• Title/Summary/Keyword: temperature and humidity Control

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Development of Fuzzy Controller for Air Conditioning of Grain Bin (곡물빈용 공기조화장치의 퍼지제어기 개발)

  • 최영수;문대식;정종훈
    • Food Science and Preservation
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    • v.9 no.2
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    • pp.137-143
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    • 2002
  • Temperature and humidity are the most important factors and should be effectively controlled for the cold storage of graius. Fuzzy logic can be easily implemented to the MIMO(Multi-Input Multi-Output) control systems. For the cold storage in grain bin, fuzzy logic was applied to an air conditioning system. The capacities of the grain bin and the air conditioner are 80 tons and 30㎾, respectively. Also, the target values of temperature and relative humidity in outlet duct of the air conditioner were 8$\^{C}$ and 75%, respectively. In order to control temperature and relative humidity of air, a damper in inlet duct was manipulated for temperature control and a heater was used for humidity control. Temperature deviation and change of temperature deviation were used as input parameters for the fuzzy system. Humidity was only considered as a load. The experimental results showed that the controlled temperature of exhausted air was maintained at 8$\pm$2$\^{C}$. Relative humidity of the air was also controlled at the target relative humidity of 50∼80%.

Problem Solving about Practical Engineering Education based on Relationship of Temperature and Humidity in Vehicle (차량 내 온, 습도 관계에 의한 실천공학교육적 문제해결)

  • Kim, Jin-woo;Joo, Kangwo
    • Journal of Practical Engineering Education
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    • v.9 no.2
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    • pp.149-153
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    • 2017
  • Inside the vehicle, temperature and humidity are suddenly changed. Accordingly, HVAC System's temperature control is very complicated. But, clarifying the relationship between temperature and humidity can reduce the control parameters. Therefore, this paper describes the relationship between temperature and humidity in the vehicle and presents a problem solving method in terms of control technologyThe vehicle sensor monitors the factors required for vehicle control and plays a role in enabling optimal control from the obtained information. Of these sensors, the driving environment of the driver is determined by the temperature and humidity inside the vehicle, and the characteristics of the vehicle suddenly change rapidly. Accordingly, HVAC System's temperature control is very complicated. But, clarifying the relationship between temperature and humidity can reduce the control parameters. Therefore, this paper describes the relationship between the temperature and humidity in the vehicle, and presents a method for controlling the temperature and humidity in the vehicle as an example.

A Comparison Evaluation on the Indoor Temperature and Humidity Control Effect of Hwang-To Brick and Traditional Window as Exterior envelops in Mock-up Room (Mock-up 실험을 통한 황토벽과 전통창호의 실내 온습도 조절효과에 대한 비교평가)

  • Song, Min-Jeong;Shin, Hoon
    • KIEAE Journal
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    • v.10 no.6
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    • pp.131-137
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    • 2010
  • This study aims to know temperature and humidity handling ability of Hwang-To brick and traditional paper window's in mock-up room test. To achieve these goals, mock-up room test was carried out. The results are as follows. 1) There are no significant differences among specimen in temperature handling capacity. 2) Traditional paper windows are very sensitive when compared with glass window in humidity control. 3) Traditional paper windows have a big handling capacity in humidity control when vapors letting out in mock-up room. 4) Hwang-To brick case is more stable than other cases in relative humidity variances because it has more potential to contain humidity.

Studies on the cigarette hardness(II) The Influence of relative humidity, temperature and net weight on cigarette hardness (담배 경도에 관한 연구(II) 상대습도, 온도 및 진충량이 담배의 경도에 미치는 영향)

  • 정한주;민영근;김병구;김기환
    • Journal of the Korean Society of Tobacco Science
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    • v.13 no.1
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    • pp.13-18
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    • 1991
  • This experiment carried out to review influence of relative humidity, temperature and net weight on cigarette hardness for the uniformal control of cigarette quality. Obtained results are as follows: 1. The difference in the cigarette physical properties of constant hardness control is considerably lower than that of constant net weight control. 2. Contribution rate for cigarette hardness is relative humidity > net weight > temperature. 3. The multiple regression equation of cigarette hardness related with relative humidity, temperature and net weight is calculated as follows.

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Actuator multiple control method for greenhouse environment control system (온실 환경 제어시스템을 위한 액추에이터 복합 제어 방법)

  • Son, Kyo-Hoon;Park, Dae-Heon;Kim, Se-Han;Kim, Jae-Hyung;Jeung, Eun-Tae
    • Journal of The Institute of Information and Telecommunication Facilities Engineering
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    • v.11 no.2
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    • pp.39-45
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    • 2012
  • In recent years the USN(Ubiquitous Sensor Networks) technology has been applied in the greenhouse in order to control temperature and humidity automatically. In this paper, we proposed a control algorithm using feedback linearization techniques based on a mathematical model for temperature and humidity environment. Especially, Control algorithm is presented to the operation of the ventilator affecting on the temperature and humidity system at the same time. The System has been designed taking into account the disturbance(External temperature, soil temperature, external humidity, solar radiation and wind). In conclusion, I will present a way to control multiple actuator through simulations. The proposed control algorithm is validated using the Matlab/Simulink tools.

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Internal communication as CCTV Automatic Climate Control System Development (CCTV통신용 함체내의 항온항습 자동제어 장치 개발)

  • Kim, Hee-Chul
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.4
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    • pp.433-439
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    • 2015
  • Enclosures for CCTV internal short circuit are prevented due to wetting to maintain a constant humidity and temperature, to avoid condensation due to temperature difference, a constant temperature and humidity requirements of the equipment, such as high-temperature resistant and a constant temperature of the structure, degree of energy utilization is optimized for developing this corresponding housing automatic control system and humidity is required. Device being an expensive imaging equipment in side of the enclosure according to the temperature conversion from a hazard protection, there is a need for a constant temperature and humidity control apparatus that can prevent a short-circuit failure. This is a system in which the accessory device is absolutely required for the storage and transmission of an image in recording reliability and field conditions.

Development of a Fully-Controlled Phytotrons -Temperature and Humidity Control System- (완전제어형(完全制御型) 실험용(實驗用) 작물생육장치(作物生育裝置)의 개발(開發)(I) -온(溫)·습도(濕度) 제어(制御) 시스템-)

  • Lee, K.C.;Ryu, K.H.;Noh, S.H.;Hong, S.H.
    • Journal of Biosystems Engineering
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    • v.17 no.1
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    • pp.55-64
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    • 1992
  • The aim of this study was to develop a phytotron for studying the effects of environmental factors such as temperature and humidity on plant growth. This equipment consists of the growth chamber, and the measurement and control system including control algorithms required for optimum operation. As the first step of the study, a temperature and humidity control system was developed. The results of this study are summarized as follows ; 1. Pt-100 was selected to measure temperature and a linearized op-amp circuit was developed for signal conditioning. 2. Pt-100 wet bulb thermometer based on Asmann's principle was developed to measure relative humidity. 3. Temperature and relative humidity conditions were controlled by ON-OFF and PWM operation using a PID controller. And an autotuning algorithm using the characteristics of step response was developed to determine optimal PID constants which were independent of the size of apparatus and environmental factors. 4. Under the ambient temperature of $20^{\circ}C{\sim}25^{\circ}C$, the temperature was kept within the error of ${\pm}0.3^{\circ}C$ in the range of $10^{\circ}C{\sim}40^{\circ}C$, and the relative humidity was kept within the error of ${\pm}5%$ in the range of ${\pm}50%{\sim}90%$.

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Performance Evaluation of Water Vapour Adsorption & Desorption Properties of Low-Priced Generic Ceramic Panel Materials for Humidity Control - Focuses on analyzed measurements of temperature and humidity obtained from the housing units - (저가보급형 습도조절용 세라믹패널의 조습성능 평가 - 리빙랩 온·습도 모니터링 분석을 통한 실측결과를 중심으로 -)

  • Jang, Kun-Young;Ryu, Dong-Woo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.11a
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    • pp.39-40
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    • 2017
  • This study aims to evaluate the humidity control performance of low-priced generic ceramic panels that are used to control humidity. Temperature and humidity are monitored by using 'Living Lab' and the change of indoor relative humidity is measured and analyzed. According to the results of the study, the indoor relative humidity of rooms installed with ceramic panels was found to be low compared to that of living rooms by 2.2%RH (test period) and 3.2%RH (daily). In the case of maximum relative humidity, rooms installed with ceramic panels were found to be low by 6.9%RH. The results are attributable to the humidity absorption of ceramic panels. Accordingly, future ceramic panels need the improvement of performance and an appropriate construction area should be derived depending on indoor space.

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Development of an Environmental Control System for Agricultural Storage Facility (상온저장 시설의 환경 제어 시스템 개발)

  • 임종환;현명택
    • Food Science and Preservation
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    • v.4 no.2
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    • pp.101-113
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    • 1997
  • Temperature, relative humidity and ventilation are closely related one another, and they are the main factors to be controlled for the environmental control system of a storage facility. Conventional environmental control systems do not consider the interrelationship between temperature, relative humidity and ventilation, which results in low performance and high energy consumption. To overcome the inefficiency of the conventional ones, it was developed an on-off control system based on the interrelationship between the factors. The usefulness of the system was illustrated with the results produced by a set of experiments in a real world.

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Performance Increase for a 2 kW Open Cathode Type Fuel Cell Using Temperature/Humidity Control (2 kW급 개방 캐소드형 연료전지 출력 향상을 위한 온습도 제어)

  • YUAN, WEIWEI;CHOI, MIHWA;YANG, SEUGRAN;KIM, YOUNG-BAE
    • Transactions of the Korean hydrogen and new energy society
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    • v.28 no.4
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    • pp.369-376
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    • 2017
  • Temperature and humidity regulations of an open-cathode PEM fuel cell with balance of plant (BOP) are developed in this study. The axial fan, a bubble humidifier, set of solenoid valves and a controller are used to perform temperature and humidity control simultaneously. A fuzzy controller is designed, and it shows its superiority in real-time controlling for strong non-linear dynamical fuel cell system. The axial fan speed is used for temperature control and solenoid valve on/off signal of the bubble humidifier is used for humidity control. The axial fan speed is controlled to keep the fuel cell temperature within the desired point. Meanwhile, the bubble humidifier is utilized to moisture hydrogen to manage the water content of membrane. The results show that the proposed fuzzy controller effectively increases the output power of 10% for a PEM fuel cell.