# Questions tagged [thermal-conduction]

The tag has no usage guidance.

108 questions
Filter by
Sorted by
Tagged with
29 views

### Measure and calculate thermal properties of a material

Can someone explain to an EE how I would go about measuring the thermal properties of a material? I need to measure the thermal impedance, expansion, and conductance (k) of an epoxy, and the ...
18 views

### Thermal batteries: Can the max temp inside a battery be greater than the heat pump max operating temp?

I'm curious about thermal batteries, Let's say I have a heat pump with an maximum operating temperature of 100 °C, that is to say, the heat pump can "collect" thermal energy and heat its ...
• 101
25 views

### The Heat Generation and heat flux both in General Heat Conduction Equation

How would I incorporate both heat generated within and element and heat flux from external to the element in GHCE. For example, Let there be a thick wall of thickness 'L', with internal heat ...
17 views

### Battery thermal loss

A copper bus bar is subject to a short circuit current of 500 A for 10 s. The section of the bus bar, through which the current flows, has a length L = 50 mm and a cross section of A = 20 mm^2. ...
• 1
30 views

### 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 ...
21 views

### Calculating the convection coefficient of a green roof

as part of a course I have to calculate heat transfer through a green roof. I'm using Python to carry out an assessment over twenty years. The data I have are irradiance, wind speed, air temperature, ...
31 views

### How to calculate internal convection loss in a sealed container?

Say I have a box with a 1m x 1m x 1m interior wall dimension. The side walls and the floor are 10cm of styrofoam, with a thermal conductivity of 0.03 W/m K. The top is 1cm thick opaque plastic with ...
• 101
48 views

### Blower door DIY test

Since in my area there is no way to do a blower door test for a house, I was thinking to do a DIY blower door test. Here is my test scenario: Preheat the house before testing to have 10 degree ...
35 views

### Heat convenction through double pipe

I have a realistic scenario which involves a double contained PP plastic pipe which a section of the pipeline is placed outdoor. What I want to determine if insulation is required at all. The media is ...
• 11
64 views

### R value of a hole?

Suppose I have a room, 10x10x10m with insulated walls (R-value: 4) and a single double-pane window 1x1m (R-value: 0.35). Now the total thermal power required to keep the room at a desired temperature ...
• 133
1 vote
49 views

### Can $R$ value be estimated by change in temperature over time?

Suppose a closed sphere with a hull and an $R$-value of $10$ m2 K/W and a radius of $1$ m. Suppose the temperature inside of the sphere is Ti, the temperature outside is To. The inside temperature is ...
• 133
52 views

382 views

### Why does the author assume the temperature to remain constant, in this case, along the axial direction?

This is in regards to steady heat conduction taking place in a pipe. Within the pipe a hot fluid flows and heat transfer first takes place via convection to the pipe and then via conduction within ...
251 views

### What causes the temperature to drop at the interface when two slabs are brought in contact?

Consider two slabs made up of different materials which are brought in contact with each other as shown. Thermal energy is supplied from the left, and it flows through the two slabs towards right. ...
1 vote
158 views

### Time required for balls to cool down

Two balls A and B, made of different materials, having the same radius, are initially heated to the same temperature $T_i$ and then are kept in the same environment which is at a temperature $T_\infty$...
60 views

### Thermal Conductivity and Energy gain

I have a two part question: Part 1: I understand thermal conductivity as The measure of a material's ability to allow thermal energy transfer to it, from it and within it via conduction My very first ...
140 views

### What and why thermal diffusivity?

I understand the following properties: Thermal Conductivity: It tells how well thermal energy can get transferred to a material, from a material and within the material. A material with higher thermal ...
1 vote
123 views

### Best metal for solar energy collection in an evacuated tube solar water heater

I am building an evacuated tube array for a solar water heater and I am selecting the materials to use for the tubing and the collectors (the places connected to the tubing that help absorb the solar ...
• 113
629 views

### Examples of two dimensional heat conduction problems

Can anyone give me some examples from real life, where the heat transfer can be modelled as two dimensional. Also if one could explain why we can model it as 2 dimensional.
139 views

### Question regarding evaluating 1D heat transfer PDE

My question regards cooling of an object using 1D-heat transfer with fixed surface temperatures. First I need to find the solution to this PDE: Based on the conditions, I worked out that the ...
• 21
1 vote
111 views

### Equivalent Resistance Between Two Points in a Wye Network

I am interested in learning how to calculate the equivalent resistance between two points in a wye circuit for application to thermal networks (i.e. I'd like to calculate the equivalent thermal ...
• 31
1 vote
233 views

### Cold Plate Thermal Resistance

I am designing a cold plate that will have 4 Power Modules Mounted on it. The total power loss from the modules is 5000W(1250W per Power Module). I have simulated the results on ANSYS Fluent and ...
446 views

### Filling gaps in heatsink design to improve thermal conductance?

I am currently pondering modifying my laptop's heatsink and am curious whether I stand to gain any benefit at all. The CPU and GPU (similar heatsink design) reach high temperatures (90°C +) under load ...
• 143
1 vote
400 views

### surface temperature due to constant heat flux

Imagine a hollow cylinder with the outside surface exposed to air (convection). If there is a constant heat flux on the inside surface how would I calculate both the inside and outside surface ...
1 vote