Experimental Investigation on the Use of Secondary Refrigerant in Freezer for Energy Savings

2014 ◽  
Vol 493 ◽  
pp. 233-238
Author(s):  
Aries Prih Haryono ◽  
Edi Sukamto ◽  
Sumeru ◽  
Farid Nasir Ani
Keyword(s):  
Aqueous Solution ◽  
Experimental Study ◽  
Experimental Investigation ◽  
Power Consumption ◽  
Propylene Glycol ◽  
System Performance ◽  
Energy Savings ◽  
Electrical Power ◽  
Cooling Capacity ◽  
Electrical Power Consumption

This study presents an experimental study on a freezer which has small cooling capacity. Typically a freezer uses primary refrigerant (direct cooling) to cool or freeze a product. In this study, a prototype of freezer using a compressor 250 W nominal power at 220V was designed and constructed. The freezer is operated on two conditions, that is, using primary and secondary refrigerant. R22 and R290 (propane) were used as primary refrigerant, whereas aqueous solution of propylene glycol as secondary refrigerant. Comparison of the system performance between the primary and the secondary refrigerant werepresented. Also, the experimental results showed that the use of R290 as primary refrigerant to replace R22 in the freezer could save electrical power consumption by 18.5%. Meanwhile, the use of the secondary refrigerant yielded energy savings by 33.19% compared with the primary refrigerant.

Design Rules for Low Electrical Power Consumption in Nonlinear Silicon Waveguides with Active Carrier Removal

2021 ◽  
Author(s):  
Valerio Vitali ◽  
Hao Liu ◽  
Iosif Demirtzioglou ◽  
Cosimo Lacava ◽  
Kyle R. H. Bottrill ◽  
...  
Keyword(s):  
Power Consumption ◽  
Electrical Power ◽  
Design Rules ◽  
Silicon Waveguides ◽  
Electrical Power Consumption

scholarly journals Experimental investigation of wing flexibility on force generation of a hovering flapping wing micro air vehicle with double wing clap-and-fling effects

2017 ◽  
Vol 9 (3) ◽  
pp. 187-197 ◽  
Author(s):  
Quoc V Nguyen ◽  
Woei L Chan ◽  
Marco Debiasi
Keyword(s):  
Experimental Investigation ◽  
Power Consumption ◽  
High Speed ◽  
Electrical Power ◽  
Leading Edge ◽  
Flapping Wing ◽  
Micro Air Vehicle ◽  
Custom Made ◽  
Air Vehicle ◽  
Set Up

Experimental investigation of wing flexibility on vertical thrust generation and power consumption in hovering condition for a hovering Flapping-Wing Micro Air Vehicle, namely FlowerFly, weighing 14.5 g with a 3 g onboard battery and having four wings with double wing clap-and-fling effects, was conducted for several wing configurations with the same shape, area, and weight. A data acquisition system was set up to simultaneously record aerodynamic forces, electrical power consumption, and wing motions at various flapping frequencies. The forces and power consumption were measured with a loadcell and a custom-made shunt circuit, respectively, and the wing motion was captured by high-speed cameras. The results show a phase delay of the wing tip displacement observed for wings with high flexible leading edge at high frequency, resulting in less vertical thrust produced when compared with the wings with less leading edge flexibility at the same flapping frequency. Positive wing camber was observed during wing flapping motion by arranging the wing supporting ribs. Comparison of thrust-to-power ratios between the wing configurations was undertaken to figure out a wing configuration for high vertical thrust production but less power consumption.

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