Heating Definition and 616 Threads

I'm working on a project in which I have to build a tiny 4 cm long heater. I did this with copper-windings stuffed in a tiny steel rod. Now I know the power input into this heater is 0.368W, at constant voltage 1.5 volts and the resistance of the heating element is 6.1ohms for a time of...

Hi all, I've been toying with an idea lately and I'm wondering if any of you could help me out. Is there any method you know of to heat an area roughly 5 nm in diameter? I've thought about laser radiation for a while, but of course we are limited by wavelength. 5 nm would force us into the...

Hello! It has been years since I had physics at uni, and I have forgotten lots of it, so I need some help here. The issue concerns the underfloor heating pipes and how to reduce loss. Most conventional systems use insulation boards to slow down heat conduction towards the floor. Some...

People always tell me that microwave ovens heat food by exciting the water molecules in food. This is done by blasting food with 2.4 Ghz radiation, the people that say this, also say that the frequency that is used is critical because that frequency interacts with the water molecules. I wonder...

I have an airtight container, the "hot-box", filled with air from outside. I close the two valves to the outside air, and let the sun heat it up. Once it reaches a certain temperature/pressure: I open/unlock a one-way check-valve that leads to a shaded/water-immersed coil of copper tubing...

This one has me puzzled... using a variable power pack to heat an element - the powerpack is way overrated for the element (120A @ 12V secondary of transformer) so decided to build a smaller version. To get the element to about the right heat (glowing red) i set the large PP to about 25A and...

I have a question regarding "ohm level" in a heating element in the design of a device designed to vaporize a liquid. I thought I had a pretty solid understanding of this but I've been told that I was wrong. So, I thought that if you increase the resistance (higher ohm) in a heating...

I'm looking for heating wire (to ~200-300 degrees Celsius) that won't disturb a ~weakish applied magnetic field significantly - I would be wrapped it helically around a glass cell which is placed inside magnetic field coils. So if I had two parallel sets of non-magnetic wire attached and coiled...

Suppose we heat a pure substance in solid phase at a constant pressure corresponding to it's triple point data up to it's triple point temperature where all the three phases of the substance are known to exist in equilibrium. Will further addition of heat at the same pressure result in...

I have a question about an object heating up when electricity is applied. When putting electricity (say 10 to 15 A) trough a wire the wire will heat up because of it's resistance for electricity, right? But does anyone know how to do calculations on this? Like how to calculate how warm the...

What would be the best method for heating copper tubing via nichrome wire? Voltage is 10

If one wanted to heat an organic object, say a vegetable, for purposes of high speed capture of thermographic imaging using a flir camera to study surface defects, what would be the most efficient (read: fastest) method of non-destructive heating, rf (think microwave) or infrared heating coils...

Falling matter of supernova does "work" heating the core? A supernova core collapses and the rest of the star follows, inner layers arrive first, a shock wave wave forms? As outer layers continue to collapse and slow down is there a large radial time rate change in momentum as rapidly...

Hello , I have a rather odd question. I am trying to find a phenomenon that occurs in nozzles but am quite unable to name the phenomenon per se. The vague description of the phenomenon I remember is that when a supersonic flow occurs in a nozzle (or superheated steam), there is heat produced...

Homework Statement Consider the heating of a house by a furnace, which serves as a heat-source reservoir at a high temperature TF. The house acts as a heat sink at temperature T, and heat |Q| must be added to the house to maintain this temperature. Heat |Q| can of course be transferred...

Hello I am not an engineer or an electrician. I would like some advice on designing and building a 12 volt electric heating pad. I am thinking I would like it to warm to 150-200 degree in 3-4 minutes, that is just a thought. Thanks

Homework Statement I need to know what effect wire heating would have on the reading of the EMF of a battery, and how the heating effect can be reduced! Homework Equations V= IR The Attempt at a Solution Well I know that the heating effect increases the resistance in the wire...

Homework Statement If a steel plate with a hole of 10 cm in diameter is heated 35 degrees kelvin, what will the new diameter be? ##\alpha_L = 13 \cdot 10^{−6} K^{−1}##Homework Equations ##\Delta L = \alpha_L \cdot \Delta T \cdot L## The Attempt at a Solution If I understand the...

The kinetic energy of gas molecules or atoms is: (3/2)kTN/M where k is Boltzman constant, T is absolute temperature, N is avogadros number and M is molecular weight. The formula is derived from http://en.wikipedia.org/wiki/Kinetic_theory. Assume that the gas is steam with M = 18 kg/mol at 373K...

Greetings all, My first post here on this forum. I'm currently revising for exams and have got stuck on a question where I'm not sure where I'm going wrong...Question: 1g of iron filings at 500 °C are inserted into a sealed 20 litre vessel containing 1 mol of an ideal monatomic gas at a...

I received a handout at university that I believe could be erroneous. It states. "IR radiation has a higher potential to warm objects than UV light. Does IR therefore have a higher energy level?" It refers to E = hf Note it mentions 'UV light' but 'IR radiation', not written by a...

Homework Statement In a domestic heating system, a room is warmed by a 'radiator' through which water passes at a rate of 0.12kg s-1. The steady-state difference between the inlet and outlet temperatures of the water is 6.0 K. The radiator is made of iron of thermal conductivity 80 W...

A radiator in a domestic heating system operates at a surface temperature of 55 C. Determine the rate at which it emits radiant heat per unit area if it behaves as a black body ? why we did not square the temperature I mean ( 273 + 55)^4 please I need your help

Homework Statement You've been asked to draw a P&ID for a water heating system. 20 tonne/hr of water is to be pumped from the atmosphere into a heat exchanger at 1.6 MPa. Steam is being used to heat the water to 145 C. The heated fluid is then stored in a vessel, which is designed to hold 4...

Hello, For my setup I'm looking for a method to heat a small stainless steel plate (50x50x10mm(2x2x0.4 inches), AISI 304) to 900ºC (1652ºF). The plate is fixed onto the frame, so it can't be removed. I've found some induction heaters, but they were all too expensive. Anyone got some...

Coronal heating by "solar braiding" How the Sun's Corona Gets So Hot The phenomenon of "solar braiding," hypothesized 30 years ago, has now been validated by images from an orbital telescope. http://discovermagazine.com/2013/september/06-understanding-suns-energy NASA Telescope Observes...

I placed some polystyrene dishes in an oven. Now, the melting temperature of this material is 240C. And I was at a temperature of 85C. Although this is lower than the melting temperature, the dishes (35 mm diameter) still became deformed. Does anyone know the highest temperature this...

Yesterday I had a practical examination, and one question involves the heating of FeSO4.xH20 to get rid of the water of crystallization to determine the value of x. A crucible was used to contain the crystals. Just a few grams. I had found the value of x to be 7. And now a part of the...

Hi all, some background info, thanks for reading and helping! I'm working on a project, the portable device is to vaporize glycerol(300 C). In an attempt to maximize vapor production, I've decided to skip the experimentation and calculate the optimal specs for each part. Also pardon my...

I want to be able to make my headlight bulbs last longer. I know the main reason they burn out is the massive current surge when you turn them on when cold. I was wondering if you put a thermistor in parallel, then the current would be split through the thermistor reducing the surge...

Homework Statement 86.9g of liquid water at 304K is heated by 1.75A passing through 24.7Ω for 104s what is the final temp Homework Equations its been a while since i did physics so bear with me if i get something mixed up here q=mCs,pΔT q=ItΔψ ψ=pot dif so isn't that just V from...

so if i have 89.6g water at 304K and a constant p=1.00bar and i heat it by running 1.75A through 24.7 for 105 seconds what will the final temp be? im thinking i can take q=mC(Tf-Ti) and q=IT and I=R/V to say that Tf= (Rt/vCm)+Ti i can't rember that much about physics and this stuff...

So my question which part of the Em spectrum(sun) is responsible for heating of the atmosphere ? Is it visible or infrared or both ?

I have a 400 amp 0-40 volt dc supply, I need to heat a wire by wrapping it around two bronze/nickel pulleys 12" diameter , with one connected to the positive terminal of the supply and one to the negative. The wire being mild steel .148" diameter moving at a rate of 50' per second with the...

I'm doing a study that involves radio waves passing through organic matter and have come across several sources that state that radio waves may heat organic matter when passing through it (For example: http://www.mobilfunkstudien.org/downloads/peleg_wm_10.5923.j.biophysics.20120201.01.pdf)...

Homework Statement Liquid petroleum gas (LPG) is used to fuel SI engines. A typical sample of the fuel consists of 70% by volume propane (C3H8), 5% by volume butane (C4H10), and 25% by volume propene (C3H6). The higher heating values of the fuels are: propane, 50.38 MJ/kg; butane, 49.56 MJ/kg...

Hi! My text says that when the resistance is doubled, the heating effect is halved. Joule's law of heating states that Resistance is Directly proportional to Heat produced. I.E, R α H. ∴ 2R α 2H. So, shouldn't the Heat be doubled. Or, since the Potential Difference is constant, should...

I saw this video a long time ago and just assumed it was fake, but I just saw it again and honestly don't know how this is possible. Wouldn't the ice cube just instantly melt? https://www.youtube.com/watch?v=aLwaPP9cxT4

I am looking for a fuel for a torch to heat an experiment to 500-1200C. We do not want to introduce exterior sources of Carbon. H2 cannot be used as a fuel because excess H2 will also throw off the results. My professor suggested SiH4, but I cannot find any information on silane as a torch fuel...

How does one Photon heat one atom of Hydrogen? (One Proton, one Neutron, one Electron. If you'll allow) It looks to me that the solar energy (Photon) is captured by the field(s) between the Proton and the Neutron. It also looks to me that the Proton/Neutron field is complex and may capture...

Hello, I have Silicon Carbide heating elements which should be used with a Step Down Transformer or SCR as mentioned in the guide from manufacturer. I currently have a SSR available at hand, and was hoping it could be used instead. The Solid State Relay when connected to PID can...

2 Questions -- Heating room air, and fuel combustion efficiency Homework Statement 2 questions. In advance, i needed to translate it so i am sorry if it is states incorrect. I really did my best to do it right. 1. The density of air at 1 atm and 10.0 ° C is equal to 1.24 kg / m3. (cubic...

Homework Statement A vessel containing 0.33 mol of oxygen gas is allowed to expand at constant pressure while being heated. How much energy is required to raise the temperature of the gas from 300K to 500K? If the same vessel contains 0.33 mol of argon, calculate the energy required to...

Homework Statement How long would a 3.50 kW space heater have to run to put into a kitchen the same amount of heat as a refrigerator (coefficient of performance = 3.13) does when it freezes 1.46 kg of water at 21.4°C into ice at 0°C? m=1.46 kg c_water=4186 J/kg Delta T= 21.4°C...

Is it possible to create a portable steam unit similar to this but without the use of the a heating element from a stove. http://vimeo.com/42042554 If so?, briefly how would one go about this? I would like to create something identical but with it's own heating unit and be hand...

Hello, I have the following problem: I would like, from a tungsten filament which an electric current is imposed, find the temperature emitted from the filament (Joule heating) on ansys workbench. I have to study a thermoelectrical , but I can not find any tutorial. Does anyone have...

Hey all, First post, thanks in advance for any help. I see there is a lot of discussion on this site and others about nichrome heating elements. I apologize if my question is very similar to others, but I have not exactly been able to figure out what I need to learn/lookup to answer my...

When i heat up an object, the kinetic energy increases. But since kinetic energy can be converted into positive or negative potential energy when it vibrates, during the heating process how can we say that the KE increases and thus temperature increases since at different points of time, the KE...

I am using an heating element to heat the air in a closed container. Joule heating will give me the "heat generated at heating element." I want to know how much of it will be transferred to the surrounding air. Should I be using heat transfer due to all three modes ?

Hi, I am a designer currently working on alternative induction cooking methods. The question is, whether it is possible to have a flexible/elastic cooking surface (something like a mat, that would roll up, fold up, expand etc.) A project similar to this, is here...