Exploitation of low-temperature energy sources from cogeneration gas engines

Caf, A.; Urbancl, Danijela; Trop, Peter; Goričanec, Darko

doi:10.1016/j.energy.2015.09.119

Cited by 12 publications

(12 citation statements)

References 11 publications

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“…• It was assumed that heat losses are negligible. • An adiabatic, but non-isentropic compression process was assumed with isentropic efficiency of 0.7 [12] and 0.84 [3] and [4] for CO 2 and ammonia compressors, respectively. Mechanical efficiency was set to 0.97 for both compressors.…”

Section: Simulationsmentioning

confidence: 99%

“…Goričanec et al [3] reported on exploiting low-temperature heat from the generators' cooling system within a hydro power plant. A study on the exploitation of lowtemperature energy sources from cogeneration gas engines was presented in [4]. A semi-empirical model was developed for high pressure twin compressors for the purpose of exploiting waste heat of refrigeration units [5].…”

Section: Introductionmentioning

confidence: 99%

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The Comparison between Two High-Temperature Heat-Pumps for the Production of Sanitary Water

2018

SV-JME

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High-temperature heat-pumps are devices that exploit low-temperature heat sources for the production of hot water at high temperatures. This paper presents a comparison between two high temperature heat-pumps for the production of hot sanitary water of temperatures between 65 °C and 85 °C. A high-temperature heat-pump that uses ammonia as a refrigerant and transcritical heat-pump that uses carbon dioxide as a refrigerant were compared in terms of coefficient of performance. Theoretical calculations were based on the REFPROP property method within Aspen Plus software. The simulations showed that the ammonia high-temperature heat-pump outperforms the transcritical heat-pump in terms of coefficient of performance within the evaporation temperature range between -20 °C and 20 °C. Highlights• Paper presents modelling two high-temperature heat-pumps using REFPROP property method. • Two refrigerants were compared, ammonia and CO2 in terms of COP. • A double stage ammonia heat-pump has a higher COP than the transcritical heat-pump. • Heat-pump technology is cheaper than the technology of transcritical heat-pumps.

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Section: Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Comparison between Two High-Temperature Heat-Pumps for the Production of Sanitary Water

2018

SV-JME

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“…The main objective of this study is to develop an innovative solution for the exploitation of excess low-temperature heat sources of hot water boilers, which are discharged with exhaust gases into the environment. The heat that would be produced with one or more cascaded high-temperature heat pumps [14,15], by exploiting low-temperature heat sources of hot water boilers, would be used for preheating the return water of the high-temperature heating system in industry or district heating systems.…”

Section: Introductionmentioning

confidence: 99%

The Exploitation of Low-Temperature Hot Water Boiler Sources with High-Temperature Heat Pump Integration

Goričanec

Ivanovski²,

Krope

et al. 2020

Energies

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The article presents an original and innovative technical solution for the exploitation of low-temperature excess heat from hot water boilers that use gas or liquid fuel for the needs of high-temperature heating in buildings or in industry. The primary fuel efficiency used for hot water boilers can be significantly increased by utilizing the excess low-temperature heat of flue gases that are discharged into the environment and thus also reduce CO2 emissions. Hot water systems usually operate at higher temperatures of the heating water, which is transported to the heat consumer via supply pipe, and the cooled heating water is returned to the hot water boiler via the return pipe. For the excess low-temperature heat exploitation of the flue gases from hot water boiler, it is necessary to install a condenser in the flue gas discharge pipe, where condensation of water vapour present in the flue gas heats water or a mixture of water and glycol. The heating water, which is cooled and returned from the heat consumer via the return pipe, is led to the condenser of the high-temperature heat pump, where it is preheated and then led to the hot water boiler, where it is heated to the final temperature. A computer simulation with the Aspen plus software package for the series or parallel connection of high-temperature heat pump to a hot water heating system and the economic analysis of the excess heat exploitation from the flue gases are also performed.

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“…ORC is a simple cycle with available refrigerants, flexible, and also reliable under different operation's condition . Nowadays, low‐temperature heat sources are used widely around the globe …”

Section: Introductionmentioning

confidence: 99%

“…1 Nowadays, low-temperature heat sources are used widely around the globe. 2,3 Organic fluids are considered as the promising working fluid in ORC power production systesm. Organic fluids used in ORC have lower boiling point than water due to the higher molecular weight.…”

Section: Introductionmentioning

confidence: 99%

Analysis, economical and technical enhancement of an organic Rankine cycle recovering waste heat from an exhaust gas stream

Ghoreishi

Vakilabadi

Bidi

et al. 2019

Energy Science & Engineering

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Any effort with the aim of increasing the total electrical power generation (EPG) due to the existed constraints in vessels is desired in power plants. Using Organic Rankine Cycle (ORC) for recovering waste heat of an exhausting gas is considered as an auxiliary way for improving EPG value. In this study, four ORC arrangements were first modeled for six refrigerants by EES software and the first and second laws of thermodynamics efficiency (ηI and ηII, respectively) and mass flow rate were studied for these cycles. Based on modeling results, the best arrangement was selected for each refrigerant such as; F‐type (Reference cycle+ Intermediate recuperator+ Final recuperator) for R123, H‐type (Reference cycle+ Intermediate recuperator) for R114 and n‐butane and R‐type (Reference cycle + Final recuperator) for n‐pentane, n‐heptane, and toluene. The ηI value as a technical objective function was then optimized for the above cycles by Aspen HYSYS. n‐heptane and toluene cycles were chosen due to higher first‐law efficiency value and then were studied under different source temperature condition and n‐heptane cycle showed better adaptability. Afterward, exergoeconomic was applied on n‐heptane cycle and maximum cycle pressure was chosen as a design variable for economically optimizing net final income (NFI). Finally, NFI value is increased from 423.1$/kW·h to 609.9$/kW·h about 44.2%, while the second‐law efficiency value is just decreased from 25.6% to 20.6% about 5%.

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Exploitation of low-temperature energy sources from cogeneration gas engines

Cited by 12 publications

References 11 publications

The Comparison between Two High-Temperature Heat-Pumps for the Production of Sanitary Water

The Comparison between Two High-Temperature Heat-Pumps for the Production of Sanitary Water

The Exploitation of Low-Temperature Hot Water Boiler Sources with High-Temperature Heat Pump Integration

Analysis, economical and technical enhancement of an organic Rankine cycle recovering waste heat from an exhaust gas stream

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