Heating Definition and 590 Threads

Let's say it is 20 degrees Fahrenheit outside. If I have my thermostat set at 60 F, then each time my house dips below that temperature, my furnace should kick on and reheat it to 60 F. And the cycle continues... If I have my thermostat set at 68 F, then the scenario remains the same...

how to not short circuit an induction heating coil Just wondering about induction heating coils and how to not short circuit one. basically, if i hook up one end of the coil to the positive and one end to the negative (DC) i assume that i will be short circuiting the connection and also...

Hello, I have a question on rf heating in Paul trap. There are papers which say that in a Paul trap, the ion cloud eventually comes to a state of thermal equilibrium with the background gas. And at the same time there is a concept of "rf heating" in these traps. I am slightly confused about...

Hi all! I've been thinking of something lately. When an atom absorbs an incoming photon, the atom must gain some momentum in order to conserve linear momentum, right? Sort of like a totally inelastic collision? This momentum corresponds to some amount of kinetic energy and thus a raise in...

if i was to heat a gas [any gas] by 10 degrees celcius, using the smallest amount of heat energy, would i be better off heating the gas at constant pressure or constant volume. i think constant pressure, however i don't know how to justify my answer...:confused: cheers

i have set up an equation to get the heat transfer rate Q for a combined system where heat is transferred from a cylindrical outer wall set at 500 C. the wall heats a gas, which in turn heats a solid block of cylindrical metal positioned in the centre of the heated walls with a starting...

Tried to figure this out for a friend but couldn't quite get it. Here is the problem. For 3 hours one winter afternoon, outside temp is 0* C. A house is heated and kept at 20* C with the expenditure of 45 kwh. What was the average energy leakes in joules per second through the walls of the...

Hello I am not a science scholar but just a gifted middle-schooler. Anyway i was wondering, is it possible to heat water past super-heated steam? If it does then what does it turn into? And please don't mock me if this is a stupid question because I see the forums and see over-complicated...

Hi, Can anyone explain exactly why in field emission you get Nottingham heating? I can understand that you get joule/ resistive heating that makes sense. I can understand that you get cooling, the electron leaves the metal there is a loss of energy. But why does it matter if it is above...

If you heat up a glass flask why will the weight of the flask decrease slightly? The lab we're doing deals with the ideal gas law, so maybe it has to do with the mass being inversely proportional to the temperature? Or is there another reason? Also, what would happen if you heat up a flask...

The experiment is joule heating and I'm trying to calculate the filament resistance.1.) mass of the calorimeter cup 49.5g specific heat of the aluminum cup: 0.22 cal/kg*K mass of calorimeter cup w/ water 232.5g initial water temp. 20.5 C voltage across heater 7.3V current through heater 5A final...

Homework Statement i've been asked to compare the efficiency of a photo voltaic cell and a solar heating cell (an array of pipes). both will be exposed to a 150W bulb for an equal amount of time. Homework Equations for photo cell: P=IV for heating panel: P=fcT f=flow rate...

I am doing some basic heat calculations about a CW laser illuminated tungsten tip (which should be used for photoemission) - I started to play with the tip geometry to try and find a way to get more flux Watts/metre^2 onto the tip without it melting. I found that after solving the 1d heat...

Homework Statement The turbine produces current that is at 12kV. To lessen the problem of Ohmic heating, a transformer steps up the voltage to 138kV for power line tranmission. Homework Equations Np/Ns=Vp/Vs ?

Homework Statement How can you heat 1 \,\mathrm{kg} mineral water which is at a temperature of 0 \,{}^\circ \mathrm{C} to at least 60 \,{}^\circ \mathrm{C} with using 1 \,\mathrm{kg} plain water at a temperature of 100 \,{}^\circ \mathrm{C}? Homework Equations \Delta Q = mc\Delta T The...

I went to walmart and found these self heating drinks/soups. All you have to do is twist a knob and wait a couple minutes and its ready. After looking online i wasn't able to get a straight answer. Is there a difference between the warming chemicals in the soups vs. hand warmers. I'm looking...

[SIZE="4"]How can we boil water without heating it?

When heating a hydrate with a crucible and bunsen burner, why would this procedure, may not give good results for some hydrates?

Hello! The question about which oil that is the best to fry in, or to deep-fry in, should be examined, if it hasn't been already. Is it possible to set up a function b_f(T), where b is the "badness" of heating up a certain kind of fat f to temperture T? For example, saturated fat can be...

[b]1. I have a relatively simple question, but I can't think of the answer. A high bp hydrocarbon (X) is obtained by the fractional distillation of crude oil. (X) is then heated in the presence of silicate materials. only 3 new hydrocarbons were from this proces. All I want to know is what...

How many pounds of western subbituminous coal would be needed to heat the house (house requires 1,000,000 BTU), with a 60% efficient furnace? Subitiminous coal = 10,750 BTU/lb 1,000,000 BTU ____________ = 93.02 lb of coal. 10,750 Btu/lb And I am not exactly sure how...

I hope some one can help with this. 2 different but identical rated elements are used for exactly the same purpose, the only difference between the 2 is, one has the element bent into three outer coils and three inner coils, the other has four outer coils and four inner coils, the one with...

Problem 1: Homework Statement An ideal gas is heated reversibly at constant volume from T1 to T2. Calculate the entropy change of the system, the surroundings, and the universe. Homework Equations dS = dq/T (reversible change) and dq = CvdT (constant V) The Attempt at a Solution I know how...

I need to heat styrene to its forming temp of around 325 degrees F. I have a heating gun that operates at too many amps to use safely at home. So I found these temp controllers that don't use a lot of energy, but can get hotter then my blow dryer can, yet not as hot as the 700 degree heat gun I...

Basically, what we're looking to construct is a very small heating apparatus. We need to find an appropriate material to heat 28.26 cm sq., to roughly 150C or 423 K. We would prefer to use a battery mounted system but are equally ok with making some sort of plug-in system. We're not...

Q:can anyone explain heating effect E=I2Rt? and heating effect in a resistor?

why do visible light have less heating affect than infra red radiations ,in spite of the fact that photon of visible light have more energy...

I don't know whether this is appropriate for this sort of forum, but what would be the difference between microwaving standard tap water and boiling it in a kettle? Not just any water, but hard London tapwater (eek), with all sorts of delicious impurities. There's a marked difference in...

How do we Calculate Temperature & Time of Heating Element Heating Wire having the following Data : SWG 16(1.63mm) Specific Resistivity = 1.45 ohms-mm-3 Density = 7.1 gm-cm-3 Resistance = 0.685 ohms/Meter Weight = 15 Gram/Meter (a)In order to Build Heating Element using the above wire for...

Heating Wire having the following Data : SWG 16(1.63mm) Specific Resistivity = 1.45 ohms-mm-3 Density = 7.1 gm-cm-3 Resistance = 0.685 ohms/Meter Weight = 15 Gram/Meter (a)Please help me in this Project to Build Heating Element using the above wire for Making 2.5 KiloWatt heating Element...

HI, If you compressed 300 litres (about 12 moles) into a 3 litre cylinder which was already at 3,000 degrees C. Would the air reach this temperature in an instant? Im trying to get my head around this stuff about heat capacities and amounts of energy needed to heat materials. Please...

I was wondering if a heating device is installed in a building, and the building is good enough(no open windows). And would there be heat loss during the night time when all the doors are closed?

A generating station is producing 1.4e6 W of power that is to be sent to a small town located 7.0 km away. Each of the two wires that comprise the transmission line has a resistance per kilometer of length of 5.0e-2 \Omega/km. (a) Find the power lost in heating the wires if the power is...

I have a copper coin with a hole in the centre. The hole is a circle. If the coin is heated, the metal will expand towards all directions in and out, so the radius of the circle will be decreased. Correct?

From http://little-giant.com/pool_heating.html" (The section entitled "Little Giant® Sizing For Swimming Pools General Requirements" about halfway down the page) "Using these standards, the thermal conductivity is 7 BTU/Hr. Sq. Ft./°F or 140 BTU/Hr. Sq. Ft. 20°F difference. " Is this...

A central heating system has been thought to run with temperatures 80/60, and so the flow of water through the system has been calculated accordingly. Now it turnes out that it will run with 60/40 instead. In order to have the system deliver the same effect, I assume more water will need to flow...

hello all! If there is a circuit with only one heating element, how do we calculate the power it requires? According to the physics formula P=V^2/R, whenever you increase the resistance, the power it requires falls. However, I don't think that's right. Or is it? When R is increased, so...

What physically happens to the water when you heat CaCl2*2H2O above it's decomposition temperature 175 deg C? Does the water just vaporize? Or does it partially dissolve some of the calcium chloride in an aqueous solution and then boil away?

I have the following scenario and hope one of you can help me. I need to find an equation describing a heating process. A cylindrical metal of known dimensions and properties is heated from one side while the temperature of the other side is kept constant. I need to find the equation describing...

Homework Statement A barrel of diameter D at 20 degrees Celsius is to be enclosed by an iron band. The circular band has an inside diameter of d at 20 degrees Celsius. It is w wide and t thick. (a) To what temperature must the band be heated so that it will fit over the barrel? (b) What will...

Homework Statement A flask with a volume of 2.70 L, provided with a stopcock, contains ethane gas (C_2 H_6) at a temperature of 297 K and atmospheric pressure 1.01×10^5 Pa. The molar mass of ethane is 30.1 g/mol. The system is warmed to a temperature of 396 K, with the stopcock open to the...

HELP!:Real-World Heat Transfer, heating water ... [FONT="Arial"][FONT="Garamond"]Can someone help me with this problem? :confused: Suppose you have a carton of milk out of the fridge. It is most energy efficient to: a.) immediately return it to the fridge b.) leave it out as long as...

I'm very excited. I just finished ordering all the necessary parts to install a solar water heating system. With the likelihood of electricity only getting more expensive, coupled with the likelihood of my 3 children getting bigger, It seemed like a no-brainer. Who else has solar heat...

Hi, I would like some help/orientation about heating furnaces. The issue is around the heating of steel billets (continuous cast billets). The furnace needs to heat a load of 104 billets placed face to face along its longitudinal axis from ambient temperature to ± 1,150°C. Each billet has...

I'm making a coiled heating element from nichrome wire, and I was wondering how the coiling will affect the current. I have values for current needed for straight nichrome wire, but I believe coiling it will change the resistance. Thanks.

Is there anyone out there that can help me answer a question I have related to solar heating of water. - There is a 1" diameter x 4' long glass tube filled with water having an input temperature of 250F. - There is a 2" diameter tube surrounding it, 4' long, filled with water coming from...

Homework Statement In a circuit a 20-ohm resistor sits inside 104 g of pure water that is surrounded by insulating Styrofoam, there are additional resistors in the circuit. If the water is initially at temperature 10.5 degrees celcius, how long will it take for its temperature to rise to...

How does an infrared photon leading to heating?

newbie here, I've been searching many forums and cannot find the questions/answers I am looking for (close, but not quite). so, I am going to ask my question in a very specific, detailed manner. i want to use nichrome wire to make 8 heating elements. they will each be a single strand...

What would you guys say is an acceptable speed of water through a general heating system with radiators and such? I'm thinking between 0.4-0.8 m/s as optimal. I'm worried that sound might become a problem with higher speeds? And also pressure loss...