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Questions tagged [heat-exchanger]

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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 ...
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18 views

How to calculate the two parameters in the red box about Required ventilation rate and Calculated CO2-loss?

I dont know how to calculate the two parameters.I think The total energy of the light is 700w/m2*3600s=2520Kj,then I will not do it.
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1answer
42 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(...
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1answer
27 views

Heating hot air within a 2 inch tube

Background So I am working on a project to where I am trying to heat up air within a 2 inch tube, with high air flow. I am using 2 inch tri clamp stainless steel tubes where I basically have a fan ...
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0answers
22 views

Are there any books which show how to design electrical coil heat exchangers?

I need to design an electrically powered gas heater, but i need to do so in detail. I'm looking for a guide similar to the shell and tube heat exchanger design guide in coulson and richardson's ...
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0answers
49 views

Search for comprehensive term for plants with heat generation with heat storage and operating states

My master thesis deals with systems with several operating states that generate heat and store it in a heat storage. Thereby I analyze combined heat and power plants with combustion engines, but also ...
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1answer
44 views

How to control precisely the wall temperature of a tubular reactor?

I have modelled a multi-tubular reactor performing a Fischer-Tropsch synthesis of alkanes and I was wondering about the stability of such a reactor. Even a very tiny deviation of the wall temperature ...
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1answer
52 views

Modelling reactor jacket with or without insulation, how to proceed?

I am currently trying to derive a model to help estimate as precisely as possible how much time can be saved by insulating the jacket of a reactor used for eating and cooling. EDIT: I edited my post ...
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0answers
20 views

Evaporating temperature of NH3

Considering a flooded evaporator (using plate heat exchanger - PHE). Cold NH3 liquid from a surge drum supplies to the PHE to cool down water from 30 oC to 3 oC. The evaporating temperature of NH3 is -...
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1answer
41 views

Calculating geothermal heat pump

So I need to calculate how big geothermal heat pumps I need for a building. Heat pump is used for heating and to heat used water. If I know how many kW's are needed for heating the building and the ...
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0answers
61 views

Does a closed loop biomass-fired cogeneration/CHP make sense?

I'm working on a project concerning electricity production using biomass, and we have seen that making use of cogeneration is very attractive in order to increase the efficiency of the installation. ...
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1answer
93 views

Thermal oil in Boiler not reaching desired temperature

The thermal oil Feroline U in Boiler is not gaining the desired temp of 240 Degrees. We have physically measured the temp using digital thermometer at a distance of 20 cm where the boiler temp sensor ...
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1answer
564 views

estimating the surface area of a steam coil immersed in a tank

I've been tasked to design a steam coil that will be immersed into a tank in order to maintain the fluid temperature above 25C (but not to exceed 40C), and I need to calculate its surface area & ...
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0answers
154 views

Choosing sides of a shell and tube heat exchanger for oil cooling

I recently took a quiz from POWER magazine that asked the following question: In a typical cooling system for lubricant oil in a gas turbine, which configuration is preferred to prevent leaks and ...
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1answer
22 views

Deciding on number of tubes to construct a heat exchanger

I’m a chemical engineering student and I’m learning about heat exchangers,I came across this question and had a doubt , Cold water is heated from 20 degree C to 85 degree C while hot process stream ...
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1answer
419 views

Process fluid flow in a fired heater

While I’m studying about a fired heater (furnace) in chemical engineering , I learnt that the process fluids enters from the convection section and leaves at the radiant section of the furnace. Why ...
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2answers
92 views

Valve first,then heat exchanger OR heat exchanger first then valve

In my exam, I was given 2 options to design a process. Assuming a saturated liquid coming out from the separator, A) should the stream pass through a valve to reduce pressure, then to heat exchanger ...
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1answer
138 views

Heat Exchanger Design- Cooling a gas mixture

I am designing a process heat exchanger to cool a gas effluent stream consisting of 70% Nitrogen 23% Carbon Dioxide and 7% Water (all mole percent). The stream is going to enter at 250 degC and 1....
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1answer
143 views

Most effective heat transfer in a vertical pipe with small top/bottom temperature difference?

What would be most effective way to transfer heat in the following situation? Specific conditions: A vertical cylinder or pipe, 30-100cm long, 5-10 cm in diameter, heavily thermally insulated except ...
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1answer
60 views

Maximizing radiator cooling while minimizing fan noise

I've got the following idea in mind. I have a water-cooled PC, I wish to minimize fan/pump noise by lowering their speeds, while maximizing the cooling that can be done. There is the simple solution ...
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2answers
96 views

Heat exchanger design guidance

I need to design a water to air heat exchanger with a blower for a small greenhouse as an engineering project. There aren't much design specifications - only that it must maintain a temperature of ...
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1answer
135 views

How to determine heat exchanger equation?

What is the equation to determine the inside surface temperature along the length of the counter flow heat exchanger?
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1answer
329 views

Can pressure drops in a heat exchanger shell side be super low?

i'm a chemical eng. student from Italy and i'm "sizing" ("setting"?) a heat exchanger to cool some octane with toluene. Is it possible that pressure drops shell side in a 1,2 pull-through floating ...
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1answer
122 views

Lifting 250 watts of heat using some heat exchanger/heat sink [closed]

I am new to thermal management. I want to lift about 250 W of heat from hot end of thermoelectric cooler/peltier cooler (TEC). The temperature of hot side of TEC is 30°C. I want to use some ...
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5answers
6k views

Radiators in series or parallel?

So let's say I have some heat generating machine be it a combustion engine or a fridge cooled by a fluid. I don't have a single radiator that is big enough for the amount of heat being generated but I ...
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2answers
70 views

Viscosity of select species at atmospheric pressure for very large temperatures?

I'm dealing with hot combustion products flowing through heat exchangers and I'd like to perform some calculations regarding the flow properties (velocity, temperature, pressure and density) as it ...
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1answer
447 views

Fluid allocation for shell and tube heat exchanger

I'm designing a shell and tube heat exchanger with a hydrocarbon stream (31.6% propane and 60.4% propylene) entering at 135F and 321psi, and leaving at 100F being cooled by water at 85F and 74.7 psi. ...
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1answer
603 views

Finding mass flow rate and exit temperature in heat exchanger stream

I'm working on a heat exchanger design project and I'm stuck at one of the first steps - energy and rate balance. In the problem, we have a hydrocarbon stream getting cooled by a water stream. We are ...
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2answers
165 views

Heat Exchanger Design - finding necessary variables

I'm working on a project to design a shell and tube heat exchanger. There's a mixture of 68.4% C,3H6 and 31.4% C3H8 being cooled from 135 $^\circ$F and 321 psia to 100 $^\circ$F and 285 psig. The ...
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1answer
41 views

Thermosiphon System

I am working on a project and I have some questions about setting up a passive heating system (thermosiphon) with a heat exchanger. I will have a main boiler with a coil of copper tubing inside. This ...
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3answers
6k views

Energy required to raise temperature of water flowing through a heater

I am trying to work out how much energy (ideally electrical heating) I need to put into a heater to raise the temperature of water from say 10 degrees C to 40 degrees C, if the water is flowing at 10 ...
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1answer
120 views

Simulation of Automotive Radiators

I'm going to simulate an automotive radiator . The method called $\varepsilon$- NTU , suggests following steps to calculate the heat rejection,$Q$, of a heat exchanger: 1-calculate $U$(overall heat ...
3
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1answer
135 views

Automotive Radiator Simulation

I'm developing a code to simulate thermal performance of automotive radiators. My results are 40% under-predicted. But when I multiply them to 1.6, they match completely. This is the graph that ...
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1answer
6k views

Log Mean Temperature Difference of a Counterflow Heat Exchanger

I am solving the following problem: A liquid-to-liquid counterflow heat exchanger is used to heat a cold fluid from 120 °F to 310 °F. Assuming that the hot fluid enters at 500 °F and leaves at 400 °...
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3answers
661 views

Can I use a pipe of any material other than copper in a counter-flow heat exchanger?

Why are copper pipes used in counter-flow heat exchangers? Could I enhance heat transfer by using a pipe made of any other material?
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2answers
1k views

Optimizing return temperature in a brazed plate heat exchanger

I have a brazed plate heat exchanger similar to these. I can regulate flow and temperature of water on the primary side of the exchanger to achieve the desired temperature of water on secondary side. ...
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2answers
306 views

How to size a heat exchanger for a shear thinning fluid?

To size a heat exchanger, I need to know (among other things) the Reynolds number (Re) as an indication of the flow conditions. The Re number depends on the viscosity. In a shear thinning fluid, I can'...
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2answers
232 views

Most efficient heat exchanger for dirty air/water medium?

It's been a long time since I went over heat exchangers and even then it was all theoretical. I'm looking for anyone with real world experience with different types of heat exchangers. I'm looking at ...