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In early 2003, I remember hearing a radio news report that a photovoltic cell had been developed, which was made mainly of a plastic. It was suppost to be 20 times more efficient than the best silicone. It was suppost to be cheap to make too. I haven't heard anything about it since. I suppose...

I have been out of the a/c and refrigeration loop for several years, but I have found myself back. I had been an electrical inspector and focusing on that. I have heard about 134a of course, but I know there several new ones out there. Then there are the polyester oils? I will be happy with...

I have been out of the a/c and refrigeration loop for several years, but I have found myself back in it. I had been an electrical inspector for a number of years and focusing on that. I would be happy with generalities, but specifics are nice. If anyone knows of good books or mags on the...

The difference must be either the higher temps. and pressures for driving engines or generating electricity, or the design of the valves themselves?

Thanks! That is what I thought.

I should note that valve A is a 90 degree bend valve. Valve B is a straight.

I have recently gotten into boilers. I am a trainee. I help maintain two boilers that are used for heating several academic and dorm buildings at a university. The smaller of the two puts out up to 40 tons of steam per hour. During colder periods we start up the larger boiler, which can put out...