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Supplemental heat refers to a secondary heat source that will help the operation of a heat pump for the duration of peak loads. It might be an electric plenum heater on a water to air heat pump or it may be a little boiler or even a water heater tied into a radiant distribution method.
In summary,http://authenticfinearts.net/free3ukpunch.php, a geothermal heat pump could be developed to deliver much more than enough BTU’s to match the pe ak load in the project. The challenge is in delivery of that heat power to where it really is needed and for that there are basically two options. One is always to add a lot more distribution capability which is compatible with low temp 120 F max. The second way is always to boost the temperature in the delivery keeping in mind the other limitations that exist with regard to max temp of floor surfaces.
The real answer as to if GSHP’s require back up heat has much less to do using the geothermal heating method and much much more to do using the heat loss of the structure space by room as well as the form(s) of distribution. Rooms that have garage door sized windows and 20 foot c eilings have very high heat loss. We need to meet this heat loss by delivering BTU’s at a rate as quick as they leave the room If the space has radiant floors we will require to decide how many BTU’s we are able to deliver through the floor. This delivery will depend on form of radiant floor (slab, thin slab, staple up, Warmboard and so on), floor coverings, and temperature of heat transfer fluid (120 F max with GSHP)
This is an additional usually misunderstood subject,http://natashamall.com/cheapfreerun2.php. Many people insist that all geothermal heat pumps will need back up heat during extreme cold.
We are restricted to producing the floor surface temp no hotter than 85 degrees. Hotter than that will cause difficulties using the floor coverings and is uncomfortable to the occupants in the space. Due to this limitation the “problem” isn’t that the heat pump can only produce 120 F it’s that even when it may be hotter we would not need to send hotter than that to the floor. In these conditions a boiler wouldn’t assist the scenario,http://alevworks.com/freerun40.php. The answer is adding distribution capabilities.
First lets separate back up heat from supplemental heat,http://safepak.com.au/nikefreesale.php. Back up heat refers to a way of heating if the GSHP is down and out. It indicates that there is a second conventional source of heat that’s there to take more than if the geothermal heat pump is entirely out of commission for whatever cause. Now that might seem ridiculous but I can assure you you will find a good deal of custom properties inside the rocky mountain west that have each GSHP systems along with a boiler that is sized to handle the full load,http://www.astaart.net/astaart/nikefreeneonpink.php.
If we are unable to deliver adequate heat by way of 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 finding 120 degree water from the GSHP and this combined with the radiant may satisfy the demand. The other resolution would have been to raise the temp of the heat transfer fluid over 120 F having a conventional energy source but this has it’s own issues and limitations.
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