Questions tagged [heat-exchanger]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
1 answer
30 views

Water Dispenser Cooling System

I am interested in creating a water dispenser myself for cooling water, and am looking for a cheap and not too engineering complex concept. I found a water dispenser on Aliexpress, for a very cheap ...
Johmi's user avatar
  • 1
0 votes
2 answers
48 views

Does fog affect the efficiency of heat pumps?

Aggregate changes require way more energy than temperature changes. I vaguely remember that it takes about the same engergy to get water from 5°C to 80°C as getting ice to 1°C warm water. Hence my ...
Martin Thoma's user avatar
0 votes
0 answers
9 views

Suggestions for estimating Heat Load (watts) in an evaporator (antifreeze - hot fluid, R744 - cold fluid)

I am working on simulating an evaporator for an R744 refrigeration cycle. Here, I have inlet conditions of R744 with low pressure (around 30 bar) and low temperature(-8°C) and that of antifreeze (35% ...
ascruine's user avatar
0 votes
1 answer
84 views

How do I calculate effectiveness and NTU of a heat exchanger when there is phase change?

This is my first post here. I explain the big picture of my current circumstances, I am a software engineer currently making a platform for evaluating process equipment in plants. I do not really know ...
Diego F's user avatar
0 votes
1 answer
895 views

What is the correct way to calculate the efficiency of a heat exchanger?

I want to evaluate the efficiency of a heat exchanger. From measurements I know all four temperatures $T_1$, $T_2$, $t_1$ and $t_2$ as well as the mass flows of both fluids $m_1$ and $m_2$ and if ...
Axel's user avatar
  • 95
0 votes
0 answers
16 views

Configurating heat transfer between parts

I am new to Ansys, so sorry if I have some misunderstood parts. I am doing a Steady-state Thermal simulation of a PCB with some of its components. I am currently simulating only the highlighted ...
PepitoGrillo's user avatar
0 votes
0 answers
99 views

Water through a Copper-Coil Heat-Exchanger: How much tubing will be enough?

I am making a hot-water tank for a boat. Within it will be a copper-coil heat-exchanger. Because copper tubing can be rather expensive, I am trying to better understand the design beforehand, and ...
GhostsonAcid's user avatar
1 vote
1 answer
36 views

Can I use a UPS in front of my A/C heat pump, to reduce surges in the house?

Hopefully this is on-topic here. I'm open if I should as on another SE site. We have an air conditioner heat pump outside, typical to most homes with one. When it kicks on, many of the lights dim for ...
New Alexandria's user avatar
0 votes
0 answers
14 views

Finding Intermediate Temperatures of 2-Stage Counter Current Heat Exchanger

I have a 2-stage counter current heat exchanger where I am given the initial temperatures for the cold and hot fluids (TH1 and TC1) as well as the final temperatures (TH3 and TC3). Additionally, The ...
Jaden's user avatar
  • 1
0 votes
2 answers
51 views

Advice needed on how to cool 50 ml liquid from 60 °C to 30 °C

In Short: I'm working on a project where we need to cool 50 ml of liquid from 60 °C to 30 °C or 20 °C. The liquid will be in a 150 ml copper container with an open top. Due to the lack of skills in ...
MrBear's user avatar
  • 3
0 votes
2 answers
120 views

how to find final temperature of a fluid in an heat exchanger?

I have to find final temperature of water in an heat exchanger. the heat exchanger must cool down air using water, meaning initial temperature of water must be cold, initial temperature of air is 298....
Gabriel Burzacchini's user avatar
0 votes
1 answer
183 views

How can you determine the heat transfer area of a plate heat exchanger

Given the number of plates and channels (1-number of plates), as well as the width and length of each plate, it is true that the heat transfer area can be calculate by: A = wL number_of_channels Is ...
Jonas's user avatar
  • 1
0 votes
0 answers
75 views

Ultra-high temperature heat pump possibilities

How can I best transfer heat from space A [200ºC, 200 bar] to space B [1060ºC, 200 bar] using a heat pump style method? Both spaces are air filled. Keeping in mind typical material limitations, a ...
Tom's user avatar
  • 1
1 vote
1 answer
62 views

Cooling of two hot fluids

I have two hot fluids that need to be cooled. The first is the water loop that is used to cool the motor and power electronics. The second is an oil loop used to cool a gear box. Both these will be ...
sam's user avatar
  • 11
0 votes
0 answers
62 views

What would be the advantage of using Colburn j factor instead of h (heat transfer coefficient)

Why do researchers use the Colburn j factor vs. Re when presenting the thermal performances of a heat exchanger? A graph of the heat transfer coefficient h vs. Re wouldn't be sufficient? What are the ...
Hélène's user avatar
  • 101
0 votes
1 answer
582 views

Does wiring heat elements in parallel vs series at the same power affects the results?

I am designing an electric kiln just for fun and I found myself not knowing how to answer this scenarios. The main constant is power. The final power must be the same in each case. My question is ...
Jack of all trades's user avatar
0 votes
1 answer
44 views

If 200kg/s mass flow rate of LNG is feasible in a heat exchanger?

Here is the situation: In a shell and tube condenser, the hot shell side is Pentane from 115°C to 36°C and the cold tube side is LNG at the temperature of -161℃ at the inlet of the heat exchanger. The ...
Shaw morn's user avatar
0 votes
0 answers
19 views

Is it possible to do hot gas filtration through fluidized bed reactors

I am working on flue gas filtration and HCl gas is to be removed from the gas. I am wondering if a fluidized bed reactor could be used to filter the gas. The problem is, a furnace is used to provide ...
Divyanshi Rawat's user avatar
2 votes
2 answers
62 views

Does it make sense to increase the thermal "dead weight" of a wood stove?

It is general practice to put a bucket of water on top of a wood stove to keep air humidity under control during the burning of the stove. But, such a bucket is also bound to keep some more thermal ...
5th decile's user avatar
1 vote
0 answers
102 views

Heat Transfer in a tubular reactor with constant jacket temperature - impossible solution?

I have received from my professor the following problem: A first-order exothermic reaction A -> B takes place in a tubular reactor (typical PFR). The tube is cooled to a constant wall temperature $...
J Faller's user avatar
0 votes
1 answer
914 views

Method for computing the pressure drop across a bank of tubes

I would like to determine the pressure drop of fluid in cross flow over a bank of tubes. (see figure 1). Previously, I've used the correlation listed in "Fundamentals of Heat and Mass Transfer&...
Emily Conn's user avatar
0 votes
1 answer
78 views

Predicting the behaviour of a boiler system if we modify temperatures

I am currently studying a boiler without many technical data. Below a short description: Fuel is put inside the boiler furnace. Primary (F1) and secondary air (F2) fans allow fresh air to go through ...
Snite's user avatar
  • 23
4 votes
2 answers
138 views

Cooling system to maintain 0.5 °C at 95% humidity

I am looking for some guidance on a redneck cooling system. I need to store seeding trees at a temperature just above freezing, and at a humidity of close to saturation. I only need the system for ...
Sherwood Botsford's user avatar
0 votes
1 answer
80 views

How to design a fridge / freezer / air conditioner / heat pump?

I have this question / problem in my mind for an estimated of ~20 years. Obviously, my life does not depend on the solution, but the quality of the life of my brain might get improved :) Shortly: How ...
virolino's user avatar
  • 101
0 votes
0 answers
221 views

Nozzle inlet and outlet diameter for a shell and tube heat exchanger

Hi I have designed a shell and tube heat exchanger to cool octane and water. I have all the dimensions but I was unsure which equation to use to calculate the diameter for the inlet and outlet nozzles....
Kiran Brown's user avatar
0 votes
2 answers
68 views

Maximum rate of heat transfer in a balanced counter flow heat exchanger in NTU method

In effectiveness NTU method for heat exchangers, we have effectiveness of the heat exchanger defined as $$\epsilon = \frac{Q_{actual}}{Q_{max}}$$ Where $$Q_{max} $$ is the maximum rate of heat ...
Harshit Rajput's user avatar
1 vote
1 answer
61 views

In this scenario, if I continue to increase the length of heat exchanger how will the temperatures change?

Consider a counter flow double pipe heat exchanger inside which the cold fluid enters at 20 degrees Celsius and hot fluid enters at 100 degrees Celsius. Initially the length of the heat exchanger is ...
Harshit Rajput's user avatar
0 votes
1 answer
328 views

Maximum rate of heat transfer in Effectiveness NTU method for a heat exchanger

The effectiveness NTU method is used for determining the heat transfer rate for a heat exchanger, with known inlet temperatures and surface area. It makes use of effectiveness which is defined as $$\...
Harshit Rajput's user avatar
-1 votes
1 answer
179 views

Arithmetic and Log mean temperatuer difference of a double pipe heat exchanger with parallel flow

Consider a double pipe parallel flow heat exchanger, the mean temperature difference in this case turns out to be logarithmic because the temperature profiles are exponential. If we would have made ...
Harshit Rajput's user avatar
0 votes
0 answers
74 views

How to model a condenser (heat exchanger) where both streams are two fluid mixtures?

As mentioned I would like to model a heat exchanger (using Python). In this case, the condenser/hx streams are both a mixture of O2 and N2 These are known for both streams: Inlet temperature Inlet ...
casualguitar's user avatar
1 vote
3 answers
238 views

Why does thermal conductivity of a pipe matter in a double pipe heat exchanger?

My understanding is that thermal conductivity is responsible for the time until something will heat up. For example, if you hold a copper bar over a candle it will quickly become hot at the other end. ...
user1477107's user avatar
0 votes
3 answers
360 views

How are heat exchangers normally calculated?

Most of the calculations that I find in books are about calculating the heat transfer rate, which I'm not sure why I would care about. What I imagine is the case in a real world situation is that I ...
user1477107's user avatar
0 votes
1 answer
771 views

In a shell and tube heat exchanger, does reducing flowrate affect the outlet temperatures?

Let's say I have 2 exchangers that are completely the same, only difference being that one of them has half the number of tubes. Also let's assume the coolant is the same and has the same inlet ...
user1477107's user avatar
0 votes
1 answer
67 views

How to transfer air heat easily?

Assume two buildings, one which generates a lot of air heat inside due to electrical equipment running etc. The buildings are 20-25 meters apart. Some questions: How can one easily transfer heater ...
Roel Van de Paar's user avatar
0 votes
1 answer
33 views

What is the fouling effect (in rate, foulant thickness) of sand inside tube side of a shell and tube heat exchanger?

I am working with RO reject which has high turbidity (mainly insoluble salts and also sand now). This is also my process stream and needs to go through a heat exchanger at 50-60C and flowing at 0.25m/...
Varun Santhikumar's user avatar
2 votes
1 answer
50 views

Does a photon impart energy on a surface (to raise its temp) if it goes THROUGH that surface?

Hi so I have this senior design project involving cooling human skin as it is irradiated by an infrared LED. Human skin not only is super absorbent to IR, but that IR goes THROUGH the thickness of it ...
MeowMix's user avatar
  • 23
3 votes
2 answers
357 views

Furnace Combustion Air Properties

My house is heated by a condensing natural gas furnace that is rated as 92% efficient. It has the option to draw combustion air directly from outside. I know the main advantage of this is avoiding ...
obligong36's user avatar
0 votes
1 answer
344 views

What temperature could be achieved when nitrogen is used as a refrigerant in the heatpump?

Well we all are familiar that nitrogen is used to achieve low temperature. I was just wondering how can one determine the temprature that could be achieved when phase change of nitrogen is done from ...
Tank's user avatar
  • 87
2 votes
2 answers
4k views

Heat transfer Calculation, for Cooling for an aluminium box

To go into more detail, I basically have a controller and its housing is basically an aluminium box that I need to add heat sinks to. But first I need to calculate how much heat is being dissipated by ...
joseph's user avatar
  • 41
1 vote
2 answers
313 views

Heat Exchanger Design (Log Mean Temp Difference or Epsilon NTU Method)

I am trying to design two heat exchanger interfaces (shell and tube) that transfers heat to and from an intermediate heat pipe. The picture below gives a general idea of the problem I am trying to ...
Mark Pineau's user avatar
1 vote
2 answers
78 views

When is a heat exchanger worth it?

I am currently working on a huge industrial process for a student project and we need to transfer around 25MW of energy between dozens and dozens of streams, some larger and some smaller ones. Many ...
passwortknacker's user avatar
1 vote
0 answers
49 views

How does energy recovery recuperator work

In a recuperator http://en.wikipedia.org/wiki/Recuperator, sensible heat can be transfered by thermal conduction through the plates, and latent heat can also be transfered when the high temperature ...
jw_'s user avatar
  • 163
5 votes
4 answers
5k views

Why Nusselt number for laminar flow in a pipe is independent of Reynolds number

I understand that for fully developed flow inside a tube (with constant properties), Nusselt number doesn’t change in axial direction but it is surprising that it is also independent of Reynolds ...
moeinSj's user avatar
  • 101
4 votes
1 answer
283 views

In a diesel engine, does more heat leave the engine through the tailpipe or the radiator?

Diesel exhaust is hot, and there's a lot of it. Diesel radiators also get pretty hot. In a typical diesel engine, which one is dissipating more heat? EDIT: In response to a request for specificity ...
Diogenes Creosote's user avatar
2 votes
1 answer
37 views

Why do plate exchangers typically serve lower pressure fluids than shell and tube heat exchanger?

According to Wikipedia http://en.wikipedia.org/wiki/Heat_exchanger, plate exchangers typically serves lower pressure fluids than shell and tube heat exchanger, why? Tubes in plate exchangers are ...
jw_'s user avatar
  • 163
3 votes
1 answer
54 views

How to periodically shut down a recirculating hot water solar thermal system

I am posed with a scenario where a hot water solar thermal system has been setup. The system comprises of a cold water tank, heating arrays and then a hot water tank. The system is closed loop and ...
Nouman Qaiser's user avatar
1 vote
2 answers
76 views

why not put the compressor right next to the evaporator?

the cold line from evaporator to compressor will gain tons of heat on a super hot day even with insulation. if they put the compressor right outside the evaporator, both of the long lines will be hot ...
user24144's user avatar
1 vote
0 answers
45 views

How can we dissipate the heat from a block of 10*10*3 mm with 100 degree Celsius without losing the portability of the block?

I have a Peltier's device of 10*10*3mm and the material is Bismuth Telluride. The hot side is 100 $^oC$ and I want to dissipate the heat, and at the same time, the device should be portable i.e. it ...
Adarsh Shubhananda's user avatar
1 vote
1 answer
106 views

Heat Exchangers

LMTD of a counter flow heat exchanger is 20°C and cold fluid enters at 20°c & hot fluid at 100°C, mass flow rate of cold fluid is twice that of mass flow rate of hot fluid. $C_p$ of hot fluid is ...
Hari kumar's user avatar
0 votes
1 answer
224 views

Average Nusselt number or heat transfer coefficient to compare better heat transfer?

I'm simulating different arrays for cylinders in a simple cross flow heat exchanger (cylindrical pipes) as shown below: Inlet temperate(300K) is constant and the cylinders are at constant temperature(...
Moreza7's user avatar