## ЕЗ/ Wind Turbine Generator Model

A full characterization test of the hybrid system’s wind generator machine has been carried out. The test was divided into two parts. In the laboratory the generator efficiency was determined for a variety of rotational speeds in the range 150[rpm] – 1100[rpm] and the characteristics of the generator efficiency n™e against the output power Pout […]

## THE SECOND-LAW APPROACH

Thermodynamics heavily dwells on a variety of phenomena which in­volve the generation of useful work (electricity for our purpose); in particular, "the maximum work that can be extracted from a given system in a given state by a process which brings it into equili­brium with its environment". That maximum work is termed the avall- ibitv […]

## THE POWER-ENGINEERING APPROACH

The power-plant engineer recognizes that new, modern fossil-firing power plants will have conversion efficiencies in the range of 33­40/., depending on the specified fossil fuel, size of plant and local environment. For some specific conditions, it may be 33X, i. e., 0. 33 kWh(e) net electricity will be produced per 1 kWh(t) of fuel <Lo. […]

## THE FIRST-LAW APPROACH

With this approach one may try to define the amount of solar kilo­Watt-hours electricity contribution as follows, using the numerical values of the above example : Solar electricity = Wou« x 0/(0 + Wirl) = 45.516 x 10b kWh(e) The ratio 0/(0 * Wlr)) will thus represent the solar fraction, i. e., the part of […]

## A NUMERICAL EXAMPLE

For a conventional fossil-fired power plant, one of the major pei— formance indicators is the percentage of conversion, or fuel utili­zation efficiency, e. g., in a typical modern Rankine-cycle power plant, 37% of the heat of combustion of the fuel used (the "low heating value" — the enthalpy of combustion for gaseous product water) appears […]

## THE SECOND-LAW AND POWER-ENGINEERING ANALYSIS OF. HYBRID (FOSSIL-ASSISTED) SOLAR-THERMAL POWER PLANTS

Aharon S. Roy Dept, of Chemical Engineering, Ben-Gurion Univ. of the Negev, Beer-Sheva, ISRAEL ABSTRACT When a solar power plant is assisted by fossil fuel-firing, the question is often legitimately asked as to the actual magnitude of the contribution of the solar resource vs. that of the fossil, or as to the real savings in […]

## RECENT SOLAR THERMAL DEVELOPMENTS

Luz International Corp., developer of solar energy generating stations on the mainland, has been contracted by the state government to conduct a feasibility study for the islands. Site visits have been made and discussions held with local utilities. Luz will examine facility sizes from a 1-30 MW range, and possibly up to 200 MW capacity. […]

## POTENTIAL CONCENTRATING SOLAR THERMAL SITES

Solar insolation data have been recorded in Hawaii from as early as 1932, at 140 observation stations over various periods. Almost all of the data were collected by the sugar industry, which maintains a network of roughly 100 stations located on the four sugarcane-growing islands, for the evaluation of solar energy available for photosynthesis. The […]