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Chapter 9: Problem 4

Mention two benefits of a reheat cycle.

Short Answer

Expert verified
Increased efficiency and reduced moisture content are two benefits of a reheat cycle.

Step by step solution

01

Understanding the Context of a Reheat Cycle

A reheat cycle is commonly used in power plants to enhance the efficiency and performance of steam turbines. It involves reheating the steam after it has expanded partially in the turbine, allowing it to expand again and generate additional work.
02

Benefit 1: Increased Efficiency

By reheating the steam, the cycle increases the average temperature at which heat is added to the steam. This helps in increasing the thermal efficiency of the cycle, as the efficiency of a cycle depends on the range of temperatures over which it operates.
03

Benefit 2: Reduced Moisture Content

Reheating the steam before it enters the turbine for further expansion helps in reducing the moisture content of the steam. Lower moisture content minimizes the erosion of turbine blades, leading to longer turbine life and more consistent performance.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Steam Turbines
Steam turbines play a crucial role in power plants by converting thermal energy from steam into mechanical work. When steam expands within a turbine, it spins the blades attached to a shaft, which then turns a generator to produce electricity. This process is efficient and cost-effective for power generation.
  • In a reheat cycle, steam is partially expanded in the turbine and then sent back to the boiler to be reheated.
  • The reheated steam returns to the turbine for further expansion, increasing overall work output.
This method improves the performance of the turbine and results in higher efficiency without the need for significantly higher temperatures. Understanding how steam turbines work is essential for grasping the benefits of the reheat cycle.
Thermal Efficiency
Thermal efficiency is a measure of how well a power cycle converts heat into work. In steam cycles, efficiency is influenced by the temperature range through which the system operates. The reheat cycle enhances thermal efficiency by
  • increasing the average temperature at which heat is added, and
  • allowing steam to do more work over multiple phases.
This increase in efficiency is achieved without raising the maximum temperature of the cycle, making it a preferred method for modern power plants. Thermal efficiency is critical because it determines how much fuel is required to generate a specific amount of electricity, ultimately influencing the overall cost and environmental impact of power generation.
Power Plants
Power plants are facilities that generate electricity on a large scale by utilizing various energy sources. A key component in many power plants is the steam cycle, which includes the use of boilers, steam turbines, and condensers. The reheat cycle improves power plant efficiency by reducing the moisture content in steam, minimizing turbine blade erosion, and prolonging equipment longevity.
  • This leads to decreased maintenance costs and better reliability.
  • Power plants using reheat cycles can generate more power with the same amount of fuel, making them more economical and sustainable.
Reheat cycles are an integral part of today's power plants, helping to meet the growing demand for electricity while optimizing resource use.

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Most popular questions from this chapter

A low-temperature power plant operates with R-410a maintaining \(-20^{\circ} \mathrm{C}\) in the condenser, a high pressure of 3 MPa with superheat to \(80^{\circ} \mathrm{C}\). There is one open FWH operating at \(800 \mathrm{kPa}\) with an exit as saturated liquid at \(0^{\circ} \mathrm{C}\). Find the extraction fraction of the flow out of the turbine and the turbine work per unit mass flowing through the boiler.

A Rankine cycle flows \(5 \mathrm{~kg} / \mathrm{s}\) ammonia at \(2 \mathrm{MPa}\), \(140^{\circ} \mathrm{C}\) to the turbine, which has an extraction point at \(800 \mathrm{kPa}\). The condenser is at \(-20^{\circ} \mathrm{C},\) and a closed FWH has an exit state (3) at the temperature of the condensing extraction flow and it has a drip pump. The source for the boiler is at constant \(180^{\circ} \mathrm{C}\). Find the extraction flow rate and state 4 into the boiler.

A Rankine cycle with \(\mathrm{R}-410 \mathrm{a}\) has the boiler at 600 psia superheating to \(340 \mathrm{~F}\), and the condenser operates at 100 psia. Find all four energy transfers and the cycle efficiency.

Consider a solar-energy-powered ideal Rankine cycle that uses water as the working fluid. Saturated vapor leaves the solar collector at 150 psia, and the condenser pressure is 0.95 psia. Determine the thermal efficiency of this cycle.

The effect of evaporator temperature on the COP of a heat pump is to be studied. Consider an ideal cycle with \(\mathrm{R}-134 \mathrm{a}\) as the working fluid and a condenser temperature of \(40^{\circ} \mathrm{C}\). Plot a curve for the COP versus the evaporator temperature for temperatures from +15 to \(-25^{\circ} \mathrm{C}\).
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