Steam Ranking Reciprocator System. 15 kWe (nominal) solar thermal-electric power conversion concept definition study
A study was undertaken to define a concept of a nominal 15 kWe steam Rankine power conversion subsystem for a point focusing distributed solar thermal-electric system. A mathematical model of the Jay Carter Enterprises steam engine concept was developed in order to conduct a parametric analysis covering a broad range of steam inlet pressure and temperature as well as variations in engine configurations and condensing temperature. As a result of the parametric study, a design point at 677/sup 0/C (1250/sup 0/F) and 17.2 x 10/sup 6/ N/m/sup 2/ (2500 psi) was selected as maximum inlet steam temperature and pressure with a maximum solar thermal power of 80 kW. Conceptual designs were developed for a simple cycle and a compound reheat cycle engine concept. The simple cycle concept employs a single cylinder simple cycle uniflow expander. The reheat concept employs a 3600 rpm, compound- reheat cycle reciprocating expander containing a single high pressure cylinder and a single low pressure cylinder with the steam being reheated to the maximum inlet temperature after expansion by the high pressure cylinder. Both expanders have counter-rotating counter-balance shafts to perfectly balance the expander and eliminate vibration. Except for the difference in expanders the two concepts are identical. Power generation is accomplished with a three-phase induction motor directly coupled to the expander and connected electrically to the public utility power grid. It is concluded that the reheat cycle concept has a maximum heat engine efficiency of 33 percent and a maximum power conversion efficiency of 30 percent as compared to the simple cycle efficiencies of 28 percent and 26 percent.
- Research Organization:
- Carter (Jay) Enterprises, Burkburnett, TX (USA)
- DOE Contract Number:
- EX-77-A-29-1060
- OSTI ID:
- 5556335
- Report Number(s):
- DOE/NASA/0063-79/1; NASA-CR-159591
- Country of Publication:
- United States
- Language:
- English
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