Posted by buickanddeere on February 19, 2011 at 10:54:55 from (216.183.153.98):
In Reply to: OT: Heat Pump Brands posted by HotCold on February 19, 2011 at 10:00:52:
Depends more on the application. Undersizing, over sizing or other design errors will make or break any system. Air to air units loose efficiency below being practical at approx 40F. Many ground source geothermal problems can be traced to under sized ground loop area. Well and pond source systems can suffer from dirt, minerals or low gpm flow. Cheapest improvement for any heating and cooling of any structure. Is to seal air leaks first and insulate the structure second.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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