Heat Pump Inquiry - HVAC - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum > HVAC Heat Pump Inquiry
 Register Blogs Articles Rewards Search Today's Posts Mark Forums Read

07-02-2013, 11:39 AM   #1
Member

Join Date: Jul 2011
Posts: 1,378
Rewards Points: 500

## Heat Pump Inquiry

Did some quick google searching and didn't find much in terms of an answer to this question...alot of articles, but nothing about my question, so here it is:

What is the maximum water temperature a typical water/air heat pump can handle?

My thought I want to investigate is to use solar hot water during the winter to supplement the ground source water and improve the COP of the unit. Is this pheasible? The solar hot water could be 120F or 140F and in extreme cases (if the pump was right) could, by code, be 180F. I don't want to "inject" the wells with the solar water as the btu losses would be too much.

Anyone have link to this info? Anyone have experience?

__________________
Life's too short...so enjoy it!

07-02-2013, 12:10 PM   #2
HVAC Tech/Owner

Join Date: Nov 2010
Location: VA
Posts: 640
Rewards Points: 604

Just off the top of my head, I eon't think a solar system could supply enough hot water to matter. I don't work on too many geo's but seem to remember the water supply being 3 gal per minute at whatever your ground water temp....

Which might raise the supply temp by..... m1U(ground) + m2U(solar) = (m1+m2)U(total)

 The Following User Says Thank You to Technow For This Useful Post: AGWhitehouse (07-08-2013)
 07-02-2013, 01:22 PM #3 Member   Join Date: Oct 2012 Posts: 372 Rewards Points: 446 Do the research and math on how many Btu's/hr the solar panels you're looking at can supply at any given entering water temperature. The cooler the water going in the more efficient the solar panels are. Any added btu's you put into the supply water to the HP will show as an increase in output which would easily be figured out by looking at the equipment's specs and seeing what the output rating is related to inlet water temperature (and GPM's). Might prove to be a better idea, if solar is the plan, to use the solar panels to supplement the HP in it's effort to heat the home in another fashion. For every Btu that the solar panels put into the house that amount of work won't have to be done by the HP. I suspect what you're looking to do is gain the advantage of "multiplying" the solar energy by running it through the HP. Thing is it takes energy to multiply it and money to set it all up. The best design is one where the principal of Keep. It. Simple. drives the outcome and potential for trouble free and cost effective operation.
 The Following User Says Thank You to old_squid For This Useful Post: AGWhitehouse (07-08-2013)

 07-02-2013, 04:46 PM #4 An old Tradesmen   Join Date: Oct 2008 Location: Somewhere Posts: 34,595 Rewards Points: 8,176 Most max out at 90°F for heating. You could use a mixing/tempering valve. __________________ When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions.
 The Following User Says Thank You to beenthere For This Useful Post: AGWhitehouse (07-08-2013)
07-08-2013, 11:30 AM   #5
Member

Join Date: Jul 2011
Posts: 1,378
Rewards Points: 500

Quote:
 Originally Posted by old_squid Might prove to be a better idea, if solar is the plan, to use the solar panels to supplement the HP in it's effort to heat the home in another fashion.
Thanks everyone for the input. From all my "tenticles" of questions, both here and elsewhere, I feel this is the best application of solar. Strictly supplemental heat source, not a "main" source.

My conclusion: Solar hot water collector direct to a storage tank. Motorized 3-way valve on the geo supply to direct the incoming geo field water through a coil in the SHW tank to bump the incoming temperature in times of available solar heat and a heating demand. Second SHW tank coil for domestic hot water pre-heat. If there is no solar, then the 3-way resorts back to traditional geo-field loop and domestic water enters the hot water heater at street temp. I think that's about as simple as one can get while utilizing solar heating.
__________________
Life's too short...so enjoy it!

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post no_limit_larry HVAC 4 11-05-2012 05:18 PM sweetfarm HVAC 3 10-11-2012 08:07 AM TimDavis HVAC 12 01-18-2012 07:06 AM pomelo HVAC 11 03-08-2010 08:13 PM ChrisDIY HVAC 7 03-06-2010 08:34 PM

Top of Page | View New Posts