? I would like to assign all of the heat loss to the
ground loop instead of a chilled water loop.

Vikram Sami, LEED AP