SteamyTea

Mug. Milk. Sugar is best in a pudding. The real secret is that if you try to extract more than half the energy avialable, then systems start to get inefficient. This us not the same as having a system that is double the required size. This is really what sets the sizing if a system.

500 quid buys a lot of booze.

You used to be able to get cans of nitrogen (I think). This came as a kit, with a bit of pipe insulation, to freeze water in pipes if you could not turn the supply off. https://www.wickes.co.uk/Wickes-Pipe-Freezing-Kit/p/424921 Seems (expletive deleted)ing odd way to get some foam off, just use the correct solvent, which is not acetone.

Yes. By modulating the power during a heating cycle, they can optimise the CoP. This is because heating is not linear. When you have a large temperature difference between a hot body and a cold surroundings, you have high losses, when the temperature difference is small, you have lower losses. Therefore, when heating initially starts, you can put in less energy for a similar temperature rise. As temperature parity gets closer, you have to put in more energy (mathematically, when the surroundings is an infinite heat sink, you can never reach parity, unless you have infinite energy. This is why 'warp drives' don't exist, but the infinite probability drive might). By having the control to modulate during the heating cycle, frosting can be reduced i.e. work the ASHP less hard or take less heat out the ground, for a bit longer. Then increase the flow temperature from the HP as you reach maximum temperature, but for short amount of time. Frosting is a combination of time, flow rates, temperature differences, and in the case of ASHP, relative and absolute humidity. It is all about finding the sweet spot as all the above varies. Worth remembering the the overall temperature differences that a HP works are are similar to a thermal boiler, just lower down the scale. Why we should really use the kelvin scale and not the pesky, arbitrary celsius one. Or create a new temperature scale that has zero at the coldest that the refrigerant gas gets to. Then you will see temperature rises of 90 STs (going to name this scale after me, have to be careful though as we have an St, for stanton number, St = h/pvcp, where h is coefficient of heat transfer, p is density, v is velocity, and cp is specific heat capacity at constant pressure, it is used in geothermal energy, well it should be, but I think it gets forgotten about).

You don't have a fan on a GSHP. It is the compressor that needs the omph to get started. Think a large diesel engine starting from cold. Except higher pressures.

Only a few minutes to set up a spreadsheet and work it out yourself.

Will that be the very small, Cornish, Kensa, that employed a mate of mine. I would take that claim with a pinch of Cornish Sea Salt.

And you can fit it all yourself, except maybe the pump wiring.

Always worth keeping a bit alive, you may want to transplant a bit into a neighbours garden to reduce the value of their property.

Sometimes, the obvious is so simple.

Or about 125 tonnes of carbon dioxide 622kg/tonne). Which is about the same amount my driving has caused in the last 20 years (30,000 miles/year at 0.2 kg/mile).

Drinking coffee here.

Explain why please. I understand that they control flow rates, regardless of inputs and outputs. I may have misunderstood it though.

If there is some expanding foam between the joists and the insulation boards that will act as an adhesive. Just a matter if how much. As you have around 20mm difference, you could fit some counter battens on 20mm off stands from the joists. Just depends how easy it is to get under the floor. And builders can be twats, they forget who is paying them.

The closer the mass is to the joist the better. Think of it as a torque, the longer the spanner, the more you have to move the free end. That free end is the deflection. https://www.engineeringtoolbox.com/beam-stress-deflection-d_1312.html

I have a washer dryer, the dryer part is a condenser. Had it about 10 years now, probably used the dryer less than 10 times. I did spend a whole pound, at Poundland earlier this year on a new washing line. That is the third one I have bought in 20 years. Trouble is, they are too long, so I found the unused half of the previously bought one, as I was putting the remains of the new one away. So that is the next 20 years sorted.

How much insulation do you have under the ground floor UFH pipework? Your flow temperatures seem high. So about 10 hours 7.3 kW X 10 h = 73 kWh You don't mean this, you mean kWh.

That is towards the very top temperature for an ASHP. It will kill the CoP.

Coefficient of Performance is just Power Out / Power In. But it needs to be within fixed bounds i.e. output temperature 35°C, external temperature 7°C. SCoP is a method to try an mimic real life conditions, so will have a weighted average for different output temperatures and different external temperatures. So a SCoP in maritime Cornwall will be different from maritime Newfoundland, which will be different from the Swiss Alps, which are different from Idaho's Snake River Plain. I would rather see an isothermal chart. But then I understand them.

Possible SCoP. Dividing max output by Max input does not really work out the CoP.

Not significantly. They all work the same. Don't get temperature and energy mixed up, there is a reason that the words are different.

Why have you not got space for a DHW cylinder?

Is that why the challengers are poaching from the big automotive companies. Still, if the new people can, via software, stop wipers smearing damp dirt over a windscreen, stop headlights dipping when they spot a reflection, brake lights coming on when speed creeps over a set speed (followed a truck yesterday that did this, really annoying) and if Tesla can stop their cars doing emergency stops when the AI picks up on a speed limit sign on the back of a vehicle in front, then I will start to trust software engineering. I think all that is needed is power, temperature and CoP control, with simple overides i.e frost sensing and ToD control.

How many times do I have to push your button. For some reason I am still a Number 2.

They tried to televise it down here, but considered to immoral, but you can get it from your favourite website that starts with an X.