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Frequently Asked Questions...

how to control temperature in large building full of many rooms?

i have huge air handlers upstairs in my building, they can blow hot air or chilled air, but I need a way to close off the air or open up the air to any room as needed either manually or by thermostat control.


Best Answer...

Answer:

What I think the current situation is. One bank of air handlers feeding air into a single duct. This duct then snakes around the building, and has "T" fittings" which then pipes air a short distance away from the main distribution duct into each room. You mention a lack of a means to shut air flow off to individual room. The air pressures involved are likely low enough that a movable louvre/shutter could be used to stop air flowing from the pipe into the room.

These louvres could be thermostatically opened/shut, but you really need a way of sending a signal back to the air handler to give it an idea of the amount of air needed. Consider running two loops of wire beside the duct (could have wires for electrical power for the thermostat/times clocks too), and if there is a demand for hot air/a louvre is opened, then a set amount of electric CURRENT is ADDED to a "hot loop". The flow of current through the hot loop can then be measured (at any point!), and gives an indication of demand for hot air. Do the same for cold demands using the "cold loop".

That's got general flow management sorted, but there's still a issue regarding potentially conflicting demands for heating/cooling. I think this could only be met by physically separating the delivery of hot/cold air. Two banks of air handlers controlled individually, and air from each bank is sent via a dedicated pipe (just don't mix the air from heater/coolers BEFORE the pipes)

You've then got two separate/independent systems for which the air temperature can be independently controlled. If you don't need to heat and cool different rooms at the same time then both air handlers can be set to output air of the same temperature, and share the load. Two fairly independent system, also provides a measure of redundancy, meaning that if one bank needs repair, you can still have some heating OR cooling (but not both).

NB make sure each bank has enough capacity to deal with the heating/cooling requirements. The split doesn't haven't to be 50/50 if say there is only one room that needs cooling, and the rest need heated. Remember demands might change with the seasons.

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