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Results show that the thermal efficiency improves with a decrease in minimum cycle temperature and with increase in maximum cycle temperature and pressure.
The effect of maximum cycle temperature on the optimum pressure ratio is negligible for lower values of minimum cycle temperature and maximum pressure, and the effect becomes significant with an increase in these parameters.
These operating ranges are minimum cycle temperature ranges between 302 and 315 K, maximum cycle temperature ranges between 1,320 and 1,360 K, maximum cycle pressure ranges between 1.449 and 2.830 MPa, and conductance of the heat exchanger ranges between 20.7 and 29.6 kW/K.
These operating ranges are as follows: minimum cycle temperature ranges between 302 and 315 K, maximum cycle temperature ranges between 1,320 and 1360 K, maximum cycle pressure ranges between 1.449 and 2.830 MPa, and conductance of the heat exchanger ranges between 20.7 and 29.6 kW/K.
It is found that improvements in the cycle efficiency of 1% or greater relative to previous analyses which arbitrarily fixed the minimum temperature and pressure can be realized through an optimal choice of the combination of the minimum cycle temperature and pressure (e.g., for a fixed minimum temperature there is an optimal minimum pressure).
Performances and main geometrical characteristic trends, such as plant height Z and two-phase column diameter DT PD have been drawn, varying the minimum cycle temperature between 15 and 25 °C and the user temperature, Tmax, in the range 60 70 °C.
Similar(54)
It also provides the results obtained from the sensitivity analysis including the effects of overall pressure ratio, turbo machine efficiencies, maximum and minimum cycle temperatures and pressures, recuperator effectiveness as well as pressure losses and leak flows.
The effects of the compressor and turbine efficiencies, regenerator effectiveness, pressure drop in the cycle and the ratio of maximum-to-minimum cycle temperature on optimum pressure ratios obtained by maximization of 1st and 2nd law efficiencies and work output are examined.
The results show the availability of an optimum regeneration temperature and rotational speed in which the output cycle temperature has a minimum value.
The minimum cycle mean of the graph is the minimum mean weight of a cycle.
Figure 8 Performance of computing minimum cycle basis.
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