No abstract

The temperature and drying conditions imposed on a product have an essential influence on it. Drying in high temperatures can cause damage the sensitive materials. To overcome this problem, in this paper, to show the effect of temperature, specific humidity and mass flow rate, on the specific energy consumption on the use of air heaters, and the combination refrigeration system to produce hot and dry air. In this study, we use an experimental method by using temperature variations of 60°C, 90°C, 120°C, and 150°C. Air mass flow rates using 100 Lpm, 150 Lpm, 200 Lpm, and 250 Lpm variation. The air from the environment is sucked up by the blower and then enters the evaporator. In the evaporator, the air will condensate so the air will get the low relative humidity. The heat in the condenser is used as preheating the dry air before entering the heater. To produce hot and dry air with the minimum humidity ratio (3.9 g / kg dry air) for the same target temperature is recommended to use a 100Lpm airflow rate by adjusting the evaporator pressure to 2.6 bar. Then, to obtain the minimum SECR (0.928), the recommended target temperature is 120°C, by adjusting the airflow rate to 250Lpm and the pressure at the evaporator 1.6 bar.

The ease of people in obtaining clean water is still a problem in Indonesia. The reason is that there are still more than 25% of the people who have not been able to use clean water to meet their daily needs. Indonesia was in the spotlight because it was considered as one of the countries that became the most significant contributor to water pollution, especially through plastic waste. The need for clean and safe water is growing as the population growth as well. Seawater desalination has become one of the essential commercial processes for providing clean water to many communities and industrial sectors that play an important role in socioeconomic development in several developing countries, especially in Africa and several countries in the Middle East. The region, which suffers from the scarcity of fresh water. This paper aims to simulate the processing of seawater into clean water ready for use. The source of heat that is use comes from the cooling water condenser of steam turbine power plants. The method to be used is a thermodynamic simulation by using temperature in the cyclone separator and the percentage of water discharged into the sea variation to find out the amount of aquadest production and the Specific Energy Consumption (SEC) in the system. The lower temperature in a cyclone separator, the more aquadest production. The more mass water discharged to the sea, the less SEC will obtain. The minimum SEC is-1137.62 kJ/kg aquadest for 0.86 kg/s aquadest at 99% of mass water discharge and 2.645 kPa pressure in the cyclone separator and then the higher SEC is 440.53 kJ/kg aquadest for 0.338 kg/s at 89% of mass water discharge and 0.706 kPa pressure in the cyclone separator. The effect of lowering the condenser pressure is to increase the power of steam turbine 1181.85 kW, and then the cooling water temperature of the condenser decrease from 37.5°C to 32.5°C. The cooling water of condenser will be discharged partially into the sea at 32.5°C, which is safe for the environment.

No abstract

No abstract