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Nowadays, solar powered air conditioning machines have made increasing progress as air conditioning systems are almost a must in every building in Indonesia. Indonesia is a tropical area that can receive sunlight all year round. This study examines the design and performance of a solar-powered air conditioning system that is integrated with a photovoltaic (PV) system consisting of PV panels, solar chargers, DC power controllers/inverters and batteries. This air conditioning system can be used in non-electrical areas. The first step in this research is the calculation of the cooling load for the space to be conditioned and obtained about 1 ton of refrigeration (3.52 kW). Based on this cooling load, a photovoltaic (PV) system has been estimated and constructed with the necessary connections. Data logging systems have been used to measure the temperature of the main components in the cycle such as the compressor inlet and outlet as well as the evaporator and condenser. The input power for the system as well as the coefficient of performance (COP) for the system under Indonesian climatic conditions are measured throughout the day. The coefficient of performance varies from 2.9 to 8.5 for the system and this result is compared with the performance of the conventional system. [ABSTRACT FROM AUTHOR]

This paper introduced a procedure for determining cooling load in the passenger carbody of a high-speed train. Since the high-speed train was operated in Indonesia, topography, e.g., elevation, and environmental conditions, e.g., relative humidity, wet and dry bulb temperature, were considered constant parameters. Latent and sensible cooling loads from seven sources were estimated by referring to a method of ASHRAE standard. A complete cooling load calculation procedure on high-speed train has been presented. A case study has also been carried out. From the case study, we analyze the profile of cooling load of high-speed train from every heat source. The results achieved that sensible cooling load dominated the total of cooling loads was about 60%. Ventilation and passenger's sources contribute about 37% and 25% of total cooling loads respectively, followed by the fan/motor as the third source. [ABSTRACT FROM AUTHOR]

Indonesia as a maritime country has enormous capture fisheries potential. On the other hand, the use of technology in catching and cooling fish catches is still very limited. This study aims to design a fish hold insulation for fishing vessels 5 Gross Tonnage as a solution in maintaining the freshness of the fish caught. Fishing boat using flat hull ship design has been used as a study case with the main dimension is length overall 8.2-meter, breadth 2.6-meter, draught 0.8-meter. Based on the calculation standards used, the fish hold insulation design is obtained of 4-meter length, 2-meter width and 1.5-meter height. From all existing load calculations, the total cooling load that must be provided by the evaporator to keep the fish hold room air temperature at 0 ° C is 472.4 Watt. [ABSTRACT FROM AUTHOR]

The study of district cooling implementation opportunity in Jakarta will be reported. Two alternatives of district cooling system were simulated for a building complex district of about 1 km2 area situated in Jakarta. The two alternatives were a conventional centralized chiller system (ALT 1) and a combination of water chillers, brine chillers and TES (thermal energy storage) system (ALT 2). The methodology of the study was based on the cooling load estimation of the selected district using Trace 600 software, continued with selection and sizing of the main equipment alternatives, complete with the life cycle cost analysis. The simulation was divided into 5 zones based on the chilled water distribution. There were 34 buildings in the district consist of 1 residential area, 1 supermarket, 1 expo building, 1 hospital, 2 schools, 2 malls, 13 apartments, 7 hotels, and 6 office buildings. The peak cooling load in this district was found to be 35.800 TR (ton of refrigeration). For ALT 1, the system used the water-cooled chiller consisted of 8 base chiller of 5.000 TR each, 8 cooling towers, 8 chilled water pumps, 16 condenser water pumps, and 18 chilled water distribution pumps. The maximum daily energy consumption was 1,500,300 kWh. With 10% interest rate and 10% profit margin in 15 years operational periods, the chilled water rent price was found to be 3.77 cents US$/kWh in the first year. Due to its lower investment and operational cost, higher IRR, simpler equipments and easier to operate, the conventional centralized chiller system (ALT 1) is preferred over the district cooling with thermal energy storage system (ALT 2). [ABSTRACT FROM AUTHOR]