How hot does the water need to be?
The Multi-Stack chiller guys in my area are beating the bushes like crazy touting the benefits of the energy recovery chillers, and pitch them as first stage heat in a situation where you can ground couple them. I think that the LWT on them is limited to...
Everyone makes good points. It's hard to decide how I would approach it without knowing the criticality of it. But, essentially .05" is a pretty common number for positive pressurization. As HEC says, it can probably be accomplished thru balancing the supply and return. You mention that the...
I think you're asking about a water source heat pump? or reverse cycle chiller? Trane has them, as does Milti-Stack. Those are two options that I am aware of.
Jabba
Convention, as I have been taught, is to locate a pump before a chiller, after a boiler or cooling tower. I think it has to do with trying to get a warmest/lowest pressure spot in the hydronic system for deaeration. The dissolved gasses in the water will come out of solution at the warmest...
If this is YOUR house... or someone close... or a high end user, don't neglect considering a variable speed model. This could give the Owner the best of both worlds... enough capacity to keep the home at set point on the hottest days, and the ability to turn down, and have long run cycles for...
I second the VFD approach. It's how I would come at it.
Write your control sequence so that the fan is at high speed at... 90 or 95F in the room, and at minumum speed at say... 65F, and OFF at 55F. Something like that. You fill in the temp points on the curve that you want.
Remember that...
Reheat does not dehumidify.
That is my biggest pet-peeve of misconception of HVAC people.
Reheat does not dehumidify. It removes NO moisture. It does reduce the RH of the supply air, but the ONLY thing that removes moisture is a cold coil. The reheat allows the cooling coil to run and...
TTsquared, that's a great idea too... unfortunately, it would require a lot of additional plumbing to keep the thermally altered water separate from the unaltered water.
Not appropriate for THIS project.
Newest development... there is a lot of ground water at the site. It's still a little...
This thing sounds like it had 3 primaries plus the zone loops?
Most gas fired non condensing boilers will handle down to 140F return water temp. Oil fired is higher. The system sounds like a Joe Bob abortion to me. I'm sure it works... but it sounds like it has a lot of unnecessary...
