W

= power output, in hp

Similarly, in terms of kW, it is expressed as:

3,413

* At lower pressures, the pump work is negligible, but at higher pressures, it may play a somewhat larger role. In a 100 MW regeneration cycle, for example, the total pump work per unit of mass passing through the first stage turbine is 3.73 Btu/lbm (8.68 kJ/kg) compared to turbine work output of 422.5 Btu/lbm (982.7 kJ/kg) and heat input of 1134.4 Btu/lbm (2,638.6 kJ/kg) into the steam generator. Therefore, the pump work is 0.3% of the heat input and 0.9% of the turbine work.

The theoretical water rate (TWR), or steam rate (TSR), is the amount of steam required by the turbine, at ideal expansion, to produce a given unit of work output. It is expressed, in English system units (refer to conversion tables for SI unit equivalents), as:

2,545

Figure 11-31 provides a series of diagrams showing the effect of changes in steam temperature, steam pressure, and exhaust pressure on ideal Rankine Cycle performance.

Guide to Alternative Fuels

Guide to Alternative Fuels

Your Alternative Fuel Solution for Saving Money, Reducing Oil Dependency, and Helping the Planet. Ethanol is an alternative to gasoline. The use of ethanol has been demonstrated to reduce greenhouse emissions slightly as compared to gasoline. Through this ebook, you are going to learn what you will need to know why choosing an alternative fuel may benefit you and your future.

Get My Free Ebook


Post a comment