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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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hot wire anemometry

Hot wire anemometry can be used to measure the temperature of a wire in fluid flow. The voltage fluctuation across the wire is used in conjunction with an energy balance on the wire to obtain the ...
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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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how to design helical coil exchanger in electric heating furnaces?

Put one helical coil into electric heating furnace, the heating wires radiant heat to helical coil surface, the flow fluid exchange heat with coil. Could you tell me how to design the helical coil, ...
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1answer
25 views

Is there any practical way to partially absorb the heat from a refrigeration condenser

I have currently been experimenting with a phase change material to absorb the heat given off by the condenser in a small refrigeration system (about 1/5 hp compressor) and while it does absorb a ...
2
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1answer
55 views

What is the most common control method in Underfloor heating?

I am trying to research the common methods on an underfloor heating system that are available in the market. I know there are usually, On/Off control to control the flow of water into the pipe ...
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1answer
23 views

Operative Temperature in Underfloor Heating?

I am new to the Underfloor heating system, and a bit confused on the terminology for Operative Temperature. Is this the temperature that is measured by the sensor or is this the set-point temperature ...
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0answers
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How much can a double Peltier stack cool to -30 C?

I need a -30 C freezer. Inside volume 5-30 l. I've seen videos of double Peltier stacks reaching -50 C with one Peltier running at 12V and the other at 5 or 7 V. How big a freezer could such a stack ...
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2answers
50 views

Adiabatic paths

Can two adiabatic process paths intersect on a plot? This question is for 2 cases- 1.) Can two irreversible adiabatic curves intersect. 2.) Can a reversible & an irreversible adiabatic curve ...
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3answers
55 views

Why not drive an air source heat pump domestic heating system with an auto engine?

Theses are my thoughts on the question. I can't find an answer to "why not?". It there something I am missing, or are auto manufacturers simply too focussed on cars only? The automotive industry has ...
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31 views

Average Composite Wall Temperature

I have a composite wall with two different materials: concrete and steel. The left side of the wall has a hot fluid flowing against it and the right side of the wall has a cold fluid flowing against ...
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30 views

Tempreture distribution in a furnace

I am simulating a furnace as follows: Is it possible to capture temperature distribution in this furnace without designing intake fan? Which kind of boundary conditions can replace with intake fan? ...
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25 views

ANSYS Workbench: how to compute total heat flow across a contact?

In ANSYS Workbench, I need help figuring out how to compute the total heat flows (a) across a contact, and (b) across a surface named selection. To be honest I can't believe this function isn't ...
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1answer
59 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
72 views

how would one calculate the % of heat not absorbed by a heat sink?

I'm planning on building a plant growth chamber inside a sealed/insulated 55 g rain barrel, and I'm trying to figure out how much of the heat from my lights will enter the chamber, and how much ...
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4answers
94 views

what's the best shape for inducing condensation?

What would be the best ceiling shape for inducing condensation? I'm guessing it would a curve ︶ or V shape, but those are just guesses. (I don't have any background on thermal physics)
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2answers
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How do I correctly model a building to determine effectiveness of a heat source?

The problem domain You have a shelter that you use in a cold climate, and you want to provide it with some heat to take the edge off the chill. You already have a structure in a location which gets ...
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1answer
37 views

What about the natural convection heat transfer coefficient (*h*) at low Delta-T?

In a system I am modeling for personal research, I have a sphere (S) submerged in air (A), initially at the same temperature Ts = Ta. Then the temperature of air is slowly increased (or decreased), ...
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Ventilation requirements of a closed housing of a video wall

Our company builds rather large video walls that are driven by computers next to them. In one of our current project the size of the installation is 21 55" displays side by side in portrait mode and 4 ...
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4answers
61 views

Is it practical to make a solar furnace for small scale metal production?

Solar furnaces using mirrors to concentrate sunlight on a small area do not produce much power - perhaps 1kW per square metre of mirror - but can reach very high temperatures. From the earliest ...
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1answer
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Does ground conduct heat? [closed]

Does ground conduct heat or it acts like an insulator ? If yes then whats the conduction co-efficient or convection co-efficient ( in terms of convection heat transfer ) ?
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Nickel Chromium shape and gage

So I am trying to understand to myself the qualitative differences if any for size and shape of Nickel Chromium wire. If I have a system: Assume the following: The fan is blowing at a constant ...
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1answer
19 views

Heats affect on material permeation?

I know that heat affects material permeation (increasing it); but I have not been able to find much in the way of data other than biologically, on how it effects materials such as plastics. Does ...
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3answers
84 views

Pasta cooking time

How does time needed for cooking pasta (or any other food) change depending on stove power output (for simplicity, let's say flame size)? If it does... And why. Starting with the point that water is ...
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1answer
37 views

Why don't we use other substitute of cement while building a roof for thermal proofing?

Cement heats up like crazy. I live in the top floor and the heat is unbearable. Also it has a high carbon footprint. Why still cement is vastly used? When there are so many better alternatives?
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3answers
150 views

Should we protect our AC's outdoor unit from sunlight?Does it increases the durability of an AC and its refrigerant if it is well shaded?

My AC outdoor unit gets direct sunlight (no shading whatsoever) from morning to noon. Temperature normally soars up to 40 degree Celsius (I am from India). I have two questions: Is this bad for the ...
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0answers
24 views

Ansys or Solidworks for heat transfer

I intend to simulate heat transfer for the building (greenhouse). And I gonna use conduction through the walls with convention heat transfer (inside air - wall insulation ). After oserving the ...
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33 views

Need help in understanding an equation in solidification modelling

I am not able to understand the 2nd equation. These equations are to model a simple solidification of an alloy system, the equations are set on a region which is semi-liquid ( mushy region ) , The ...
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1answer
27 views

How to Pull Heat Quicker from a Thermo-Electric Cooler using an Aluminum Heatsink

I just purchased an aluminum heatsink that I am using to "wick" away heat from a Peltier; however, I was wondering how I can pull heat from the hot side of the peltier quicker. I have purchased large,...
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0answers
30 views

Using a Copper Waterblock or Aluminum Heatsink to Cool Water via Thermo Electric Cooler [closed]

I am attempting to create a ThermoElectric Cooler to Chill Water. I have thought of two options as to how I can cool the water: Some limitations of the design: The water is still, not moving. No "...
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1answer
40 views

Heat loss from the greenhouse to the soil

I need to find heat loss from the greenhouse. I know how to find heat loss through the walls and roof , but what about soil ? how to find amount heat conductivity loss to the soil ? I would be ...
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2answers
32 views

Heat transfer in a fin with constant volume and given efficiency

Assume we have a cylindrical fin which has the effective length of L and its efficiency is given by the equation: $$η=exp(-0.32mL)$$ where $$m=\sqrt{\frac{hP}{kA}}$$ where P is circumference and A is ...
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1answer
24 views

Area of Heat Transfer and Carnot Efficiency

Question: a) What is the area of the steel plate interface (in $m^2$) with the fluid conduit if the heat enters the steel plate at a temperature (T1) of 980K? Assume rest of the conduit surface (...
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0answers
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Does a TXV completely close when there's no thermal load whatsoever?

How is a TXV supposed to behave in a no evaporator thermal load situation (for example, evaporator fan completely off)? Would it completely close, not letting any liquid refrigerant get through (and ...
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127 views

Radiation “not working” in Solidworks Simulation

I am just starting out on Solidworks Simulation, and I am trying to set up a simple model to get a grasp on the module. I have a "Bulb" which is emitting thermal power while rigidly attached to a ...
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2answers
66 views

Blackbody radiation

If we are able to see an object in a certain color,that means it reflects the color.A blackbody is one which has zero reflectivity.Then how come it is not black always?
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2answers
94 views

Solving heat loss equation associated with solar trough concentrators

My project is about finding the efficiency of solar trough (cylindrical parabola) concentrator that will boil water in a pipe located at the focus (check picture please). In the process of doing so (...
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0answers
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Operative thermostat influence on heat fluxes

If the heat fluxes in a non-insulated building during the heating period are considered. How these fluxes (Primary energy from the heating system, internal heat gains from people, light and equipment ...
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108 views

Can a TXV prevent an evaporator from icing up due to no airflow at all in a parallel evaporators AC system?

I'm new here and i want to begin taking part in the community with my first question ever. Let's pretend that: We have an AC system which features two evaporators in a parallel arrangement placed ...
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22 views

How does one resolve/reduce unequal circuit heat load in evaporators?

Typically, evaporators are working by evaporating fluids, using an ohmically heated electrode in them. Here comes the problem that sometimes the heat generation is inequal. How could they be ...
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28 views

Best model to describe this scenario of cooling?

I have a block of CFRP (Carbon Fiber Reinforced Polymer) that has defects (back-drilled holes) in it. This sample was exposed to a source of heat for sometime (say 30 seconds) and the source if ...
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27 views

Working fluids at 1400C

There is a startup that is developing technology to store energy using the latent heat of silicon melting/freezing. The high energy density and high temperature (high Carnot efficiency) make grid-...
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1answer
151 views

Why is it more common to use ceiling fans instead of air pumps?

As the title suggests, why not use high-powered air pumps instead of ceiling fans to inject hot air from the ceiling down to the cold, bottom floor? I understand it may seem silly (especially since ...
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2answers
67 views

How can energy be added at constant temprature?

In the answer to this question: Difference between Saturated Liquid and Saturated Steam How can energy be added with constant temperature? Isn't the energy input itself a change of temperature? ...
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4answers
100 views

What colour of tarp will let in the least amount of heat?

Source: Low Tunnel Construction: How to Build a Mini Hoop House I have a small greenhouse that I want to keep as cold as possible in the spring. I plan to cover the greenhouse with a polyethylene ...
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1answer
77 views

How do generators in space transmit/ deposit energy back to Earth? [closed]

I've read about the idea of putting solar panels in space, or the already used electrodynamic tethers which gain energy as they move through Earth's magnetic field. The question I have is: How do ...
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1answer
169 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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2answers
107 views

How to calculate thermal load?

basically I am trying to build an oven that we are going to use to cure prepreg carbon fiber. I found a company that can make it but they are requesting the termal load in order to continue. This is ...
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1answer
37 views

Convection Heat Transfer

I am working on a problem at the moment and would appreciate some of your expertise regarding this issue. If you see the image below, I am trying to calculate heat transfer from a fluid entering a ...
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2answers
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Room with computer racks, with or without ventilation

I have a room of computer rack that with 2750 watt power needs, which according to this site, I need 9000 BTU/h AC. I'm deciding if I should put a vent in the room or not. When there's a ventilation, ...