I will do refrigeration and air conditioning hvac

Refrigeration and Air Conditioning (RAC) engineering is a specialized branch of mechanical engineering that deals with controlling environmental conditions and removing heat for preservation or comfort. It applies thermodynamics, fluid mechanics, and heat transfer principles to design systems that move thermal energy from a lower temperature region to a higher temperature region, defying natural heat flow. Refrigeration focuses on lowering and maintaining temperatures below the surrounding environment, primarily used for food preservation, medical storage (like vaccine chains), and industrial chemical processing. Air Conditioning involves controlling not just the temperature but also the humidity, purity, and distribution of air to create comfortable indoor environments for people (residential and commercial) or to meet precise specifications for sensitive equipment (data centers and semiconductor fabrication).