The initial study has found several fundamental problems related to the professionalism of vocational teachers. These problems are in the form of 1) unequal teachers in getting the opportunity to participate in competency improvement programs; 2) lack of awareness in conducting research; 2) lack of desire to write articles and teaching materials, and 3) low level of desire to design instructional media in the field of mechanical engineering expertise. The objectives of this study were to 1) test the efficiency and effectiveness of the capacity building model; 2) find the determinants of success in professional development, and 3) produce a model for professional development of vocational teachers in the field of mechanical engineering expertise through effective and efficient capacity building. This study uses the Research and Development method. The subjects in this study were teachers in the field of mechanical engineering expertise in Bireuen Regency, the principal, two education management experts, and two mechanical engineering vocational education experts. Data collection techniques used in this research are through observation, interviews, FGD, documentation and questionnaires. Based on the research results, it can be concluded that the teacher capacity building model can improve teacher professionalism. These activities are carried out through the formation of learning communities, virtual self-education, writing, critical development groups, peer assistance, teacher exchanges, further studies, congregational action research, conferences and seminars, and ongoing training.

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Solar collector is a device that serves to collect the incoming solar energy and convert it into energy which in turn forwarded to the working fluid. A great systemof solar collector is a solar collector which has high efficiency, this means, most of heat energy that absorbed the collector can be used to water heater that flows inside and a small portion of heat energy is lost to the environment. In this study, the model of solar collectors has been modeled and heat transfer process to the solar collector solved by using software Engineering Equation Solver (EES). Iteration method is used to determine surface temperature in order to get useful heat energy on the collector. The solar collector simulated is measuring 1m x 2m x 0,06m, assumed absorber plate is aluminum and zinc plate size 0.4 mm and 0,6mm. The simulation results obtained fluid out temperature by using aluminum as the absorber is much higher than using zinc plate as the absorber plate. The fluid out temperature using aluminum plates as an absorber measuring 0.4 mm is higher than the plate size of 0.6 mm. The temperature of out fluid by using a copper pipe is larger than using a metal pipe for flat plate collectors for copper pipe that has higher thermal conductivity than the steel pipe. The simulation results are compared with the results of testing and the fluid out temperature of the test results is obtained less than the simulation results using the collector pipes and absorber plate of the same.

Heat exchanger expected to high effectiveness of heat transfer. Type of plate heat exchanger was more efficient compare to another heat exchangers in industrial applications with pressure less than 30 bar. The increased velocity of cold fluid flow has an impact to increase the performance of heat exchanger by  heat transfer rate (Q), heat transfer coefficient (U), and the effectiveness of heat exchanger (ε). The increased velocity of cold fluid flow also incresing the heat transfer rate. The study carried out by variation of the cold fluid velocity at 0.03 m/s, 0.037 m/s, 0.045 m/s, 0.051 m/s and 0.059 m/s. Inlet hot fluid temperature (Th,i) at 45°C and cold fluid temperature (Tc,i) at 27°C constant. The results shows Q value from the original 1570.71 Watt to 1916.16 Watt on the hot side and 1751.89 Watt to 2187.01 Watt on the cold side. The U value from the original 1180.46 W/m2.°C becomes 1408,75 W/m2. °C. The ε value increased from 60.33% to 75.69%. The increasing of  cold fluid velocity directly proportional to the the heat transfer rate (Q) and performance of the plate heat exchanger. This Phenomenon due to the faster circulation of the cold fluid, which causes the cold fluid to quickly return to its initial temperature (Th,i), an than increasing the plate heat exchanger's performance.