Tab Content
kzb's Activity
About Me
Tab Content
  • kzb's Avatar
    Yesterday, 12:01 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    So in LA the break-even COP is 5.1 assuming a gas boiler efficiency of 92%. In Portland it is only 4.2. Maybe in these climates these COPs are...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-09, 02:57 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    Redding looks like it is the California equivalent of Fort William. London and Sheffield together make up nearly a quarter of the entire UK...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-09, 12:44 AM
    kzb replied to a thread Heat Pump Question in Science and Technology
    I can see heat pumps being quite sufficient in the California climate. In areas with harsher winter conditions not so good. The performance and...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-08, 08:30 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    In Britain, people seem to be prescribed 11kW, or perhaps 18kW heat pumps for larger houses. Not 44kW. My condensing gas boiler is nominally 30kW...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-08, 07:32 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    It sounds like it could be a nifty piece of kit to me. You don't have to direct the cold air into the kitchen, if you want heating only you would...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-08, 01:19 AM
    kzb replied to a thread Is Dark Matter Equivocal in Science and Technology
    So, what about this fifth force of nature? https://www.bbc.co.uk/news/56643677 A fifth fundamental force might help explain some of the big...
    see more
    70 replies | 2410 view(s)
  • kzb's Avatar
    2021-Apr-08, 12:06 AM
    kzb replied to a thread Heat Pump Question in Science and Technology
    Well look at this ! Any comment? https://thermopedia.com/content/837/ Quote (my bold): <<Air-Cycle Heat Pumps Consider a system in which...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-07, 09:08 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    I kind of knew that if it was as good to do without a refrigerant, they would already be doing it. What set me off was seeing the miserable...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-07, 08:57 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    Actually 20 minutes after I wrote that, I realised that in that equation the only energy is coming from the compressor. If that equation was...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-06, 11:46 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    Duplicate
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-06, 11:45 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    I had an epiphany the other day. The answer to the problem is surely: Heat given out = work done in adiabatic compression - work done in...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-06, 01:43 PM
    kzb replied to a thread Measuring calories in Science and Technology
    It's surprising what will burn in hyperbaric 100% oxygen ! TBH, I've no experience of bomb calorimetry with milk. I suspect that they do dry it...
    see more
    44 replies | 1031 view(s)
  • kzb's Avatar
    2021-Apr-04, 01:29 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    OK I realise the cooled compressed air represents stored energy that is lost by simply releasing it outside, without recovering that energy. My...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-03, 05:35 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    The setup as I described it is nothing to do with achieving work. You are thinking of a heat engine where we are usually interested in getting...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-03, 12:14 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    I still don't think the COP can be less than 100%. If the air is rejected to the atmosphere at a temperature below which it was taken in (from...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-03, 12:02 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    OK thanks but without numbers it doesn't really help me.
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-03, 12:44 AM
    kzb replied to a thread Heat Pump Question in Science and Technology
    I probably didn't put the question very well. In retrospect I am curious about the equations which would give the heat output of such a system and...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-03, 12:42 AM
    kzb replied to a thread Heat Pump Question in Science and Technology
    Yay finally we are getting somewhere ! All we need now is some numbers on the sketch, or some equations which explain the process, or better still a...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-02, 01:37 AM
    kzb replied to a thread Heat Pump Question in Science and Technology
    I know you've said it, but just saying it doesn't mean you've proved it. There's lots of things been said on here and they can't all be correct.
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-01, 10:04 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    I'm not against this, but one thing at once. I am not 100% convinced that using the cooled compressed air would increase efficiency. That is...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-01, 10:00 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    The problem is no-one has explained why it is not practical for that function.
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-01, 09:57 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    https://en.wikipedia.org/wiki/Adiabatic_process#Example_of_adiabatic_compression Scroll down to: Example of adiabatic compression
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-01, 03:27 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    The thermodynamics has not been explained on here ! Somebody, somewhere, knows how to calculate the thermodynamics of the process I described, but...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-01, 03:19 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    This must be wrong as well. Heat is injected into the house by the compressed air. It cools from 793K to the inside temperature. It gives out...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Apr-01, 03:10 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    I think this must be wrong. The Wikipedia article calculates a temperature of 793K for 10:1 compression ratio. PV/T being constant is not...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Mar-31, 05:53 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    Resistive heat wouldn't be much better, it is ruinously expensive. Here in Britain it is anyhow. The whole idea is to get COP over 1. You need a...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Mar-31, 01:50 AM
    kzb replied to a thread Heat Pump Question in Science and Technology
    Well your first sentence is really one of the questions I am asking. Yes, it is a given that the waste heat from the compressor is used to heat...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Mar-31, 01:45 AM
    kzb replied to a thread Heat Pump Question in Science and Technology
    It's certainly an interesting question if mechanical energy could be recovered from the outside pressure release, to help run the compressor. But...
    see more
    111 replies | 1417 view(s)
  • kzb's Avatar
    2021-Mar-29, 10:37 PM
    kzb replied to a thread Heat Pump Question in Science and Technology
    Thanks I will try and find that later.
    see more
    111 replies | 1417 view(s)
More Activity
About kzb

Basic Information

Statistics


Total Posts
Total Posts
2,721
Posts Per Day
0.47
General Information
Last Activity
Yesterday 12:01 PM
Join Date
2005-Apr-07
Referrals
0