On page 186 are two letters discussing the merits of water and hot air ... of steam used ; the feed pumps ef the Ericsson engine bave to feed in 491 volumes of cold air for every 875 volumes ...

A common beam engine had been tans-form ed into the hot air engine by the addition of the heating air pump a nd other requisites. The great trouble with the air engine was the cracking of the ...

For example, [Tom Stanton] took a previous air engine design, did away with the air compressor, and instead used gravity and water to create just a few PSI to run the engine. The basic setup is to ...

Daikin has released a line of residential heat pumps ... hot water up to 75 C. Daikin Europe NV, a subsidiary of Japanese heating system manufacturer Daikin, has introduced a new residential air ...

but the clever part lies in how he uses it as a ground source pump rather than an air source. He carefully bent the tubing of the aircon to allow hot and cold radiators to sit in water baths ...