Heating Definition and 616 Threads

  1. S

    Heating a sealed glass bottle of liquid from 20'C to 90'C

    Hi I have people heating liquids in sealed glass Schott bottles in our lab if they cannot find any metal containers in our lab. These are 1 liter bottles they are approximately filling to 500ml with very aqueous solutions. The bottles have not actually broken one, but Schott advises not to...
  2. P

    What is the process called of heating alloys to High temperature for strength

    What is the process called of heating alloys to Hightemperature 10,000f+ and making them many times there normal strength? do most uivercitys have such a machine? I read about it years ago in New scientist magazine, any help would be great Andrew Perry
  3. T

    Speed controller with a heating element?

    I use a popcorn popper to roast coffee beans. I'd like to be able to vary the heat of the heating element (as inexpensively as possible). My thought is to connect into the internal wiring of the popper to the heating element and run a wire out to connect to some type of external controller...
  4. J

    MATLAB Simulating Metal Plate Heat Variation with Matlab

    I have to simulate in Matlab the variation of temperature in a metal plate/block, heated at just one end. One suggestion I received is that I have to use partial differential equations and the energy balance law but I don't know how to start. I study computer science, so physics is a bit off to...
  5. P

    The Mystery of The Stove Top Heating Element

    This has been bugging me and I just can't seem to figure out a solid answer. My electric stove has different sized heating elements where the size comes from just a longer heating element. It looks like this: http://www.sausagemaker.com/ProductImages/41516.jpg When I measure the...
  6. A

    Microwave/laser heating on small atmospere area

    Background: I been reading some articles about creating massive solar farms in space, on the moon, etc. and sending the energy down to Earth by microwaves or laser. Question: Wouldn't this EM radiation create a kind of thermal "column" and some nasty weather because of the constant hot spot?
  7. L

    Colour of inox steel surface upon heating

    If you heat inox steel in presence of air, up to a specific temperature, you get a yellow colour of the metal surface; increasing the temperature it becomes red; still increasing, blue. Is it due to the formation of oxide layers of different thickness? Which effect is responsible of the colour?
  8. S

    Heating water flowing through Copper tube

    Hey guys, Im designing a system where water flows through a copper tube or coil where it is heated and sprayed out the other end. My question is, how does the length of the tube/coil play a role in this heat transfer problem? What I would like to do is pass the water through the inlet at a...
  9. P

    Calculate heating element size

    Hi everyone I need to heat up an area 0.5m^3 (100cm x 100cm x 50cm). Would anybody know of any formulas I could use to calculate what wattage heating element id need to heat this area up to 100 degrees C within say 30 minutes. Thanks
  10. R

    Stagnation Point Heating - enthelpy at the wall

    Using the Fay-Riddell correlation, I can solve for the stagnation point heat transfer but I'm running into a snag. I'm doing this for a thermo-chemical equilibrium assumption. I'm confused with the enthalpy at the wall. I'm assuming a wall that is not adiabatic, but at some wall temp Tw. If I...
  11. C

    Ohmic heating to heat hockey stick blade glue

    I am an ME, looking for resources or advice to assist my team in designing an ohmic heat source. The device will transport hot air with a small fan. We will be utilizing a 120VDC power source. This heater must produce temperatures in the range of 500-1000F. We are anticipating using a wire...
  12. A

    What Factors Affect the Energy Converted to Heat in Radiant Heating Systems?

    I wish to design several systems of radiant heating that use both transfer of heat and friction heating of the transfer fluid which will be some grade of oil (which can handle a wide temperature range and has reduced equipment wear). What I need is to know is the energy turned into heat given...
  13. T

    What would the temperature limit of heating metal block?

    I have this problem and it's something that's been annoying me all day that I just can't get my head around. Imagine a metal block, in direct thermal contact with a heating element and "the surroundings"; but the heater and "the surroundings" are not in direct thermal contact. (I'm supposing...
  14. P

    Induction heating theory clarification

    Hi all, I'm trying to understand induction heating, specifically if there can be inductive heating without a coil, simply power applied through a hairpin-shaped resistor. Imagine a big hair-pin-shaped resistor with power applied to one leg - near the bottom of these legs are small metal...
  15. E

    Heating with Microwaves: An Efficient Way to Warm Your Home?

    Could it be possible to heat the people in a house with long wavelength microwaves rather than heating all the air in the building ?
  16. M

    Does electric heating violates the laws of thermodynamics

    hello, we have learned that according to the laws of thermodynamics that the efficiency of any machine should be less than one because of the passive components in it. in an electric heating machine all the input electrical energy is converted to heat. Does this make the electrical heater as an...
  17. T

    Induction heating of a cylinder

    Hello! I am making som calculations on induction heating of a metallic cylinder inside a solenoid through which an AC current passes, but the answer I get seems to be completely unrealistic (10 kW with a 50 Hz, 5 Amps, 230 V rms), but I can't seem to find my mistake. What I think is...
  18. T

    Maintaining 120 Degrees on a Chrome Roller: Electric vs Water Heating Solutions

    Can anyone give me ideas on how to heat a metal chromed roller to maintain 120 degrees on the outer surface. I currently use a pressurised water heater and a hollow mild steel chromed roller with a 12.5mm thick wall. Can it be done with electric rather than water? The roller has a diameter of 6"...
  19. V

    Heating up water- energy required

    Is the below calc right? Input electrical power for heating- 4KW Heating time= 20 hrs = 72,000 sec Input energy available= = 288,000,000 J Qty of water to be heated- 7,500Kg Specific heat of water- 4,200 joules/Kg/deg C Delta T in Celsius that can be achieved with the said input...
  20. J

    Heating Mercury Affecting Floating Lead

    Homework Statement A flat, uniform cylinder of lead floats in mercury at 0 degrees Celsius. Will the lead float higher or lower then the mercury temperature is raised? Homework Equations None. The Attempt at a Solution Since the mercury is heated, then the density will be lower...
  21. K

    Periodic heating of a glass of liquid

    So my question is if I periodically heat some glass of liquid from an arbitrary source, hence providing a driving frequency for the system that will give rise to a phase lag between the temperature of the liquid and the incoming heat from the source, how can I show that there will be a possible...
  22. S

    Heating element temperature - correct calculation?

    Hi everyone. I am not sure if this is the best place for this question but here it goes. I am looking to build a small heating element to position in the base of a tank of water. I want to avoid any boiling of the water so want to keep the temperature of the wire at around 90 degrees C. The...
  23. A

    Control Of Joule Heating Effect In Tungsten Wire.

    How can I accurately control the Joule Heating effect of a length of Tungsten wire to certain temperature ranges? The tolerance would have to be no more than a maximum of +/- 2°C. Would I require alternating or direct current and/or any other associated instrumentation? I have little or...
  24. T

    Estimation of 1000w heating element contact temperature

    Hi All I recently purchased a 1000w heating element for coffee cups, http://www.ebay.com.au/itm/110668421004 that I will be using on a 240v AC source. I would like to know if a cup out of silicone will withstand direct contact with the element? From what I am reading normal silicone...
  25. Pengwuino

    Voltages in bathroom appliance heating elements

    I'm doing a lecture on electricity for my class and one of the students at the beginning of the semester wanted to know how a curling iron works. So I've never ripped open a curling iron but I assume there's coils of wires within the little 'arm' parts that rely on ohmic heating. However, since...
  26. M

    Does Blocking the Top of a Heating Element Direct Heat Horizontally?

    I have a heating element. This heating element is placed on a wall. If I want the heat to be supplied horizontally would a relflector blocking the top of the heating element work? to prove this are these two statements below correct?? 1. Heat rises so by blocking the top of the heating...
  27. K

    Energy requirements for heating a liquid under different pressures

    Hello, I am interested to know how pressure affects how much energy is needed to heat up a liquid, if at all. For example, does it require less energy to heat up water at sealevel compared to the energy needed to do the same at the bottom of the sea? Cheers, klillas
  28. M

    Calculate Temperature of S/S 304 with 4KW Input

    If I had an input of 4KW with Material S/S 304 Density(0.29 lbs/in3) Specific Heat(0.12 BTU/lb/°F) What temperature would the S/S level off at when the 4KW is inputted?? If I am missing any info to help solve this let me know...
  29. M

    Affordable Alternatives to Silver Solder for Heating Element Joining

    Right now I am using silver solder to combine heating elements on a copper pipe. This is becoming very expensive. Any other means/materials I could use that could get the similar results as the silver without the high cost!
  30. Z

    Induction heating modeling in Ansys

    Hi I'm trying to preform a simple model of a ferromagnetic bar which has a coil wrapped around it. The bar has a 4×4 cm base and is 15 cm tall, the coil has an inside radius of 29 mm and outside radius 30 mm and a height of 10 cm. The goal is to find the eddy currents in the bar, generated...
  31. B

    How to integrate Joule's First Law (Joule Heating)?

    Homework Statement I know the current distribution through a rectangular cross section of metal. It varies only with respect to y. I need to find a heating function for the metal. (This is only the relevant part of a larger problem). Homework Equations Q=I2R The Attempt at a Solution I...
  32. C

    Making Bar Magnets: Heating & B Field Placement

    If I wanted to make bar magnets would I heat up the metal and then place it in a B field of a solenoid and then cool it down in the field to keep the magnetization? It seems if i heated it up first the atoms would be more easily aligned in the B field, And then cool it down to preserve this state.
  33. bcrowell

    Mechanisms for heating of water by microwaves

    There are four qualitatively different effects by which microwaves can heat matter: dielectric heating ionic conductivity electronic conductivity hysteresis In most foods, 1 and 2 are of approximately equal strength. 3 can occur in soot particles formed when food burns. In pure...
  34. G

    Why is a high permeability desirable for induction heating?

    The resistance per unit length of a conducting wire is proportional to the square root of the ratio of permeability to conductivity. The power generated as heat may be expressed as I-squared x R: also as V-squared / R. In induction, the EMF induced is determined by the rate of...
  35. A

    Maser Heating: How Far & How Much?

    Would it be possible to use a MASER to vaporize a hole in a cloud? How much would the current best MASERs spread out over a mile? What's the farthest a MASER could be from an an object and still heat it up?
  36. P

    What is Ion Bernstein Wave Heating?

    Hi Everyone! I am working in a plasma propulsion lab this summer, and am trying to get a better understanding of IBW heating. Very few papers on the academic databases actually describe what an IBW is, and how it heats, so I was hoping to open up a discussion about the topic. Here's what I...
  37. H

    Looking for resistive heating pad supplier

    I am looking for some small 30W resistive heating pads, but can't find a supplier who can deliver them quickly. I would prefer somewhere that I can simply order them off the shelf -- anyone know of a company that manufactures/carries something like this? Thanks in advance!
  38. G

    Microwaves and heating on molecular level

    hi i am currently dealing with this problem here: i have some water and want to heat it up with microwaves. how do I determine the change in temperature of the water when i just know the characteristic features of the radiation? is there an equation for it? of course this process is not...
  39. J

    Efficiency of the heating process

    120MJ of heat are used to heat up a 1100kg component from 22oCelsius to 180oCelsius, in 1 hour, prior to heat treatment. If the specific heat capacity of the components material is 500J/kg, calculate the efficiency of the heating process. Please could somone give me the equation that i need...
  40. M

    What is the Most Efficient Way to Heat a Small Object Using a Battery?

    i hope I am asking this at the right place i just have a few questions... why does it take so much power (115v) to heat up a small coil(heating element) roughly the size of a spring in a pen. what could get just as hot, maybe a resistor? i have a 18 volt battery from a drill and i need to get...
  41. J

    Setting up Fick's Law with Internal heating

    I am solving for the flow of heat on a resistor, say it has a cross-section in the x-z plane and is extended along the y-axis. Fick's Law with internal heating is simply \frac{\partial T}{\partial t}=A\nabla^{2}T+BQ My PDE text gives Q as power delivered per unit volume. So substituting in...
  42. V

    How to make a radio frequency heating apparatus?

    Hi! I need to carry out radio frequency heating (heating by radio waves) for a reaction. Can anyone please help me design a circuit for that?
  43. V

    Radio frequency heating apparatus

    Can anyone help me/suggest some links to make a radio frequency heating apparatus? I need to carry out radio frequency heating (heating by radio waves) of some reactant samples. Please help..
  44. G

    Question about heating a fluid through a wall

    Hello, I am working on a project this summer and I have run into a problem that I need a bit of help with. If I heat a fluid (water or some refrigerant) in a pipe with cross sectional area A and the fluid has a velocity V through the pipe then how long does the pipe need to be for a given heat...
  45. M

    I want formulae for Induction heating

    hi i want formulae for induction heating .. 1) dept of heating 2)power loss per unit volume also for dielectric heating please help me ..
  46. C

    Heating oil: effective or real output/yield (per liter)

    Heating oil: effective or "real" output/yield (per liter) http://en.wikipedia.org/wiki/Heating_oil" says that which is about 11 kWh/L. I was given an unbiased (but not necessarily correct) number that the effective output is about 8 kWh/L ... ... and a potentially biased number (from a...
  47. R

    Super heating water in a microwave oven

    Is this caused by a lack of nucleation for the gas pockets to be formed or the uneven heating of the water? A clean cup isn't proviingvery many nucleation sites and is it this combined with the even heating meanings the chance of the super heated molecules reaching these sites is reduced is...
  48. B

    What Is the Temperature of the Sun Based on Water Heating?

    Homework Statement In open wide pot exists a certain amount of water, which has mass m=6,5 kg, which free surface has S=960 cm^2. When this amount of water is exposed to Sun, then its temperature gets higher by deltaT=10 K for time t=30 mins. What is the temperature of Sun? Sun radiates as...
  49. T

    Effect of Pressure on Heating (not boiling) water

    I understand that if I apply pressure to water in a closed system, the boiling point increases. So at atmospheric pressure, it boils at 100 degrees C and at 100 PSI, this number increases to 164 degrees C. In my experiment, I'm using the sun to heat the water as it runs through a solar water...
  50. S

    How Long Does It Take to Heat an Object to 100 Degrees C by Convection?

    Homework Statement Want to heat an object of given length, 1cm, from both sides by convection. It is at a uniform temperature (5 degrees C) and is to be heated in an oven (200 degrees C) from both sides until its center reaches 100 degrees C. (the density of the material, its convection...
Back
Top