http://localhost:8080/xmlui/handle/123456789/6775 2026-04-12T01:52:17Z 2026-04-12T01:52:17Z Chauhan, Brijesh http://localhost:8080/xmlui/handle/123456789/6978 2020-11-04T06:08:46Z 2018-05-01T00:00:00Z

Improvement in condenser effectiveness of air conditioning system Chauhan, Brijesh In a global era, Air conditioning system become necessary due to hot and dry climate so that continuous growth in energy demand with its associated cost and appropriate climate problems is causing stress in exploring more efficient ways to provide cooling in enclosed space without degradation of the environment. In the hot and humid area, major part of conventionally created electrical energy is consumed by air conditioning system. So, to overcome this type of problem improvement in condenser effectiveness is necessary. In this project effectiveness of condenser unit is improved with the use of solar operated pump and mist water spray on condenser unit. As a result of this proposed work is, COP of the simple VCR system is increased as well as compressor work is decreased and energy consumption is reduced. For Full Thesis Kindly contact to respective Library

2018-05-01T00:00:00Z Gajipara, Kaushal http://localhost:8080/xmlui/handle/123456789/6976 2020-11-04T06:06:59Z 2018-05-01T00:00:00Z

Design & analysis of shell & tube heat exchanger for different types of baffles using cfd Gajipara, Kaushal In present day shell and tube heat exchanger is the most common type heat exchanger widely used in oil refinery and other large chemical process, because it suits high pressure application. So it is very important to study the behavior of such heat exchangers under different conditions. In present study single pass segmental baffle shell and tube heat exchanger is designed with conventional correlation available along with the reference literature available. After that computational fluid dynamics(CFD) package, Fluent is utilized for modelling single pass shell and tube heat exchanger with segmental baffles. Then change in baffle geometry made and different baffles like perforated baffle, hexafoil hole baffle are tested in CFD Fluent for performance analysis. Also experimental setup is prepared for segmental baffle case, using PVC as shell material and copper as tube material. CFD results for same are compared with the experimental one for segmental baffles. Further investigation is carried out in Fluent. The purpose of this investigation is to improve thermo-hydraulic performance of the heat exchanger with the use of different types of orifice baffles. It is investigated that as the mass flow rate increases, the heat transfer coefficient increases and pressure drop also increases. For same flow rate perforated baffle is having almost same heat transfer coefficient as hexafoil hole baffle but the pressure drop for perforated one is quite higher than the other one. A large computational effort is involved for the memory access of the computers and computing time for the simulation of the complex geometries associated with the dense grids. The available computational fluid dynamics software package FLUENT is applied to determine the related problems. Standard k - ε turbulence model is allowed to predict the three-dimensional flow and the heat transfer characteristics. For Full Thesis Kindly contact to respective Library

2018-05-01T00:00:00Z Gemeda, Abubeker http://localhost:8080/xmlui/handle/123456789/6975 2020-11-05T04:45:01Z 2018-05-01T00:00:00Z

Parametric & cfd analysis of shell and tube heat exchanger by varying baffle geometry Gemeda, Abubeker The heat exchanger is a device that used to transfer thermal energy between two or more fluids, in thermal contact and at different temperature. The Shell and Tube Heat Exchanger are most commonly used in current industrial production. In this study, the effect of baffle spacing on pressure drop and heat transfer coefficient are considered in a shell and tube heat exchanger with single segmental baffles and staggered tube layout. The effects of number of baffles are considered 4, 6, 8, 10, 12, and 14 and baffle spacing are considered 366.67, 220,157.14, 122.22, 100, and 84.61 respectively with 38% baffle cut are investigated to study the effect of pressure drop and heat transfer coefficient. Shell and tube heat exchanger with single segmental baffles is designed with same input parameters using Kern‟s theoretical method and Bell-Delaware method. From the CFD simulation results, heat transfer coefficient and pressure drop values for varying tube layout are provided.Variation of number of baffles with shell side pressure drop heat transfer coefficient are shown. It is discussed that for both methods (analytical calculation and CFD result) pressure drops will be increases with increases number of baffles. K- Standard turbulence model with second order discretization and fine mesh is selected for CFD simulation considered. The result are shown highly sensitive to tube layout orientation selection, it is observed for this heat exchanger geometry 30 tube layout arrangement gives slightly better results. The results are also sensitive to baffle spacing selection, the baffle spacing must be chosen very carefully. For this heat exchanger geometry 14 baffle gives better result. Hence it can be concluded that shell and tube heat exchanger with 30 tube layout orientation results better performance compares to 45 and 90 tube layout orientation and 14 baffle results give better performance compared to 4, 6, 8, 10, and 12 of baffles. For Full Thesis Kindly contact to respective Library

2018-05-01T00:00:00Z Kasmani, Mohammed Noman http://localhost:8080/xmlui/handle/123456789/6973 2020-11-04T06:02:37Z 2018-05-01T00:00:00Z

Investigation of air conditioner using hybrid liquid desiccant system Kasmani, Mohammed Noman In a global era, continuous increment in energy requisition with its associated cost and relevant climate problems is causing accentuation in exploring more efficient ways to provide air conditioning in enclosed space without degradation of the environment. In the hot and humid area, major part of conventionally produced electrical energy is consumed by air conditioning. LDCH (Liquid desiccant-vapor compression hybrid) air-conditioning systems are popular for reducing energy consumption. In conventional air-conditioning systems with vapor compression cycles the dehumidification is realized by cooling the air below the dew point of the supply air. One possibility to avoid cooling the air below the dew point and thus to reduce the electric energy demand of air-conditioning systems is hybrid liquid desiccant air-conditioning systems(HLDACS)which use an open absorption cycle for dehumidification of the air. Our main focus of study is to integrated condenser and regenerator as a single part and dehumidifier and evaporator as a single entity and analyze the performance like energy saving, effectiveness and efficiency of system. Experiment has been performed at different velocity of air like 13.5,17 & 19m/s with Simple VCR system, Hybrid system VCR+LD (Calcium chloride) and also Combination of VCR+Water. Different parameter like Sensible cooling, latent cooling, Total Cooling rate, COP, EER, change in humidity has been calculated. For Full Thesis Kindly contact to respective Library

2018-05-01T00:00:00Z