The Government of Indonesia has done some efforts to overcome energy crisis nationwide. Among them by issuing a policy as the Foundation for the development and improvement of the capacity of providing energy. The Government has issued a presidential instruction number 10 of the year 2005 on energy savings and last Presidential Instruction No. 2 of the year 2008 about saving energy and water. One of the implementation efforts of this energy crisis is overcome with effort saves energy consumption on the air conditioning with develop hybrids air conditioning, namely as the air conditioner at the same time to the water heating. This research is a new technology for energy saving of electricity. The purpose of this research is to produce a prototype of a hybrid energy efficient refrigeration machine that can be function simultaneously as the engine room air conditioner at the same time water heaters. Specific research targets to be achieved is the realization of a prototype of a hybrid air conditioning engine capacity 1.5 PK which can save energy around 60%. The method of research is the planning, creation, testing the performance of air conditioning machines of compression cycle steam hybrid.
This paper presents a study of experimental performance of solar still using reflector to produce fresh and salt water in the climate of Padang city, Indonesia. The solar collector is equipped with a reflector placed on the top of the cover with slope of 30º. Test results show that using reflector can increase temperature in the basin. Freshwater productivity also increases and speeds up time in producing salt. Average daily freshwater productivity increased by 16.8% during the testing period by adding reflector compared to solar still without reflector
This paper presents an experimental performance study of a stepped type solar still for processing seawater into salt and fresh water. Its performance was tested in Padang City, under Indonesian environmental conditions. The experimental setup this study consisted of a tank of seawater, solar distillation and distilled water storage tanks. The working principle is the distillation of sea water put into the basin to be heated with solar power. The water will evaporate and condense on the surface of the cover glass distillation, distillation of fresh water stored in the container. Warming in the distillation carried out continuously until the water evaporates and the depleted salt crystals formed in the basin. The result shows that the productivity of the solar still was highly affected by the increase in solar radiation and ambient temperature. The productivity was 176 gr salt and 3,662 ml water with the average solar intensity 566 W/m2. The time it takes to produce salt is fourdays.
Research on increasing the efficiency of power plant needs to be done because the cost of producing electricity is quite large. The biggest cost of the electricity production process is the cost of fuel. One way to reduce fuel consumption is to reduce the pressure of the condenser. By decreasing the condenser pressure, the steam turbine load will increase, and the efficiency of the power plant increases. Therefore, it is necessary to conduct research to analysis power plant efficiency, analysis the relationship between condenser pressure and powerplant efficiency, determine coal usage requirements. There sulting efficiency will be related to the energy generated. The higher the energy generated; the efficiency will also increase.
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