The link below contains the total energy costs and KWH to operate a 10 ton geothermal system (geo-exchange) in Stillwater Minnesota.
The house:
5000 square foot of the story and one half home is finished (above grade). It is heated to 70 degrees in the heating season and cooled to 76 degrees in the summer.
1200 square foot three car garage that is heated to 62 degrees in the heating season.
2400 square foot unfinished basement using in-floor heating. It is heated to 70 degrees in the winter and cooled to 76 degrees in the summer.
1700 square feet of floor warming. The floors of the master bath, mud room, laundry room and bonus space over the garage (recreation room /pub). these spaces are included in the5000 square foot finished area.
The geothermal system consists of :
1- 5 Ton water to air "Geocomfort" geothermal heat pump with a desuperheater. It has an average coefficient of performance (COP) rating of 4.45. For example a toaster has a COP rating of 1. You put $1 worth of electricity into a toaster you will get $1 of heat out. So ,with the COP of a 92% efficient furnace, you will get 92 cents worth of heat out of it. With a heat pump with an average COP of 4.45, you will get $4.45 worth of heat for that same $1.00. This heat pump /air handler combination heats and cools the air in the home through a sheet metal duct work system. All duct work is sealed.
1- 50 gallon indirect water heating tank. The indirect water heating tank is used to preheat 58 degree well water to 110 degrees by using the desuperheater that is installed on the water to air heat pump.The domestic well water fills the 50 gallon indirect water heating tank as domestic hot water is taken from the water heater down line. Thus, the water heater is filled with the preheated 110 degree water and is bumped up to 130 degrees by the water heater.
1- "Marathon 110 gallon water heater. This water heater has the highest "Energy star" rating for all water heaters of it's size. It is a plastic lined tank that is very well insulated with foam insulation.
1- 5 Ton water to water "Geo comfort" geothermal heat pump that has an average COP rating of 3.3. The heated water produced is used to provide in- floor heat the floors of the garage, master bath, mud room and the recreation room/pub that is built in the "bonus" space over the garage.
1-50 gallon buffer tank heat and store the anti-freeze and water solution that is used by the in-floor heat system.
1- 10 ton vertical loop field. A vertical loop system was used for this house since the soil 8' below the finished grade is a mix of sand and gravel.
click on link www.bmichels-const.com/geothermalblog.pdf
I hope you find this information useful!
Thank,
Builderbob
http://www.bmichels-const.com/
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