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

Qingkun Meng, Liang Cai, Wenxiu Ji, Jie Yan, Tao Zhang and Xiaosong Zhang
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Qingkun Meng: Air Conditioning and Refrigeration Laboratory, School of Energy and Environment, Southeast University, 2 Sipailou Street, Xuanwu District, Nanjing 210096, China
Liang Cai: Air Conditioning and Refrigeration Laboratory, School of Energy and Environment, Southeast University, 2 Sipailou Street, Xuanwu District, Nanjing 210096, China
Wenxiu Ji: Air Conditioning and Refrigeration Laboratory, School of Energy and Environment, Southeast University, 2 Sipailou Street, Xuanwu District, Nanjing 210096, China
Jie Yan: Air Conditioning and Refrigeration Laboratory, School of Energy and Environment, Southeast University, 2 Sipailou Street, Xuanwu District, Nanjing 210096, China
Tao Zhang: Air Conditioning and Refrigeration Laboratory, School of Energy and Environment, Southeast University, 2 Sipailou Street, Xuanwu District, Nanjing 210096, China
Xiaosong Zhang: Air Conditioning and Refrigeration Laboratory, School of Energy and Environment, Southeast University, 2 Sipailou Street, Xuanwu District, Nanjing 210096, China

Energies, 2015, vol. 8, issue 10, 1-22

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.

Keywords: energy management; HPGHP; SOC; torque limits; comprehensive efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
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