China
Africa
Explore chapters and articles related to this topic
Gas Power Cycles
Published in Kavati Venkateswarlu, Engineering Thermodynamics, 2020
Heat engines operating on gas cycles are of two types: internal combustion and external combustion engines. They may be cyclic or noncyclic. The reciprocating internal combustion engines in which combustion takes place inside the cylinder are noncyclic heat engines. Spark ignition and compression ignition engines belong to this category. Gas turbines are rotary engines in which combustion is either inside (open cycle) or outside (closed cycle) and are termed either internal combustion or external combustion engines. Spark-ignition, compression-ignition, and gas turbine engines operate on gas cycles. In external combustion engines, combustion takes place outside the cylinder as opposed to that of spark ignition and compression ignition engines. External combustion engines present several benefits over the internal combustion engines. Various fuels (even cheaper) can be burned in external combustion engines; complete combustion takes place due to the time available for combustion is more; and in addition to these advantages, since they operate on a closed cycle, the working fluid with best features can be utilized. For example, hydrogen and helium are the two prominent gases that are used in closed-cycle gas turbine plants used in nuclear power plants for the electrical power generation.
Stirling Engine Solar Power Systems
Published in Robert K. McMordie, Mitchel C. Brown, Robert S. Stoughton, Solar Energy Fundamentals, 2021
Robert K. McMordie, Mitchel C. Brown, Robert S. Stoughton
A Stirling engine is similar to a Carnot. It is an external combustion engine but unlike the Carnot engine the Stirling engine employs heat regeneration within the engine’s cylinder. The regeneration device absorbs heat from the gas that is within the engine cylinder during part of the cycle, and rejects heat to the gas at another part of the cycle. The Stirling engine has the same efficiency as a Carnot engine. (See the appendix for the derivation of the Stirling engine efficiency). The Stirling engine was first suggested by Reverend Robert Stirling (1797-1878).
Biomass Conversion Process for Energy Recovery
Published in D. Yogi Goswami, Frank Kreith, Energy Conversion, 2017
Mark M. Wright, Robert C. Brown
The Stirling cycle employs heat from an external combustion engine to raise the temperature of an internal fluid undergoing a thermodynamic cycle [14]. The internal fluid never comes in contact with the combustion fuel, which lowers maintenance costs and pollution emissions. This arrangement also increases the tolerance to contaminants, which makes this cycle attractive for use with “dirty” fuels.
Numerical prediction of performance of a low-temperature-differential gamma-type Stirling engine
Published in Numerical Heat Transfer, Part A: Applications, 2018
Chin-Hsiang Cheng, Quynh-Trang Le, Jhen-Syuan Huang
Stirling engines that were invented by Robert Stirling in 1816 are a type of external combustion engines. Based on according to arrangement, the number of cylinders, and the number of piston and displacer in each engine, traditional Stirling engines can be classified into three typical types including the alpha-type, beta-type, and gamma-type. These engines can be operated under a low-temperature difference between heat source and sink, and with flexible and diverse heat sources such as geothermal energy, solar energy, and industrial waste resources [1]. Besides, simple construction, quiet, high efficiency, and safe operation are merits of Stirling engines. As a result, Stirling engines are a potential candidate to attenuate the global warming and reduce dependence of human being on fossil energy. Among three types of Stirling engine, gamma-type Stirling engines are the most common configurations to exploit low-temperature heat sources.
Enhancing and multi-objective optimising of the performance of Stirling engine using third-order thermodynamic analysis
Published in International Journal of Ambient Energy, 2018
Mazdak Hooshang, Somayeh Toghyani, Alibakhsh Kasaeian, Reza Askari Moghadam, Mohammad Hossein Ahmadi
Stirling engine is a kind of an external combustion engine that produces mechanical or electrical output power, by receiving and rejecting heat (Batmaz and Üstün 2008; Timoumi, Tlili, and Nasrallah 2007; Timoumi et al., ‘Design and Performance Optimization’ 2008, ‘Performance Optimization of Stirling’ 2008; Tlili 2012a; Tlili et al., ‘Analysis and Design Consideration’ 2008, ‘Thermodynamic Analysis of the Stirling Heat Engine’ 2008; Ahmadi, Ahmadi, and Dehghani 2013). At higher temperatures, heat enters in the engine and a section of its exergy turns into mechanical or electrical output power while the remainder of the heat is rejected at lower temperatures. Stirling engine has two hot and cold chambers which are called as the expansion and the compression spaces in where the working fluid at relatively high pressure is placed. The fluctuating in the space of the two chambers causes receiving thermal energy from a heat source, creating mechanical output power and releasing heat in a thermal rejecter.