Heat Exchanger, Heat Transfer, Effectiveness, NTU, Energy Recovery
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exchanger flow •Correlations covered in Lectures 3 and 5 can be used for calculating heat transfer coefficient and pressure drop or
Heat transfer processes set limits to the performance of aerospace components and systems and the subject is one of an enormous range of application. The notes are intended to describe the three types of heat transfer and provide basic tools to enable the readers to estimate the magnitude of heat transfer rates in realistic aerospace applications.
In this paper a mathematical model for cross-flow heat exchangers with complex flow arrangements for determining e -NTU relations is presented. The model is based on the tube element approach,...
We computationally model the flow over groups of offshore energy storage balloons. • Long, precessing vortex tubes are shed downstream from the balloons. • Total drag coefficient of the closed case is less than that of the wide case. • Total drag of floral configuration is smaller than 3 times drag of single balloon. • The LES was more capable of simulating the
The main thermophysical characteristic of heat exchangers is the global coefficient, UA. This characteristic allows us to quantify the amount of heat transferred from medium 1 to medium 2 at a
In this paper a mathematical model for cross-flow heat exchangers with complex flow arrangements for determining e -NTU relations is presented. The model is based on the
Abstract: This paper presents heat transfer and effectiveness analysis based on a physical model of a cross-flow heat exchanger. Using the model, the transferred heat and effectiveness (ε) in terms of temperature and NTU-method are calculated for both hot and cold streams.
Currently, the evaluation of valve flow coefficient is often performed by theoretical estimation or experimental measurement. Theoretical estimation cannot reflect the influence of detailed valve structure, and thus often results in poor accuracy. 1,2 Experimental measurement requires significant costs in time and equipment. 2,3 Especially for some valves
The present study will be beneficial in terms of selection of the suitable passive enhancement method for the cross-flow heat exchanger for improving the overall thermal performance of the system, based on flow Reynolds number, pressure drop characteristics and type of applications.
The present study will be beneficial in terms of selection of the suitable passive enhancement method for the cross-flow heat exchanger for improving the overall thermal
A two-dimensional cylindrical shaped EPCM capsule or tube is considered in simulations using gas (air) and liquid (Therminol/VP-1) as heat transfer fluids in a cross flow
uniformity model in an air-cooled cross-flow heat exchanger and investigated its effect on the complex heat transfer coefficient, which was proportional to 0.6 power of quantity
In this paper, design optimization of the compact heat exchanger in a proposed heat recovery ventilator of the energy efficient building has been carried out and discussed. Appropriate theoretical models are required to evaluate system
Heat transfer processes set limits to the performance of aerospace components and systems and the subject is one of an enormous range of application. The notes are intended to describe the
Energy Research Journal Original Research Paper Heat Transfer and Effectiveness Analysis of a Cross-Flow Heat Exchanger for Potential Energy Recovery Applications in Hot-Humid Climate 1Masitah, A.R.S., 1Mardiana I Ahmad and 2Y.M. Yatim 1Energy, Indoor & Environmental Quality Research Group, School of Industrial Technology,
where C B 1 L m val is the Spearman correlation coefficient between the active power of the energy storage and the branch L m, M is the number of branches in the power grid. R X l and R Y l represent the ranks of the energy storage output power and branch power after sorting, R ¯ X and R ¯ Y represent the average ranks.. 2.2 Power correlation coefficient
uniformity model in an air-cooled cross-flow heat exchanger and investigated its effect on the complex heat transfer coefficient, which was proportional to 0.6 power of quantity of flow in his conclusion. Kærn et al.13,14 studied the non-uniformity of cold and hot fluid in evaporator with numerical method. And he
Based on the fast response time and high response accuracy of energy storage, the frequency regulation loss resistance coefficient of energy storage and thermal power is constructed to improve the enthusiasm of energy storage. Secondly, a two-layer model is proposed to allocate power between thermal power and energy storage, taking into account
Based on the fast response time and high response accuracy of energy storage, the frequency regulation loss resistance coefficient of energy storage and thermal
In order to prevent the volume flow of the final stage from being too small, causing a large decrease in efficiency, the first stage is usually designed with a large flow coefficient. For example, centrifugal compressors in the field of compressed gas energy storage have a first-stage flow coefficient of more than 0.15 (Garvey and
In addition, free flow discharge coefficients exceed those for submerged flow. Relative energy losses (ΔE) range from 0.271 to 0.604. Energy losses of these magnitudes cannot be ignored, and
Accurate calculation of discharge is a critical task in terms of environmental and operational regulations. In the current study, a new approach for determining vertical sluice gates'' flow discharge with a minor bias is proposed. Energy-momentum equations are used to characterize the physical expression of the phenomena intended for generation of the
In order to prevent the volume flow of the final stage from being too small, causing a large decrease in efficiency, the first stage is usually designed with a large flow
In the literature, values of both coefficients for typical cross sections can be found. More specific, the value of the energy coefficient α ranges from 1.10 to 1.5 and the momentum coefficient β from 1.05 to 1.17 for natural cross sections (Chow 1959).For over-flooded rivers, average values of α (= 1.75) and β (= 1.25) are recommended (Kolupaila 1956).
A two-dimensional cylindrical shaped EPCM capsule or tube is considered in simulations using gas (air) and liquid (Therminol/VP-1) as heat transfer fluids in a cross flow and an axial flow arrangement. The energy storage/retrieval times into/out of the EPCM capsule is dictated by the surface heat transfer of the EPCM for the capsule
Download scientific diagram | Flow coefficient, work coefficient, reaction coefficient and isentropic efficiency for each stage comparing baseline and VCC blading for the design point at nominal
The experimental results for cross-flow water-air type heat exchanger carried out for different cold and hot flow rates are presented in Fig. 1 [20]. To conclude, Section 2 is devoted to a theoretical background on the overall heat transfer coefficient of a HX. Furthermore, Section 3 details the concept of the innovative method. In addition, Section 4 presents the
The development of the cross-flow heat exchangers for increased heat transfer rate is achieved by finning the tubes of different tube geometry and pitch ratios. The latest development is the use of the vortex generators or winglets so as to increase the fluid turbulence.
In this paper a mathematical model for cross-flow heat exchangers with complex flow arrangements for determining e -NTU relations is presented. The model is based on the tube element approach, according to which the heat exchanger outlet temperatures are obtained by discretizing the coil along the tube fluid path.
This heat transfer area is an area of the exchanger that is in direct contact with fluids and through which heat or energy is transferred. Figure 1 shows the cross-flow heat exchanger. The exchanger contains alternate corrugated plates arranged in a cross-flow manner.
The pumping losses are the inherent part of the cross-flow heat exchanger, which can be minimized to a certain extent but cannot be eliminated completely. Further with large array size, and staggered layout of the tube bank pumping power increases even further.
In this study, the theoretical and experimental study of a cross-flow heat exchanger is carried out based on the theory of porous media under low Reynolds number. The accuracy of the mathematical calculation model is verified by experi- ments.
The pressure drop is bound to be high for different fin and vortex generators, but in such case increase in the heat transfer rate is a critical aspect of comparison. Such a study on cost estimation will form the basis in the selection of cross-flow heat exchanger with suitable tube geometry, fin, and vortex generator.
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