On 13/04/2014 08:55, harryagain wrote:
"Johny B Good" wrote in message
...
On Sat, 12 Apr 2014 08:52:35 +0100, "harryagain"
wrote:


"Vir Campestris" wrote in message
o.uk...
On 09/04/2014 23:00, Tim Streater wrote:
One
was about the Norwich Heat Pump, about which I've never since seen a
reference.

http://archive.spectator.co.uk/article/5th-march-1948/11/the-heat-pump

Interesting read - but mostly because it was so long ago.

Andy

Amazing it never caught on back then.
More expensive than a coal fired boiler I expect.


If this ancient tech (counting in "PC Years") had taken off way back
then, just imagine the size of the hole in the Ozone Layer when it was
finally spotted from the satellite data!

They were probably using sulphur dioxode or ammonia as a refrigerant gas
back then.

Sumner used SO2.

It was in the late 19th century commercial refrigeration came in.

However, it was not until the 1940s that heat pumps were used for major
heating projects.

Then it was used on ships for transporting meat.

Plus dairy produce. Britain had the world's largest fleet of reefers
between the wars, bringing frozen lamb, butter and cheese from
Australasia and chilled beef from South America. Chilled beef was
carried in a 10% CO2 atmosphere, which gave the best quality of beef,
but WW2 made volume more important than quality, so they changed to
freezing even beef.

Colin Bignell