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Full-Text Articles in Science and Technology Studies
Experimental Performance Analysis And Evaluation Of A Novel Frost-Free Air Source Heat Pump System, Zhihua Wang, Fenghao Wang, Zhenjun Ma, Mengjie Song, Wenke Fan
Experimental Performance Analysis And Evaluation Of A Novel Frost-Free Air Source Heat Pump System, Zhihua Wang, Fenghao Wang, Zhenjun Ma, Mengjie Song, Wenke Fan
Faculty of Engineering and Information Sciences - Papers: Part B
To tackle the problem of frosting occurred on the outdoor coil surface when an air source heat pump (ASHP) is operated in winter, a novel frost-free ASHP system has been developed. However, the dehumidification performance and the frost-free time of the system operated are highly dependent on the electronic expansion valve (EEV) opening of the 1st stage throttle. In addition, the coefficient of performance (COP) of the systems is controlled by the EEV opening of the 2nd stage throttle. Therefore, the objective of this study is to investigate the effect of the EEV opening on the system thermodynamic performance in …
Performance Evaluation And Lubrication Mechanism Of Water-Based Nanolubricants Containing Nano-Tio2 In Hot Steel Rolling, Hui Wu, Jingwei Zhao, Liang Luo, Shuiquan Huang, Lianzhou Wang, Suoquan Zhang, Sihai Jiao, Han Huang, Zhengyi Jiang
Performance Evaluation And Lubrication Mechanism Of Water-Based Nanolubricants Containing Nano-Tio2 In Hot Steel Rolling, Hui Wu, Jingwei Zhao, Liang Luo, Shuiquan Huang, Lianzhou Wang, Suoquan Zhang, Sihai Jiao, Han Huang, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part B
Hot rolling tests of a low-alloy steel were conducted at a rolling temperature of 850 °C under different lubrication conditions, including benchmarks (dry condition and water) and water-based nanolubricants containing different concentrations of nano-TiO2 from 1.0 to 8.0 wt%. The effects of nanolubricants on rolling force, surface roughness, thickness of oxide scale, and microstructure were systematically investigated through varying nano-TiO2 concentrations. The results show that the application of nanolubricants can decrease the rolling force, surface roughness and oxide scale thickness of rolled steels, and refine ferrite grains. In particular, the nanolubricant containing an optimal concentration (4.0 wt%) of …
A Two-Level Clustering Strategy For Energy Performance Evaluation Of University Buildings, Kehua Li, Zhenjun Ma, Duane A. Robinson, Jun Ma
A Two-Level Clustering Strategy For Energy Performance Evaluation Of University Buildings, Kehua Li, Zhenjun Ma, Duane A. Robinson, Jun Ma
Faculty of Engineering and Information Sciences - Papers: Part B
This paper presents a clustering strategy to evaluate the energy performance and identify typical daily load profiles of buildings. The cluster analysis included intra-building clustering and inter-building clustering. The intra-building clustering used Gaussian mixture model clustering to identify the typical daily load profiles of each individual building. The inter-building clustering used hierarchical clustering to further identify the typical daily load profiles of a stock of buildings based on the typical daily load profiles identified for each individual building. The performance of this strategy was tested and evaluated using the two-year hourly electricity consumption data collected from 40 buildings on a …
Performance Evaluation Of Full-Duplex Energy Harvesting Relaying Networks Using Pdc Self-Interference Cancellation, Jiaman Li, Le Chung Tran, Farzad Safaei
Performance Evaluation Of Full-Duplex Energy Harvesting Relaying Networks Using Pdc Self-Interference Cancellation, Jiaman Li, Le Chung Tran, Farzad Safaei
Faculty of Engineering and Information Sciences - Papers: Part B
In this paper, throughput and bit error performance of an in-band full duplex (IBFD) relaying system assisted by the radio frequency energy harvesting technique and the polarization-enabled digital self-interference cancellation (PDC) scheme are investigated. In particular, the relay node harvests power from the wireless radio frequency signal transmitted from the source node and uses this power to amplify and forward signals to the destination. Meanwhile, the PDC scheme is used at the relay node to cancel the self-interference signal in order to facilitate the concurrent in-band transmission and reception. The impact of both energy harvesting and self-interference cancellation on the …