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.
Highlights
Since the beginning of the 21st century, hybrid technology has played an important role in the development of automobile technology [1,2,3,4,5]
The comprehensive efficiency of the hybrid-power gas engine-driven heat pump (HPGHP) system in the discharging conditions is defined as the ratio of the compressor input power and the actual output power, which flows from the natural gas bottle to the HPGHP system, as shown in Equation (16)
When the HPGHP system is operating under stable manual transmission, the engine speed corresponds to the compressor speed
Summary
Since the beginning of the 21st century, hybrid technology has played an important role in the development of automobile technology [1,2,3,4,5]. The development of distributed energy systems based on natural gas will be a major trend in the future, so natural gas as a new energy driving air conditioning equipment will be important. The HPGHP system, compared with the conventional gas heat pump system, has a high thermal efficiency. The determination of economic zone is too fuzzy to describe, in order to substantially improve the thermal efficiency, to operate in the economical zone all the time and to minimize the gas consumption rate and emission levels, a comprehensive charging/discharging efficiency model and an energy management optimization strategy model of HPGHP system is established in this paper. Various important energy operating parameters of the HPGHP system, such as engine or motor operating torque, fuel consumption rate and comprehensive efficiency, are investigated and analyzed in the proposed model. The significance of this model will be discussed at the conclusion of this paper
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