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Re: geothermal heating/radiant flooring/domestic hot water

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Posted by Robert Gammon on Thursday, 1 May 2008, at 10:41 a.m.,
in response to Re: geothermal heating/radiant flooring/domestic hot water, posted by Brad

EW series heat pumps will heat large areas of floor, especially if the area is well insulated. The same EW heat pump can produce nearly unlimited hot water. Keep in mind that the flow rate on the LOAD side of the heat pump is 3GPM per ton of capacity. 3T = 9GPM or 540GPH!!

When the heat pump starts, with 30 seconds or so, the outlet temp rises to 10F to 15F degrees warmer than input temp from the DHW tank. The rush of warm water raises the temp of the water in the tank which then raises the output temp from the heat pump. This continues until a thermostat (aka aquastat) tells the heat pump that the DHW tank has hit the required temperature.

If you read enough of what Phil has on his web site, you will see that he was going to attempt to cool the house with a evaporative cooler. His HVAC contractor talked him out of that and he has a separate W-A heat pump that is used mostly for cooling, but also supplements the w-w heat pump for heating some of the time.

In most areas of the USA, you will likely want to have a separate heat pump to provide cooling. Chilling the floor IS an option, but would likely require wearing socks as a 60F floor temp makes for chilly toes. W-A seems to be a better choice for cooling, at least until someone shows all of us how well a w-w heat pump can work to cool a house using radiant cooling

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This site is all about building a cool, energy efficient house, that makes maximum use of earth sheltered design, passive solar heating and cooling, geothermal exchange energy management, and right sizing of the house for it's designated use. The home's placement is on a south-facing hillside in Deep Creek Lake, Maryland. This site describes the design process, the technologies used and the expected results. We also have a comprehensive Links Page for anyone who is also interested in designing a similar project.