The only way is to install a pre-heater coil (something like the littleinch's suggestion) that will prehat the air above freezing point and melt the snow.
Three expansion vessels... Jesus... There's your issue right there.
Probably no cavitation because your static pressure is high enough and the pressure losses ere really small
Noted on the cavitation, I keep that in mind. In my experience it's usually more the issue of expansion vessel placement.
Starving the other circuits shouldn't be an issue due to pump control via differential pressure sensors
Thanks to both of ye guys ;)
Alistar,
So your UHF is running at 35C and HP supplies 50C?
Is the mixer unit a unit with the three port valve AND a mixing pump? Do you have a pic or schematic of that unit?
Is your UHF circuit constant volume circuit? Do you have three port valves at the UFH manifolds or any other way of...
PLC (DDC is used in building services) or any kind of control cannot rectify improper selection of a control valve or wrong hydronic setup. This issue boils down to valve characteristic and assuring the valve operates throughout it's full stem range.
Not sure about the dead band, I believe it's...
The mixing circuit will operate at 35/30C
33% from 45C primary supply vs 66% from 30C secondary return
Heat consumption in the secondary circuit is not the issue, my primary concern is suitability of a simple mixing circuit for the circuit that operates at lower temp from the primary circuit. I...
smaili1, you need to select larger FCUs. These will have airflows at lower fan speeds equivalent to smaller FCUs at high speed, but lesser the noise level.
If possible, consider pre-cooled air supply to the rooms via the AHU. this will reduce FCU sizes and noise issue
Hi everyone,
I would like someone's opinion on the secondary hydronic circuit approach that I have chosen for my design.
I have a heating system with a heat pump that serves as a heat generator (primary side) and it's decoupled from the secondary side by a buffer vessel. There are 4 secondary...
