Performance of micro CHP unit based on SI engine with quantitative-qualitative load control
Treść / Zawartość
The paper presents data resulting by the preliminary experimental tests performed on a micro CHP (combined heat and power) 7 kWel unit. The engine load has been controlled by throttle position (quantitatively) or/and the value of air excess ratio (qualitatively) QQLC. By this way the engine efficiency can be improved in the range of partial loads by reducing the exergy losses during the inlet stroke. During the tests engine has been powered with LPG fuel. The engine performance together with environmental impact has been studied in this paper. Used method shows that despite the reduction of the load from 5.6 kW to 4.7 kW while burning the lean mixture, the efficiency of electricity generation increased slightly. The efficiency grew by approx. 1.41 percentage point comparing with the results obtained for almost constant load but obtained by burning the lean mixture (λ = 1.3), followed by increased throttling and combustion of the stoichiometric mixture.
Bibliogr. 7 poz., 1 fot. kolor., wykr.
- Institute of Thermal Technology, Silesian University of Technology, firstname.lastname@example.org
- Institute of Thermal Technology, Silesian University of Technology, email@example.com
- Institute of Thermal Technology, Silesian University of Technology, firstname.lastname@example.org
-  ROLLERT, K.E. The underlying factors in the uptake of electricity demand response: The case of Poland. Utilities Policy. 2018, 54, 11-21.
-  https://www.cire.pl/item,149871,1,0,0,0,0,0,zuzycie-energiielektrycznej-w-polsce-rosnie.html (access 07.03.2019).
-  GAWLIK, L., SZURLEJ, A., WYRWA, A. The impact of the long-term EU target for renewables on the structure of electricity production in Poland. Energy. 2015, 92(2), 172-178.
-  DARZI, M., JOHNSON, D., ULISHNEY, C., OLIVER, D. Gaseous fuels variation effects on first and second law analyses of a small direct injection engine for micro-CHP systems. Energy Conversion and Management. 2019, 184, 609-625.
-  SPOLETINI, E. Economic analysis and technical issues of low temperature PCM thermal storage combi. Energy Procedia. Vol. 2016, 101, 1151-1158.
-  PRZYBYLA, G., POSTRZEDNIK. S., ZMUDKA, Z. The impact of air-fuel mixture composition on SI engine performance during natural gas and producer gas combustion. Scientific conference on automotive vehicles and combustion engines (KONMOT 2016), IOP Conference Series-Materials Science and Engineering. 2016, 148. Article Number: UNSP 012082.
-  NADALETI, W.C., PRZYBYLA, G. Emissions and performance of a spark-ignition gas engine generator operating with hydrogen-rich syngas, methane and biogas blends for application in southern Brazilian rice industries. Energy. 2018, 154, 38-51.