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Energies 2015, 8(10), 11254-11275; doi:10.3390/en81011254

Energy Management of a Hybrid-Power Gas Engine-Driven Heat Pump

Air Conditioning and Refrigeration Laboratory, School of Energy and Environment, Southeast University, 2 Sipailou Street, Xuanwu District, Nanjing 210096, China
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Academic Editor: Terese Løvås
Received: 22 June 2015 / Revised: 5 September 2015 / Accepted: 6 October 2015 / Published: 12 October 2015
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Abstract

The hybrid-power gas engine-driven heat pump (HPGHP) combines hybrid power technology with a gas engine heat pump. The engine in the power system is capable of operating constantly with high thermal efficiency and low emissions during different operating modes. In this paper, the mathematical models of various components is established, including the engine thermal efficiency map and the motor efficiency map. The comprehensive charging/discharging efficiency model and energy management optimization strategy model which is proposed to maximize the efficiency of instantaneous HPGHP system are established. Then, different charging/discharging torque limits are obtained. Finally, a novel gas engine economical zone control strategy which combined with the SOC of battery in real time is put forward. The main operating parameters of HPGHP system under energy management are simulated by Matlab/Simulink and validated by experimental data, such as engine and motor operating torque, fuel consumption rate and comprehensive efficiency, etc. The results show that during 3600 s’ run-time, the SOC value of battery packs varies between 0.58 and 0.705, the fuel consumption rate reaches minimum values of approximately 291.3 g/(kW h) when the compressor speed is nearly 1550 rpm in mode D, the engine thermal efficiency and comprehensive efficiency reach maximum values of approximately 0.2727 and 0.2648 when the compressor speed is 1575 rpm and 1475 rpm, respectively, in mode D. In general, the motor efficiency can be maintained above 0.85 in either mode. View Full-Text
Keywords: energy management; HPGHP; SOC; torque limits; comprehensive efficiency energy management; HPGHP; SOC; torque limits; comprehensive efficiency
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Meng, Q.; Cai, L.; Ji, W.; Yan, J.; Zhang, T.; Zhang, X. Energy Management of a Hybrid-Power Gas Engine-Driven Heat Pump. Energies 2015, 8, 11254-11275.

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