Thermal Analysis Of Solar Power Plants

Thermal solar power plants are similar to the conventional ones with the exception that a field of concentrating solar collectors replaces the conventional steam boiler. In hybrid plants, a conventional boiler is also present, operating on conventional fuel, usually natural gas, whenever there is a need. Therefore, the thermal analysis of solar power plants is similar to that of any other plant and the same thermodynamic relations are applied. The analysis is greatly facilitated by drafting the cycle on a T-s diagram. In these cases, the inefficiencies of pump and steam turbine should be considered. In this section, the equations of the basic Rankine power cycle are given and two of the more practical cycles, the reheat and the regenerative Rankine cycles, are analyzed through two examples. To solve the problems of these cycles, steam tables are required. Alternatively, the curve fits shown in Appendix 5 can be used. The problems that follow were solved by using steam tables.

The basic Rankine cycle is shown in Figure 10.9a and its T-s diagram in Figure 10.9b.

Boiler

3

Pump

Condenser

Condenser

Turbine

FIGURE 10.9 Basic Rankine power plant cycle. (a) Basic Rankine cycle schematic. (b) T-s diagram.

FIGURE 10.9 Basic Rankine power plant cycle. (a) Basic Rankine cycle schematic. (b) T-s diagram.

As can be seen in Figure 10.9, the actual pumping process is 1-2' and the actual turbine expansion process is 3-4'. The various parameters are as follows: Turbine efficiency,

Pump efficiency,

Net work output,

Heat input,

Pump work,

npump

Net Analysis Solar Power Plant
(a)

FIGURE 10.10 Reheat Rankine power plant cycle. (a) Reheat Rankine cycle schematic. (b) T-s diagram.

FIGURE 10.10 Reheat Rankine power plant cycle. (a) Reheat Rankine cycle schematic. (b) T-s diagram.

Cycle efficiency,

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

Get My Free Ebook


Post a comment