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The real answer as to if GSHP’s need back up heat has less to do using the geothermal heating program and considerably much more to do using the heat loss in the structure room by room and the type(s) of distribution. Rooms which have garage door sized windows and 20 foot c eilings have quite high heat loss. We need to have to meet this heat loss by delivering BTU’s at a rate as quickly as they leave the room If the room has radiant floors we will need to determine how a lot of BTU’s we are able to deliver via the floor. This delivery will depend on type of radiant floor (slab, thin slab,http://www.eestiautogaas.ee/freerunmallau.php, staple up, Warmboard and so on), floor coverings, and temperature of heat transfer fluid (120 F max with GSHP)
In summary,http://www.ecolifeprojects.com/coralfreerun.php, a geothermal heat pump might be designed to deliver far more than sufficient BTU’s to match the pe ak load of the project. The challenge is in delivery of that heat energy to exactly where it really is required and for that you will find basically two possibilities. 1 is usually to add a lot more distribution capability that is compatible with low temp 120 F max. The second way would be to boost the temperature of the delivery keeping in mind the other limitations that exist with regard to max temp of floor surfaces.
Supplemental heat refers to a secondary heat source that may assist the operation of a heat pump throughout peak loads. It might be an electric plenum heater on a water to air heat pump or it could possibly be a small boiler or perhaps a water heater tied into a radiant distribution method.
This really is another usually misunderstood topic. Many people insist that all geothermal heat pumps will need back up heat throughout extreme cold.
If we are unable to deliver enough heat through the floor to meet the demand we could think of adding forced air distribution. This forced air distribution could have a fan coil that’s acquiring 120 degree water from the GSHP and this combined using the radiant may satisfy the demand. The other resolution would have been to raise the temp in the heat transfer fluid over 120 F with a conventional energy source but this has it’s own troubles and limitations.
We are restricted to making the floor surface temp no hotter than 85 degrees. Hotter than that can cause troubles using the floor coverings and is uncomfortable to the occupants of the space. Due to this limitation the “problem” just isn’t that the heat pump can only create 120 F it’s that even when it may be hotter we wouldn’t want to send hotter than that to the floor,http://natashamall.com/cheapfreerun2.php. In these circumstances a boiler wouldn’t assist the scenario,http://sipcalifornia.com/dailyfreerun.php. The answer is adding distribution capabilities.
First lets separate back up heat from supplemental heat. Back up heat refers to a way of heating if the GSHP is down and out. It means that there’s a second conventional source of heat that’s there to take over if the geothermal heat pump is entirely out of commission for whatever reason,http://www.digilight.com.au/freerun3womens.php. Now that could seem ridiculous but I can assure you you can find a great deal of custom houses in the rocky mountain west which have each GSHP systems as well as a boiler that is sized to deal with the full load.
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