Design and Analysis to Analyse the Heat Transfer of Space Heater for Boat

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As fossil fuels are depleting gradually with the course of time there is a need in developing innovative products that can extract maximum potential that the system can deliver. One of the key area that still make use of diesel fuels for experiencing thermal comfort is the boat heating system. Due to its user friendly characteristics with low maintenance requirements has still be the benchmark for all other types of heaters. Boat cabin heater is an essential setup for all kinds of boats and ship not just for the warmth but also to eliminate the dampness that can spread throughout the boat in cold weather. The paper presents the detailed analysis of thermal behaviour inside a space heater using computational fluid dynamics technique to study the effect of fin numbers and fin location inside the heat exchanger. A total of 11 cases were simulated to study the effect of fin on the heat transfer rate and pressure drop. An optimization is done to have maximum heat transfer rate with minimum pressure drop and results showed that case number 9 has satisfied the above criteria to obtain an effectiveness of 90%.

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In this paper, two cases of heat exchangers (HEXs) which previously were used in exhaust of internal combustion engines (ICEs) are modeled numerically to recover the exhaust waste heat. It is tried to find the best viscous model to obtain the results with more accordance by experimental results. One of the HEXs is used in a Compression Ignition (CI) engine with water as cold fluid and other is used in a Spark Ignition (SI) engine with a mixture of 50% water and 50% ethylene glycol as cold fluid. As a main outcome, SST k-ω and RNG k-ε are suitable viscous models for these kinds of problems. Also, effect sizes and numbers of fins on recovered heat amount are investigated in various engine loads and speeds.
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In this study, a simple and highly accurate semi-analytical method called the Differential Transformation Method (DTM) is used for solving the nonlinear temperature distribution equation in a longitudinal fin with temperature dependent internal heat generation and thermal conductivity. The problem is solved for two main cases. In the first case, heat generation is assumed variable by fin temperature and in the second case, both thermal conductivity and heat generation vary with temperature. Results are presented for the temperature distribution for a range of values of parameters appeared in the mathematical formulation (e.g. N, εG, and G). Results reveal that DTM is very effective and convenient. Also, it is found that this method can achieve more suitable results compared to numerical methods.
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A three dimensional numerical simulation study has been carried out to predict air flow and temperature distribution in the tube type heat exchanger associated with large electrical motor. Due to symmetry in geometrical construction, a section of heat exchanger has been considered for CFD analysis by using PHOENICS software. The k - ε turbulence model has been used to solve the transport equations for turbulent flow energy and the dissipation rate. The outlet temperature of cold & hot air predicted by the CFD simulation has close agreement with experimental results. Further, the performance of parallel PHOENICS on PARAM 10000 is reported in the present work.
heat transfer a practical approach
In the present study the performance of a concentric tube heat exchanger is analyzed with passive heat transfer technique. The performance of the heat transfer process in a given heat exchanger is determined for three different longitudinal fin profiles, rectangular, triangular and parabolic. Numerical analysis was carried out in a parallel flow double pipe heat exchanger for the above profiles for varied mass flow conditions both in the inner and outer tube. Base width and height of the fin were kept constant for all the three types. Simulated results indicated an enhancement in the heat transfer rate for a finned tube compared to the unfinned one. Among the different configurations, fin with rectangular profile showed marginal improvement over triangular and concave parabolic profiles in terms of heat transfer characteristics. For a constant value of mcc = 0.02kg/s and varying mch, rectangular finned tubes showed an average improvement of 6.1% over the triangular and 9.2% over parabolic finned tube. Similarly For a constant value of mch = 0.02kg/s and varying mcc, it showed an improvement by 2 and 5% over the triangular tube and parabolic finned tube respectively Fins with concave parabolic profiles exhibited minimum pressure drop and has reduced by 38% and 65% compared to the triangular and rectangular finned tube.
In this research, a multi objective optimization based on Artificial Neural Network (ANN) and Genetic Algorithm (GA) are applied on the obtained results from numerical outcomes for a finned-tube heat exchanger (HEX) in diesel exhaust heat recovery. Thirty heat exchangers with different fin length, thickness and fin numbers are modeled and those results in three engine loads are optimized with weight functions for pressure drop, recovered heat and HEX weight. Finally, two cases of HEXs (an optimized and a non-optimized) are produced experimentally and mounted on the exhaust of an OM314 diesel engine to compare their results in heat and exergy recovery. All experiments are done for five engine loads (0%, 20%, 40%, 60% and 80% of full load) and four water mass flow rates (50, 40, 30 and 20 g/s). Results show that maximum exergy recovers occurs in high engine loads and optimized HEX with 10 fins have averagely 8% second law efficiency in exergy recovery.
In this paper, after a short review of waste heat recovery technologies from diesel engines, the heat exchangers (HEXs) used in exhaust of engines is introduced as the most common way. So, a short review of the technologies that increase the heat transfer in HEXs is introduced and the availability of using them in the exhaust of engines is evaluated and finally a complete review of different HEXs which previously were designed for increasing the exhaust waste heat recovery is presented. Also, future view points for next HEXs designs are proposed to increase heat recovery from the exhaust of diesel engines.
In this study, heat transfer and temperature distribution equations for longitudinal convective–radiative porous fins are presented. It is assumed that the thickness of fins varies with length, so four different shapes (rectangular, convex, triangular and exponential) are considered. Temperature-dependent heat generation, convection and radiation are considered and heat transfer through porous media is simulated using passage velocity from Darcy's model. After deriving equation for all geometries, the Least Square Method (LSM) and fourth order Runge–Kutta method (NUM) are applied for predicting the temperature distribution in the porous fins. The selected ceramic porous materials are Al, SiC, and Si3N4. Effects of porosity, Darcy number, Rayleigh number, etc. on transferred heat are examined. As a main outcome, exponential section fin with Si3N4 material has the most amount of transferred heat among other shapes and materials.
Temperature distribution equation and refrigeration efficiency for fully wet circular porous fins with variable sections are introduced in this study by a new modified wet fin parameter presented by Sharqawy and Zubair. This parameter can be calculated without knowing the fin tip condition by considering the temperature and humidity ratio differences for the driving forces of heat and mass transfer, respectively. It’s assumed that heat and mass convective coefficients vary with fin temperature and heat transfer through porous media is simulated using passage velocity from the Darcy's model. After presenting the governing equation, Least Square Method (LSM) and fourth order Runge-Kutta method (NUM) are applied for predicting the temperature distribution in the sample aluminum porous fins. After that, effects of porosity, Darcy number, Rayleigh number, Lewis number and etc. on fin efficiency are examined. As a main outcome, for reaching to high values of fin efficiency, rectangular fin should be used instead of convex and triangular sections.
This literature review focuses on the applications of Computational Fluid Dynamics (CFD) in the field of heat exchangers. It has been found that CFD has been employed for the following areas of study in various types of heat exchangers: fluid flow maldistribution, fouling, pressure drop and thermal analysis in the design and optimization phase. Different turbulence models available in general purpose commercial CFD tools i.e. standard, realizable and RNG k − ε RSM, and SST k − ε in conjunction with velocity-pressure coupling schemes such as SIMPLE, SIMPLEC, PISO and etc. have been adopted to carry out the simulations. The quality of the solutions obtained from these simulations are largely within the acceptable range proving that CFD is an effective tool for predicting the behavior and performance of a wide variety of heat exchangers.
In this study, three highly accurate and simple analytical methods, Differential Transformation Method (DTM), Collocation Method (CM) and Least Square Method (LS) are applied for predicting the temperature distribution in a porous fin with temperature dependent internal heat generation. The selected porous fin’s materials are Si3N4 and AL and generated heat varies linearly with temperature. The heat transfer through porous media is simulated using passage velocity from the Darcy’s model. Results reveal that DTM, CM and LS are very effective and accurate in comparison with the numerical results. Moreover the temperature distribution is depended to the Darcy and Rayleigh numbers. In addition the results show that using the AL as a porous fin’s substrate leads to higher value of temperature than Si3N4 element. A higher heat generation rate leads to higher fin temperatures since more amount of heat is dissipated to the surrounding.
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