1. What is Rankine Cycle Efficiency?

Definition: This calculator determines the thermal efficiency of a Rankine cycle, which is the most common thermodynamic cycle used in power plants.

Purpose: It helps engineers and students evaluate the performance of steam power plants and other Rankine cycle systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \eta \) — Thermal efficiency (%)
• \( W_{net} \) — Net work output (Joules, J)
• \( Q_{in} \) — Heat input to the system (Joules, J)

Explanation: The efficiency is calculated as the ratio of net work output to heat input, expressed as a percentage.

3. Importance of Rankine Cycle Efficiency

Details: Higher efficiency means more work is extracted from the same amount of heat input, leading to better fuel economy and reduced operating costs.

4. Using the Calculator

Tips: Enter the net work output and heat input in joules. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical Rankine cycle efficiency?
A: Modern power plants typically achieve 30-40% efficiency, while combined cycle plants can reach 50-60%.

Q2: How do I find the net work output?
A: Net work output is the difference between turbine work and pump work (W_turbine - W_pump).

Q3: What units should I use?
A: The calculator uses joules (J) for both work and heat input. If you have other units, convert them to joules first.

Q4: Why can't efficiency reach 100%?
A: Due to the second law of thermodynamics and practical limitations like heat losses and irreversibilities.

Q5: How can I improve Rankine cycle efficiency?
A: Methods include increasing boiler pressure, adding reheat stages, or using regeneration.