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RISS 인기검색어
- 검색키워드
- 저자 : 趙權玉 (검색결과 10 건)
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趙權玉,吳厚圭 釜山水産大學校 1978 釜山水産大學 硏究報告 Vol.18 No.1
This study was attempted to establish the basic data for the characteristics of high speed multi-cylinder compressor by measuring volumetric efficiency using orifice type flowmeter. The volumetric efficiency and refrigerating capacity was calculated basing on the quantity of the flow of ammonia vapor and pressure difference in suction state of orifice plate and compressor. From the results the actual volumetric efficiency and refrigerating capacity were about 15% and 25% lower than that of data presented by maker respectively, and it tended to reduce obviously by lowing evaporating temperature under -25℃.
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趙權玉,趙永濟 釜山水産大學校 1978 釜山水産大學 硏究報告 Vol.18 No.1
凍굴의 凍結變性을 抑制하여 解凍時流出되는 drip量을 減少시키기 위하여 굴을 凍結前에 16種類의 添加物 溶液에 10分間 浸漬處理하여 凍結貯藏한 후 解凍하였을 때의 free drip量, expressible drip量, drip中의 全窒素量, DNA量, VBN量, 그리고 解凍後의 遊離水量 및 加熱 튀김減量 等을 定量하였다. 1) 試料의 個體에 따른 drip流出量은 個體가 작은 것이 큰 것보다 많았으며 處理液의 濃度가 높을수록 drip量이 적었다. 그리고 混合處理區가 單獨處理區 보다 drip流出量이 적었다. 2) drip中의 全窒素量은 大體로 drip流出量에 比例하였으며 混合處理液의 效果가 컸었다. 3) pH는 鹽處理區가 약간 低下하였고 燐酸鹽處理區는 7.0이상이었다. 4) 處理液의 濃度別 및 種類別에 따른 DNA의 變化는 drip流出量과 비슷한 경향을 나타내었다. 5) VBN은 食鹽處理區에서는 增加하였고 燐酸鹽處理區에서는 多少 減少하였으며 drip 流出量과는 반드시 比例하는 것은 아니었다. 6) Sucrose와 燐酸鹽處理區가 遊離水 流出抑制效果가 多少있었다. 7) 加熱튀김減量은 食鹽을 除外한 全處理區 모두 處理液의 濃度가 높을수록 적었다. It is well known that the frozen foodstuffs exude much drip on thawing. This undesirable drip loss is considered to be a measure of quality estimation and of the several factors affecting the drip loss, maintaining freshness of materials may be more important than any others. In the present paper, therefore, the amount of drip and its quality changes were tested in order to find out effect of pretreatment as means of maintaining freshness with several salt solutions on the denaturation of frozen oysters. After shelling, oysters divided into two groups as small and large were washed with fresh water and treated with solutions of sodium chloride, sucrose, poly-mixer(pyro-+tri-;1:1), mixed phosphates(ortho-+meta-+para-; 1:1:1) and these mixture, and then refrigerated at -30℃ by semi-air blast freezer. The total nitrgen, DNA, VBN, released water content and weight loss by cooking as well as the amount of free and expressible drips were also determined during 90 days storae at -25℃. As results of this experiments, the small oysters exude more drip than the large ones. The amount of total drip decreased as the concentration of solutions increased and it is similar to the total nitrogen and DNA in the drip. The amount of VBN increased in the sodium chloride treatment contrary to decrease in the case of phosphate. On the other hand, the pH of drip dropped slightly in treatment with sodium chloride and rose in case of phosphate. The water holding capacity of oysters was counterproportional to the drip loss and the effect of solutions used in treatment. The weight loss by cooking decreased in the all treatments except only one as the concentration of the solutions increased but sodium chloride exhibited adverse effect. It could be concluded from this study that pretreatments with solutions of some salts or sucrose would effective in maintaining the quality of frozen oysters.
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R - 11 응축열전달에 미치는 불응축가스 및 과열의 영향
오후규,조권옥,금종수 한국수산학회 1985 한국수산과학회지 Vol.18 No.2
An experimental investigation on condensing heat transfer for the Refrigerant-11 superheated vapor during condensation on the 40㎜ O.D by 75㎜ long horizontal tube is carried out under the various conditions of air contents as noncondensable gas, condensing pressure, and coolant temperature. The data span a refrigerant flow range from 23 to 65㎏/h and weight fractions of noncondensable gas range from 0 to 15%. The comparisons are made using data obtained by the authors and further data obtained from other sources. The characteristics of the condensing heat transfer of refrigerant superheated vapor with and without noncondensable gas flowing horizontally are revealed experimentally, and on the basis of the data obtained, correlations for predicting heat transfer coefficient during condensation on the tube are proposed.
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오후규,조권옥 한국수산학회 1977 한국수산과학회지 Vol.10 No.1
The characteristics of two stage compressor which is constituted of two separated reciprocating compressors was tested measuring the volumetric efficiency of each compressor at suction of both high and low pressure side using orifice type flowmeters. The volumetric efficiency of low pressure side compressor was lower than that of the high side when they were operating under the same compression ratio. And it tended to reduce obviously by lowering evaporating temperature resulting in a markable reduction of refrigerating capacity at the same time. It is assumed that the falling of volumetric efficiency at low side compressor was directed by the decrease in evaporating temperature which derives the falls of gas pressure at suction, increase in compression ratio, and gas flow resistance at suction and discharge valves.
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냉동압축기용(冷凍壓縮機用) 환상형토출(環狀型吐出)밸브의 변형(變形)
정진웅,조권옥,Jeong, J.W.,Jo, K.O. 대한설비공학회 1988 설비저널 Vol.17 No.2
On a refrigeration compressor, damage of a discharge valve is one of the annoying troubles for an engineer. Small size compressors, having ring plate type discharge valve are recently used. Therefore, it is very important for engineers to measure and analyze strains of discharge valve. The purpose of this study is to obtain the basic data of the strain of the flexible ring valve. Measurements were performed by the strain gauge bonded on the surface of the flexible ring valve. Stress and strain of the valve were calculated by the method of uniformly loaded circular plates with a central hole. The results obtained are as follows; (1) the strain of flexible ring discharge valve in refrigeration compressor was influenced by tension and compression strain simultaneously. (2) for a given discharge pressure, the tangential and radial strains was increased with increasing discharge pressure. (3) the valve of radial strain was larger than that of tangential strain.
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오후규,조권옥 한국수산학회 1979 한국수산과학회지 Vol.12 No.1
Volumetric efficiency is a determining factor for the measurement of compessor capacity, but it is practically hard to take an accurate measurement of capacity characteristics so that most of users trust the data of makers catalogue. We often realized the discrepancy in their data with actual capacity. This study was attempted to establish the basic data of capacity characteristics of compressor by measuring volumetric efficiency of high speed multi-cylinder compressor and rotary compressor. The volumetric efficiency was calculated based on the quantity of the flow of ammonia vapor and pressure difference in suction state of orifice plate and compressor. The volumetric efficiency of high speed multi-cylinder compressor was 37-61% and that of rotary compressor was 57-82% when compression ratio was in the range of 4-12. The discrepancy in volumetric efficiency at an equal evaporating temperature between the makers catalogue and the measured data was 5.5%.
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