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.
When the valet parking is free, like at an event or a country club, then I tip more like $5-$10. When you're paying for parking, I generally tip less, like 15-20% of the parking fee, which is generally more in the $2-$4 range. That may account for the difference in averages. 1-10 of 25 replies.