Recent content by pd2905

How does delta S stay zero in both directions? So the reversed Carnot is the refrigeration cycle, but do these heat pumps use only one cycle, and is it possible that they have some newer technologies so that the efficiency of an air-air heat pump reaches 4 or 5 up to -20 degrees C?

Thanks for the reply DrClaude, just to add to your thing there is heat pump systems that are air-water, water-water and air-air( air conditioner inverter). For an ideal heat pump cycle: COP = TH/(TL-TH) source wikipedia.

Thanks for your input, Just to add to this For an ideal heat pump cycle: COP = TH/(TL-TH) source wikipedia.

Hi guys can anyone please tell me that it is possible with an air conditioner of type inverter to put less energy than what the piece is receiving as heat. So let's say that on the inverter it says output KWh/ input KWh =4. Henthalpy= G+TS 4*Hinput= Houtput inside the house So to heat my...

Homework Statement A ski pole is bent(plastic deformation) in three point bending by applying a load 2F perpendicularly to the ski pole. The forces at the end points are of magnitude F. If the pole yields due to plastic deformation at the mid point longitudinal span of the ski pole which is...