Showing papers by "Noam Lior published in 1984"
TL;DR: In this article, a hybrid steam Rankine cycle was designed to drive a conventional open-compressor chiller, but is equally applicable to power generation, where steam is generated by the use of solar energy collected at about 100°C, and is then superheated to about 600°C in a fossil fuel fired superheater.
47 citations
TL;DR: In this paper, a solar power/cooling system based on a hybrid steam Rankine cycle is presented, and a sensitivity analysis of the system's performance to the size and type of its components is performed by a transient (hourly) computer simulation over the month of August in two representative climatic regions (Washington, D.C. and Phoenix, Ariz.).
Abstract: The subject of this analysis is a solar power/cooling system based on a novel hybrid steam Rankine cycle. Steam is generated by the use of solar energy collected at about 100/sup 0/C, and it is then superheated to about 600/sup 0/C in a fossil-fuel-fired superheater. The addition of about 20-26 percent of energy as fuel doubles the power cycle's efficiency as compared to organic fluid Rankine cycles operating at similar collector temperatures. A sensitivity analysis of the system's performance to the size and type of its components was performed by a transient (hourly) computer simulation over the month of August in two representative climatic regions (Washington, D.C. and Phoenix, Ariz.), and led to the description of a system configuration which provides optimal energy performance. The newly designed turbine's predicted efficiency is seen to be essentially invariant with system configuration, and has a monthly average value of about 73 percent.
24 citations
TL;DR: In this paper, a solar cooling system based on a hybrid steam Rankine cycle is presented, where steam is generated by the use of solar energy collected at about 100/sup 0/C, and it is then superheated to about 600/sup 1/C in a fossil-fuel-fired superheater.
Abstract: The subject of this analysis is a solar cooling system based on a novel hybrid steam Rankine cycle. Steam is generated by the use of solar energy collected at about 100/sup 0/C, and it is then superheated to about 600/sup 0/C in a fossil-fuel-fired superheater. The addition of about 20-26 percent of fuel doubles the power cycle's efficiencyas compared to organic Rankine cycles operating at similar collector temperatures. A comprehensive computer program was developed to analyze the operation and performance of the entire power/cooling system. Transient simulation was performed on an hourly basis over a cooling season in two representative climatic regions (Washington, D.C. and Phoenix, Ariz.). One of the conclusions is that the seasonal system COP is 0.82 for the design configuration and that the use of watercooled condensers and flat-plate collectors of higher efficiency increases this value to 1.35.
22 citations
TL;DR: In this paper, a thermal and life cycle analysis was conducted to compare two types of solar service hot water systems: 1) the straight-through system with the water driven by the pressure of the mains through a heat exchanger in which it is heated by the warmer water in the solar-thermal storage tank, whenever demand for hot water is created.
3 citations
TL;DR: In this paper, the long-term performance and stability of a relatively large number of instruments used in the performance monitoring of a well-instrumented solar heating project is discussed.
Abstract: SYNOPSIS In an attempt to improve the quality and reliability of methods used for long-term performance evaluation of solar systems, detailed information is provided about the long-term (typically 2 years) performance and stability of a relatively large number of instruments used in the performance monitoring of a well-instrumented solar heating project. The calibration methods are also described. The instruments include resistance temperature detectors, several types of flowmeters, wattmeters, pyranometers, wind anemometers, a humidity meter, a barometer, differential temperature solar system controllers, and an automatic data acquisition system used to scan, convert and store the data. Recommendations for good instrumentation of solar systems are also provided. It was found that the critical instruments for performance evaluation, and most of the instruments overall, have performed very well over the long term, allowing thermal performance evaluation with an accuracy better than 3% with only one calibra...
1 citations