Question

Define heat rate and steam rate. Derive a relationship between these two

Answer 1

Steam rate = kg/kWh. w. Heat rate: It is rate of heat input (Q1) required for producing unit work output (1 kW).

Answer 2

The rate at which heat is transported from the steam to the secondary fluid for a given heat exchanger is determined by the mean temperature difference between the two fluids for a constant heating area and heat transfer coefficient.

What is the heat rate?

The total amount of energy required by an electric generator or power plant to produce one kilowatt-hour (kWh) of electricity is known as the heat rate.

What is the steam rate?

The amount of steam required to create one horsepower in kgs or lbs per hour if the turbine's isentropic efficiency is 100% is known as the steam rate.

Derive a relationship between these two:

• Steam rate = Mass Flow rate of steam/Power output in kilowatt.
• Steam rate$=\frac{3600}{_{net} } (\frac{kg}{k_{w}-h_{r} } )$ or $\frac{KJ}{Kg}$.
• Heat rate is expressed as $\frac{Kj}{Kw-hr}$.
• Heat rate = Heat supplied $\times$ 3600/ heat supplied- heat rejected
• Heat rate$=\frac{3600\times Q_{1} }{W_{net} }(\frac{kj}{kw-hr})$

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