Hi All,

I'm working on a system where a geothermal loop and a cooling tower both
supply cooling to a WSHP loop. I am trying to control the loop so that
cooling load goes first to the geothermal loop and second to the cooling
tower as the ground loop will not be sufficient to provide cooling
year-round.

I have run up against some funny things.

1. If I let the program auto-size the cooling tower and use it's default
control, I get a negative number for heat rejection energy (the cooling
tower is given a capacity of -10 MBTU/hr with fan energy listed at -41 kw)

2. If I size the cooling tower according to design at 4.2 MBTU/hr, the
entire program shuts down

3. If I try to run the model without the cooling tower, the entire program
shuts down

Any thoughts?

Thank You,

--
Karen