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이공훈(Kong Hoon Lee),김욱중(Ook Joong Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Heat pump drying has a great potential for energy saving due to its high energy efficiency in comparison to conventional air drying. In the present study, the performance simulation for the basic design of a heat pump dryer has been carried out. The simulation includes one-stage heat pump cycle, simple drying process using the drying efficiency. As an example, the heat pump cycle with Refrigerant 134a has been investigated. For the operating conditions such as the average temperature of the condenser, the heat rate released in the condenser, the flow rate of drying air, and drying efficiency, the simulation has been carried out to figure out the performance of the dryer. The parameters considered in the design of the dryer are COP, MER, SMER, the rate of dehumidification, the temperature and humidity of drying air and those parameters are compared for different conditions after carrying out the simulation.
온도차 및 부하 저항에 따른 열전모듈의 발전 특성 분석
이공훈(Kong Hoon Lee),김욱중(Ook Joong Kim),고득용(Deuk Yong Koh) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
A thermoelectric module can be used for cooling or power generation. The basic requirements to achieve a significant thermoelectric performance are the same for both generators and coolers. Thermoelectric modules with Bi₂Te₃ materials are usually employed in the cooling applications below room temperature but it can also be used for the power generation in the similar temperature range. In the present study, the power generation with a Bi₂Te₃ thermoelectric module has been investigated. The temperature difference between the hot and cold sides of the module is maintained with electric heater and cold water from the circulating water bath. The result shows that the electric current generated increases with temperature difference and decreases with the load resistance. However, the voltage increases with both the temperature difference and load resistance. The electric power increases with temperature difference and it has the maximum value when the load resistance is about 4 Ω for a given device.
이공훈(Kong Hoon Lee),김욱중(Ook Joong Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The three-dimensional numerical analysis has been carried out to figure out the performance of the thermoelectric micro-cooler. The small-size and column-type thermoelectric cooler is considered. It is known that tellurium compounds currently have the highest cooling performance around room temperature. Thus, in the present study, Bi₂Te₃ and Sb₂Te₃ are selected as the n- and p-type thermoelectric materials, respectively. The thermoelectric leg considered is several 10-micrometer thick. The thickness of the leg may affect the thermal and electrical transport through the interfaces between the leg and metal conductors. The effect of parameters such as the temperature difference, the current, and the cooling power on the performance of the cooler has also been investigated for the thermoelectric micro-cooler.
이공훈(Kong Hoon Lee),김욱중(Ook Joong Kim),김종률(Jong-Ryul Kim),이상열(Sang-Ryoul Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The drying model has been used to obtain the fundamental information required to design the heat pump dryer with the simple thermodynamic model. In the model, the input conditions are crucial to obtain the acceptable results. The model includes one-stage heat pump cycle, simple drying process using the drying efficiency. The drying efficiency is defined with the conditions of inlet and outlet in the dryer. The experiment has been carried out in the pilot dryer with one-stage heat pump cycle. Refrigerant 134a is used in the heat pump cycle. In the dryer, some of drying air flows through the heat pump system and the rest of air bypasses the heat pump system and circulates through the drying chamber. Some operating conditions from the pilot dryer are used as input conditions of the model and the results are compared with experimental results for the validation.
이공훈(Kong Hoon Lee),최병일(Byungil Choi),홍용주(Yong-Ju Hong) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
A transient one-dimensional analysis using a simple model has been carried out to figure out the heat transfer characteristics in the dryer using the principle of the refraction of radiation. The dryer is composed of hot water tank, a plastic film conveyer belt, drying material, etc. The model considers the conduction and radiation within the plastic film and drying material. The film is semitransparent to radiation and the drying material is assumed to be semitransparent or opaque to radiation. The results are shown with the parameters such as heat transfer coefficient on the material surface, water temperature, relative humidity, and film thickness.
원통 형상의 슬러지 박막 건조에 대한 박막 두께의 영향
이공훈(Kong Hoon Lee),김욱중(Ook Joong Kim) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Thin film drying is specially designed and used to dry the viscous materials like sewage sludge. The thin film layer of sludge is dried on the metallic cylindrical surface using thermal energy transferred by conduction during drying. The wall temperature is assumed to be constant during drying in the present study for the simplification. In order to solve the equations, the mass transfer rate on the drying surface should be determined. The mass flux of evaporated water vapor on the surface is estimated with the formulation given in the literature. The effect of sludge film thickness on drying has been investigated to figure out the drying characteristics of the sludge layer.
순환 공기 유량의 변화를 고려한 열펌프 건조기의 성능 해석
이공훈(Kong Hoon Lee),김욱중(Ook Joong Kim),이상열(Sang-Ryoul Lee) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.1
The simulation of a heat pump dryer has been carried out to figure out the effect of air flow rate on the drying performance represented by MER, SMER, and so on. The simulation includes the analyses of one-stage heat pump cycle and simple drying process using the drying efficiency. The heat pump cycle with Refrigerant 134a has been considered. In the dryer, some of drying air from the drying chamber flows through the heat pump system, the rest of air bypasses the heat pump system. The two air flows joins before the drying chamber inlet. The performance parameters considered in the present study are MER, SMER, the temperature and humidity of drying air. Those parameters are compared for different total air flow rate or bypass air flow rate.