• 산업경영시스템학회지
• /
• 제39권3호
• /
• pp.180-191
• /
• 2016

Optimizing energy usage for maximum efficiency is an essential goal for manufacturing plants in every industrial manufacturing sector. The generation and distribution of purifying compressed air is a large expense incurred in practically all manufacturing processes. Not only is the generation and treatment expensive equipment of compressed air, but frequent maintenance and effective operation is also required. As a plant's compressed air system is often an integral part of the production process, it needs to be reliable, efficient, and easy to be maintain. In this paper, we study to find operating method to save energy from the adsorption dryer in the process of purifying compressed air, which is required for a clean room production site in "A" company. The compressed air passes through a pressure vessel with two "towers" filled with a material such as activated alumina, silica gel, molecular sieve or other desiccant material. This desiccant material attracts the water from the compressed air via adsorption. As the water clings to the desiccant, the desiccant particle becomes saturated. Therefore, Adsorption dryer is an extremely significant facility which removes the moisture in the air $70^{\circ}C$ below the dew point temperature while using a lot of energy. Also, the energy consumption of the adsorption dryer can be varied by various operating conditions (time, pressure, temperature, etc). Therefore, based on existing operating experiments, we have searched operating condition to maximize energy saving by changing operating conditions of the facility. However, due to a short experiment period (from September to October), further research will be focused on considering seasonality.

• 산업경영시스템학회지
• /
• 제38권1호
• /
• pp.143-151
• /
• 2015

In this paper, we investigate how the power consumption of a heat pump dryer depends on various factors in the drying process by analyzing variables that affect the power consumption. Since there are in general many variables that affect the power consumption, for a feasible analysis, we utilize the principal component analysis to reduce the number of variables (or dimensionality) to two or three. We find that the first component is correlated positively to the entrance temperature of various devices such as compressor, expander, evaporator, and the second, negatively to condenser. We then model the power consumption as a multiple regression with two and/or three transformed variables of the selected principal components. We find that fitted value from the multiple regression explains 80~90% of the observed value of the power consumption. This results can be applied to a more elaborate control of the power consumption in the heat pump dryer.

• 동력기계공학회지
• /
• 제20권2호
• /
• pp.73-78
• /
• 2016

In this study, the performance characteristics of a high temperature heat pump dryer that is able to raise the air temperature up to $80^{\circ}C$ by using waste heat as heat source were investigated numerically. The main components of the heat pump dryer were modeling as a compressor, condenser, evaporator and expansion device, and R245fa was selected as refrigerant. Experiments were also conducted to validate the numerical data. As a result, when the evaporator air inlet temperature increased from $50^{\circ}C$ to $65^{\circ}C$, the numerical results of the hot air temperature at outlet and heat pump COP were about 8~11% and 5~8% higher than that of experimental ones, respectively.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2000년도 춘계학술대회논문집B
• /
• pp.168-174
• /
• 2000

This paper illustrates the validity of reciprocating type superadiabatic combustor as a industrial applicable dryer. After the investigations of inner and surface temperature distributions of combustor various with air-fuel(methane) ratio, mixture flow rate and reciprocating time, this combustor can be applied in industrial dryer at certain operating conditions. The results are as follows. 1) Higher equilivalence ratio emits more radiation heat flux at the censer chamber 2) Higher mixture flow rate makes more uniform temperature distribution. however, due to the heat transfer from censer chamber to porous media, the radiation beat flux is worse. 3) Longer reciprocating time emit more radiation heat flux. however, this case also makes temperature distribution wide

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2008년도 추계학술대회B
• /
• pp.2856-2861
• /
• 2008

A catalytic burner has been developed to utilize thermal energy from the fossil fuel without nitrogen oxides (NOx) emission. The burner is shaped into a mat to maximize the heating surface. Premixed combustion has been developed to be used in a closed chamber, such as a radiation type industrial dryer. The burner yields the thermal energy in the form of thermal radiation in the infrared regime, which is proved to be effective to dry organic substances for low moisture condition. Thermal efficiency including the sensible heat is better correlated to the moisture compared to the dry rate.

• 대한기계학회논문집B
• /
• 제35권7호
• /
• pp.735-742
• /
• 2011

인체에 유해한 질소산화물($NO_x$)의 생성을 억제하면서 열효율을 높일 수 있는 새로운 버너의 개념으로 촉매 버너가 제안되었고 본 연구에서는 대표적인 에너지 다소비 설비인 건조기에 사용하기 위한 촉매버너를 개발하였다. 산업용 건조기에 활용하기 위해 촉매버너는 평평한 매트 형태로 제작되어 열전달 면적을 극대화하였고 밀폐 공간인 건조실에 활용하기 위하여 예혼합 연소방식을 적용하였다. 새로 개발된 촉매 버너를 산업용 건조기에 적용하여 실험한 결과 열에너지가 원적외선 형태로 공급되어 감율건조 영역에서 식품과 같은 유기물을 효과적으로 건조할 수 있음을 확인하였다. 또한 건조기의 열효율은 건조속도보다 피건조물의 함수율에 보다 큰 상관관계를 나타내었다.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2013년도 춘계학술대회 논문집
• /
• pp.1521-1522
• /
• 2013

• 에너지공학
• /
• 제19권4호
• /
• pp.228-233
• /
• 2010

기존의 열풍건조기의 효율은 약 30% ~ 50%인 반면, 최적 설계된 열풍-열펌프 건조기 효율은 약 60% ~ 80% 수준이므로 에너지 효율향상과 에너지 절약을 이룰 수 있다. 외국의 여러 사례에서는 기존 대비 약 60% ~ 80%의 에너지를 절약할 수 있으며, 밀폐형 순환방법을 사용하여 건조공기에 포함될 수 있는 환경오염물질의 외부로의 유출을 최소화 할 수 있어 기존의 건조기에 비해서 환경문제에 적극적으로 대응할 수 있을 것을 판단된다. 본 논문에서는 이와 같은 특성을 가진 건조기에 적용하기 위한 고온 생산이 가능한 열펌프를 얻기 위하여 시스템의 사이클을 설계하고 시스템을 구축하여 목표 성능을 만족하는지 여부를 확인하였다. 본 연구에서는 열펌프 복합건조기 적용을 위한 고온용 열펌프 시스템을 설계하고 제작한 후, 성능평가를 수행하여 다음의 결론을 얻었다. (1) 고온생산을 위한 시스템 설계는 2사이클이 가장 우수한 것으로 나타났다. (2) 2사이클 시스템은 저단이 R134a를, 고단이 R124를 냉매로 사용할 경우 가장 적합한 것으로 나타났다. (3) 사이클 운전을 통하여 상용압력으로 간주되는 범위에서 R134a시스템은 $75^{\circ}C$, R124시스템은 $95^{\circ}C$ 생산이 가능한 것으로 나타났다. (4) 수냉식 2사이클 시스템의 성능 시험을 수행한 결과 목표성능을 상회하는 결과를 얻어 고온 생산이 가능한 열펌프 시스템의 설계 및 제작이 가능한 것으로 나타났다.

• Journal of Biosystems Engineering
• /
• 제31권4호
• /
• pp.349-354
• /
• 2006

This study was performed to evaluate the performances for a concurrent flow rice dryer of pilot scale with devices for circulating rice. The pilot scale dryer with the capacity of 700 kg was developed to obtain design informations for the development of actual scale dryer of holding capacity of 10 tons. Three drying tests were conducted at two temperature levels of $100^{\circ}C\;and\;120^{\circ}C$, and two air flow rates levels of $28.5cmm/m^2\;and\;57.1cmm/m^2$. Drying conditions for Test-1, Test-2 and Test-3 were $100^{\circ}C\;-28.5cmm/m^2,\;120^{\circ}C-28.5cmm/m^2\;and\;120^{\circ}-57.1cmm/m^2}$ respectively. Drying rates were 0.73%(w.b./h) for Test-1, 0.90%(w.b./h) for Test-2 and 1.46%(w.b./h) for Test-3. The crack ratios of brown rice after drying ranged from 2.4% to 8.4%, and increased with the increase of drying rate and airflow rate. The energy consumptions were from 6,225 kJ/kg to 6,993 kJ/kg which was higher than that of conventional cross-flow rice circulating type dryer used in Korea. This results were due to the lower ambient air temperatures of $4.5^{\circ}C\;to\;13.4^{\circ}C$ during drying tests.

• 안전기술
• /
• 제187호
• /
• pp.48-49
• /
• 2013