선택한 단어 수는 입니다.
최소 단어 이상 선택하여야 합니다.
최소 단어 이상 선택하여야 합니다.
선택한 단어 수는 30입니다.
최대 10 단어까지만 선택 가능합니다.
최대 10 단어까지만 선택 가능합니다.
제안 방법
- The objective of the present study was to investigate the overall heat transfer coefficient of greenhouse covering materials with or without thermal screens commonly used in the country under external conditions by using the hot box method.
- 2. The experiments were conducted to measure parameters relating to the hot box and the external climate. Temperatures at different locations inside and outside the box were measured and averaged using six HOBO sensors (ONSET, USA).
- Temperatures at different locations inside and outside the box were measured and averaged using six HOBO sensors (ONSET, USA). For outside temperature two more HOBO sensors were set and their values also averaged in order to increase the accuracy of the measurements. The amount of heat loss dissipating through the hot chamber’s wall was calculated by using the surface temperatures of the inner and outer of three walls measured by surface temperature sensors (UE1530, Korea).
- The hot box was designed, built, and exposed to external weather conditions to determine the overall heat transfer coefficient of different plastic film with or without thermal screens depending on shelter. The experiment was made on the test conditions of eight treatments combined covering materials and thermal screens with and without shelter from the sky radiation in dry condition. It was found that the inside temperature of the hot box was well controlled and stable around the predetermined setting temperature according to the energy supplied.
대상 데이터
- The trial was carried out at night, when the system was close to a steady state and the external climatic conditions were stable (usually between 01:00 h, and 05:00 h) (Feuilloley and Issanchou, 1996). The measurement data were recorded from December 1, 2011 to April 20, 2012. The wind velocity was measured at the College weather station near the experiment place.
- Table 1 shows the test conditions of eight treatments combined covering materials and thermal screens with and without shelter from the sky radiation used to determine the overall heat transfer coefficient. Covering material was polyethylene film and its thickness was 0.1 mm. Covering method was one layer and two layers by PE film.
- 5 m・s-1. Covering material used was polyethylene plastic film of 0.1 mm thick sheets. The inside temperature range was between 10.
- Feuilloley and Issanchou (1996) carried out external experiment by using two isothermal hot boxes. A series of 6 films in wet and dry conditions were tested. All the films were made of low density polyethylene and their thickness was 0.
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