Design and development of refrigerator using PCM based heat exchanger
Devendra Danotiya, Nitin D banker
June, 2014 -
Successfully implemented PCM based heat exchanger in a domestic refrigerator.
This was able to have ~ 15% of energy saving.
The Compressor exit temperature was lower for PCM condenser which will benefit the compressor life.
Numerical modeling of the PCM based heat exchanger also has been performed and compared with experimental results.
AN IMPROVED GAS TURBINE POWER PLANT (201811042871)
Inventors: Dr. Nitin D Banker, Dr. Devendra Singh Dandotiya. Filed November 14, 2018 in India
AN ENERGY EFFICIENT AIR CONDITIONING SYSTEM AND METHOD THEREOF (201811041530)
Inventors: Dr. Nitin D Banker, Dr. Devendra Singh Dandotiya. Filed November 02, 2018 in India
Performance Enhancement of a Refrigerator using Phase Change Material based Condenser: An Experimental Investigation
Published by (International Journal of Air-Conditioning and Refrigeration)
Authors: Devendra Dandotiya, Nitin D banker. Published November 09, 2017
Tropical countries like India, the ambient temperature reaches to 45–50 C in the summer and higher ambient temperature directly impacts the energy required by the household refrigerator. This paper presents an experimental performance of a domestic refrigerator incorporated with a phase change material (PCM)-based condenser in parallel to the conventional wire-and-tube air-cooled condenser for the climatic conditions of India. It is proposed to operate the refrigerator with the PCM-based condenser, while the ambient temperature is higher during the day, otherwise with the air-cooled condenser. Due to large latent heat storage capacity of the PCM, the condenser temperature would not increase significantly. The COP of the PCM-based condenser was 28% higher as compared to an air-cooled condenser for 60 min which reduces to 3 % as the PCM temperature reached to 33 C. The energy consumption is lower by ∼15% in of refrigerator experimentation with the proposed modification.
Numerical investigation of heat transfer enhancement in a multitube thermal energy storage heat exchanger using fins
Published by (Numerical Heat Transfer, Part A: Applications)
Authors: Devendra Dandotiya, Nitin D Banker. Published September 25, 2017
The application of a phase change material (PCM) as thermal energy storage observed unprecedented growth due to its large latent heat storage capacity at a constant temperature. However, the design of an energy storage heat exchanger is a challenging task because of the poor thermal conductivity of PCMs. In an effort to improve the heat exchanger design, this paper presents a numerical performance investigation of a PCM-based multitube heat exchanger incorporated with two new fin configurations. The analysis of the results shows that the placement of fins is one of the important aspects, which needs to be cogitated in the design of heat exchangers.
Gas Turbine Inlet Air Cooling Using Vapor-Adsorption Refrigeration Driven by Power Plant Exhaust
Published by (ASME Gas Turbine India Conference 2017)
Authors: varuneswara reddy panayam, Devendra Dandotiya, nnITIN d bANKER. Published December 07, 2017
Turbine inlet air cooling (TIAC) has long been the most commonly used method to improve the performance of gas turbine based power plants. It is particularly effective in regions with high ambient temperatures. With growing energy demands and higher ambient temperatures around the globe, it is important to look beyond cooling cycles like vapor-absorption and vapor-compression which have certain limitations. It is prudent to use a vapor-adsorption cycle for TIAC since the exhaust heat will be used as the power source for adsorption compressor, ultimately increasing efficiency of the power plant. Also, the scalability of adsorption cooling from mere Watts to hundreds of kW and its ability to function using lower temperature heat sources (as low as 60 degree Celsius) render it highly suitable for TIAC. In this work, a gas turbine power plant and a TIAC system running on vapor-adsorption cycle are mathematically modeled. Thermal analysis involving comparison of performance of the chiller and power plant with and without inlet air cooling at varying ambient and desorption temperatures is presented. Performance parameters analyzed include net power output of the power plant, PER and the COP of the chiller. The results show that vapor-adsorption system has huge potential to be integrated with gas turbine power plant for inlet air cooling.
Performance Improvement of Gas Turbine Power Plant by Intake Air Passive Cooling using Phase Change Material based Heat
Published by (ASME Gas Turbine India Conference 2017)
Authors: Devendra Dandotiya, Nitin D Banker. Published December 07, 2017
The power output of a gas turbine plant decreases with the increase in ambient temperature. Moreover, the ambient temperature fluctuates about 15 20°C in a day. Hence, cooling of intake air makes a noticeable improvement to the gas turbine performance. In this regard, various active cooling techniques such as vapor compression refrigeration, vapor absorption refrigeration, vapor adsorption refrigeration and evaporative cooling are applied for the cooling of intake air. This paper presents a new passive cooling technique where the intake air temperature is reduced by incorporating phase change material (PCM) based heat exchanger parallel to conventional air intake line. During the daytime, the air is passed through the PCM which has melting temperature lower than the peak ambient temperature. This will reduce the ambient air temperature before taking to the compressor. Once the PCM melts completely, the required ambient air would be drawn from the ambient through conventional air intake arrangement. During the night, when there is lower ambient temperature, PCM converts from liquid to solid. The selected PCM has a melting temperature less than the peak ambient temperature and higher than the minimum ambient temperature. It is observed from the numerical modeling of the PCM that about 4 hours are required for the melting of PCM and the intake air also can be cooled by 5 °C for this much time. The thermodynamic analysis of the results showed about 5.2% improvement in net power output and thermal efficiency, each for four hours at an ambient temperature of 45°C.
Performance Enhancement of a Single Door Domestic Refrigerator by Incorporating Section Doors inside Refrigerated Space
Published by (Proceedings of the 12th International Conference on Thermal Engineering: Theory and Applications (IC)
Authors: Dandotiya, D. and Banker N.D.. Published February 25, 2019