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공조기용 Stainless Steel 배관의 S-N Curve 및 내구수명 예측 기법 연구
홍석표(Seok Pyo Hong),진심원(Sim Won Chin),이장우(Jang Woo Lee),김윤재(Yun Jae Kim),김주희(Ju Hee Kim) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.12
에어컨 사이클 배관의 내구성, 내식성 향상을 통해 제품의 신뢰성을 높이고, 강건 설계와 배관 구조 단순화를 통해 소형화, 경량화 달성을 목표로 기존 구리 배관 대비 50~70%의 두께로 동등 이상의 강도 및 가공성을 확보할 수 있는 연질 STS 배관을 적용하고자 시도 중이다. 이를 위해 본 연구에서는 실험적인 방법을 이용하여 후보 배관재료인 STS 304J1 재질과 배관 제작 시 사용되는 TIG 용접부의 인장 및 피로물성을 확인하였다. 또한 수치해석적 방법으로 가동조건에서 발생되는 STS 배관의 응력을 유한요소법을 이용하여 예측하였으며, 피로수명곡선으로부터 응력범위에 해당하는 수명을 예측함으로써 제품의 응력관리기법을 도출하였다. To increase product reliability by improving the durability, and corrosion resistance of air conditioner cycle pipes, and to achieve miniaturization, and weight reduction through the simplification of the steel construction system and pipe structure, the thickness of 50~70% could ensure greater strength and workability, than that of the existing copper pipes. We are promoting the development of usable, flexible STS piping. In this study, the tensile and fatigue properties of STS 304J1, which is considered as a piping material, and TIG welds used in piping manufacturing, were verified using an experimental method. Additionally, the stress generated in STS pipes under operating conditions, was predicted using the finite element method by numerical analysis; and the stress management method of the product was derived by predicting its life span corresponding to the stress range, from the fatigue life curve.
IEA ANNEX 54. 공조용 Low GWP 후보 냉매의 성능 평가
김민수(Min Soo Kim),고영환(Young Hwan Ko),진심원(Sim Won Chin) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.11
As the reinforcement of environment regulation, variety type of HVAC&R products have adapted alternative refrigerants. The most frequently used alternative refrigerant in residential and light commercial AC is R-32. R-32 shows high latent heat and low density. Cooling efficiency of R-32 is 5~7% higher than that of R-410A in window AC. In wall-mounted heat pump, seasonal cooling performance of R-32 is 3% higher compared to R-410A and seasonal heating performance is almost same. Other promising candidate for R-410A is R-454B. In scroll compressor, R-454B shows slightly lower performance compared to R-410A. In ceiling-mounted heat pump system, refrigerant charging amount of R-454B is about 86% compared to R-410A. Performance of R-454B is similar to that of R-410A. When calculating life cycle climate performance, direct CO2 emission of R-454B is the lowest because of low GWP and relatively small refrigerant charging. R-32 shows the lowest indirect CO2 emission because system efficiency is high. Overall, R-32 is the most eco-friendly refrigerant when considering CO2 emission of AC system.
신냉매 개발 동향과 R-410A 대체냉매의 LCCP 평가
고영환(Young Hwan Ko),김민수(Min Soo Kim),진심원(Sim Won Chin) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
Regulations on refrigerants challenge the HVAC&R industry to switch to lower GWP refrigerants. Choosing the right refrigerant requires evaluating a number of factors such as safety, environmental impact, energy efficiency and cost effectiveness. In this paper, the heating and cooling performance and life cycle climate performance of R-454B and R-32 applied to the existing system are evaluated. R-32 and R-454B are promising candidates for immediate replacement of R-410A due to their low toxicity and low flammability refrigerants and their lower global warming potential compared to R-410A. R-32 has the smallest refrigerant charge due to its low specific volume, and has the best cooling and heating performance and the smallest life cycle climate performance.
중형공간에서 중앙공조방식과 시스템에어컨 방식에 따른 PMV와 CO₂농도, 에너지소비량 비교
성상철(Sang-Chul Sung),노광철(Kwang-Chul Noh),진심원(Sim-Won Chin),오명도(Myung-Do Oh) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
PMV, CO₂ and the energy consumption performance were numerically investigated in a large space with air-conditioning systems of four type. The numerical results showed that thermal comforts in the occupied zone are nearly similar in three systems except 3-way wall type system air-conditioner with ventilation system installed 2.2m height from the bottom. In case of 3-way wall type system air-conditioner the energy consumption for cooling loads was reduced about 25.5% compared to other air-conditioning systems. From the viewpoint of IAQ, it was turned out that system air-conditioner with ventilation system became worse about 20% compared to central air-conditioning systems for cooling load. The PMV, CO₂ concentration and energy consumption of all systems for heating loads were similar in a large space considered.