Papers by Chetan Mamulkar
International Journal for Research in Applied Science and Engineering Technology
Air conditioning, often abbreviated as A/C (US), AC (US), or air con (UK), is the process of remo... more Air conditioning, often abbreviated as A/C (US), AC (US), or air con (UK), is the process of removing heat from an enclosed space to achieve a more comfortable interior environment (sometimes referred to as "comfort cooling") and in some cases also strictly controlling the humidity of internal air. Air conditioning can be achieved using a mechanical 'air conditioner' or alternatively a variety of other methods, including passive cooling or ventilative cooling. Air conditioning is a member of a family of systems and techniques that provide heating, ventilation, and air conditioning (HVAC). Heat pumps are similar in many ways to air conditioners, but use a reversing valve to allow them to heat and also cool an enclosed space. Air conditioners, which typically use vapor-compression refrigeration, range in size from small units used within vehicles or single rooms to massive units that can cool large buildings. Air source heat pumps, which can be used for heating as well as cooling, are becoming increasingly common in cooler climates. According to the International Energy Agency (IEA), as of 2018, 1.6 billion air conditioning units were installed, which accounted for an estimated 20% of electricity usage in buildings globally with the number expected to grow to 5.6 billion by 2050. The United Nations called for the technology to be made more sustainable to mitigate climate change and for the use of alternatives, like passive cooling, evaporative cooling, selective shading, windcatchers, and better thermal insulation. CFC and HCFC refrigerants such as R-12 and R-22, respectively, used within air conditioners have caused damage to the ozone layer, and HFC refrigerants such as R-410a and R-404a, which were designed to replace CFCs and HCFCs, are instead exacerbating climate change. Both issues happen due to the venting of refrigerant to the atmosphere, such as during repairs. HFO refrigerants, used in some if not most new equipment, solve both issues with an ozone damage potential (ODP) of zero and a much lower global warming potential (GWP) in the single or double digits vs. the three or four digits of HFCs.
International Journal of Thermodynamics
A phase change material (PCM) is an organic (or inorganic) chemical that may store and release th... more A phase change material (PCM) is an organic (or inorganic) chemical that may store and release thermal energy in latent form as it changes physical states. This investigation aims to see how phase transition materials influence the thermal efficiency of the solar dryer. For the performance analysis, three PCMs were used: paraffin wax, lauric acid, and palmitic acid. As drying material, 5 mm thick potato slices were employed. According to the computational results, the total input thermal energy for the dryer for paraffin wax, lauric acid, and palmitic acid was about 17.36 MJ, 18.46 MJ, and 17.76 MJ, respectively, for 2 kg drying mass. When paraffin wax, lauric acid, and palmitic acid were utilized, the overall efficiency of the dryer increased by about 87%, 40.2%, and 12.4%, respectively, compared to the conventional dryer. By comparing the results of simulations and predictions, it is concluded that paraffin wax is the best-performing PCM for solar dryers as the energy storage mate...
The heat from the sun, coupled with the wind, has been used to dry and preserve food crops for se... more The heat from the sun, coupled with the wind, has been used to dry and preserve food crops for several thousand years. Some crops, such as Chili, Bananas, Coffee Beans, timber, need to be dried before they can be used effectively. Sun drying has often developed into solar drying, where drying occurs is in an enclosed, ventilated area–often using polythene, acrylic or glass covering. Present work deals with design, fabrication of double flow solar dryer. Double flow solar air heater is the advanced modification of single flow solar air heater. In the single flow solar air heater, air flows through one side of copper plate whereas in the double flow solar air heater air flow from both side of copper plate and hence more efficient than any other kind of solar air heater.
heat from the sun, coupled with the wind, has been used to dry and preserve food crops for severa... more heat from the sun, coupled with the wind, has been used to dry and preserve food crops for several thousand years. Some crops, such as Chili, Bananas, Coffee Beans, timber, need to be dried before they can be used effectively. Sun drying has often developed into solar drying, where drying occurs is in an enclosed, ventilated area-often using polythene, acrylic or glass covering. Present work deals with design, fabrication of double flow solar dryer. Double flow solar air heater is the advanced modification of single flow solar air heater. In the single flow solar air heater, air flows through one side of copper plate whereas in the double flow solar air heater air flow from both side of copper plate and hence more efficient than any other kind of solar air heater.
Research Journal of Engineering and Technology, 2016
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Papers by Chetan Mamulkar