Heater Definition and 192 Threads

I thought Wolfram Alpha might be able to help me with this problem, however so far I have had no luck, with the website nor their community: I have a 1230 gal pool heated by the sun to 70 degrees F, If I remove 30 gal and let the 30 gal be heated in my solar collector to 100 degree F, and...

Ok, I'm rather new to electronics as I've only taken a high school-level electronics class and that was several years ago. Right now I'm trying to put together a low power heater consisting of a length of nickel chromium wire and a DC or stepper motor. What I'd like to do eventually is be able...

Hi, I want to use a variac that I've got (4A rating) to power one of these: http://www.omega.co.uk/ppt/pptsc.asp?ref=FGS_FGH_FWH&Nav=heam02 but a 240V version. The problem is I can't figure out if the variac that I've got has sufficient grunt to do it (without frying me, the variac or...

Homework Statement A well-insulated electric water heater warms 137 kg of water from 20°C to 45.0°C in 16.0 min. Find the resistance of its heating element, which is connected across 220-V potential difference. Homework Equations R=V/I The Attempt at a Solution Not sure how to...

Homework Statement A water heater gathers energy with the help of solar collectors on the roof, where water circulates in pipes and are provided heat from the sunrays that get through a transparent cover. The water is then pumped down in a tank inside the house. What area must the...

1.If i apply voltage 440volts at L1,L2,L3 the K3 (contactor) will get on automatically? 2.How this SSR work and what should be the voltage at 4,5,6 and 7,8,9(X1 terminals)? The main thing i want to ask is how this heating 1 and heating 2 gets ON and OFF and at what voltage? Thank you.

I want to make a water heater from an insulated 50 gallon bucket, but I could easily use a different size container. I tried doing things the easy way by just looking for an immersion heater than can be plugged straight into an outlet, but all I can find are travel heaters for making coffee...

Homework Statement Need to heat 30mL of water from 20C to 40C in 1 min(60s). Using 6V battery and Nickel Chromium alloy Nichrome wire that has a resistivityabout 10^-6 ohms/meter. So you use the battery and the wire to build a water heater. Batter has no internal resistance. Homework...

Is it better to leave the heater going constantly or turn it off when you leave the house? I've heard people tell me that it takes more energy to bring it back up to temperature every day than it does to just leave it running all day. That doesn't seem intuitive to me.. is it true?

The problem is that a space heater develops a short circuit when to much current enters the circuit. The power supplied is 1500 W and the max current before short circuit is 15A. Firstly we have to calculate the resistance of the heater where I used P = I^2 R. But now we have to find the...

The problem is designing a solar water heater system to keep a 4500 gal tank of water at 140F during the day. The tank in question has the following properties: 5000gal Volume 4500gal water It loses about 1.8 degrees F/hr if not heated. I first need to figure out amount of energy...

Hi I am living in a 2 bedroom house with base bord heaters but i have also purchesed 3 oil space heaters, my landlord since has givin me a bogus eviction notice because of to much humididiy in the air, his fault really for nothin ensuring propor ventalation when repairing the house but my...

Hi, My friend and I were having a discussion and had a disagreement. I'm hoping one of you intelligent people can settle it for us. There are two points I'd like to talk about. 1. Safety concerns and practicalities aside why would one choose to heat a room with a baseboard heater versus an...

>>>>>>>Home made pool heater.<<<<<<<<< Ok, i know this sound a little stupid. I would like to make a home made hot tub for my mates for this Xmas. I have put together a manifold from 15mm Dia copper tubing and is 8 Meters long. I will be heating this manifold within a beer keg that...

How does a cathode heater work? Can't seem to find a straightforward explanation anywhere.

Hey, I have an idea for a device that I'm trying to fabricate, and I could use some help with the design. Hopefully you can tell me if what I want to do is possible, and what components I'd need. Thanks. My idea is for a device, maybe 6 inches long by four wide that would contain a damp...

A 1500 W heater is connected to 220 V. Calculate a) the current in the heater b) the resistance of the heater c) the termal energy provided by the heater in 1 hour

I have a question on the rankine cycle with a closed feedwater heater. My thermo book says that in an ideal closed feedwater heater, the feedwater is heated to the exit temperature of the extracted steam. I don't really understand this. I know the bleed steam from the turbine is cooled to a...

I work outside, and have absolutely no circulation in my hands. And I like hair-brained schemes. So with these things in mind, I thought I might have a crack at making a little rechargeable pocket heater. Unfortunately, I know very very little about actual electrics. But hey, that's what...

I've heard that solar water heating is very efficient, almost all the radiation of the sun on the panel is turned into heat. Also heard Stirling cycle generators (where heat flow from hot to cold is turned into mechanical motion and hence into electricity) are also quite efficient. Though by...

I've got an electric heater in my appartment. It's on a timer that turns it on at 1200 and off at 2300. While on it's controlled by a thermostat. My question is this; is it more economical for me to leave it on 24/7 instead of what I'm currently doing, the theory being that whatever I save...

I'm trying to figure out how to safely use a dimmer or router speed controller as an inexpensive heat level control for a (nichrome coil) resistance heater. I've read that you can use a dimmer switch as a heat control if you don't run it at more than 80 percent of its watt rating...

For those interested, I have just received my third electricity bill after the installation of my solar hot water heater. Currently, I have realized at total of $158 "saved." Putting that against ~$3500 of total cost, then somewhere between $1200 and $2000 federal tax credit , and the...

Homework Statement It's not a homework problem, but an engineering problem I try to solve before I delve into experimentation :smile: I have a source of heat (SSR - a solid state relay) that's well thermally coupled to the inside of a steel box. The thermal resistance between the SSR and the...

The last time I dealt with any physics was 6 years ago in college, so forgive my apparent ignorance: The Situation. I have a swimming pool pump outside near the house's air conditioner unit (heat exchanger I think it's called). Well, the freon is coming out of the house in copper pipes to...

Help me design my "carputer" to work in the cold (advice on building a heater) Hello. You guys seem to be a knowledgeable bunch, so I thought maybe I'll post thing. My problem is that I custom built a computer to run in my car and I really need some help. I live in Calgary, Canada where in...

I'm new to the site, and to solar power fundamentals. I'm interested in building a small greenhouse with as little impact on the environment as possible. I'd like to develop a solar system to maintain an even temperature. Unfortunately I live in Wisconsin. Any help in design issues would be...

Just curious...how much would it cost you to install a solar water heating system ($/Watt) where u live?

anyone who has a pool heater? or knows how they are installed? if yes...please let me know what is the power rating of the pool heater and what size the pool is..i need it for comparison issues. (power in BTU/Hr, kW, J/s...) thnx Elie

Hi people is my first time posting in this forum... Great Forum¡¡¡ Every Sunday I work selling breakfast food and I got the same problem of all. Food getting cold, so I want to build a heater to maintain the food warn, just to keep it warn for the people be satified of my business...

Here's yet another problem causing me trouble. I just don't understand(yet again) how to begin the problem. A little nudge in the right direction would be very much appreciated! If a heater supplies 1.8 x 10^6 J/h to a room 6.5m X 4.6m X 3.0m containing air at 20 deg C and 1atm, by how much...

"A student uses an immersion heater to heat a cup of water (300mL) from 20ºC to 80ºC for tea. If it is 75% efficient and takes 2.5 min, what is the resistance of the heater? (Assume 120-V household voltage.)" Here's what I did: V= 0.75 * 120 = 90V mass of water = 0.3 kg, specific heat c =...

Hi, I'm a business student working on a business concept, and I need some help with an electrical problem. I am attempting to design a product that stays warm, 50 degrees when the temperature outside is 0 or more. This is insulated, have a volume of around 1200 inches, and is powered by the...

Extracted from another thread tha had got a bit messy. The immersion heater in an electric hot water system is rated at 9 kW. If the tank is initially filled with 40 gallons (about 150 litres, with a mass of 150 kg) of cold water at 15 oC, how long will it take the heater to raise the...

Will turning the water heater on and off save pwoer!>!>?!?

we have heard of fatal electrocution from direct contact with "leaky" water heater. but can one get electrocuted without actually touching the short-circuited water heater parts? i mean, the shower head was on the wall and the person taking shower was sort of busy scrubbing himself. can...

An extension cord made of two wires of diameter 0.129 cm (no. 16 copper wire) and of length 2.7 m is connected to an electric heater which draws 15.0 A on a 120V line. How much power is dissipated in the cord? Do I just use P=IV? But that leaves a lot of "extraneous" information. My...

DIY heater with resistors??! help please Hi physics gurus, I have some questions I'm hoping someone with a kind enough heart can answer for me! I am trying to build a small circular heater (similar to a dew heater for a telescope) with resistors. Basically I have 22 gauge rated 300volts...

What are the advantages of using an immersion heater at the top of a water tank?

A heater has a resistance of 15.0 W. It operates on 120.0 V. What thermal energy is supplied by the heater in 30.0 seconds? Answer must be in Kilo-joules. Well o_o ..it would be nice if you could try to help me with this question. Since I recently moved from Germany to the U.S. with my...

Hi all, I really need somebody to explain to me how to work the following problem... Q: A 1.50E2 - W heater is designed to operate with an EMF of 120V. If the potential difference across the heater changes by a small amount such as 2.6%, approximately by what factor does the power...

I have got a problem here: I was given this: A 125W heater and a thermometer are immersed in 0.6kg of oil in a vessel of negligible heat capacity. The following results were obtained. Temperature (K) 294 302 313 324 334 Time (minutes) 2 4 6...