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Electricity requirements and demands in the use of air conditioning from year to year are increasing. Along with the development of technology, various studies have been made in energy saving. One of the energy options is solar energy because the source is easily available and will never run out. For this research, the three main objectives to be achieved are to develop experiment setup of air-conditioning by using solar PV as power supply into AC system without battery storage, to measure reading of power usage and temperature and to make a comparison between the usage of common electricity and solar PV power. The methodology of this research will involve three main processes which are the development of Solar AC setup, running the experiment and data collecting and data analysis and discussion. In this study, it will be focused on developing the experimental setup of the overall research. The expected result of this research, the main objectives will be achieved and prove that the system will function well and give good result compared to common electricity air conditioning system. [ABSTRACT FROM AUTHOR]

Alloy of aluminium Al 7075 is a popular alloy with excellent mechanical qualities including hardness and weldability. It is widely utilised as in aircraft and automobile industries for a variety of functions. The effectiveness of Al2O3 nano cutting fluid in Turning operation on Al 7075 aluminium alloy with Minimum quantity lubrication cooling technology is the topic of this research. Cutting temperatures, surface finish, and tool wear was examined in relation to nano concentration, feed rate, and cut depth. The CNC lathe machine was computerized with a feed rate of 0.1 to 0.3 mm/rev and a depth of cut of 0.3 to 0.9 mm. The nozzle pressure on the MQL is kept fixed at 0.5 MPa. After that, the cutting performance of Al2O3 nano cutting fluid at 3 volume concentrations (0, 2, and 4%) was compared to MQL coolant, flood, and dry cooling techniques. Previously, Al2O3 was dissolved in a one-step process in a CNC conventional coolant base. The experimental task was designed utilising the response surface method (RSM) using Face Centered Design (FCD) and the variance analysis (ANOVA) to identify whether parameters are considered significant. Visual sedimentation and UV-Vis spectrometer are used to determine the stability of Al2O3 nano cutting fluid. When Al2O3 nano cutting fluid with a 4% volume concentration is used, the testing result gives the minimum cutting temperature of 28.9°C, the smallest value of surface roughness Ra of 0.547m, and tool wear of 0.0335 percent. The researchers came to the conclusion that the greater the Al2O3 nano cutting fluid volume percentage, the lesser the cutting temperature, the finer the surface roughness quality, and the longer the tool life. Future research should use a longer cutting duration, a quicker feed rate, and a deeper cut depth to achieve more meaningful results. When compared to dry cutting, flood machining, and MQL machining paired with conventional cutting fluid, the effectiveness of Al2O3 nano cutting fluid in respect of cutting temperature, surface finish, and tool life is found to be better. [ABSTRACT FROM AUTHOR]