Konferensartikel

Simulation of a Solar Assisted Combined Heat Pump-Organic Rankine Cycle-System

Stefan Schimpf
Ruhr-Universität Bochum, Thermodynamics, Bochum, Germany

Karsten Uitz
SIMAKA Energie- und Umwelttechnik GmbH, Argenbühl, Germany

Roland Span
Ruhr-Universität Bochum, Thermodynamics, Bochum, Germany

Ladda ner artikelhttp://dx.doi.org/10.3384/ecp110573937

Ingår i: World Renewable Energy Congress - Sweden; 8-13 May; 2011; Linköping; Sweden

Linköping Electronic Conference Proceedings 57:35, s. 3937-3944

Visa mer +

Publicerad: 2011-11-03

ISBN: 978-91-7393-070-3

ISSN: 1650-3686 (tryckt), 1650-3740 (online)

Abstract

In conventional collector systems for the supply of domestic hot water and space heating the collectors come to a standstill during summer whenever the maximum temperature in the storage tank is reached. The resulting excess heat can be harnessed by a combined heat pump-Organic Rankine Cycle-system. The aim of this work is to simulate such a system in order to determine the optimum operating conditions and impacts on power requirement and cost. For this purpose models for collector; storage tank; heat pump and geothermal heat exchanger are implemented. First results indicate that the isentropic efficiency of the scroll expander has the largest influence on the ORC-revenue. For a system consisting of 12 m² flat-plate collector area with an expansion efficiency of ?s; exp 0.7 = the power requirement for space heating and domestic hot water is reduced by 3.6%; whereas the costs decrease by 42 € or 12.3% respectively compared to a conventional system. The results suggest that an installation is more reasonable in larger dwelling units like hotels; senior citizens’ homes and multiple family dwellings.

Nyckelord

Solar Heating; Organic Rankine Cycle; Heat pump

Referenser

[1] J L. Wolpert; S. B. Riffat; Solar-powered Rankine system for domestic applications; Applied Thermal Engineering 16; 1996; pp. 281-289. doi: 10.1016/1359-4311(95)00032-1.

[2] C.-H. Kuo; W.-J. Yang; N. Arai; K. Mori; Solar-powered organic Rankine system for domestic electric-power generation; Energy and the environment: Proceedings of the Second Trabzon International Energy and Environment Symposium; 1999; pp. 67-74.

[3] A. Delgado-Torres; L. Garcia-Rodriguez; Analysis and optimization of the low-temperature solar organic Rankine cycle (ORC); Energy Conversion and Management 51; 2010; pp. 2846-2856. doi: 10.1016/j.enconman.2010.06.022.

[4] X. R. Zhang; H. Yamaguchi; K. Fujima; M. Enomoto; N. Sawada; Theoretical analysis of a thermodynamic cycle for power and heat production using supercritical carbon dioxide; Energy 32; 2007; pp. 591-599. doi: 10.1016/j.energy.2006.07.016.

[5] Y. Chen; W. Pridasawas; P. Lundqvist; Dynamic simulation of a solar-driven carbon dioxide transcritical power system for small scale combined heat and power production; Solar Energy 84; 2010; pp. 1103-1110. doi: 10.1016/j.solener.2010.03.006.

[6] R. B. Peterson; H. Wang; T. Herron; Performance of a small-scale regenerative Rankine power cycle employing a scroll expander; Proceedings of the Institution of Mechanical Engineers/ Part A; Journal of power and energy 222; 2008; pp. 271-282. doi: 10.1243/09576509JPE546.

[7] H. Wang; R. B. Peterson; T. Herron; Experimental performance of a compliant scroll expander for an organic Rankine cycle; Proceedings of the Institution of Mechanical Engineers/ Part A; Journal of power and energy 223; 2009; pp. 863-872. doi: 10.1243/09576509JPE741.

[8] T. Saitoh; N. Yamada; S. Wakashima; Solar Rankine Cycle System Using Scroll Expander; Journal of Environment and Engineering 2; 2007; pp. 708-718. doi: 10.1299/jee.2.708.

[9] EN 12975; Thermal solar systems and components - Solar collectors - Part 2: Test methods; 2006.

[10] K. Scharmer; J. Greif; The European solar radiation atlas; Les Presses de L’École des Mines; 1st Edition; 2000.

[11] E. W. Lemmon; M. O. McLinden; M. L. Huber; NIST Reference Fluid Thermodynamic and Transport Properties – REFPROP. NIST Standard Reference Database 23; Version 8; 2002.

[12] L. Lamarche; B. Beauchamp; A fast algorithm for the simulation of GCHP systems; ASHRAE Transactions 113; 2007; 470-476.

[13] C. Yavuzturk; J. D. Spitler; A short time step response factor model for vertical ground loop heat exchangers; ASHRAE Transactions 105; 1999; 475-485.

[14] J. A. Duffie; W. A. Beckman; Solar Engineering of Thermal Processes; Jon Wiley & Sons; 2nd Edition; 1980; pp. 98-101.

Citeringar i Crossref