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  • kzb's Avatar
    Yesterday, 07:04 PM
    If the SO2 was oxidised to SO3, it would then be absorbed by sulphuric acid. This is the Contact Process for manufacturing the acid. Where are...
    3 replies | 91 view(s)
  • kzb's Avatar
    2021-Apr-10, 12:01 PM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-09, 02:57 PM
    Redding looks like it is the California equivalent of Fort William. London and Sheffield together make up nearly a quarter of the entire UK...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-09, 12:44 AM
    I can see heat pumps being quite sufficient in the California climate. In areas with harsher winter conditions not so good. The performance and...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-08, 08:30 PM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-08, 07:32 PM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-08, 01:19 AM
    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...
    70 replies | 2479 view(s)
  • kzb's Avatar
    2021-Apr-08, 12:06 AM
    Well look at this ! Any comment? https://thermopedia.com/content/837/ Quote (my bold): <<Air-Cycle Heat Pumps Consider a system in which...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-07, 09:08 PM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-07, 08:57 PM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-06, 11:46 PM
    Duplicate
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-06, 11:45 PM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-06, 01:43 PM
    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...
    44 replies | 1036 view(s)
  • kzb's Avatar
    2021-Apr-04, 01:29 PM
    OK I realise the cooled compressed air represents stored energy that is lost by simply releasing it outside, without recovering that energy. My...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-03, 05:35 PM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-03, 12:14 PM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-03, 12:02 PM
    OK thanks but without numbers it doesn't really help me.
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-03, 12:44 AM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-03, 12:42 AM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-02, 01:37 AM
    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.
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-01, 10:04 PM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-01, 10:00 PM
    The problem is no-one has explained why it is not practical for that function.
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-01, 09:57 PM
    https://en.wikipedia.org/wiki/Adiabatic_process#Example_of_adiabatic_compression Scroll down to: Example of adiabatic compression
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-01, 03:27 PM
    The thermodynamics has not been explained on here ! Somebody, somewhere, knows how to calculate the thermodynamics of the process I described, but...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-01, 03:19 PM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Apr-01, 03:10 PM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Mar-31, 05:53 PM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Mar-31, 01:50 AM
    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...
    111 replies | 1426 view(s)
  • kzb's Avatar
    2021-Mar-31, 01:45 AM
    It's certainly an interesting question if mechanical energy could be recovered from the outside pressure release, to help run the compressor. But...
    111 replies | 1426 view(s)
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