• Fire Science and Engineering
• /
• v.28 no.6
• /
• pp.76-81
• /
• 2014

The purpose of this study was to comparative analysis of tidal volume and airway pressure after one-rescuer BVM, two-rescuer BVM, advanced airway devices with a Bag-valve mask using RespiTrainer. The data were obtained from June 2 to 10 in 2014. The collected data were analyzed using the SPSS WIN 18.0 program. The results showed that BVM ventilation using the endotracheal intubation produced higher mean tidal volume $497{\pm}78mL$, Two-rescuer ventilation $479{\pm}91mL$ One-rescuer ventilation $386{\pm}59mL$, King LTS-D $365{\pm}05mL$, Laryngeal mask airway (LMA) $351{\pm}35mL$. Peak airway pressure was higher in BVM ventilation using the endotracheal intubation. As a result, the study confirmed that the BVM Ventilation by endotracheal intubation and Two-rescuer BVM ventilation to one third the bag depth squeeze method is appropriate.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.8
• /
• pp.5045-5050
• /
• 2015

As modern houses are constructed with high-density and high-insulation, there is benefit to reduce energy consumption, but there are many side effects raised from polluted air. To solve the problem, a ventilation system is used to improve a indoor air quality. In this study, we tested the parallel flow type heat exchanger used in a heat exchanger of an automotive air conditioner. And we experimentally estimate ventilation performance of HRV(heat recovery ventilator) with heat-pipe according to working fluid filling quantity and ventilation. The working fluid was R22, which was filled from 40 to 60 (%vol.) by 10(%vol.). Ventilation based on the front velocity was measured from 0.3 m/s to 1.5 m/s by 0.3 m/s intervals. Refrigerant filling quantity with the highest efficiency was found to depend on the ventilation. From this study the optimal refrigerant filling quantity in accordance with the ventilation of the detachable heat pipes was found experimentally.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2015.10a
• /
• pp.1027-1029
• /
• 2015

Heat exchange ventilation facility is using for heating the inflow outside-air with warm outflow inside-air. Energy cost is saved and respiratory disease caused by temperature difference of air is prevented. In this paper, system for remote control and monitoring of heat exchange ventilation facility is developed. This system is applied in chicken breeding farm, and verification test of performance such as temperature and humidity control and monitoring is conducted. From verification test, temperature control error is measured as under 2degrees around the chicken breeding farm.

• Journal of Bio-Environment Control
• /
• v.22 no.1
• /
• pp.7-12
• /
• 2013

Environmental measurements in the many different types of horticultural farms were carried out to evaluate the ventilation performance for multi-span plastic greenhouses according to the eaves height, the number of spans, the existence of side wall vents and the position of roof vents. Hydroponic tomatoes were being cultivated in all experimental greenhouses, and ventilation rates of the greenhouses were analyzed by the heat balance method. It showed that the ventilation rate in the greenhouse with 4 m eaves height increased about 22% compared to the greenhouse with 2 m eaves height. The ventilation rate in the greenhouse with 9 spans decreased about 17% compared to the greenhouse with 5 spans. In the greenhouse with 9 spans, if there were no side wall vents, the ventilation rate showed about a third of the case that side wall vents were open. Overall, as the eaves height was higher and the number of spans was smaller in multi-span greenhouses, the natural ventilation performance was better. And the ventilation performance was best in the greenhouse which the eaves height was high and the position of roof vents was ridge, not gutter. Therefore, in order to maximize the natural ventilation performance, multi-span plastic greenhouses need to improve their structures such as that make the eaves height higher, place the roof vents on the ridge, install the side wall vents as much as possible, and the number of spans is limited to about 10 spans.

• Journal of Bio-Environment Control
• /
• v.9 no.4
• /
• pp.201-206
• /
• 2000

A certain system to overcome high temperature should be introduced for the stable year-round cultivation in greenhouses. There are efficient methods to overcome high temperature such as ventilation system with shading screen, fan and pad system with screen, and fog system with screen. This study was carried out to find a means to determine the capacity of such system. Heat balance equations for each system were established and verified by experimental results. The calculated ventilation rates from heat balance equations showed a good agreement with the measured ones. The evapotranspiration coefficient was the most important parameter affecting the ventilation requirement among input parameter affecting the ventilation requirement among input parameters except weather data. When the evaportanspiration coefficient increased 1%, the ventilation requirement decreased 1.3%. Therefore the data of evapotranspiration coefficient should be accumulated by various experiments, and then design standards and selection guidelines should be provided. The simulation results for same design conditions shown that air exchanges requirement and evaporating water of fan and pad system were 5.1∼7.7% and 6.8∼9.3% larger than those of fog system, respectively.

• Korean Journal of Organic Agriculture
• /
• v.22 no.1
• /
• pp.147-154
• /
• 2014

Spinach downy mildew caused by Peronospora spinaciae is the main reason of yield reduction in Korea as well as in worldwide. After forced ventilation or horizontal air circulation fans were installed to control growth conditions in green house, the changes of temperature, relative humidity (RH), growth and yield, and occurrence of downy mildew were examined. Althought here was no significant difference of temperature between the treatments, RH as 9.2% lower at nighttime by forced ventilation. In addition, final fresh weight was increased to 17.8g compared to control (10.1g), which as 7.7g enhancement. Downy mildew s tarted to show 20 days after sowing (DAS) and increased to 34.7% at 60 DAS on harvest time in control. In contrast downy mildew was occurred 40 DAS with 0.7% incidence rate and 4% at harvest by forced ventilation. The results indicated that reduction of only 9.2% of RH at nighttime by forced ventilation in greenhouse spinach growth was dramatically thrived over 76.2%. Additionally spinach downy mildew occurred 20 days later with extremely lower incident rate, which meant 88.5% reduction of downy mildew.

• Journal of Bio-Environment Control
• /
• v.32 no.3
• /
• pp.197-204
• /
• 2023

Heat stress causes a decrease in immunity and disease occurrence in livestock, increasing mortality and impairing productivity. In particular, chickens are very vulnerable to high temperatures compared to other livestock species because their entire body is covered with feathers and sweat glands are not developed. Currently, air conditioning systems are essential in broiler houses to prevent high-air temperature damage to broilers, but conventional cooling facilities are greatly affected by the external environment, so there are limits to their use. In this study, to propose a cooling method, thermal insulation paint and a heat pump were apply in the broiler houses to evaluate the temperature reduction effect. The heat pump experiment was to analyze the cooling effect according to the change in ventilation rate and propose an appropriate. As a result of the experiment, the heat-insulating paint reduced the temperature of the broiler houses by maximum 1-2℃, and in the broiler houses where the heat pump was operated, the temperature decrease was the largest when the ventilation rate was the lowest. When the air temperature in the house is similar to or lower than the outside air temperature, it is considered to be most effective to use a heat pump while maintaining only the minimum ventilation rate.

• 월간낙농육우
• /
• v.34 no.8
• /
• pp.108-112
• /
• 2014

농장에서의 혹서기를 위한 환기관리 포인트란 무엇일까? 우선 우사는 개방식 축사이기 때문에 햇빛과 바람 관리만 잘 해도 우사 환경은 개선되는데, 계절적으로 혹서기로 접어들면서 소가 더위에 시달리며 높은 온 습도에 의하여 사육하기가 힘들다는 농가가 많다. 특히 환기는 외부의 기상조건과 소의 사육단계 등을 근거로 단열 수준과 환기량을 결정해야 한다. 그리고 온 습도 뿐만 아니라, 풍속 풍향 등의 기류 상태 및 세균, 먼지, 탄산가스, 암모니아가스, 냄새 등 생물 화학적 상태를 적절한 수준으로 유지해야 소의 생산성과 사료효율을 최적화 할 수 있다. 따라서 본 원고에서는 혹서기 시설 및 환경관리를 통한 여름나기 축사환기 관리방법에 대하여 알아보고자 한다.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
• /
• v.29 no.10
• /
• pp.44-46
• /
• 2000

자연환기를 건물에 적용하는 주된 목적은 "실내 환경수준을 충족시키기 위해 필요한 초기투자 및 유지비용을 절감하기 위해서" 이다. 따라서, 합리적인 환경계획을 수립하기 위해서는 "자연환기를 적용하는 것이 유효한가\ulcorner 유효하다면 어떤 전략을 채용할 것인가\ulcorner" 하는 것이 계획단계에서 반드시 검토되어져야 한다. 설계자는 합리적인 판단을 위해서 다양한 정보를 필요로 하게되며 이 과정에서 다양한 해석도구가 이용될 수 있다. 본보에서는 자연환기 설계단계에서 요구되는 각종정보와 그 해석도구의 특성에 대하여 고찰해 보고자 한다.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 1999.10a
• /
• pp.81-82
• /
• 1999

풍압력 외의 외부에너지가 필요치 않아 에너지를 절약할 수 있고, 외기를 도입하여 실내를 쾌적하게 유지할 수 있다는 장점으로 인해 자연환기에 대한 관심이 높아지고 있다. 자연환기에 영향을 미치는 인자는 건물의 특성, 외기의 특성 등으로 매우 다양하며, 독립적으로 작용하지 않고 상호연관적으로 작용한다.(중략)