How Heat Pumps Work
Steve Brown Development Director for Envirotec Ltd explains the theory behind how heat pumps work: Heat pumps use the same technology as is used in a refrigerator, exploiting the temperature difference between the refrigerant gas and its surroundings. Both rely on three key facts.
Heat will move down a ‘temperature gradient’ from a higher temperature to a lower temperature.
When a liquid changes to a gas, heat is extracted from the surrounding to provide the energy for this change (e.g. boiling water to steam).
Refrigerant gases have a boiling ...
The Zero race aims to take electric vehicles round the world in 80 days - non-driving time spent on boats and so on discounted. It isn ...
It may be a tad early to expect electric cars to zoom around speedways at 200 miles per hour. So the noise, commotion and fumes ...
RSS feed of selected pulses
The August 2010 edition of National Geographic has an interesting article on the " Synthetic tree " idea, which I've posted about previously. Looks like development ...
According to Ars Technica , "a team of scientists has invented a new type of solar cell that converts both the sun's heat and light ...
The average British household wastes £37 each year by leaving appliances on stand-by reports the UK manufacturer of a smart power socket that turns off ...
What ought to be required reading for all wattwatters:
Lighting calculator - LED against incandescent
(French) Department of energy and the environment