Instantaneous steady state of pumpless organic Rankine cycle driven by low temperature heat source

LU Huitong1 JIANG Long1 WANG Liwei1 WANG Ruzhu1

(1.Key Laboratory for Power Machinery and Engineering of Ministry of Education, Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai, China 200240)

【Abstract】A small-scale pumpless organic Rankine cycle (ORC) system which can recover waste heat from low temperature heat resource is established to investigate the performance of the cycle. The system is mainly composed of two high efficient heat exchangers, one scroll expander, one generator, four refrigerant valves and eight water valves. The flow direction of the water and refrigerant is controlled by the valves. The water heated by electric heating boiler is used to simulate the low temperature heat resource. The temperature of the hot water ranges from 75 °C to 95 °C and the temperature gradient is 5 °C. The cooling water from the cooling tower is 25 °C accordingly. The refrigerant R245fa is selected as the working fluid. The results show that the largest power output is 232 W, and the stable power output is about 230 W when the inlet water temperature is 95 °C. The total time of power generation lasts for 380 s. One more thing is that the higher inlet water temperature results in the less time of power generation process. For the average steady power generation, the maximum energy efficiency is 3.92% and the minimum energy efficiency is 3.02% when the inlet water temperature is 95 °C and 85 °C, respectively.

【Keywords】 pumpless ORC; enthalpy; waste heat recovery; scroll expander; electricity generation efficiency;

【DOI】

【Funds】 National Natural Science Foundation of China (51606118)

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    References

    [1] YANG M H. Thermal and economic analyses of a compact waste heat recovering system for the marine diesel engine using transcritical Rankine cycle [J]. Energy Conversion and Management, 2015, 106: 1082–2096.

    [2] DESIDERI A, GUSEV S, VAN DEN BROEK M, et al. Experimental comparison of organic fluids for low temperature ORC (organic Rankine cycle) systems for waste heat recovery applications [J]. Energy, 2016, 97: 460–469.

    [3] WEI D H, LU X S, LU Z, et al. Performance analysis and optimization of organic Rankine cycle (ORC) for waste heat recovery [J]. Energy Conversion and Management, 2007, 48 (4): 1113–1119.

    [4] SCHUSTER A, KARELLAS S, KAKARAS E, et al. Energetic and economic investigation of organic Rankine cycle applications [J]. Applied Thermal Engineering, 2009, 29 (8/9): 1809–1817.

    [5] YU H S, FENG X, WANG Y F. Working fluid selection criteria for organic Rankine cycle [J]. Computers and Applied Chemistry, 2015, 32 (11): 1324–1328 (in Chinese).

    [6] YANG K, ZHANG H G, SONG S S, et al. Waste heat organic Rankine cycle of vehicle diesel engine under variable working conditions [J]. CIESC Journal, 2015, 66 (3): 1097–1103 (in Chinese).

    [7] LIU Q, DUAN Y Y, SONG H W. Thermal performance analysis of a biomass-fired Organic rankine cycle [J]. Proceedings of the CSEE, 2013, 33 (26): 60–67 + 1 (in Chinese).

    [8] GUO C, DU X Z, YANG L J, et al. Performance of organic Rankine cycle using zeotropic working fluids for geothermal utilization [J]. Proceedings of the CSEE, 2014, 34 (32): 5701–5708 (in Chinese).

    [9] QIAO W L, CHEN J F, XUE Q, et al. The comparison of working fluid used in ORC system driven by solar energy [J]. Energy Research and Utilization, 2010, (2): 31–36 (in Chinese).

    [10] A Y S, MA S Y, LU H T, et al. The selection of organic Rankine cycle system schemes and working fluids for automotive engine [J]. Research and Exploration in Laboratory, 2015, 34 (10): 18–23 (in Chinese).

    [11] KIM D K, LEE J S, KIM J, et al. Parametric study and performance evaluation of an organic Rankine cycle (ORC) system using low-grade heat at temperatures below 80°C [J]. Applied Energy, 2017, 189: 55–65

    [12] DENG L S, HUANG H Y, HE Z H, et al. Research progress on organic Rankine cycle [J]. Advance in New and Renewable Energy, 2014, 2 (3): 180–189 (in Chinese).

    [13] XU J J, LUO X L, WANG Y Z, et al. Optimum selection of ORC working fluid using multi-level fuzzy optimization and non-structural fuzzy decision [J]. CIESC Journal, 2015, 66 (3): 1051–1058 (in Chinese).

    [14] FU B R, LIN H L, LI Z. Effect on selection of actuating mediums in organic Rankine cycle thermodynamics system [J]. Marine Electric & Electronic Engineering, 2012, 32 (S1): 14–17 (in Chinese).

    [15] SONG J Z, ZHANG X S, LI S H, et al. Experimental characteristics of solar organic Rankine cycle system [J]. CIESC Journal, 2014, 65 (12): 4958–4964 (in Chinese).

    [16] LIU J, CHEN J P, QI Z G. Thermodynamic analysis of low temperature organic Rankine cycle [J]. CIESC Journal, 2010, 61 (S2): 9–14 (in Chinese).

    [17] WEI L L, ZHANG Y F, MU Y C. Study of evaporator in low-temperature energy conversion system using organic Rankine cycle (ORC) [J]. Crogenics, 2015, (6): 31–36 (in Chinese).

    [18] QIU G Q, LIU H, RIFFAT S. Expanders for micro-CHP systems with organic Rankine cycle [J]. Applied Thermal Engineering, 2011, 31 (16): 3301–3307.

    [19] SONG P P, WEI M S, SHI L, et al. A review of scroll expander for organic Rankine cycle systems [J]. Applied Thermal Engineering, 2015, 75: 54–64.

    [20] FIASCHI D, MANFRIDA G, MARASCHIELLO F. Design and performance prediction of a radial ORC turboexpanders [J]. Applied Energy, 2015, 138: 517–532.

    [21] ZIVIANI D, GUSEV S, LECOMPTS S, et al. Optimizing the performance of small-scale organic Rankine cycle that utilizes a single-screw expander [J]. Applied Energy, 2017, 189: 416–432.

    [22] GAO P, JIANG L, WANG L W, et al. The simulation of ORC and experimental study on scroll expander [J]. Journal of Refrigeration, 2014, 35 (1): 53–57 + 118 (in Chinese).

    [23] YE J Q, ZHAO L, DENG S, et al. Efficiency of working fluid pump in a small-scale organic Rankine cycle system [J]. Chemical Industry and Engineering Progress, 2016, 35 (4): 1027–1032 (in Chinese).

    [24] ZHANG H G, YANG Y X, MENG F X, et al. Experiment on the running performance the working fluid pump for organic Rankine cycle system [J]. CIESC Journal, 2017, 68 (9): 3573–3579 (in Chinese).

    [25] YAMADA N, WATANABE M, HOSHI A. Experiment on pumpless Rankine-type cycle with scroll expander [J]. Energy, 2013, 49: 137–145.

    [26] YAMADA N, MINAMI T, MOHAMAD M N A. Fundamental experiment of pumpless Rankine-type cycle for low-temperature heat recovery [J]. Energy, 2011, 36 (2): 1010–1017.

    [27] LI J, PEI G, LI Y Z, et al. Analysis of a novel gravity driven organic Rankine cycle for small-scale cogeneration applications [J]. Applied Energy, 2013, 108: 33–44.

    [28] LI J, PEI G, JI J. A novel organic thermodynamic cycle on the use of gravity for pressurization [J]. Journal of Engineering Thermophysics, 2012, 33 (5): 729–734 (in Chinese).

    [29] GAO P, SONG F P, WANG L W. The performance research about the novel combined cooling and power system [J]. Journal of Engineering Thermophysics, 2016, 37 (1): 16–20 (in Chinese).

    [30] GAO P, WANG L W, WANG R Z. Experimental investigation on a small pumpless ORC (organic Rankine cycle) system driven by the low temperature heat source [J]. Energy, 2015, 91: 324–333.

This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 68, No. 12, Pages 4709-4716

December 2017

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Article Outline

Abstract

  • Introduction
  • 1 Principle of pumpless ORC
  • 2 Analysis on instantaneous steady-state thermodynamics of system
  • 3 Experimental system and performance analysis
  • 4 Conclusions
  • References