Comments for Eagle Mountain Journal http://www.eagle-mt.com/blog Wed, 12 May 2010 16:48:10 -0700 http://wordpress.org/?v=2.8.1 hourly 1 Comment on Geothermal Heat Pumps and Generator Sizing by sunny http://www.eagle-mt.com/blog/geothermal-heat-pump-generator/comment-page-1/#comment-225 sunny Wed, 12 May 2010 16:48:10 +0000 http://www.eagle-mt.com/blog/?p=86#comment-225 Some geothermal heatpump companies offer such a product already. My Waterfurnace has Intellistart which gives it a softer start up so it needs a smaller generator. Some geothermal heatpump companies offer such a product already. My Waterfurnace has Intellistart which gives it a softer start up so it needs a smaller generator.

]]> Comment on Propylene Glycol Mixture: Geothermal Freeze Protection by Geothermal Loopfield Flush Cart « Eagle Mountain http://www.eagle-mt.com/blog/propylene-glycol-mixture-geothermal-freeze-protection/comment-page-1/#comment-59 Geothermal Loopfield Flush Cart « Eagle Mountain Wed, 14 Apr 2010 20:15:10 +0000 http://www.eagle-mt.com/blog/?p=27#comment-59 [...] to the pump and then connect the pump to the other fitting on the pump panel.  Mix water with the propylene glycol that you purchased with your geothermal loop field.  The proper ratio is 25/75 fluid to water [...] [...] to the pump and then connect the pump to the other fitting on the pump panel.  Mix water with the propylene glycol that you purchased with your geothermal loop field.  The proper ratio is 25/75 fluid to water [...]

]]> Comment on How to select a heat source for your radiant heating system by Jason http://www.eagle-mt.com/blog/select-heat-source-for-radiant-system/comment-page-1/#comment-52 Jason Tue, 30 Mar 2010 18:21:09 +0000 http://www.eagle-mt.com/blog/?p=13#comment-52 It's not that it takes longer, I'll update the blog post, It's that it can't transfer the heat in the needed amount of time or flow rate. Remember, the water is flowing continuously through the tank, not sitting there waiting to be used again like domestic hot water. A hot water tank is not efficient at raising the water only 20 degrees because it has only a small amount of surface area for the volume of water. Once a dhw tank's temperature has been "dumped", it can take a long time to have hot water again, which is what the recovery rate is. It can't heat the water while you are using it due to the low surface area per quantity of water. It’s not that it takes longer, I’ll update the blog post, It’s that it can’t transfer the heat in the needed amount of time or flow rate. Remember, the water is flowing continuously through the tank, not sitting there waiting to be used again like domestic hot water. A hot water tank is not efficient at raising the water only 20 degrees because it has only a small amount of surface area for the volume of water. Once a dhw tank’s temperature has been “dumped”, it can take a long time to have hot water again, which is what the recovery rate is. It can’t heat the water while you are using it due to the low surface area per quantity of water.

]]> Comment on How to select a heat source for your radiant heating system by Will K http://www.eagle-mt.com/blog/select-heat-source-for-radiant-system/comment-page-1/#comment-49 Will K Tue, 30 Mar 2010 16:52:32 +0000 http://www.eagle-mt.com/blog/?p=13#comment-49 I looked at your article about small radiant systems. I think you need to add a little to explain exactly how it is possible for this to be true: "It takes much longer to make warm water hot than to make cold water hot." Especially considering that at some point cold water becomes warm. Lacking a time warp of some kind physics does not support the statement. Perhpas you need to discuss something of differentials on two elements of an electric heater. With a gas or oil fired unit that puts out a constant BTU of heat warm water simply requires fewer BTU to become hot than cold water (and with less potential heat loss in the system.) I looked at your article about small radiant systems. I think you need to add a little to explain exactly how it is possible for this to be true: “It takes much longer to make warm water hot than to make cold water hot.” Especially considering that at some point cold water becomes warm.

Lacking a time warp of some kind physics does not support the statement. Perhpas you need to discuss something of differentials on two elements of an electric heater. With a gas or oil fired unit that puts out a constant BTU of heat warm water simply requires fewer BTU to become hot than cold water (and with less potential heat loss in the system.)

]]> Comment on Propylene Glycol Mixture: Geothermal Freeze Protection by Install Geothermal Heat Pump in the Attic « Eagle Mountain http://www.eagle-mt.com/blog/propylene-glycol-mixture-geothermal-freeze-protection/comment-page-1/#comment-26 Install Geothermal Heat Pump in the Attic « Eagle Mountain Mon, 29 Mar 2010 19:55:10 +0000 http://www.eagle-mt.com/blog/?p=27#comment-26 [...] This “Hot Box” solution allows for two things.  First, it allows the heat pump to be placed in a conditioned space for optimal performance and efficiency.  Secondly, it allows the attic to remain unconditioned to conform to the outdoor temperature.  This is important, especially in winter, if ice damage is a concern.  Also, the attic will not be comfortable in the winter and then uncomfortably warm in the summer.  It is also important to note that piping from your geothermal loopfield to the heat pump must be insulated and contain the correct propylene glycol mixture for geothermal systems. [...] [...] This “Hot Box” solution allows for two things.  First, it allows the heat pump to be placed in a conditioned space for optimal performance and efficiency.  Secondly, it allows the attic to remain unconditioned to conform to the outdoor temperature.  This is important, especially in winter, if ice damage is a concern.  Also, the attic will not be comfortable in the winter and then uncomfortably warm in the summer.  It is also important to note that piping from your geothermal loopfield to the heat pump must be insulated and contain the correct propylene glycol mixture for geothermal systems. [...]

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