£5k eh? What will you spend yours on. Wine, women or song?
Have you actually watched the video? Do you UNDERSTAND the section on the temperature rise calculation? Perhaps, as I have offered evidence you might care to offer your criticism, rather than hand waving and asking me for more? What do you think of the graph (source Green BP) of coal consumption in China against the West? We have reduced, they have vastly increased and will continue to do so. What we do is pointless and extremely expensive, the electricity alone will cost £4.2 Trillion (source National Grid) of capital. What is underlying your comments (sources please)? You will note that only the Russian model is matching data for the last 40 years. Why do you think that is “modelling” because data proves models.
davezawadi (David Stone):
Have you actually watched the video?
How about answering my question about your contentions about the CO2-equivalent emissions in 2020?
And then, when we have done that, we'll go on to the other claims that seem to impress you. But probably on a different thread, because, although you're pumping a lot of heat out, it doesn't seem to have much to do with heat pumps :-)
Probably not Jon, but I detect something else. His ideas spring from very bad computer programming using arbitrary methods. Strangely this appears to be how all computer “people” now work, the amount of software in use that doesn't work properly is causing extreme damage to society. My own observation is that properly testing a piece of new code takes at least 10 times as long as designing and writing it. This is very boring and time-consuming, and so this step which is essential is now ignored in the development process. None of the supposed climate simulation programs have been tested as correct in any way, we have tons of real data for comparison with the simulations, yet none of them can reproduce the actual results with any degree of accuracy. The little ice age has been wiped out, the pauses and restarts of the last 100 years do not appear in any of the alleged model results. To then attempt to use such a “model” to forecast future climate is clearly stupid.
The most important point is that none of the models correctly mimics the strongest and most prevalent “greenhouse” gas, water vapour. Clouds are enormously significant, as is a shower dumping 1000's of tonnes of water on an area. This is dismissed a just “weather”, but the weather is the most significant factor in ground temperatures, as we feel ourselves every day. All of the “global warming” numbers come from tropospheric temperatures, but very little is understood on how these affect weather. If we knew accurately forecasting would be much more accurate, interestingly forecasts seem to have got worse over the last 10 - 20 years since the met office added “climate change” into the forecasting models!
Peter Bernard Ladkin:
. . .
Denis McMahon:
When we moved to Hampshire, in the mid-1980s, we saw ducted air heating installations in several houses, including in the one we eventually bought. ……..
There are some downsides to ducted air heating…… this system can be easily designed and built into a new house but adapting to an older house, …..is less easy and probably very expensive.
There are individual devices for individual rooms which exchange air with the outside, and which exchange heat during the air exchange. They are not large. The specs for one device I have been looking at are roughly 38cm^2 cover, sticking out 5cm into the room (you get a 35cm to 60cm hole in your outside wall). They claim 82% thermal efficiency through heat exchange, and you can get them to exchange 15 m^3/hr to 55 m^3/hr for the same wall space. They are not noisy – claimed 25dB at 30 m^3/hr.
You just have to find that 38 cm^2 patch per room outside wall.
It solves both problems of course: heating and air exchange.
. . .
We once had a through-the-wall gas convector heater in a former house. It heated the room quite effectively, without telling other rooms all about it. It is not suprising that this through-the-wall idea has been applied to heat pumps. Really, they are similar to the air conditioning units one sees in hot countries, but working in reverse.
The is some merit in heating rooms individually rather than centrally; it calls for more-accurate control of temperature and avoids the problem of radiators with water not really warm enough. However the cost of several of these units is likely to be more than that of a central system. And what about heating the water?
Denis McMahon:
…… And what about heating the water?
Yes, well ……
Back to air. I have up to 3m ceilings. When I stand on a ladder to sample, the air below the ceiling is warmer and dryer than the air at people level. Of course.
That surely suggests that some sort of fan will help distribute heated air more uniformly. Why isn't it done?
One answer for me is that warm ceiling air leads to warm interfloor space which is in effect underfloor heating for the next level. That works well for my sleeping quarters up top, which I don't specifically heat, even in the -18° overnight temperatures we had for a while in February 2021.
Insulation is probably the best way to go for many of us, although the large variation is sizes, construction types and materials make this a ‘wet finger’ assertion. The ‘passivhaus’ should in principle be so well insulated that the heat generated by the occupants' bodies, the fridge freezer and cooking should keep the inside temperature above 18 degrees. Clearly, this also requires a heat exchanger to pre-warm incoming air as the complete draughtproofing would make the place very damp without forced ventilation.
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