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Research Papers

Design and Performance Evaluation of a Heat Exchanger Network for a Cogeneration DMS to Various Thermal Utilization Applications

[+] Author and Article Information
Gaoming Ge

Department of Mechanical Engineering, University of Saskatchewan,
57 Campus Drive, Saskatoon, SK S7N 5A9, Canada
e-mail: gag827@mail.usask.ca

Carey J. Simonson

Department of Mechanical Engineering, University of Saskatchewan,
57 Campus Drive, Saskatoon, SK S7N 5A9, Canada
e-mail: Carey.Simonson@usask.ca

Manuscript received July 24, 2015; final manuscript received June 1, 2016; published online October 12, 2016. Assoc. Editor: Jovica R. Riznic.

ASME J of Nuclear Rad Sci 2(4), 041006 (Oct 12, 2016) (6 pages) Paper No: NERS-15-1166; doi: 10.1115/1.4033770 History: Received July 24, 2015; Accepted June 01, 2016

Hitachi-GE developed a 300-MWe-class modular simplified and medium small reactor (DMS) between 2000 and 2004. It was designed to have merits over traditional nuclear power plants in areas of lower initial capital investment, flexibility, enhanced safety, and security. The balance of plant (BOP) system of the DMS was originally designed for supplying just electricity. In this study, the cogeneration DMS that supplies both electricity and heat is under investigation. The heat exchanger (HX) network, mainly consisting of the BOP heat exchanger, water pump, and the heat exchangers that deliver heat to the thermal utilization (TU) applications, must operate in an efficient way to keep the overall system costs low. In this paper, the configuration of a heat exchanger network that serves for various TU applications is investigated first. A numerical model for the heat exchanger network is built, and sensitivity studies are performed to estimate the energy efficiency and exergy efficiency of the whole heat exchanger network under different design and operating conditions (e.g., different water temperatures and flow rates). Important design and operating parameters, which significantly impact the performance of the network, are evaluated and presented.

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References

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Figures

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Fig. 1

Schematic of the cogeneration DMS plant

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Fig. 2

Schematic of the cogeneration DMS plant where steam condensate is returned to either condenser or feedwater line

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Fig. 3

Schematics of the (a) parallel, (b) serial, and (c) hybrid configuration of the heat exchanger network transferring heat from a BOP heat exchanger to multiple heat exchangers for TUs

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Fig. 4

Parallel heat exchanger network configuration for three TU applications

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Fig. 5

Effect of supply water temperature for TUs on the energy and exergy efficiencies of HX network

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Fig. 6

Effect of temperature difference of TUs on the energy and exergy efficiencies of HX network

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Fig. 7

Effect of ratio of heat capacity rate in TU exchangers on the energy and exergy efficiencies of HX network

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Fig. 8

Effect of fluid velocity on the energy and exergy efficiencies of HX network

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