Heating Definition and 590 Threads

Does anybody know how this works? https://www.youtube.com/watch?v=aLwaPP9cxT4

hi all :) im trying to heat a metal wire in my experiment and because i don't have a heat sensor camera or an oven,... i thought of using a sand bath to control the heating temperature. is it possible to heat a wire upto 500~600 degree celcius by sand bath? (or whatever bath that may be...

Given: a two-story residence currently with separate basement and attic gas forced air furnaces-chillers. The basement furnace is a recently updated high efficiency (96%) hybrid heat pump/aux gas heat at around 80,000 btuh (out); the attic unit is much less efficient and maybe 60-70,000 btuh...

Hi everyone. I want to heat a piece of Rubber by embedding copper strips or wires in it and passing electricity(120V - 2.5Amp) through it. The room temperature is 0(zero) deg Celsius and i want to heat the aluminum block(5" x 5" x 1") to 10 deg Celsius(Not more than 10 deg). Question...

A rigid tank has a volume of 0.01m3. It initially contains saturated water at a temperature of 200°C and a quality of 0.4. The top of the tank contains a pressure-regulating valve that maintains the vapor at constant pressure. This system undergoes a process whereby it is heated until all the...

Hi, As part of my final year project I have to heat air within an exclosed environment (i.e. a 1m x 1m x 1m insulated box) to test the effectiveness of using phase change materials to regulate ambient air temperature. To do this I need to slowly heat the air inside the box at a rate that...

Homework Statement What happens when gas is heated? Is all of the absorbed energy converted to kinetic energy? or is some of the absorbed energy converted into potential and some into kinetic energy? Homework Equations The Attempt at a Solution My teacher said the correct answer...

Curious question, figured what better place to ask than the physics forum. So I just picked up a used hot tub. Was running great when I bought it. Filled it up with water, turned it on, started its cycle. It can take over 24 hours for the tub to reach 102 degrees. There's a 12 inch...

Specific Heat Capacity Lab I conducted a lab where I heated 100ml of water using a heating coil with a current of 4A passing through it. The temperature data turned out beautifully, with the temperature rising evenly until it plateaued just under 100 degrees celsius as it began to change phase...

If we can heat a gas so that the electrons "fly" off, can we heat one so that the protons do?

Hi. Im trying to measure the efficiency of a heat engine. I therefore need to work out what the input energy is to the heat engine. I have two problems. Firstly, how should I measure the heat going into the stirling rather than the heat coming out of the heater. Is it ok to measure the...

I used a propane gas tank to add thermal storage to my out door wood burner. The ethyl mercaptan residue mixed in the water and the smell about drove us out of the house. I added bleach to the tank which did a fair job of killing the smell, now I need to know how to neutralize...

Homework Statement How do I calculate how hot a metal object will get if it's just left to be heated up by the sun? Homework Equations The two equations that i know of would be the specific heat capacity of the metal: Q = mCpΔT And the radiation equation: Q=εσAT^4 The Attempt at a...

how can i obtain a thermophotovoltaic device to convert solar heat from a parabolic reflector to electricity? or is there any other better device that can convert heat directly to electricity?

I need to construct a heating element powered by 9V that needs to reach 400 C. How do I figure out what length of wire I will need. I will most likely be using nichrome or kanthal A1

looking to find out what it take to retro-fit a small elementry school ( 3,000sqft) with new base board heater or small boiler. to calculate the different fuels (electric vs natural gas) and amounts used? In NW: older rates (just for calculations) electric is $.0463/kWh vs 1st 2,000...

Hi guys, For today's lunchtime challenge... If I put 1kw of electrical energy into a heating element and get X amount of heat out, why can't I put ~X amount of heat into the element and get ~1kw of electricity out? ( I accept less than 100% reverse process ability) what's the mechanism...

Homework Statement I'm struggling to explain why for an ideal gas at constant pressure heating by burning fuel is equivalent to reversible heating. I know that all forms of work on a ideal gas are eqivalent but don't know why. Homework Equations The Attempt at a Solution

Homework Statement Initially, 2 kg of water is at 250 Celsius and it exists as a saturated liquid. It is now isobarically heated until all of it is converted to saturated vapor. Find final temperature and volume. Homework Equations Thermodynamic tables and the use of interpolation...

I know there are some obstacles to overcome, but I'm wondering how good the idea would be in theory. First though, a few sub-questions before the main one: 1: The radiation in a microwave food cooker is like a laser (hence the 'hotspots' in food). Is it possible for microwaves to more...

Homework Statement Hi! I apologize in advance for my knowledge of vocabulary in this topic:) OK, so we have a Melde-tube 55 cm long, T=293K, with the top of it open, and a 20cm Hg part cutting off 30cm of air when is equilibrium. The original problem asked how much we can heat the air so...

lil question for anyone who may have any suggestions, I am livin in a house at the moment with my partner and 13 month old daughter, the house is single glazed and is poorly insulated, now winters just around the corner and if last year is anything to go by, then were in for a cold one again...

Hi , I have a question that's confusing and difficult to comprehend " A heating element is placed on the floor and bag of water is placed over it. At present, A power of 300W is applied to the heating element. Peter, the technician, wants to increase the rate at which the water in the...

Dear all, I have a piece of brass material at high temperature (around 300 Celsius) and I would like to know how can I measure the heating power stored by this piece. the piece is designed in a way that we can flow a fluid through it. For low temperatures ( below 100 Celsius) it is maybe...

This is an interesting subject. There have been discovered very large (up to around 100 kpc) hot (10^7 K) intergalactic gas clouds within galaxy clusters. A simple calculation based on the density of the gas clouds in question and the emission rate of the hot gas shows the gas clouds should...

Hi If you were making MgO by heating Mg in a crucible with a lid on, why might the MgO escape when you lift the lid. Isn't MgO a solid? thanks

I want to build something like http://www.radioshack.com/product/index.jsp?productId=2911246", but much smaller and only heating a coil up to 185 C. It would need to last at least an hour, but be as compact as possible. Any suggestions?

Homework Statement A heating coil is to be made, from nichrome wire, which will operate on a 12 V supply and will have a power of 36 W when immersed in water at 373 K. The wire available has a cross-sectional area of 0.10 mm². What length of wire will be required? (Resistivity of nichrome at...

Hello, I want to do a test heating a hot dog in a tube using a Magnetron from a 900W Microwave oven. Before doing the test I would like to know if there is any reasons not to mount the magnetron antenna on top of the metal tube, or on the side. (Please see attached picture) Also, will I...

I keep thinking of doing something with Solar Power. (Southern UK) The easiest, conceptually would be very basic homemade thermal panels but then there's the problem of how to use the hot (warm) water. That involves plumbing and a special hot tank. Once you've gone for that, you may as well...

Hi guys, I am of a Mechanical Engineering background, however my dissertation has a largely optics based focus, and I am struggling with understanding the heating effect of a Laser. I will be using various wavelength ND:Yag lasers, and will be focussing them onto a target material, which...

I have a small steel cylinder centered inside a larger steel cylinder. The remaining space is filled with 60% silica sand and 40% air. I am heating the larger cylinder in a furnace at a known heating rate and I want to calculate the theoretical rate of heating of the internal cylinder. This is...

Is there an equation for the rate of heating on a surface at any time, and at any angle?

Why heating water at 90C takes longer than heating water at lower temperatures such as 70C?

Hi, I'm having a problem building a sort of pool heater for my backyard. I've assembled some black tubing into 9 spirals, making 3 groups of 3, and then attaching the groups of spirals to a manifold, to supply equal pressure to each group, see pic below. The water is pumped up to my...

I am currently constructing a supersonic rocket and am trying to empirically calculate the heat transferred onto all different parts of the missile body to know what materials to buy. However, I do not know how to calculate the heat transferred onto the fins of the rocket as it travels (the fins...

When some certain object (asteroid, aircraft, spaceship and etc.) moves at great velocities into Earth’s atmosphere it heats. The faster its moves and the denser is the atmosphere the heater this certain object becomes. This is simple is clear. Now, is it possible somehow to predict or calculate...

Hello everyone, I think this is very simple. I have very little knowledge about electricity and would like to understand a bit more about a simple experiment I was recently shown: Basically a steel nail was connected to an electrical circuit at both ends. The two electrical contacts to...

question For a plane wave of the form E(z,t)=Ee^i(kz-wt) and B(z,t)=Ee^(-kz)*e^i(kz-wt) write down the time-averaged ohmic heating loss per unit volume for any z. Homework Equations J=\sigmaE Maxwell's equations for linear media The Attempt at a Solution not sure where to start, i...

sorry re posted in homework...

Hi, I'm a heating engineer. part 1: I typically install 300 litre to 100litres stores of hot water (to be extracted at 40deg c for low temp heating). I understand that the specific heat capacity of paraffin wax is something like ten times that of water. So can I play around with a...

Homework Statement i am trying to make an air flow meter using an heating element which i got from an iron..basically i have thought of inserting the element into a duct through which i will pass air using a blower,to connect the element with a 12v supply in series with a ammeter...thn i...

Homework Statement in verifying joule's law of heating namely the first law that is law of CURRENT " HEAT IS PROPORTIONAL TO SQUARE OF CURRENT" MY TEXTBOOK MENTIONS THE FOLLOWING LINE the initial temperature of water is measured as THETA1. let W be the heat capacity of the calorimeter and...

Design of heating element: Supply Voltage: 220V/3Ph/60HZ, Power: 9KW Resistance= VXV/P= 220X220/9000= 5.4 Ohms, But when physically when measure the resistance of wire using multimeter it is showing 17 ohms. Can you explain why there is differnece in practical and theortical value...

Why is it that when you heat an object, it takes longer compared to cooling it?

Homework Statement I have two identical volumes of gas, and I heat them both to 100 C, one under constant pressure, one under constant volume. Which has more internal energy after the process? The attempt at a solution I believe that they both have the same as the extra heat you have...

So this is my current problem: I have block of solid material that separates two bodies of gas. The temperature of all three is known (and presumably all different). The solid material is also being heated, equally throughout its volume. I want to know the instantaneous heat transfer...

When going through topics on melting and freezing, i came across 2 graphs of slightly different curvature for both the heating and cooling of naphthalene. The ending part of the graphs are the ones that confuse me, whether slope upwards or downwards. Most graphs in the internet just show...

If we somehow could apply a significant amount of heat to the black hole, what would happen? Photons get redshifted near the event horizon, so how energy transfer towards black hole goes?

Hi guys, is this right? Homework Statement A mole of nitrogen is heated at constant external pressure of 1 atm from 25° C to 100° C. The heat capacity of nitrogen is 29.1 J/mol·K. Calculate ΔSsurr 2. The attempt at a solution delta_S=Q/T = -1*29.1*75/373=-5.85 J/K (heat...