A short review on the techniques of waste heat recovery from domestic applications (original) (raw)
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Waste Heat Recovery ( Energy Efficient Technique0
This report provides the basic information about the recovery of the waste heat generated from the various chemical and industrial processes which makes the whole process economically feasible, technically efficient and environmentally acceptable. Waste heat recovery is the process of utilizing the waste heat released during various processes to provide heat for existing process as well as to provide energy for the new process.
Waste Heat Recovery Technologies: Pathway to Sustainable Energy Development
Journal of Thermal Engineering, 2020
The aim of this study was to review the significant of waste heat recovery technologies as means of achieving sustainable energy development. Most developing nations of the World are faced with the enormous release of industrial waste heat of low temperature grade to the environment. Unlike material waste that is clearly visible, waste heat can be difficult to identify and evaluate both in terms of quantity and quality. Hence, understanding the availability of waste heat, and the ability to recover it, offer great opportunity to reduce energy costs and associated environmental impacts. Utilizing low-grade energy from waste heat sources is considered to offer a significant contribution to improving overall energy efficiency in the energy-intensive industrial sectors. The concept of industrial waste heat is explained, potential sources of waste heat from industries are identified, and the technologies available for waste heat recovery are presented in this study. From the review study, it is shown that about 72% of the global primary energy consumption is lost after conversion, while 63% of the considered waste heat streams arise at a temperature below 100 °C in which electricity generation has the largest share followed by transportation and manufacturing industry. The results of this study reveals that considerable amount of waste heat can be technically and economically recovered through sustainable technologies with prospective capacity for the much desired sustainable energy development. Specifically, in-depth utilization of waste heat resources can effectively moderate the rate of depletion of the fossil fuels and sufficiently reduce toxic emissions to within acceptable limits that are compatible to the projected time of full deployment of renewable energy (RE) source.
Waste Heat Recovery and Conversion into Electricity: Current Solutions and Assessment
International Journal of Thermodynamics
The main energy consumption sectors are the residential, industry and transport. In all of them, a part of the energy consumption is not used and generally rejected as heat in the environment. This is named the waste heat. Firstly, the main way is to optimize the process to reduce the fuel consumption. Then, if there is a residual waste heat, a valorization way is to convert this heat into electricity. Some technologies are developed. The main technology is the Organic Rankine Cycle engine. Then, a new concept, named Turbosol, is based on the quasi-isothermal expansion of a water and oil mixture in a nozzle. Some piston engines are also developed, based on Stirling, Ericsson and Joule cycles. All these technologies are named externally heated engines. Some other research studies concern the thermoelectric effect and the thermo-magnetic effect. In this article, a non-exhaustive list, with description and comments on these technologies is proposed. The aim is to assess the potential of them and identify the current limits. To compare the different technologies in first law efficiency terms is not sufficient. Some new criterions are proposed. The first consideration is to assess the heat rate consumption referred to the heat rate available. To assess the quality of waste heat to power conversion, it is pertinent to evaluate the power output divided by the available heat rate. Then, because of the second law, it is pertinent to evaluate the exergy recovery ratio. These new waste heat criterions are compared to the classical first law efficiency in different cases. Then, the main current issue is to produce enough electrical power output to ensure the profitability. Some thermo-economic considerations are proposed, including the impact of a waste heat taxation.
Investigation of a low-grade industrial waste heat recovery system
Nowadays, while the energy prices are continuously growing, the dispositions which try to increase the energy efficiency are getting more and more important in all industrial areas. This is especially true for the energy-intensive industrial processes. Because of this, the producing companies pay more attention every year on suggesting and supporting projects, which aim to decrease the energy consumption of their own factory. One way of increasing the energy efficiency is to use the waste energy of the installations to redeem other energy sources.
Waste heat is the type of energy which is rejected by system after doing some work. Although, it is an important source of the energy which can be utilised in various ways to produce new energy sources. Demand for producing the electricity and new energy sources is increasing every year because of Continuous rise in population and depletion of non-renewable energy resources. Moreover, if possible to recover this waste heat by using technique of cogeneration and Trigeneration it will be helpful in keeping the environment clean because waste heat contain some harmful molecule which pollute environment. Waste heat recovery is the process to recovery the heat which is going out of the system and use this heat in space heating or generating power.
Analysis of Waste Heat Recovery by Using Alternate Fuel
The increasing demand for power has led to considerable fossil fuels burning which has in turn had an adverse impact on environment. It is seen that approximately, 30 to 40% of heat is only converted into useful mechanical work and the remaining heat is emitted into atmosphere as waste heat. Efficient use of energy and its conservation assumes even greater importance in view of the fact that one unit of energy saved at the consumption level reduces the need for fresh capacity creation by 2.5 times to 3 times. The economic development of a country is often closely linked to its consumption of energy. Although India ranks sixth in the world as far as total energy consumption is concerned, it still needs much more energy to keep pace with its development objectives. It can be seen that there is growing momentum behind energy recovery innovation among legislative leaders at the local, state and federal level. Energy recovery includes any process that converts waste material into energy. The Recovery technique reduces the amount of waste heat being emitted into the atmosphere. This paper shows the availability and possibility of waste heat from internal combustion engine using Matrix Heat Exchanger, also describe loss of exhaust heat energy as waste heat. Waste heat recovery system leaves a pathway for recycling and conserving fuel for future generations.
An Overview of Studies and Research on Waste Heat Recovery with Emphasis on Hot Gases
https://www.ijrrjournal.com/IJRR\_Vol.3\_Issue.8\_Aug2016/Abstract\_IJRR003.html, 2016
Efficient use of energy resources is one of the most sought after area of studies and research among energy and environment fields. The natural resources of fuel are depleting day by day. The use of renewable resources is considered as promising option. The recovery of waste heat from different thermal units such as boilers, internal combustion units, air conditioners etc. can save considerable amount of energy. Also it reduces thermal pollution. Various investigators have carried out investigation on the use of various waste heat recovery methods. Current review summarizes research and studies on regeneration and recovery of waste heat.
POWER GENERATION BASED ON WASTE HEAT RECOVERY
IRJET, 2023
Production of electricity from low or moderate temperatures is very difficult. To make it possible we need modern techniques. In every industry, power plants and process plants lot of low grade energy is wasted into the atmosphere. To recover this low grade energy, we propose Kalina cycle as a modern tool of thermodynamics. This Kalina cycle consists of multi component fluids as thermodynamic working fluid. Most of the heat is wasted near the boiler of the steam power plant, or at the flue gases coming out from chimney or stack. Using Kalina cycle we perform heat recovery task quite easily. Kalina cycle uses Ammonia and Water as working fluid. Using Aspen plus simulation tool the simulation work was performed and a reliable result was obtained. The Heat recovery from flue gases coming out from chimney of any industry may be studied using Aspen plus. Composition of Ammonia and Water mixture was varied from 0.5 to 0.9 mass fraction of Ammonia. Flow rate of hot gases is kept constant, assuming that there is constant burning of fuel in the boiler. Power generated in this process was tabulated and efficiency of the process is also calculated.
Industrial waste heat recovery: A systematic approach
Sustainable Energy Technologies and Assessments
Globally one third of energy consumption is attributable to the industrial sector, with up to fifty percent ultimately wasted as heat. Unlike material waste that is clearly visible, waste heat (WHE) can be difficult to identify and evaluate both in terms of quantity and quality. Hence by being able to understand the availability of waste heat energy, and the ability to recover, there is an opportunity to reduce industrial energy costs and associated environmental impacts. A waste heat energy recovery framework is developed to provide manufacturers with a four step methodology in assessing production activities in facilities, analysing the compatibility of waste heat source(s) and sink(s) in terms of exergy balance and temporal availability, selecting appropriate heat recovery technologies and decision support based on economic benefits. The economic opportunity for industrial energy recovery is demonstrated in an industrial case study. The applicability of the framework for wider industrial application is discussed.