Flowing Rock
(No.3, 2022)Review of Research on Thermal Management Technology for Electric Vehicles
Thermal management technology for electric vehicles guarantees safety and comfort of driving, and it is one of the key technologies in the development of electric vehicles. The research progress and development trends of thermal management technology were introduced considering the thermal management demand, development history, and key components. Trends and prospects of the future technological development of thermal management in electric vehi...
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Flowing Rock
(No.3, 2022 )Current Status and Future Perspectives of Radiative Sky Cooling
Radiative sky cooling cools an object on the Earth's surface by emitting thermal radiation through the “atmospheric window” (mainly in the wavelength range of 8-13 μm) to the cold universe. As a passive technique to reduce cooling energy requirements without power input, radiative cooling provides a new pathway to address the challenges of the energy crisis and global warming. Over the past few decades, radiative cooling has been restricted to ni...
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Flowing Rock
(No.3, 2022 )Model and Parametric Analysis of Solar-assisted Ground-source Heat Pump System with Dua...
A solar-assisted ground-source heat pump system is an excellent way of supplying clean energy in extremely cold regions. In this system, the solar energy collection and storage system has different connection and operation modes from the ground-source heat pump system. The running time of the solar system directly affects the thermal recovery characteristics of the soil. In this study, a solar-assisted ground-source heat pump system with annual h...
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Flowing Rock
(No.2, 2022 )Performance Analysis of CO2 Dual-temperature Evaporation Heat Pump System with an Eject...
Replacing conventional boilers with an efficient heat pump system is an effective solution to achieving “carbon peaking and carbon neutrality”. In this study, a CO2 heat pump system adopting an ejector to realize dual-temperature evaporation is proposed for cascade utilization of waste heat and high-efficiency heating. Thermodynamic models of the baseline CO2 system (Base), conventional CO2 ejector system (Ej-Evap1), and CO2 ejector system with d...
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Flowing Rock
(No.6, 2021)Theoretical Study of a Novel CO2 Supersonic Two-phase Expansion Refrigeration Cycle
Natural refrigerants such as CO2 have become a research hotspot. Under high-pressure conditions, a large throttling loss becomes the primary reason for the low circulation efficiency of the CO2 refrigeration cycle. Therefore, reducing the throttling loss is an effective method to improve efficiency. This study proposes a supersonic two-phase expander with a Laval nozzle as the core component. A CO2 supersonic two-phase expansion refrigeration cyc...
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Flowing Rock
(No.5, 2021) Current Situation of Refrigerant Recovery and Reclaim
The recovery and reclamation of refrigerants is a recommended method of reducing refrigerant emissions, which requires technical support and policies to stimulate the activity. In this study, the policies for supporting refrigerant recovery as well as the quantity of recovered refrigerants reported in Japan, EU, USA, and China are summarized and compared, and the working principles, advantages, disadvantages, and recommended application condition...
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