Research Papers: Energy Systems Analysis

Thermodynamic and Economic Analysis of the Production of Electricity, Heat, and Cold in the Combined Heat and Power Unit With the Absorption Chillers

[+] Author and Article Information
Marcin Szega

Institute of Thermal Technology,
Silesian University of Technology,
Konarskiego 22, Gliwice 44-100, Poland
e-mail: marcin.szega@polsl.pl

Piotr Żymełka

Research and Development Department,
EDF Polska S.A.,
Podmiejska 1, Rybnik 44-207, Poland
e-mail: piotr.zymelka@edf.pl

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received November 14, 2016; final manuscript received July 21, 2017; published online November 9, 2017. Assoc. Editor: Luis Serra.

J. Energy Resour. Technol 140(5), 052002 (Nov 09, 2017) (13 pages) Paper No: JERT-16-1459; doi: 10.1115/1.4037369 History: Received November 14, 2016; Revised July 21, 2017

This paper presents the approach of thermoeconomic analysis of centralized cold generation in trigeneration system integrated with steam-powered absorption chillers (ACs). The analysis was conducted for real back-pressure combined heat and power (CHP) unit BC-50 and single-effect absorption refrigerators using water and lithium bromide as the working fluids. It has been assumed that the heating medium supplied to the chiller generator is technological steam from the existing steam bleeding. The calculations take into account changes of energy demand for heating and cooling for each month of the year. Mathematical simulation models of cogeneration and trigeneration systems have been developed with the commercial program for power plant simulation EBSILON Professional. System effects of heat and electricity cogeneration and cogeneration with additional cold production have been calculated compared to separate production of heat, electricity, and cold (replaced heating plant and power unit). The effect of trigeneration has been assessed quantitatively by the coefficient of the increasing cogeneration effects, which has been calculated as a ratio of chemical energy savings of fuels to the demand for heat by the consumers in the cases of trigeneration and cogeneration. This paper includes also analysis of economic effectiveness of a trigeneration system with ACs for cold agent production. The results of economic calculations show that an acceptable payback period of approximately 13 yr for a CHP and absorption system may be achieved. Discounted payback (DPB) is equal to the half of assumed operating time of the system. Sensitivity analysis shows that the most important impact on profitability is the selling price of cold and the purchase of fuel—hard coal.

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Grahic Jump Location
Fig. 1

Centralized trigeneration system: Eel—electricity production, Qc—cold production, Qh—heat production, Ech—chemical energy of the fuel consumed in the CHP unit, AC—absorption chiller, B—boiler, CC—cold consumer, CT—cooling tower, D + FWT—deaerator with feed-water tank, DH—district heating, DHE—district heat exchangers, G—generator, HP—high-pressure regeneration, LP—low-pressure regeneration, P—pump, and ST—steam turbine

Grahic Jump Location
Fig. 2

Decentralized trigeneration system with cold production outside the CHP plant: Eel—electricity production, Qc1,Qc2—cold production, Qh—heat production, Ech—chemical energyof the fuel consumed in the CHP unit, AC1, AC2—absorption chillers, B—boiler, CC1, CC2—cold consumers, CT1, CT2—cooling towers, D + FWT—deaerator with feed-water tank, DH—district heating, DHE—district heat exchangers, G—generator, HP—high-pressure regeneration, LP—low-pressure regeneration, P—pump, and ST—steam turbine

Grahic Jump Location
Fig. 3

Model of the CHP unit (BC-50)

Grahic Jump Location
Fig. 4

Model of the CCHP unit (BC-50) with the absorption chillers

Grahic Jump Location
Fig. 5

Annual diagram of heat and cooling agent demand [45]

Grahic Jump Location
Fig. 6

Simple and discounted value of profits in subsequent years of operation

Grahic Jump Location
Fig. 7

Sensitivity analysis for the trigeneration system with absorption chillers




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