Forum Replies Created
-
Posts
-
Air source heat pumps also have the problem that their (outdoor) radiators freeze is cold weather, so they have to run an electric heater (outdoors) to keep melting the ice. This lowers their cold weather efficiency even more, I imagine it might even make it negative (You have to put more energy into stopping the radiator freezing then it can extract from the cold air).
I did some more reading on this and it seems that you can avoid this issue on reversable heat pumps (ones that also work as air conditioners) by reversing the flow and using heat inside the house to melt the ice.
So it should always be at least a tiny bit more efficient than resistive electric heating unless its about -20C outside.
Air source heat pumps also have the problem that their (outdoor) radiators freeze is cold weather, so they have to run an electric heater (outdoors) to keep melting the ice.
This lowers their cold weather efficiency even more, I imagine it might even make it negative (You have to put more energy into stopping the radiator freezing then it can extract from the cold air).
Ok… you have no idea how these pumps work or the running’s involved. Dra is right, they’re electric heaters….for every 1Kw of electricity you put in… you get 3Kw of heat out.
That depends on the heat transfer coefficient, which is determined by the design of the heat pump, and mostly by the temperature and humitity of the air.
Under an ideal situtation the coefficient can be a 1:3 ratio, but that’s when the air has a lot of thermal energy to extract. That’s why they are used as air conditioners.
I ask you again, if the outside air is cold, where does the energy come from?
Errrr hmmm……no The colder it is… the better they work. If you put your hand behide a fridge you can feel the heat. Think of an air source heat pumps as a fridge working in reverse.
No, that isn’t how they work at all.
The function of a heat pump is to move thermal energy from one place to another.
To heat the inside of a house, they must move thermal energy from outside of the house. If it is cold outside (when you normally want heating) then there is not much thermal energy to pull from the air to move it inside.
Not sure how you think this could possibly work better in the cold, where does the energy come from?
They work fine as air conditioners, but for heating they aren’t much more efficent than a normal resisitive heater.
Actually they are probably worse than normal electric heaters as the compressor (the thing that consumes most of the electric) would be outside of the house.
If you have an electric oven you might as well just use that as a heater.
1 member liked this post.
My understanding is that air source heat pumps are more or less useless as heaters as when it is cold outside (when you usually would want heating) there is very little heat energy that can be extracted from the air.
They work fine as air conditioners, but for heating they aren’t much more efficent than a normal resisitive heater. You need ground source for efficient heating.
1 member liked this post.
Because at them stages it isn’t life (cant survive/grow on its own)
I don’t agree that being able to survive on your own is the correct criteria.
Humans don’t really meet that until at least the age of 3 years. You also raise issues about whether people in comas or other vegitative states have human rights or not, as they would be unabled to survive on their own.
1 member liked this post.
9 months yes murder.
6 weeks termination? No.
10 weeks termination? No
16 weeks termination? No
Why?
Drac. A termination is nor murder. If that was it would be illegal in 99% of the country’s of the world.
It is very clearly murder at some stage of development.
I thought this debate is about at when that stage is, not if murder should exist or not.
I’ve seen some people say that post-natal terminations should be legalised, but I assume you are not one of these monsters. Would you agree that terminating a baby at 9 months is murder?
I guess you wouldn’t mind visiting the father in jail, drac ?
Perhaps she thinks every child should know his dad
I don’t believe that parental status is termined by genetics.
