Performance Evaluation of Two Medium-Grade Power Generation Systems with CO2 Based Transcritical Rankine Cycle (CTRC)
DOI:
https://doi.org/10.13052/dgaej2156-3306.3522Keywords:
CO2 – Transcritical rankine cycle, multiple waste heat, utiliza- tion rate, exergy destruction.Abstract
As CO2 is emerging as an environment friendly working fluid its application
in high temperature engine’s waste heat recovery systems is found to be
more suitable than other hydrocarbons. This paper presents a performance
comparison of two systems based on transcritical Rankine cycle using CO2
as working fluid. A heavy-duty truck is opted for analysis in which coolant
is used to preheat CO2 and further the engine exhaust is used to transfer
the heat to main heater. The System-1 and System-2 having single and dual
loop based transcritical Rankine cycle are analysed. The independent param-
eters taken for the investigative analysis are turbine inlet temperature (TIT),
pressure ratio and effectiveness of heat exchangers. Comparison results show
that System-2 is producing 11.8 kW more power than system-1 at 12 MPa
pressure ratio and at 489◦C TIT. However, under same conditions, system-1 is
having 16.88% of thermal efficiency which is higher than system-2 by around
3%. Further, the Engine coolant utilization rates when compared are nearly
same in both the systems, the exhaust gas utilization rate came out higher
for System-2. In respect of exergy destruction, system-1 shows maximum
destruction in regenerator and System-2 in heater-2.
Downloads
References
Tchanche B.F., Lambrinos G., Frangoudakis A., Papadakis G. Low-
grade heat conversion into power using organic Rankine cycles –
a review of various applications. Renew Sustain Energy 2011;
(8):3963–3979.
Wang J., Zhao P., Niu X., Dai Y. Parametric analysis of a new combined
cooling, heating and power system with transcritical CO2 driven by solar
energy. Applied Energy 2012; 94:58–64.
Bae S.J., Ahn Y., Lee J., Lee J.I., Various supercritical carbon dioxide
cycle layouts study for molten carbonate fuel cell application. J Power
Sources 2014; 270:608–618.
Ahmadi M.H., Mehrpooya M., Pourfayaz F. Exergoeconomic analysis
and multi objective optimization of performance of a Carbon dioxide
power cycle driven by geothermal energy with liquefied natural gas as
its heat sink. Energ Convers Manage 2016; 119:422–434.
Lisheng P., Bing L., Yuan Y., Weixiu S., Xiaolin W. Theoretical inves-
tigation on a novel CO2 transcritical power cycle using solar energy.
Energy Procedia 2019; 158:5130–5137.
Ge Y., Li L., Luo X., Tassou S A. Performance evaluation of a low-grade
power generation system with CO2 transcritical power cycles. Applied
Energy 2018; 227:220–230.
Yang F., Dong X., Zhang H., Wang Z., Yang K., Zhang J., et al.
Performance analysis of waste heat recovery with a dual loop organic
Rankine cycle (ORC) system for diesel engine under various operating
conditions. Energ Convers Manage 2014; 80:243–255.
Song J., Gu C. Parametric analysis of a dual loop Organic Rankine Cycle
(ORC) system for engine waste heat recovery. Energ Convers Manage
; 105:995–1005.
Huanga G., Shua G., Tiana H., Shib L., Zhugec W., Zhanga J., Atika
M.A.R. Development and experimental study of a supercritical CO2
axial turbine applied for engine waste heat recovery. Applied Energy
; 257:113997.
Performance Evaluation of Two Medium-Grade Power Generation Systems 135
Uusitalo A., Ameli A., Turunen-Saaresti T. Thermodynamic and turbo-
machinery design analysis of supercritical Brayton cycles for exhaust
gas heat recovery. Energy 2018; 167:60–79.
Peng L., Gequn S., Hua T. Carbon Dioxide as Working Fluids in Trans-
critical Rankine Cycle for Diesel Engine Multiple Waste Heat Recovery
in Comparison to Hydrocarbons. Journal of Thermal Science 2019;
(3):494–504.
Song J., Li X., Ren X., Gu C. Performance improvement of a preheating
supercritical CO2 (S-CO2) cycle based system for engine waste heat
recovery. Energy Conversion and Management 2018; 161:225–233.
Shu G., Li X., Tian H., Shi L., Wang X., Yu G. Design condition and
operating strategy analysis of CO2 transcritical waste heat recovery sys-
tem for engine with variable operating conditions. Energy Conversion
and Management2017; 142:188–199.
Shi L., Shu G., Tian H., Huang G., Chang L., Chen T., Li X. Ideal
Point Design and Operation of CO2-Based Transcritical Rankine Cycle
(CTRC) System Based on High Utilization of Engine’s Waste Heats.
Energies 2017; 10, 1692.
Guo T., Wang H., Zhang S., Yin S. Methodology of regenerator calcu-
lation for use in subcritical and transcritical organic Rankine cycle for
low-temperature heat recovery. International Conference on Electrical
and Control Engineering 2010; 10.1109/iCECE.2010.947.
Baheta A.T., Hailegiorgis S.M., Oumer A.N., Sulaiman S.A.B., Perfor-
mance analysis of Transcritical Carbon Dioxide Rankine Cycle with
Regenerator. MATEC Web of Conferences, 2018; 225: 05020.
Harby K., Hydrocarbons and their mixtures as alternatives to envi-
ronmental unfriendly halogenated refrigerants: An updated overview.
Renewable & Sustainable Energy Reviews, 2017; 73: 1247–1264.
Dai X., Shi L., An Q., Qian W., Screening of hydrocarbons as supercrit-
ical ORCs working fluids by thermal stability. Energy Conversion and
Management, 2016, 126: 632–637.
Liu P., Shu G., Wang X., Yu Z., Alkanes based two-stage expansion
with interheating Organic Rankine cycle for multi-waste heat recovery
of truck diesel engine. Energy 2018; 147: 337–350.
Vaja I., Gambarotta A., Internal combustion engine (ICE) bottoming
with organic Rankine cycles (ORC). Energy 2010; 35:1084–1093.
Sharma, M. and Singh, O., 2017. Investigations for performance
enhancement of dual pressure HRSG in gas/steam combined cycle
K. Sajwan et al.
power plants. International Journal of Ambient Energy, 38(4),
pp. 339–346.
Shukla, A.K., Sharma, A., Sharma, M. and Nandan, G., 2019. Ther-
modynamic investigation of solar energy-based triple combined power
cycle. Energy Sources, Part A: Recovery, Utilization, and Environmental
Effects, 41(10), pp. 1161–1179.
Shukla, A.K., Sharma, A., Sharma, M. and Mishra, S., 2018. Perfor-
mance improvement of simple gas turbine cycle with vapor compression
inlet air cooling. Materials Today: Proceedings, 5(9), pp. 19172–19180.
