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Hybrid photovoltaic-thermal heat pump (PV/T-HP) solar energy systems are promising since they can achieve a system total efficiency greater than 80%. By maximizing the output of a PV/T system for simultaneous heating and cooling, this strategy can meet over 60% of urban households’ heating needs and around 40% of their cooling needs. In this work, a novel PV/T evaporator was designed, fabricated, and an aluminium foil encapsulated hydrated salt (HS36) PCM was integrated with the PV/T evaporator of the PV/T direct expansion heat pump system (PV/T-DXHP). Energy analysis was carried out on the PV/T-DXHP system with PCM in tropical climate regions of India for achieving net zero energy buildings. The experimental study revealed that the average PV electricity efficiency was 14.17%, which is near the PV panel’s STC value. The average thermal efficiency of the system was 104.38%, and the PV/T system’s average overall efficiency was 117.58%. The heating and cooling COPs of the system were 5.73 and 4.62, respectively. It was concluded that net-zero energy buildings are possible with the help of photovoltaic heat pump systems that use PCM and solar energy to make electricity, cool spaces, and heat water.

The effect of cutting performance was investigated using uncoated plain andtextured tungsten carbide tools in dry machining of carbon steel. Texture namely straight line,zigzag and plus profiles was created on flank face of the uncoated tungsten carbide tool. This textured tool was designed and fabricated by Neodymium-doped Yttrium Aluminium Garnet ND-YAG laser machine. Also it was evident with scanning electron microscopy analysis. In further design of experiment was carried by taguchi method by using L9 orthogonal array for varying cutting speed, feed rate, depth of cut to perform the machining experiment. The cutting force,surface roughness and cutting temperature were measured in which it depicts that microscale textured tools improves the machining characteristics to a greater extent when compared with untextured tool. It can be effective in all manufacturing industries provide an eco friendly environment since no coolant is required due to which it becomes pollution free.

The predominant aim of the research has been meant to evaluate cutting characteristic features of machining on AA6061/ZrB2-ZrC hybrid composite metal matrix with polycrystalline diamond tool. Though researchers understand, Taguchi would be used for dry turning operations to find the optimal cutting parameters. We have used the Taguchi L16 orthogonal array in the current investigation to evaluate the cutting characteristics. Through this work it’s analyzed that the optimal cutting as well as main cutting parameters actually affects the cutting performance. In order to understand the effectiveness of investigational optimization, confirmatory tests have been carried out hybrid composites fabrication composite has proved that it has better machining characterization. Hence, the fabricated composite can be recommended for applications especially hypersonic flight and rocket propulsion systems and because of the presence of hard ceramic material it is used commercially for the manufacture of cutting tools inserts.