Comparison of low temperature waste heat recovery methods

Varga, Zoltán; Palotai, Balázs

doi:10.1016/j.energy.2017.07.003

Cited by 48 publications

(17 citation statements)

References 26 publications

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“…However, it should be underlined that typical processes aiming at optimization of the performance of boilers for combusting liquid fluids cover only heat recovery, and to a much lesser extent they focus on heat recovery combined with combustion gas cleaning. Examples of solutions are included in literature reviews by Patterson [28], Johuary [29] and Varga [30]. It should be emphasized that none the solutions and methods described in the above publications combine the improvement of energy efficiency of the heat source with simultaneous removal of pollutants from exhaust gases, which is a feature of the system developed by the authors of this manuscript.…”

Section: Combustion Gas Cleaning and Heat Recovery From Combustion Ofmentioning

confidence: 99%

Innovative System for Heat Recovery and Combustion Gas Cleaning

et al. 2019

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The Polish as well as the global energy economy, including in particular heat generation, is to a great extent based on facilities for the combustion of liquid and gaseous fuels. Globally, a considerable part, and in Poland a vast majority of these facilities are much worn out, and, consequently, they work with low efficiency producing considerable amounts of pollutants, which have a very negative impact on the environment. Therefore, it is of crucial importance to develop innovative solutions that enhance the efficiency of fuel combustion and at the same time reduce emission of pollutants. The paper presents a solution which renders it possible to increase the efficiency of fuel conversion by heating up substrates of combustion processes, heat recovery from combustion gases as a result of their cooling and water vapor condensation and which contributes to a reduction of pollution. The solution brings about significant fuel consumption savings and thus a considerable enhancement of economic and ecological efficiency of heat sources is achieved. The solution is specially dedicated to heat sources of low and medium power. The technology developed and described herein will also allow an elimination of environmental burdens caused by inefficient heat sources already in operation.

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Section: Combustion Gas Cleaning and Heat Recovery From Combustion Ofmentioning

confidence: 99%

Innovative System for Heat Recovery and Combustion Gas Cleaning

et al. 2019

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“…Nemati et al [22], and Varga et a. [30] analyzed these cycles for waste heat recovery in petrochemical sector. There are even some articles that evaluated the costs in the industrial sector of the cogeneration of Brayton Cycles with ORC [3].…”

Section: Introductionmentioning

confidence: 99%

Comparing the thermodynamic performance of organic Rankine and Kalina cycles in solar energy systems

Pinto

Mady

2020

J Braz. Soc. Mech. Sci. Eng.

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This paper reports on a comparative study of the thermodynamic performance of the organic Rankine cycle (ORC) and Kalina cycle 11 (KCS11) using solar energy for application in residential or commercial sectors. The objective was to determine the amount of power that can be produced by solar energy systems using low-quality energy sources (hot water at temperatures above 60 o C), from the viewpoints of the first and second laws of thermodynamics. Moreover, the performance impact of coupling these cycles to hybrid solar photovoltaic-thermal collector systems (PV/T) to increase the total power generation for the same surface area was analyzed. In particular, the PV/T systems were employed to increase the production of solar energy systems, as the efficiency of photovoltaic cells reduces under hot climates, such as the climate in Brazil. The results indicated that the exergy efficiency of the KCS11 is higher than that for the ORC. Nevertheless, both cycles as the bottoming cycles to PV/T collector configurations increased the total theoretical electric power generation, for the design study, in approximately 0.4 kW per unit of area.

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“…Organic Rankine Cycle (ORC) provides an alternative solution, because it uses non-conventional working fluids, mainly organic ones. These unconventional working fluids are suitable for power generation from various low-temperature heat sources [1,2], including geothermal heat [3,4] or low-temperature industrial waste heat [5]. According to the ORC World Map [6], in the middle of 2016, the number of installed major ORC units exceeded 700.…”

Section: Introductionmentioning

confidence: 99%

A Simple Method of Finding New Dry and Isentropic Working Fluids for Organic Rankine Cycle

2019

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One of the most crucial challenges of sustainable development is the use of low-temperature heat sources (60–200 °C), such as thermal solar, geothermal, biomass, or waste heat, for electricity production. Since conventional water-based thermodynamic cycles are not suitable in this temperature range or at least operate with very low efficiency, other working fluids need to be applied. Organic Rankine Cycle (ORC) uses organic working fluids, which results in higher thermal efficiency for low-temperature heat sources. Traditionally, new working fluids are found using a trial-and-error procedure through experience among chemically similar materials. This approach, however, carries a high risk of excluding the ideal working fluid. Therefore, a new method and a simple rule of thumb—based on a correlation related to molar isochoric specific heat capacity of saturated vapor states—were developed. With the application of this thumb rule, novel isentropic and dry working fluids can be found applicable for given low-temperature heat sources. Additionally, the importance of molar quantities—usually ignored by energy engineers—was demonstrated.

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Comparison of low temperature waste heat recovery methods

Cited by 48 publications

References 26 publications

Innovative System for Heat Recovery and Combustion Gas Cleaning

Innovative System for Heat Recovery and Combustion Gas Cleaning

Comparing the thermodynamic performance of organic Rankine and Kalina cycles in solar energy systems

A Simple Method of Finding New Dry and Isentropic Working Fluids for Organic Rankine Cycle

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