Heat exchanger Definition and 154 Threads

Homework Statement I would really appreciate if someone could help me out with this exercise in fluid flow/heat transfer ,because I really struggling with it.Below I am attaching photo of problem+table with values. Thank you in advance !Homework Equations Question link:[/B]...

I'm trying to figure a range of flows of coolant that will pull 200,000 Joules per minute from a heat exchanger cooling oil. The oil is passing through a head that adds 200,000 Joules per minute to 0.5 L / min. The 0.5 L is dumped into a sump with ~7 gallons of oil. The oil then passes...

Hi everyone! I have a silver plated copper heat exchanger (with an internal embedded circuit where liquid nitrogen flows) attached to a bigger aluminium block in order to cool it down. First, I want to estimate it's instantaneous cooling power during cool-down to a stable temperature. I have...

I am currently working on my college project about the design and optimization of plate heat exchanger. However, i have no idea where to start the project. Here is my first thought: - I set the hot and cold fluid to be water, 90 degC for the hot inlet and 30 degC for the cold inlet. - 50mm inlet...

Homework Statement Cold air enters a heat exchanger at 400 [K] and exits it at 1200 [K]. At the 0.025 [m2] inlet, the pressure is measured to be 1.0 [MPa] and the velocity is measured to be 3 [m/s]. The area of the exit is also 0.025 [m2] and the pressure here is measured to be 300 [kPa]. What...

Greetings, I'm preparing for an experiment on a modified Tesla Turbine design and will need to condense the exhaust steam rapidly in order to measure the pounds per hour of saturated steam that goes through the system. Incoming steam could be as high as 90 PSI through a 1" pipe. As the turbine...

I want to design a water heating system for a special type of pool. The system is open-loop, where input water at 10 C has to be heated to 15 C, and then enters the pool and is eventually exhausted out of the pool. The flow rate is about 100 litres/second (6000 litres/minute). Simply heating up...

Hi I am woking on a project with dimensioning a plate heat exchanger and are looking at the effectiveness NTU method. The textbooks provide NTU equations for many kinds of heat exchangers but not for plate heat exchangers. Does anyone knows where I can find an NTU equation for a counter flow...

really need help in designing a helical coil HE. i know i must first do an energy balance to find heat rate.but what next?to find the area needed and the number of turns etc

Lets assume an exchanger that is 100% efficient (no heat loss). Duty (Q) and LMTD is known. Your overall heat transfer coefficient (U) is dependent on your transfer coefficients on the shell and tube side, and the resistance of the pipe walls (we're going to ignore entrance effects and fouling)...

Let's say I have a shell and tube heat exchanger that is producing steam. I have a known volume of water entering the shell of the heat exchanger. Would the rate of steam generation be something like... rate of steam generation = (volume of water)*(density of steam)/(time it takes to deplete...

Hi, I have been asked to create a mechanical drawing of a Shell and Tube Heat Exchanger as part of my course, and have been given some drawings as an example of what mine could look like. I have managed to create drawings on CAD using the example as a target point, however with some of the...

Hi all! I'm working on a project of heating water from exhaust gases of kamin's chimney. I have a cross flow heat exchanger (see pdf). we have done calculations of heat transfer rate and the outlet temerature of the water, and got 150C. so it probably gets boiled somewhere inside the HX. I need...

Hi, I hope this is the right section. I'm trying to figure out a rough estimate of the pressure drop in a spiral heat exchanger. The fluids both being water. My guess it it would be in terms of the surface area of the inside of the heat exchanger, and the flow rate, but I can't seem to nail...

I'm new to this forum, and would just like to say this is a very impressive site. My question is what is the best path way in school to design heat exchangers for power plants (more geared towards nuclear power plants.) I'm currently finishing my first year of school studying mechanical...

Homework Statement If you are allowed to make changes of column pressure and temperature, stream preheating or cooling temperature, please propose a process change that can significantly reduce the energy consumption at DTmin of 10°C. The modified process should maintain the product quality and...

I am designing a flat plate heat exchanger for a project and I am not sure where to start with the hand calculations, specifically the LMTD and E-NTU methods, also how to work out the parameters which i will need to complete these methods such as area and number of plates. My deadline is soon...

Hi anyone have the procedure to design the plate fin tube heat exchanger (air cooler) at defined mass flow rates and inlet / outlet temperatures , or anyone have an software package can be used for this purpose , please can share it with me

Hello, I have to design a heat exchanger for my uni course and am a little stuck with where to start. I know a little about LMTD and OHTC etc etc. my main starting problem is finding material properties for ethylene glycol, I have tried Engineering Toolbox but for the maximum temperatures I am...

According to this article, it is beneficial to scale down heat exchangers due to the decreased distance the heat has to travel, and therefore the decreased thermal resistance and increased heat flow. "the best way to remove heat from a CPU is to minimize the distance heat must travel from a...

I have a heat exchanger with water/air as medium and we test it in a facility where we cycle the water temperature between 25 to 95 degrees Celcius with a cycle time of 5 minutes for thermal fatigue. Our customer require the testing to be between 5 to 95 degrees instead with 3 minute long...

Hello, I'm working with a heat exchanger I'm trying to integrate into a cooling application. I've done some tests but want to have some clear understating of how the calculations are done or if I have missed something. Below is what I have so far. So it's a radiation with 2 pwm fans, they push...

Homework Statement The exhaust gases from a natural gas-fired central heating boiler leave the boiler at a temperature of 70 deg C. The oxygen content of the exhaust gases is 9% by volume (dry). The rate of energy input (Gross calorific value) to the boiler from natural gas is 16kW. The gross...

Is there some specification in manufacturer's literature or some standards about limit of fluid mixing/ seepage through tubesheet of any particular heat exchanger. Is this an important parameter of specification or it does not matter in every application. If such parameter exist, what is its...

Hello fellow PF members, My teammates and I are working on a project in our Heat Transfer class. It is extremely broad (open ended) and we are not very sure how we should get this project up and going. 1) Project description: We are given an Air Cooled Rankine Cycle. Cooling water, at 70 °C...

I am a little confused, because I know how refrigerators work with a refrigerant and a compressor and heat exchanges, and I am looking to build one myself, just wondering because I was looking for refrigerator compressors online to buy. Do they have an inlet for refrigerant or is the...

Homework Statement [FONT=Times New Roman] [FONT=Times New Roman]A hydraulic fluid initially at 60◦C is cooled to 35◦C using a co-current heat exchanger. Cooling water is available at 15◦C, which must not exceed 30◦C on leaving the heat exchanger. The flow rate of the hydraulic fluid is 1.5...

Hi I am planning to make a DIY heat exchanger. It will be an air-to-air counterflow heatexchanger with equal air flow. I made a small test heat exchanger so I would be able to estimate the required size of the heat exchanger. I did a small experiment with the small exchanger. The outcome is that...

No separate coolant is used, instead lubricating oil to be used for both lubrication and cooling of engine. How to calculate radiator size, coolant flow rate?

Working on a project where we have been asked to utilize waste heat from a combustion process in order to increase the temperature of oil in a separate process. The hot air from combustion is at 340C and the oil is at 22C with a target temperature of 65C I have not seen any hot air heat...

hi I am looking for a complete double pipe heat exchanger thermal and mechanical design. I've found some online sources like this http://scopewe.com/double-pipe-heat-exchanger-design-part-1/ tutorial. and book like process heat transfer by Kern. but I need newer books or online sources. thanks...

hello. I am asked to give a lecture on double pipe heat exchanger . I have studied books like process heat transfer by D.Kern and some online articles. I was wondering if other complete sources are available about http://scopewe.com/double-pipe-heat-exchanger-design-part-1/. I would appreciate...

hi friends, I am going to program a double pipe heat exchanger designer software and I need to every detail on heat transfer and mechanical design considerations. I've read some on double pipe heat exchanger on net like this http://scopewe.com/double-pipe-heat-exchanger-design-part-1/ guide...

I carried out an experiment in a wind tunnel and it shows that as I increase the air velocity the water temperature drop is bigger but the rise in air temperature going through the radiator becomes lesser. Am I wrong to understand that its due to the fact that the air mass flow rate has...

Homework Statement Here is the question: I am confused about the solution. In the solution they found that the minimum capacity rate ratio R = C_min/C_max was zero. This is because of the term I circled in the red which I do not understand why it goes towards infinity. Here is the solution...

I'm trying to model a Transfer function for the response of the deviation in temperature of water coming out of the concentric tube heat exchanger in response to an input velocity of water function. THE PROBLEM I start the derivation with a couple equations in Seborg's Process Dynamics...

Hello, I need help to calculate the length of pipe in copper (d=22mm) to get the water in "kolam" to be 45 degree celcius and the heat pump temp is 55 degree celcius, heat pump water flow is about 1 meter cubic per hours, any simple formulas ? thank you for help

Hello everyone Exam tomorrow on thermodynmaics and can only find one advantage for the NTU method of design over the LMTD method which is: The NTU method does not rely on using an numerical iterative solution to find the outlet temperatures of the heat exchanger, which would be the case if...

Dear All, I am having trouble getting the effectiveness and outlet temperature for counter flow heat exchanger which is described in the attachment below. I already have the answers but do not know what equations to use to get them. I have equations for the effectives and for the outlet...

You can read just bold, or all for further info. :D The COP for a single stage vapour compression refrigerator increases with an increase in evaporating temperature. I would like to to know how it is achieved in reality with the use of an internal heat exch. on the evaporator. Can anyone...

Hi There Based on a Vapour compression refrigeration system: Does anyone out there know a good estimate or any real values for the total heat transfer area for the hot and cold sides of a domestic refrigeration system? i.e. the sum of the areas of the evaporator and the condenser. For the...

Hi There Does anyone out there know a good estimate or any real values for the total heat transfer area for the hot and cold sides of a domestic refrigeration system? i.e. the sum of the areas of the evaporator and the condenser. For the Evaporator: QL=UL.AL.(TL-T1) AL=heat transfer...

My friend and I are trying to design a simple liquid-cooled heat exchanger and I'm getting some odd results so I wanted to get another set of eyes on my math here. We're running four 1.5m sections of nylon tube in parallel through the heat source, which was a thermal input of 265W. The cooling...

I am currently in the process of designing an end-plate for a heat exchanger. I know I can do what I am about to ask with FEA, but that is not feasible right now. Here are the design parameters: Shell and tube HX, Max operating Temp=1100 F, 59 1" SS 304 Tubes, staggered pattern, 12" Shell OD...

Homework Statement In Attachment Homework Equations The Attempt at a Solution Second Attachment. - I have only attempted part (i) so far, because I am not sure if I am doing it correctly. I was thinking since the value of the latent heat of pentane is given, surely it has to be...

Pressure ? If you have a heat exchanger. On the Shell side you have nitrogen gas at 35 bar, and on the tube side you have water at 5 bar. Is it possible to get water into the nitrogen side? I know the answer is yes, but I do not understand why. Is there someone who have a simple explanaton...

I'm constructing a water based central heating system, and in it is a plate heat exchanger. People often tell me not to be scrimpy regarding its effect when picking one. But then I've heard others say that having a 150 kW heat exchanger - when the effect needed will never rise above 40 kW - is...

I am designing a heat exchanger to be used in a house to circulate air from the outside. I have very basic knowledge on the subject and would appreciate any input. I have looked up various topics on the subject and am using "introduction to thermal and fluid engineering" by Kaminski. However...

I'm not usually into the "green" thing, but an unrelated interest brought me to the topic of spiral heat exchangers and I also received some encouragement. The idea is a small, low cost spiral heat exchanger for use in village sized water treatment, desalination, and for making showers...

Homework Statement Refrigerant 134a enters a heat exchanger operating at steady state as a superheated vapor at 10 bars, 60C, where it is cooled and condensed to saturated liquid at 10 bars. The mass flow rate of the refrigerant is 10 kg/min. A separate stream of air enters the heat exchanger...