Papers by Keyword: High Humidity

Abstract: The paper deals with possibilities of application of hydrophobised waterproof walling system for construction of building bottom parts (socle walling) in area with higher risk of floods. The paper describes the results from the research in the field of hydrophobisation possibilities of ceramic shaped pieces and subsequent development of socle waterproof walling construction.

Abstract: Taiwan is located in the subtropical zone. The climate in summer is hot with high humidity. In order to establish a comfortable office, it needs a lot of active devices, such as: air conditioner to maintain the suitable indoor temperature and humidity. In this study, a business office in the South District Public Health Center, Taichung City is conducted. According to our findings for the office, although the measured indoor temperature was closer to a comfortable temperature during the winter, the occupants of the indoor space still felt excessively warm. By contrast, the occupants of the same space achieved thermal comfort during the summer. This implies that most of the office occupants preferred a cooler environment with a lower temperature. In addition, because the summers in Taiwan are humid and hot, the occupants of an indoor space tend to feel uncomfortable because of the high humidity regardless of whether the temperature is maintained in a comfortable zone. A lower temperature (approximately 21.2-23.9°C) indirectly reduces humidity, thereby making the occupants comfortable.

Abstract: This research was conducted to evaluate the strength and folding performance of polypropylene packaging samples, when exposed to hot air and high humidity condition. Three types of polypropylene samples were chosen, which were flat plastic, plastic with hinges, and plastic film. All of these samples were tested for tensile strength; except plastic with hinges that received additional test to evaluate the folding endurance. American Society for Testing and Materials (ASTM) D638 standard was applied to analyze the mechanical strength of these plastics. This standard was used to determine the value of stress, strain, and Young’s modulus. Each sample was exposed to different temperature settings, which were 20°C, 25°C, and 30°C for high humidity condition and 60°C, 65°C, and 70°C for hot air condition. As for the folding endurance test, the hot air temperatures were selected at 60°C, 65°C and 70°C and for the high humidity condition, the range of relative humidity were set at 50%, 55% and 60%. Based on the tensile test results, the values of stress and Young’s modulus were higher at higher humidity as compared with the values under hot air condition. However the strain value was the opposite of the stress and Young’s modulus, whereby the values started to deceive under high humidity condition, but kept on increasing under hot air condition. In folding endurance test, it was confirmed that the hinge performed better under hot air environment than high humidity. As the relative humidity increases, the average number of folding decreased from 3.00x10⁶ to 2.89x10⁶ cycles. In the other hand, thevalue of folding numbers increased from 3.34x10⁶ to 3.37x10⁶, with increasing temperature. In conclusion, through this performance analysis, the outcomes can be applied to other packaging materials and appliances, which are related to high temperature and high humidity condition.

Abstract: Folding endurance is very important in terms of the indication for durability and performance of plastics and papers. The objective of this research is to study the performance of polypropylene hinges with the influence hot air in the fabricated chamber and high humidity condition. The performance of this sample was analysed by using folding endurance tester with hot air chamber, adopting the Design of Experiment L9 (3⁴) Taguchi Method for the selected factors which are temperature, relative humidity, breaking time and motor speed. All of these factors were selected with a constant force. Based on the findings, the best combination of parameters which signify the performance of folding endurance test in humidity environment is 70°C for temperature, 60 N for relative humidity, 2 days of breaking time and 850 rpm for motor speed. As for hot air environment, the best setting is 70°C for temperature, 55 N for relative humidity, 3 days of breaking time and 700 rpm for motor speed. For Signal to Noise ratio, the result showed that the temperature was the most influential factor for humidity effects and hot air environment, whereby the Signal to Noise ratio value obtained for the humidity and hot air environment are 129.5 dBi and 130.5 dBi respectively. The conclusion of this research is the polypropylene hinges have performed better with hot air environment as compared with higher humidity environment condition.

Abstract: Significant stiffness reduction of the plate spring due to delaminations around the interwoven cloths could be prevented by using CFRTP (carbon fiber cloth and Polyethylene Terephthalate (PET)) rather than that by using CFRP (carbon fiber cloth and epoxy), when ultra high cyclic loading was applied to the plate spring under high humidity condition. To explain the result, the prediction model of stiffness reduction was introduced considering time-dependent crack propagation accompanying with creep deformation around the crack tip. Stiffness reduction of CFRP under high humidity condition was not only determined by cyclic crack propagation but also by time-dependent crack propagation accompanying with creep deformation around the crack tip. It was found that CFRTP was effective material of the plate springs on vibration conveyer for the uses under high humidity condition to prevent significant stiffness reduction, where the crack propagation accompanying with creep deformation should be prevented around the crack tip.

Abstract: Because of the seldom research on temperature and humidity measurement of gas with high temperature and high humidity, workers in steaming workshops judge the temperature and humidity of steam in steamers on their subjective experience, which limits the accurate control of temperature and humidity of steam in steaming boxes. In reaction to the difficult measurement of high temperature and high humidity gas, a kind of electronic device has been developed to solve the problem. Through ingenious design of programming in assembly language and of electronic circuit, the device can automatically start an on chip heating element to prevent steam from condensing, and display the high temperature and relative humidity of steam in steamers. It will be propitious to break through the shackles of subjective experience, realize small changes in the temperature and humidity of steam in steaming boxes, and provide a basis and premise for controlling and regulating the temperature and humidity of steam. In addition, it will play an important role in gearing down the hygroscopic agent dosage, reducing the production cost, conserving energy, protecting environment and improving the quality of steaming.

Abstract: This paper investigated the stiffness reduction of the plate spring made of CFRP (Carbon cloth and epoxy) subjected to ultra high cyclic fatigue loading under high relative humidity. For practical uses, this paper proposes a new design which prevents the significant degradation with stiffness change of the plate spring at high humidity. Remarkable stiffness reduction of the plate spring due to cracks and delaminations around inter layer could be prevented by using CFRTP rather than that by using CFRP, when ultra high cyclic loading was applied to the plate spring under high humidity condition.