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Battery performance comparison
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Power batteries of hybrid-power gas engine heat pump (HPGHP) often encounter frequent charge and discharge operations, which have an adverse effect on nature gas conversion efficiency of system. In order to improve the dynamic efficiency and economic performance of HPGHP, this paper raises a coaxial HPGHP facility, which takes the LiFePO4 battery a...
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Context 1
... [7] has built model of lead-acid battery and conclude that the charging efficiency keeps above 0.9 when the charging current value is below 30A, while the average discharge efficiency is higher than 0.93 when the discharging current is less than 50A. Table 1 shows performance comparison of three kinds of batteries mainly used in hybrid cars, which indicates that Lithium-ion battery is the best choice of HPGHP battery, owing to its high energy density, high power density, long cycle life and environmental friendliness. Within the Li-ion battery family, the LiFePO4 type has been considered to be one of the most suitable technologies for high-power automotive applications due to an attractive combination of safety, cycle and calendar life and performance [8][9][10]. ...
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Citations
... The presented results show that the LiFePO4 battery performs better than th lead-acid battery. On the other hand, in [52] the authors show that the LiFePO4 battery can achieve a better energy saving effect, especially under high-load and low-load condi tions. Compared to the GEHP system, the gas conversion efficiency can increase by ap proximately 7.6% when the logic threshold control strategy is applied in the HPGHP sys tem [53]. ...
... The presented results show that the LiFePO4 battery performs better than the lead-acid battery. On the other hand, in [52] the authors show that the LiFePO4 battery can achieve a better energy saving effect, especially under high-load and low-load conditions. Compared to the GEHP system, the gas conversion efficiency can increase by approximately 7.6% when the logic threshold control strategy is applied in the HPGHP system [53]. ...
In this paper the most promising developments of technology for gas engine-driven heat pumps for the last 15 years are presented. The purpose is to present the latest research studies and changes in this type of device, as well as to help readers to search for publications containing relevant aspects of gas engine heat pumps. Gas engine-driven heat pumps are devices for parallel heating and cooling production based on compressor heat pump technology. However, unlike heat pumps with compressors powered by electric motors, gas engine-driven heat pumps are driven by gas internal combustion engines. The reviewed solutions are an interesting alternative to traditional heating systems, characterized by the higher than 1.0 Performance Energy Ratio which expresses the degree of conversion of the energy contained in the fuel supplied to the device into energy transported to the utility needs. Presented in this review, papers show different solutions for conversion of the energy contained in the fuel into mechanical and thermal energy, and mechanical energy through the shaft system is used to drive the compressor of the heat pump. The presented study shows that, due to the complexity of the system and the wide range of applications, the technology has been subjected to detailed analyses and optimizations during the last 30 years in order to increase the efficiency of devices.
... The formation of a mixtured two-phase was resulted in a narrow voltage range for LiFePO 4 . For LiMn 2 O 4 [39][40][41][42] and LiFePO 4 [30,31,[43][44][45] under a charging voltage of 4.2 V and discharge current of 0.1C, a summarization of the operating voltages and capacities is shown in Fig. 2. It is easy to find that LiMn 2 O 4 has higher operating voltages as compared to LiFePO 4 . However, its capacity is lower. ...
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