What is the differece between k- omega , k- epsilon and Spalart-allmaras turbulent models? In our process, instead of using any heat exchanger, we are planning to cool the process stream using ambient air by 150 deg C. It would be very helpful if someone can suggest guideline for the same. Thank you very much, I can solve the problem now. As the tubes experience the shell side and tube side fluids, the mean temperature can be taken as the mean of the four terminal temperatures: (32 + … i have the values of heat capacity rate ratio, overall heat transfer coefficient, temperature at inlet of hot and cold fluid, NTU. heat of the oil (Cph = spec. Well, would you mind sharing these equations? Thank you but I don't have the values for Cpc and Cph. Edited by srfish, 31 March 2015 - 09:32 AM. For a better experience, please enable JavaScript in your browser before proceeding. T ho = outlet temperature of hot side (K) T hi = inlet temperature of hot fluid (K) It is then possible to approximate the size of the heat exchanger by estimating the overall heat transfer coefficient H. H for plate heat exchanger is often in between 2 to 7 kW.m 2.K-1. To calculate Q, we need both inlet and outlet temperatures: T 1′ T 2′ T 1 T 2 What if the outlet temperatures are unknown? This is the main variable that the software test against. Incropera/deWitt, Cengel, Holman etc. JavaScript is disabled. Low Flow in Pipes- posted in Ankur's blog. Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. Two references for thermal effectiveness are: I would recommend the book by Kays & London" compact heat exchangers", or any text that describes the e-NTU method. of both the water and the oil, since both are unknown. Norwegian University of Science and Technology. Do you know the performance of the heat exchanger or heat transfer area? Hot exhaust gases 1.5 kg/s, enter a finned-tube, cross-flow heat exchanger at 250°C and is used to heat pressurized water at a flow rate of 1 kg/s available at 35°C. Then one temperature is changed in small increments and the resulting heat flux is calculated. I have tried using the continuity equation but the answer is not right. Then I calculate new value of U using m*Cp*(Tc,o-Tc,i)=U*A*F*LMTD (F is correction factor, c= cold, m= mass flow rate). heats. How to compute outlet temperature of 1-2 shell and tube heat exchanger using NTU method ? At the start the two shell side temperatures are set equal to each other. In a typical heat exchanger, is there any specific rule that the hot fluid should flow through the inner tubes?? Promoting, selling, recruiting, coursework and thesis posting is forbidden. If you seek steady-state solutions (e.g. In this white paper, you will learn how real-time 3D technology can enable this optimization at all stages within the energy industry. How can I determine the mass flow rate of steam through a boiler? I already have the answers but do not know what equations to use to get them. Is there any mistake in my calculation or should I use E-NTU ? How to calculate the effectiveness of a two fluid heat exchanger when one of the fluid is undergoing change of phase? Already a member? If i can somehow get Cph and Cpc, I must be able to complete the other equations as these are the missing values. Srfish, i'm curious to know how to calculate having only two temperature. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. Check out the latest downloads available in the File Library. Total surface area, fluid inlet temperature (both tube and shell), flow rate are given. What is the recommended temperature difference for heat exchange below zero Celsius? LMTD can be calculated by using the following formula, where ∆T1 = T1–T4 and ∆T2 = T2–T3 2. I want to extract heat from stationary saline hot water. Considering for example a design hot fluid inlet temperature of 32°C and an outlet one of 12°C, and a cold fluid inlet temperature of 7°C with an outlet one of 11.7°C, how can I obtain outlet temperatures for both fluids changing inlet ones keeping fixed the geometry and the mass-flowrates ?

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