Selection of refrigerants for a modified organic Rankine cycle

Kajurek, Jakub; Rusowicz, А.; Grzebielec, Andrzej; Bujalski, Wojciech; Futyma, Kamil; Rudowicz, Zbigniew

doi:10.1016/j.energy.2018.11.024

Cited by 48 publications

(17 citation statements)

References 28 publications

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“…Overall efficiency depends on the efficiency and effectiveness of individual system components (Kajurek et al, 2019):  pump efficiency;  isentropic turbine efficiency;  mechanical turbine efficiency;  generator efficiency;  condenser thermal efficiency;  evaporator thermal efficiency;  regenerator thermal efficiency. Efficiency also depends on the amount of additional energy needed to pump the cooling and heating medium through the exchangers (these are pumps or fans).…”

Section: The Orc Device Efficiencymentioning

confidence: 99%

“…In previous studies (Kajurek et al, 2017(Kajurek et al, , 2019 it was determined which working fluid is best to be used in ORC systems. From the point of energy efficiency view, ammonia proved to be unrivaled, however, due to the fact that the temperature of the critical point for ammonia is 132.4 °C, it cannot be used in systems where a higher evaporator temperature in the ORC system is expected.…”

Section: Introductionmentioning

confidence: 99%

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Correct Selection of the Orc System Parameters for the Exhaust Gases Heat Source

Grzebielec

Rusowicz

Ziąbka

2020

International Conference “Environmental Engineering”

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Contrary to appearances, ORC (Organic Rankine Cycle) systems should not be selected for the highest available temperature of the upper heat source. This approach allows, of course, to achieve the highest energy efficiency, but this happens at the expense of the electrical power obtained. This solution would be good for an infinite heat source. In practice, there is always a finite heat source power. Therefore, the analysis should take into account other aspects than just maximum efficiency. The article presents a method of selecting ORC system parameters for a heat source in the form of waste gases, enabling the highest electrical power to be obtained. The analysis shows that even a significant reduction in the evaporation temperature of the working medium in the ORC system compared to the source temperature is beneficial for the profitability of investing in an ORC system. The analysis showed that for flue gases with temperatures of 300, 400, 500 and 600 °C, the best evaporating temperatures of the working medium in the ORC system are 145 °C, 185 °C, 214 °C and 250 °C, respectively. The highest level of generated electricity is obtained for these temperatures.

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Section: The Orc Device Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Correct Selection of the Orc System Parameters for the Exhaust Gases Heat Source

Grzebielec

Rusowicz

Ziąbka

2020

International Conference “Environmental Engineering”

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“…In Poland, thermo-modernization programs are very well developed, aimed at reducing energy consumption, and thus reducing air pollution. Unfortunately, not everything has been achieved yet (Owczarek & Baryłka, 2019;Rusowicz & Ruciński, 2011;Kajurek et al, 2019). While the quality of outdoor air in the current legal system in Poland is difficult to improve, it becomes very important to maintain good indoor air quality.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Possibilities of Improving Environmental Conditions in Lecture Halls Using Mechanical Ventilation

Grzebielec

Szelągowski

Bruzi

2020

International Conference “Environmental Engineering”

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Didactic classes are conducted in lecture halls usually adapted from the technical side to present content. Audiovisual and sound systems are installed. Unfortunately, in many cases, classrooms are designed from the point of view of air conditioning and ventilation, just like office rooms. As a result, during classes, even in rooms where air conditioning occurs, the conditions change so unfavourably that both teacher and students experience discomfort. The work analyzes the change in temperature, CO2 concentration, PM2.5 concentration and relative humidity in the room, where heat gains from people and equipment as well as moisture gains exceed design values. The work uses a channel-free Respireco recuperator with cyclic operation. First, the thermodynamic properties of the recuperator itself were checked, and then it was tested in a selected Polish primary school. The results show that this type of recuperators are able to provide correct indoor climatic conditions in lecture halls. The use of mechanical ventilation using a recuperator with a ceramic heat recovery caused the CO2 concentration in the room to drop by 50% during classes. However, PM2.5 concentration was maintained at a level three times lower than in a room without mechanical ventilation. It should therefore be concluded that the use of mechanical ventilation with recuperation not only reduces heating costs but also significantly improves air quality.

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“…One efficient way to recover energy from waste heat sources is the organic Rankine cycle (ORC). When recovering energy from low-grade heat sources, an ORC system is more efficient than a conventional Rankine cycle [9,10]; this is because the ORC system uses an organic working fluid (WF) with a low boiling point [11]. When recovering energy from a cold source, the ORC system is also an efficient option because the organic WF has a low freezing point and a low boiling point.…”

Section: Introductionmentioning

confidence: 99%

Optimization of an Organic Rankine Cycle System for an LNG-Powered Ship

Koo

Choi

et al. 2019

Energies

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Recovering energy from waste energy sources is an important issue as environmental pollution and the energy crisis become serious. In the same context, recovering liquefied natural gas (LNG) cold energy from an LNG-powered ship is also important in terms of energy savings. To this end, this study investigated a novel solution for a LNG-powered ship to recover LNG cold energy. Six different organic Rankine cycle (ORC) systems (three for high-pressure dual-fuel engines and three for medium-pressure dual-fuel engines) were proposed and optimized; nine different working fluids were investigated; annualized costs for installing proposed ORC systems were estimated based on the optimization results. In addition, a sensitivity analysis was performed to identify the effect of uncertainties on the performance of the ORC systems. As a result, the ORC system for the medium-pressure engines with direct expansion, multi-condensation levels, and a high evaporation temperature exhibited the best performance in terms of exergy efficiency, net power output and actual annualized cost. These results demonstrate the possibility of replacing a typical LNG supply system with an ORC system.

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Selection of refrigerants for a modified organic Rankine cycle

Cited by 48 publications

References 28 publications

Correct Selection of the Orc System Parameters for the Exhaust Gases Heat Source

Correct Selection of the Orc System Parameters for the Exhaust Gases Heat Source

Analysis of the Possibilities of Improving Environmental Conditions in Lecture Halls Using Mechanical Ventilation

Optimization of an Organic Rankine Cycle System for an LNG-Powered Ship

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