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Research Papers: Energy Systems Analysis

Modeling and Performance Analysis of an Integrated System: Variable Speed Operated Internal Combustion Engine Combined Heat and Power Unit–Photovoltaic Array

[+] Author and Article Information
Robert Radu

Department of Engineering and Architecture,
University of Trieste,
Via Alfonso Valerio 10,
Trieste 34127, Italy
e-mail: rradu@units.it

Diego Micheli

Department of Engineering and Architecture,
University of Trieste,
Via Alfonso Valerio 10,
Trieste 34127, Italy
e-mail: micheli@units.it

Stefano Alessandrini

Department of Engineering and Architecture,
University of Trieste,
Via Alfonso Valerio 10,
Trieste 34127, Italy
e-mail: salessandrini@units.it

Iosto Casula

Department of Engineering and Architecture,
University of Trieste,
Via Alfonso Valerio 10,
Trieste 34127, Italy
e-mail: iosto.casula@libero.it

Bogdan Radu

Faculty of Mechanical Engineering
and Mechatronics,
University “Politehnica” of Bucharest,
Splaiul Independentei nr. 313, Sector 6,
Bucharest 060042, Romania
e-mail: bobitaradu@yahoo.com

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received October 4, 2013; final manuscript received December 16, 2014; published online January 8, 2015. Assoc. Editor: Andrea Lazzaretto.

J. Energy Resour. Technol 137(3), 032001 (May 01, 2015) (10 pages) Paper No: JERT-13-1282; doi: 10.1115/1.4029450 History: Received October 04, 2013; Revised December 16, 2014; Online January 08, 2015

The paper presents the model of a combined heat and power (CHP) unit, based on a variable speed internal combustion engine (ICE) interfaced with a photovoltaic (PV) system. This model is validated by means of experimental data obtained on an 85 kWe CHP unit fueled with natural gas and a PV system with a rated power of 17.9 kW. Starting from daily load profiles, the model is applied to investigate the primary energy saving (PES) of the integrated CHP + PV system in several operating conditions and for different sizes of PV array. The results demonstrate the dependence of the CHP performance on the operating mode and a limited convenience of the variable speed strategy. The integrated system operation leads to performance improvements, which depend on the size of the PV component.

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Figures

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Fig. 1

Simulation model layout

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Fig. 2

CHP unit schematic: 1—engine coolant heat exchanger, 2—exhaust gas heat exchanger, 3—emergency radiator, 4—diverter valve, 5—rectifier, 6—inverter, 7—battery pack, and 8—data acquisition PC

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Fig. 3

PV panel power curves

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Fig. 4

Inverter operating curves

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Fig. 5

PV system diagram: 1 and 2—multi function device and 3—remote monitoring PC

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Fig. 6

Integrated system schematics

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Fig. 7

Comparison between ICE simulated (S) and manufacturer (M) data of engine power—full load

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Fig. 8

Comparison between simulated (S) and manufacturer (M) data of brake mean effective pressure—full load

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Fig. 9

Simulated efficiency map. Variable speed strategy operating curve (VSC—experimental) versus constant speed strategy operating curve (CSC—simulated).

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Fig. 10

Electrical efficiency variation with the electrical power: M = manufacturer data, S = simulation data, E = experimental data. Variable speed strategy.

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Fig. 11

Thermal efficiency variation with the electrical power: M = manufacturer data, S = simulation data. Variable speed strategy.

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Fig. 12

Comparison between the simulated power output curves (S1 and S2) and the measured data (E) for the PV array

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Fig. 13

PES index in thermal priority mode for constant (nfix) and variable speed (nvar) strategies, CHP unit only

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Fig. 14

Hourly thermal load for one apartment, month of January (H = heating, W = hot water)

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Fig. 15

Hourly electrical load for one apartment, month of July (L = lighting, C = air conditioning)

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