Hot water re-heat coil & baseboard convector sequence of operation
Hot water re-heat coil & baseboard convector sequence of operation
(OP)
Hi Guys, I have an application where the main air handling unit (constant volume) is providing slightly cool air (65 deg F) to both interior and exterior zones. Each zone has its own re-heat coil. The exterior zones also have a baseboard convector heater. I am unsure of the best way to sequence the re-heat coil and baseboard. The re-heat coils will be sized for a delta T of 20deg F. No air conditioning is required for this building. Any suggestions? Thanks.





RE: Hot water re-heat coil & baseboard convector sequence of operation
RE: Hot water re-heat coil & baseboard convector sequence of operation
RE: Hot water re-heat coil & baseboard convector sequence of operation
i am not sure what do you plan. reheat coils are used for cooling season, while baseboard heaters are used for heating season.
you neither use reheat coils for space heating nor you use baseboard heaters for reheating, that's for sure. so there is no control sequence between them at all.
RE: Hot water re-heat coil & baseboard convector sequence of operation
RE: Hot water re-heat coil & baseboard convector sequence of operation
RE: Hot water re-heat coil & baseboard convector sequence of operation
knowledge is power
RE: Hot water re-heat coil & baseboard convector sequence of operation
what confused me, over my low attention, is the concept of "slightly cool" air. there must be some reasonable explanation of it. normally, if temperature-neutral air would be sent to spaces on heating season, that should be "slightly warm" air, few degrees to cope with thermostat range and small inaccuracies, a common practice, a specifying exact design temperature for supply air could easily lead to slight subheating.
slightly cool air could mean that interior spaces likely need no heating in winter but some level of heat rejection.
anyhow, i would stay with chas, baseboards heater should have precedence in perimeter zones most of time, though "slightly cool" supply air concept did not point in that direction.
RE: Hot water re-heat coil & baseboard convector sequence of operation
the perimeter hot water can be controlled by using a Water Temperature Setback control, controlled by outside air temps for example- 0* OA = 180* water to 50* OA = 110* water. boilers shut down at 55* OA or interior space temp. all depends on the control you have.
I bet this building has 4 zone for the perimeter and no real individual zone control for office's, they may have dampers on the baseboard or a danfoss valve at the beginning, if your lucky.
there are a few was to do this. need more info