10 publications
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Waste Heat Driven Hybrid Refrigeration System: A ReviewBy D. K. Joshi
Abstract: The objective of this paper is to describe a newly-developed hybrid refrigeration system .This hybrid refrigeration system , combination of a vapor compression refrigeration system driven by the high grade electrical energy and heat driven an absorption refrigeration system .Absorption system activated by waste heat available from the condenser of vapour compression system to produce the required necessary temperature in generator to vaporize refrigerant. However an electrical heater in the …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 7, Issue 2, 2020 · pp. 49–57 Read article →
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Solar-driven Ejector Refrigeration Technologies: A StudyBy D. K. Joshi
Abstract: The objective of this paper is to provide a helpful literature study on solar-driven ejector refrigeration systems and to provide useful progress toward back ground and operating principles of ejector. The development history and up to date improvement in solar-driven ejector refrigeration systems are summarized. It shows that solar-driven ejector refrigeration technologies are not only fulfill the needs for different purposes like cooling requirements such as air-conditioning and ice-making and …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 7, Issue 2, 2020 · pp. 29–37 Read article →
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Vortex Tube Refrigeration System under Different Working Parameters: A StudyBy D. K. Joshi
Abstract: AbstractThe vortex tube is a small, likable, and marvelous mechanical device used as refrigeration machine. Vortex tube is a device having no moving parts that separates the high pressure stream flow into two streams namely hot and cold at defined pressure. At the separation of two streams, one stream rejects the heat and becomes colder while the other receives the rejected heat and becomes hotter as compared to previous one. …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 4, Issue 3, 2017 · pp. 7–12 Read article →
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Commercial refrigeration using CO2 as refrigerant- A StudyBy D. K. Joshi
Abstract: AbstractToday, CO2 refrigeration and heat pumping technologies are recognized as workable and sustainable alternatives for a number of applications like commercial refrigeration, transport refrigeration, vehicle air conditioning, domestic hot water heat pumps and few industrial applications. This study gives an overview for the development possibilities for several applications during the next years. In next coming few years, an increase of market share for CO2 refrigeration and heat pump systems can …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 4, Issue 3, 2017 · pp. 1–6 Read article →
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Energy Efficiency in Mobile Air-Conditioning—A SurveyBy D. K. Joshi
Abstract: Abstract In the past decades, it has been observed a significant increase in the global production of vehicles. This situation is more visible in developing countries, like India, Many of these automobiles are equipped with mobile air-conditioning (MAC) systems in order to improve the comfort and security of the occupants. In contrast to these positive characteristics, the MAC systems are also responsible for greenhouse gas emissions and an increase of …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 4, Issue 2, 2017 · pp. 1–12 Read article →
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Refrigerant for the Future Carbon Dioxide: A StudyBy D. K. Joshi
Abstract: Abstract Tough environmental laws and strict government policies has brought radical changein the refrigeration sector, particularly relating to the liquid/or gas known as the refrigerant. It has been observed that only natural refrigerants are environmentally quiet.When other refrigerant qualities are measured, especially those relating to toxicity and flammability, looking to the properties of other refrigerants, carbon dioxide comes out as the best among the natural refrigerants. In the background of …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 4, Issue 1, 2017 · pp. 18–29 Read article →
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Performance Improvement of Air Cooled Condenser of Split Air Conditioner: A StudyBy D. K. Joshi
Abstract: Abstract Running residential or commercial split type air-conditioners plays a vital role for increasing electrical energy consumption in large quantity. While considering the performance of air conditioning system or specific energy consumption which is to be considered, as a function of condenser, compressor and evaporator performance respectively. By improving the heat transfer efficiency of the condenser performance improvement can be achieved, which helps in reducing electrical consumption. In the present …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 3, Issue 3, 2016 · pp. 35–44 Read article →
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Air Conditioning Systems: A Challenge to Climate ChangeBy D. K. Joshi
Abstract: Abstract Demand for air conditioning is growing speedily especially in developing countries (South-East Asia) due to income growth, population growth and the need for better comfort level to protect from heat exposures. Only few models estimated future air conditioning use in major areas with increased heat level. However, worldwide and local studies concerning climate variables with air conditioning alone are lacking when facing additional heat due to climate change. More …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 3, Issue 2, 2016 · pp. 1–7 Read article →
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Absorption Refrigeration System through Solar Energy: An Over ReviewBy D. K. Joshi
Abstract: Abstract Recently, types of traditional energy have failed to satisfy the human needs due to their limited quantity as well as their negative environmental impacts. Conventional refrigeration systems mainly based on vapor compression system are major electricity consumers and their refrigerants are being banned by international legislation. It was studied that out of the total energy consumption, a large portion of energy is being used by conventional refrigeration systems. From …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 3, Issue 1, 2016 · pp. 11–22 Read article →
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Evaluation and Optimization of an Aqua-Ammonia Vapor-Absorption Refrigeration SystemBy S. P. Singh, D. K. Joshi
Abstract: The process parameters of ammonia-water absorption system were optimized in terms of temperatures of generator and condenser and heat ratios of generator-to-condenser and generator-to-absorber. The iteration method was used to get the variation in generator and condenser temperatures with coefficient of performance (COP) for the fixed evaporator temperature. The sizing of generator, absorber and condenser was found from the variation of heat ratios of generator-to-condenser and generator-to-absorber for the fixed …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 1, Issue 1, 2014 · pp. 9–17 Read article →