# Questions tagged [heat-transfer]

Questions relating to the transfer of heat via the mechanism of convection, conduction, or radiation, in forms of systems (or your device) attempting to obtain thermodynamic equilibrium with another system (the environment or your other device)

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### Constructive examples for heat transfer into pivoted components

Hello fellow engineers, i have a question for anyone who knows about the constructive elements of wind power plants. In certain wind power plants there is a rotor lockout disk (see picture), where the ...
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### Temperature profile in a pipe flow with Matlab pdepe solver

I’m currently trying to solve the heat equation for the Ohmic heating of a pipe flow using the MATLAB pdepe solver. The problem is described in the following paper: https://doi.org/10.4236/ojmsi.2021....
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### Parameters to characterize heat dispersion

I'm working in a team to model some production machinery in a factory. They ask me to find a way to describe and quantify the heat loss to be able to make an initial and approximate comparison between ...
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### Where can I find thermal conductivities of low carbon steels, i.e., AISI 1020 Steel in 8th edition of Perry chemical engineering handbook?

I need thermal conductivity data of carbon steel AISI 1020 for shell and tube heat exchanger design, but I cannot find it in Perry chemical engineering handbook, which is supposed to have all basic ...
1 vote
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### How much coal is needed to generate electricity for 1 person?

In one month a person uses $852$ kWh of electricity. Using a fossil-fueled vapor power plant, find how much coal is needed for one person. The assumptions are: Boiler efficiency of the Rankine cycle ...
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### Method to estimate indoor temperature from heat inputs, rather than A/C power from target indoor temperature

I'm looking to estimate the temperature drop I could expect in my house by installing cool roof tiles. The house does not has a regular air conditioning system. I have delved into HVAC references but ...
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### Heat losses of warm fluid in a cold pipe

I'm looking for a way to calculate/estimate heat loss in a fluid flowing trough a pipe for a length (l) and travel time for the fluid (t). The flow is intermittent and the initial pipe temperature (...
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### Plane strain delamination on bilayer material (conversion from material stress state to residual force and moment)

I have been reading the book The Mechanics and Reliability of Films, Multilayers and Coatings (https://doi.org/10.1017/9781316443606) on chapter 4.2 and got stuck in chapter 4.2 and 4.3. Suppose that ...
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### Any real heat engines based on the Carnot cycle? (or an equally efficient cycle)

Most practical heat engines are based on ideal cycles whose processes are different from the Carnot cycle (eg; constant pressure or constant volume heat addition instead of isothermal). I understand ...
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### Understanding chiller performance curves

Recently I was tasked with some chiller-related tasks and I need to understand the performance model. More specifically, I am interested in the EIR EnergyPlus chiller model. The chiller's performance ...
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Generating heat by stirring fluids I am interested in the direct conversion of mechanical energy into thermal energy as it was done by James Prescott Joule. For context: I was inspired by the danish ...
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### What amount of heat can aluminium box sustain?

So I want to install electronics inside 120 L aluminium box. The electronics have losses, which result in 50 - 150 watts heat. Can such size box contain these electronics without rising temperature ...
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### how do i calculate the heat recovery and outlet temperatures of a heat exchanger only knowing exchanger size and inlet fluid conditions?

all of the heat exchanger calculations i can find assume you are trying to design a heat exchanger to get your required temperature at the outlet or a specific Btu recovery. my issue is that i have a ...
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### Determine the temperature required for expanding or bending?

Is there any possible way to calculate the temperature required for a metal to expand or bend with dimensions? For example, take Mild steel with a length of 100mm, width of 150mm, and thickness of 2....
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### Contactless heating of levitated tungsten

I want to make a setup to melt tungsten. The best method I've come up with is using an induction heater to levitate and heat the tungsten, in a vacuum to prevent oxidation and limit heat transfer. I'...
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### Can a horizontal ground collector heat pump be installed on a 30% slope?

I'm considering what type of heat pump (air-to-water or ground-to-water) to install for a house in hilly terrain in Central Germany, to replace an old oil heater from the 1990s. The house has a 750 m²...
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### Calculating time to heat up a flowing fluid. Units not matching up

I have an electric heater that can output 915.4 kW of power. I have fluid (isobutane) flowing through the heater around 1 kg/sec. The starting temp is 172.5 °C and the required temp is 343 °C. The ...
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### When was the phrase "lumped thermal capacitance" first coined?

As per the title, when was the phrase "lumped thermal capacitance" to describe a particular way of analysing multi-component heat transfer and energy storage systems first coined, please? I ...
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### 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 ...
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### What is the ideal theoretical construction for an insulative box to keep my frosty beverages frosty?

What is the ideal construction for an insulative box to keep my frosty beverages frosty? I am interested in finding the theoretical maximum as well as the practical maximum. I was sitting on my back ...
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### I want to transfer heat from a solar concentrator to be stored in a sand battery , which heat transfer fluid is more viable , cheap and easy to use?

I am searching about connecting a solar concentrating system to a sand battery so I need a viable ,cheap and practical heat transfer fluid to distribute and store solar heat into the sand layers up to ...
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### 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 ...
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### Does 'Jet Impingement Cooling' always cool?

I understand that by using jet impingement cooling, we can achieve a high convective heat transfer rate, but there is also a stagnation region where the kinetic energy of the jet will be converted to ...
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### Why is there a MIN and MAX marking on a car coolant bottle?

This question was initially posted in physics stack exchange, then the mechanics stack exchange but I think it's more appropriate for engineering section instead. I've always thought the minimum and ...
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