3.2. Electric production system
ORC system design is using R123 as organic fluid. R123 was chosen because it has properties in
accordance with the terms of ORC fluid selection. The result of the SPTC system using the ORC system
for 10 kW electric production systems is shown in Table 2. As we seen in Table 2, ORC thermal
efficiency is 10.63%. This happens because the system works at low temperatures, so that the difference
between the heat (evaporation) and cold (condensation) temperature is small.
The result of power estimation for solar parabolic trough collector power plant based on Fig. 2 shows
in Fig. 5. Fig. 5 shows a series of estimated power from each system of concentrated solar power. The
electric power output of 10 kW would be generated from 214 kW of solar collector. In addition, the fluid
inside the absorber is expected to reach temperatures of 200°C. The resulting efficiency is lower than the
Archimede models, because of the low heat source temperature. Some local content of material and
technology have been used in this work. Simple and cheap black-Zn coating was deposited onto some
absorber pipes. Palm oil was used as heat transfer fluid other than thermal oil. The palm oil was selected
because they have similar physical properties with heat transfer fluid as well as cheaper in cost.
Table 2. The ORC system design with 10 kW electrical output