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How does increasing hot mass flow rate increase overall heat transfer coefficient in shell and tube heat exchanger? 


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Increasing the hot mass flow rate in a shell and tube heat exchanger directly impacts the overall heat transfer coefficient. Studies have shown that the hot and cold fluid flow velocities are directly proportional to the overall heat transfer coefficient (UA). Additionally, research has demonstrated that varying flow rates and speeds of rotation within the heat exchanger can lead to a significant increase in the heat transfer coefficient. Computational fluid dynamics (CFD) simulations have further supported this by indicating that the rate of heat transfer is influenced by the velocity of fluids and the design of the tubes. Therefore, by increasing the hot mass flow rate, the heat transfer coefficient in a shell and tube heat exchanger can be enhanced, ultimately improving the efficiency of the heat transfer process.

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Increasing hot mass flow rate in a shell and tube heat exchanger enhances the overall heat transfer coefficient due to improved fluid velocity, promoting more efficient heat transfer between fluids.
Increasing hot mass flow rate in a shell and tube heat exchanger enhances the overall heat transfer coefficient, leading to a rise in heat transfer efficiency at varying rotation speeds of the tubes.
Increasing hot mass flow rate in a shell and tube heat exchanger directly increases the overall heat transfer coefficient (UA), enhancing heat transfer efficiency between hot and cold fluids.
Increasing hot mass flow rate in a shell and tube heat exchanger enhances overall heat transfer coefficient by intensifying flow turbulence, leading to improved heat transfer efficiency between the working fluids.
Increasing hot mass flow rate in a shell and tube heat exchanger can enhance the overall heat transfer coefficient, leading to improved heat transfer efficiency as discussed in the paper.

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Why the hot water flow rate increase, the efficiency decrease in a heat exchanger using plate heat exchanger?4 answersWhen the hot water flow rate increases in a plate heat exchanger, the efficiency of the heat exchanger decreases. This is because the increased flow rate leads to a decrease in the residence time of the hot water in the heat exchanger, reducing the amount of time available for heat transfer to occur. As a result, the heat transfer rate and effectiveness of the heat exchanger decrease, leading to a decrease in efficiency. Additionally, the increased flow rate can cause deformation of the plates in the heat exchanger, affecting heat transfer and pressure drop characteristics. Therefore, it is important to carefully consider the flow rate in order to optimize the efficiency of a plate heat exchanger.
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What effect of tube from in rectangular heat exchanger in thermal energy storage ?5 answersThe effect of tube shape in a rectangular heat exchanger on thermal energy storage is investigated in several papers. Ghalambaz et al. found that changing the location of heat exchanger tubes can significantly affect the melting rate, with tubes placed too closely together overheating each other and reducing overall heat transfer. Faghri discusses a modified tube and shell heat exchanger with micro heat pipes that enable rapid and efficient transfer and storage of thermal energy. Kuźma proposes a heat exchanger tube with a coaxially positioned inner element, such as a resilient insert with fins, to increase heat exchange surface area and agitate the flowing agent. Anggara et al. investigate the effect of heat transfer fluid (HTF) temperature on PCM melting time in a shell-tube geometry experiment, finding that higher HTF temperature leads to decreased melting time. Muto and Matsuo discuss a heat exchanger tube with improved endurance to chipping, achieved by changing tube specifications, such as the dimensions of fluid circulating holes.

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