Home  5  Books  5  GBEzine  5  News  5  HelpDesk  5  Register  5  GreenBuilding.co.uk
Not signed in (Sign In)

Categories



Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.
Buy individually or both books together. Delivery is free!


powered by Surfing Waves




Vanilla 1.0.3 is a product of Lussumo. More Information: Documentation, Community Support.

Welcome to new Forum Visitors
 Join the forum now and benefit from discussions with thousands of other green building fans and discounts on Green Building Press publications: Apply now.




Heating and cooling: ASHP Large House

Bottom of Page

31 to 37 of 37

  1. <
  2. 1
  3. 2
  4. >
    • CommentAuthornewnight
    • CommentTimeFeb 14th 2016 edited
     
    Posted By: djhSystem sizing should be done from the max heat load, not the average heat demand. i.e. instantaneous power required at -10°C rather than annual energy demand at say -1°C. But yes there wil be some times when the outside temperature drops to -20°C. In that case you rely on three things: (1) the averaging of space heating mentioned by Ed, (2) additional heaters such as I'm suggesting for warming from cold and (3) an acceptance that conditions are outside spec and you'll need to wear extra jumpers whilst it is so cold outside.


    The the heat load is 12.5KW Design External Temperature -3.9 °C
    It is very rare for the temp. to go this low.
    We are on the east coast of the island in a bay off the Clyde Estuary, facing The Holy Isle, so really quite sheltered.Will also have log burner to main living areas if it temp drops severely for extended periods + 13 tog duvets in bedrooms when needed.
      Lamlash Bay.jpg
    • CommentAuthorEd Davies
    • CommentTimeFeb 14th 2016
     
    Posted By: newnightWill also have log burner to main living areas if it temp drops severely for extended periods…
    Or the power goes off for extended periods.

    Been without power here in Caithness for 36 hours (last January). In a well insulated house that shouldn't be too much of a problem but much longer, particular if there's no solar gain, and you'll begin to worry.

    Nice piccy.
  3.  
    Posted By: newnightThe the heat load is 12.5KW Design External Temperature -3.9 °C


    What's the floor area of your house? This heat load sounds large to me. I have an ancient house with very little wall insulation (between 15 and 25mm), floor area 180m^2 plus 90m^2 of heated basement and the heatload is 15kW with an external temperature of -23C, internal 21C. For an external temperature of -3.9C, my house would only require around 9kW.

    Just curious.

    Paul in Montreal.
    • CommentAuthornewnight
    • CommentTimeFeb 21st 2016
     
    Posted By: Paul in Montreal
    Posted By: newnightThe the heat load is 12.5KW Design External Temperature -3.9 °C


    What's the floor area of your house? This heat load sounds large to me. I have an ancient house with very little wall insulation (between 15 and 25mm), floor area 180m^2 plus 90m^2 of heated basement and the heatload is 15kW with an external temperature of -23C, internal 21C. For an external temperature of -3.9C, my house would only require around 9kW.

    Just curious

    The floor area is 396sqm including internal walls
  5.  
    Stumbled across these two case studies which seem quite similar to the situation being discussed in this thread, although renovations rather than new build, both using heat pump and variable hot water demands.

    Not sure if i can make the links hot, first uses a GSHP, solar thermal, solar pv and LPG, second uses ASHP and an instantaneous hot water cylinder.

    https://businesswales.gov.wales/dmwales/sites/dmwales/files/pdfs/wern-watkin-bunkhouse.pdf

    and

    http://www.stiebel-eltron.co.uk/imperia/md/content/lg/stiebeleltrongreatbritain/privatecustomers/mere_brook_.pdf

    Anyone with more knowledge know which solution seems better and or the pros and cons of each?
    •  
      CommentAuthordjh
    • CommentTimeMar 29th 2016
     
    Posted By: stevethefarmNot sure if i can make the links hot

    Edit your post and select 'Text' at the bottom instead of 'Html'.
    •  
      CommentAuthordjh
    • CommentTimeMar 30th 2016
     
    There doesn't seem to be enough information about the actual efficiencies achieved or the running costs, or indeed the capital costs, to draw any conclusions.

31 to 37 of 37

  1. <
  2. 1
  3. 2
  4. >
Add your comments

    Username Password
  • Format comments as
 
Back to Discussions Top of Page
   
The Ecobuilding Buzz
Site Map    |   Home    |   View Cart    |   Pressroom   |   Business   |   Links   
Logout    

© Green Building Press