Eco Cooler for Cooler House without Electricity for Educational Purposes

© 2021 Kantor Jurnal dan Publikasi UPI Article History: Received 25 Jan 2021 Revised 08 Feb 2021 Accepted 11 Feb 2021 Available online 11 Feb 2021 ____________________ Keyword: Desain, Eco-cooler, Education, Temperature. Indonesian Journal of Multidiciplinary Research Journal homepage: http://ejournal.upi.edu/index.php/ IJOMR/ Indonesian Journal of Multidiciplinary Research 1(1) (2021) 55-58 Riyanto & Nandiyanto, The Effectiveness of Distance Teaching and Learning... | 56 DOI: http://dx.doi.org/10. 17509/xxxxt.vxix pISSN 2776-608X eISSN 2776-5970


INTRODUCTION
Based on BMKG, the earth's temperature from 1981 to February 2021 has relatively increased (Ongoma et al, 2021). The increase in temperature on earth has made many people choose to use air conditioning so that the temperature in their homes is not too cold. This is in accordance with the IEA's article in The Future of Cooling report which states that energy demand from air conditioning worldwide will be three times as much in 2050 (Isaac et al, 2009).

METHODS
The research method that we used in this study was a critical literature review. There us some articles from some journals, some YouTube videos, and also some news article.

Brief History
Bangladesh has implemented a system called the Eco-Cooler. The Eco-Cooler is an innovation to solve the problem of high temperatures in Bangladesh, which is aimed at people who cannot afford to buy air conditioning equipment. The use of this Eco-cooler aims to reduce indoor air temperature without using electrical energy (Mendi et al, 2020)

Work Principle
The working principle of this eco cooler can be explained by two scientific theories (See Figure 1). The first is continuity theory. Continuity theory explains that the surface area affects the fluid (air) that flows even though the volume of fluid (air) entering is the same as the air that is leaving. The air that comes out at the mouth of the bottle will go fast (Ch & Mummina, 2018). This air velocity will cause the air pressure to be low and the air molecules will move more slowly so that no collisions between air molecules occur. As a result, less heat is created, the temperature will feel cooler. This decrease in air pressure at the mouth of the bottle is in line with the second theory, namely Bernoulli's theory which states that "where the velocity of the fluid flow is high, the fluid pressure will be low" (Ch & Mummina, 2018).

Desain Eco-Cooler
Nozzle is a part designed to control direction and modify fluid flow (Figure 2). The nozzle is usually a tube pipe. The size of this nozzle can affect the air produced by the eco-cooler. To get optimal results we can choose a bottle that has a small nozzle (bottle cap) size (Ch & Mummina, 2018).
The recommended bottle body size is ± 6 cm in diameter because it is easy to find. The more bottles used, the greater the decrease in air temperature produced by the eco-cooler. The eco-cooler design that has been successfully implemented is a bottle that has a diameter of approximately 6 cm which is placed on a board measuring 48 x 48 cm. This design has been proven to be effective in reducing the temperature by 1-3℃ in a room measuring 4.2 × 3.1 × 3.3 3 (Kasantikul, 2020).

The Advantages
There are several advantages: 1. Easy maintenance, only need to change the water in the box 2. Easy to move 3. The air becomes damp 4. Save electricity If the home of the AC user has a maximum power of 1300 VA at a rate of Rp1,444.7/kWh and uses AC with 600 watts of power which is turned on for 12 hours every day within a year. 600 × 12 hours = 7200 watts = 7.