Hi all,
We got these rad reflector foils to improve your heating bills in our shop today. Trying to figure out if there any good.
As a really quick test to see if they do anything, i stuck one to the kettle and measured the temp difference with a thermal imaging camera. (pics attached)...
No, I was thinking 100% of heat comes from ground but it costs you 25% in electrical energy to convert it into usable energy. I thought the conversion process didn't add any additional heat but it does.
i.e. if you had a 4 kW heat pump, you would cool the ground by 4 kW not 3 kW.
But just...
This is what I was getting at but I have since found the answer:
If a 4 kW heat pump (for heating) has a COP of 4 (COP => 1 unit in/4 units out = .25), do you size the collector for 3 kW or 4 kW? Does 100% of the heat get taken from the source and you need 25% electrical energy to convert it...
Cheers for the reply. It answered my question but it appears I am wrong.
http://en.wikipedia.org/wiki/Coefficient_of_performance
"A geothermal heat pump operating at 3.5 provides 3.5 units of heat for each unit of energy consumed (i.e. 1 kWh consumed would provide 3.5 kWh of output heat)...
Hi all,
Question about compressing a gas. When you compress a gas it heats up. Does the compression supply a certain amount of energy to raise the temperature or does the compression merely raise the temperature using the energy that was already present in the gas?
What I am getting at is the...
Hi all,
I am wondering about heat pumps, not necessarily ground source heat pump.
What percentage of heat is taken from the ground?
My understanding was that 100% of the heat is taken from the ground but it costs 25% (if COP of 4) in electrical energy (running the compressor) to...
Firstly cheers for the reply and nope it isn't homework or anything alike. I spent ages writing out a proper reply a minute ago and it all got wiped so I will keep this one short.
Yes its the lumped approach at the moment but I am building in complexity. Start simple and get basics correct...
Hi all. I am wondering how long it takes for heat to leave building.
This is the example I have been working on:
A building is 203m^3 and we want to raise temp from 10C to 21.3C.
Vol=203m^3 => mass = 244kg (density may not be completely correct but doesn't matter)
Cp=1.005 kJ/kg.k
Q...