Hello group,
I am wondering if anyone has had experience with a switchover system before. Mainly switching from heating to cooling or vice versa based on a specific outdoor air temperature.
Bill,
Thank you for your email. i guess I should've explained a bit better. So the system is not two pipe, there is a CHW and HW loop. However at the zonal level (unit ventilator at some zone and VAV with active chilled beams at others) the system is switchover. The cooling is done through a ASHP and same ASHP does heating too as well as boiler back up.
I do have the SNAP on with the outdoor air set temperature for both cooling and heating loops. The heating does seem to stop in summer (above the SNAP temp). However the cooling appears to be year round!
Omid,
You can create a two-pipe loop and have it alternate between heating and cooling mode using SNAP or SCHEDULED for LOOP-OPERATION.
Regards,
Bill
[Senior Energy Engineer 28Jun2012]
Bill,
Thank you for your email. i guess I should've explained a bit better. So the system is not two pipe, there is a CHW and HW loop. However at the zonal level (unit ventilator at some zone and VAV with active chilled beams at others) the system is switchover. The cooling is done through a ASHP and same ASHP does heating too as well as boiler back up.
I do have the SNAP on with the outdoor air set temperature for both cooling and heating loops. The heating does seem to stop in summer (above the SNAP temp). However the cooling appears to be year round!
Regards,
Omid Manouchehri
LEED AP BD+C