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3D 프린팅을 위한 수리미 제조 시 다당류 알긴산 첨가에 따른 물성 변화
김한호 ( Han-ho Kim ),최예희 ( Ye-hui Choi ),박예린 ( Ye-lin Park ),박정철 ( Jeong-cheol Park ),한현수 ( Hyeon-su Han ),강유석 ( Yoo-seok Kang ),김수형 ( Soo-hyeong Kim ),서훈서 ( Hun-seo Seo ),강우신 ( Woo-sin Kang ),김수룡 ( Su- 한국수산과학회(구 한국수산학회) 2021 한국수산과학회지 Vol.54 No.2
When manufacturing Alaska pollack Gadus chalcogrammus surimi for 3D printing, it examined the characteristics of physical properties and sensuality by adding polysaccharides alginic acid [0, 1, 2, 3% (w/w)]. As a result of the color value of surimi by adding alginic acid, it showed that the lightness of heated surimi containing 2% (w/w) alginic acid was the highest and ΔE value was the lowest. In the changes in physical properties, the heated surimi of 3% (w/w) alginic acid content showed the lowest values of hardness, springiness, cohesiveness, gumminess, chewiness and resilience, but the highest adhesiveness. In the case of fried surimi, its hardness, cohesiveness, gumminess, chewiness and resilience were the lowest at the content of 3% (w/w) alginic acid. After 7 days of cold storage, the hardness, gumminess, and chewiness of heated surimi with an alginic acid content of 2% (w/w) were significantly higher, and fried surimi was also the same. In the results of the sensory evaluation, there were significant differences according to the alginic acid content in hardness and fishy smell, and as the alginic acid content increased, it felt more fishy smell, resulting in poor preference.
변속 펌프의 에너지 효율 제어를 통한 HVAC 수배관 시스템의 에너지 절감
김서훈(Kim Seo-Hoon),곽노열(Kwak Ro-Yeul) 대한건축학회 2012 대한건축학회논문집 Vol.28 No.2
This paper presents the optimal control strategies for variable speed control systems in office building HVAC hydronic systems to improve their energy efficiencies. It is necessary to prepare a method for reducing energy through efficient energy management on such equipments. In case of regular building, a problem of wasting energy is caused as there is no control on disutility due to degradation of chiller’s performance by applying a constant water volume control system of a constant speed pump to HVAC hydronic system, pump power is wasted under part load operating condition, and there is no change of flow according to load variation. This study applied two strategies for controling energy efficiency through optimal control and operation of pumps of flow according to load variation by applying variable speed control to circulating pumps of the HVAC hydronic system. The first strategy for energy efficiency control is to reduce energy used in circulation part of the HVAC hydronic system through pump sequence control and operating number control by applying wire-to-water efficiency control of pumps. And the second one is an energy efficiency control strategy which controls speed of pumps which circulates and provide flow responding to the load through pressure different setpoint optimal control by using open signals of flow control valves with factors for operating optimal control of HVAC circulation pump system. The results showed that about 6.7?11.9% of heat source energy and 24.4?44.2% of pump energy could be saved by using these optimal control strategies.