Abstract. Most traditional village houses uses corrugated zinc roofing due to economic reason. Thermal discomfort will result as zinc is a highly heat absorbing material. The space under the zinc covering will experience significant temperature increase proportional to the amount of supplied heat from sunlight, and this will further be aggravated if the ventilation is poor. The purpose of this study is to determine an alternative method to lower the temperature inside a zinc covered house. The proposed method is by splashing water throughout the area of the zinc roofing, where heat exchange process will occur upon contact. The process will dissipate heat from the zinc but will increase the water temperature. Heated water will then free fall by gravity into a tank through perforated tube with very fine apefture, as water droplet. By the same heat transfer process, ambient air will lower the water temperature, which will be recirculation back to the roof. To facilitate higher rate of water cooling, fan will be provided. The tests show the system was able to lower the temperature of the zinc covered house, and can reduce cost of cooling, thus suitable for low income rural population in Malaysia.
Abstract. Dynamic probing is a continuous soil investigation technique, which is one of the simplest soil penetration test. It basically consist of repeatedly driving a metal tipped probe into the ground using a drop weight of fixed mass and travel. Testing was carried out continuously from ground level to the final penetration depth. Once the soil investigation work done, it is difficult to pull out the probe rod from the ground, due to strong soil structure grip against probe cone and prevent the probe rod out from the ground. Thus, in this case, a tool named Extracting Probe was created to assist in the process of retracting the probe rod from the ground. In addition, Extracting Probe also can reduce the time to extract the probe rod from the ground compare with the conventional method. At the same time, it also can reduce manpower cost because only one worker involve to handle this tool compare with conventional method used two or more workers. From experiment that have been done we found that the time difference between conventional tools and extracting probe is significant, average time difference is 155 minutes. In addition the extracting probe can reduce manpower usage, and also labour cost for operating the tool. With all these advantages makes this tool has the potential to be marketed.
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