These calculations are repeated for several strokes, until the difference between p1 and p2 is negligibly small. The resulting boundary work terms of all strokes are added to give a total value, and then the result is divided by the time required for the strokes to occur to obtain the average power output of the system.
Temperature of heat source (oC/oF) |
50/122 |
Temperature of cold sink (oC/oF) |
10/50 |
48 gallon tank configuration (2 pair) | |
Overall heat transfer coefficient, U (Btu/h ft2 F) |
8.36 |
Heat transfer rate, Q (Btu/h)*(per tank) |
26,304 |
Operating pressure (psig) |
300 |
Carnot efficiency (%) |
12.38 |
Projected hourly output for 4-tank configuration, each tank having 48 gal. |
1.92 |
(kW h) | |
Projected daily output for 4-tank configuration, for 10 h/day operation (kW h) |
20 |
Revenue for 10 h operation at $110/MW h ($) |
2.20 |
Annual revenue for 10 h operation/day at $110/MW h ($) |
803 |
432 gallon tank configuration (8 tanks) | |
Overall heat transfer coefficient, U (Btu/h ft2 F) |
8.00 |
Heat transfer rate, Q (Btu/h)* |
208,469 |
Operating pressure (psig) |
300 |
Carnot efficiency (%) |
12.38 |
Projected hourly output for 8 pair-tank configuration, each tank having 432 |
30 |
gal. at 50% efficiency (kW h) | |
Projected daily output for 8-pair tank configuration, for 10 h/day operation |
304 |
(kW h) | |
Projected daily output for 8-pair tank configuration, operating 10 h/day high |
516 |
output and 14 h/day low output (kW h) | |
Projected hourly output for 8-pair tank configuration, for 24 h/day steady op- |
729 |
eration (kW h) | |
Revenue per day at $110/MW h for 10 h/day high output and 14 h/day low |
56.77 |
output ($) | |
Revenue per day at $110/MW h for 24 h/day steady operation ($) |
80.15 |
Revenue per annum at $110/MW h for 24 h steady operation ($) |
29,253 |
* The heat transfer rate is evaluated as Q = UAA.T.
* The heat transfer rate is evaluated as Q = UAA.T.
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