The net work of the cycle is defined by the difference between the turbine work and the pump work: If the pump work is neglected, the net work of the cycle reduces to: Then the thermal efficiency of this system is defined by the rate between the net work and heat transfer from the boiler: Air-Fuel ratio and Air Excess.
At The Airport Valet, we believe that you should only tip commensurate with the service you receive. That said, currently the average tip is $3.00 - $5.00 on both departure and arrival. However, daily our valetsâ tips do range from as low as $1.00 to as high as $30.00.
Jul 29, 2012, 11:20 AM. I dont tip for valet parking (unless its free), thats what you are paying them for. We spend a few days each holiday down in FL, where pretty much all of the hotels charge for mandatory valet parking, and they charge $20 + per day.