Which Uses More Energy? Radiators Or the Central Heat?

It depends on the fuel, and the system. In Texas, you probably are using some form of energy from fossil fuels. Even if 'cheap', it's not good for our planet. With solar collectors on your roof to help make hot water for the radiators, or to provide heat for the central heat system, you will use way less energy to heat your house. Of course, there is always the possibility that the republicans will try to raise the price of sunlight.

1. Which uses more energy: Heat or AC? (if both are powered by electricity.)?

Heat,. It uses coils that 'heat' up to get warm. AC, pases the gas back through the system, which cools down then the fan blows the air over which cools the air down.

2. heat loss in tea?

conduction: transfer of heat through mug to table or hand convection: transfer of heat to air through tea surface and sides of mug, warm air rises, bringing in cooler air evaporation: water from tea evaporating takes away heat from tea Once you understand how each of those differs, you can figure out which is most effective in cooling the tea. There is lots on the internet about each, google "convection heat loss" or "evaporation heat loss" etc. for more details. (I know, I ignored the second part, but it is *your* homework, not mine. :-) )

3. Heat and temperature question!!!!?

Sadly, Yahoo! Answers has placed another question in the wrong category. Asker could get more responses in the Physics forum.

4. How do you get a feel for the heat (direct heat)?

I am with KatieK. That said, this 'how hot' can be mysterious for Professionals as well. In "Seven Fires, the Argentine way of Grilling," a book about cooking on open flame heat (outside mostly), the author mentions traveling around to a bunch of Argentine steak places to time and measure what the chefs did mostly by touch and feel.So, even for a pro, getting it just right takes a lot of time and experience. If you are persnickety, maybe you should get an infra-red thermometer

5. The Band or Canned Heat?

been listening to both lately. leaning towards canned heat. no favorites.

6. i've rented a house since july, i still do not have heat, and my landlord hardly fixes anything. what can i do

The "legal standard" for heat is that a heat source has to be provided. Any heat source counts, fireplace, electrical heater, etc. The landlord does NOT have to provide fuel. You need to contract with your power company if you have a gas furnace. Toilets do not break on their own and have a life expectancy of 100 or so years, so its repairs are maintenance that falls on the renter for the most part.

7. I am trying to figure out in winter is it better to shut 2nd floor vents & heat flow thru 1st or vice versa?

if you have to choose heat the first floor because heat rises

8. Formula for the heat input in a heat engine

Given that body $B$ is taken from $T_B$ to $T_A$, only $A$ may be considered as heat reservoir. This can happen in reality if $C_Agg C_B$. The expression $Q_B=C_B(T_B-T_A)$ just follows from the definition of $C_B$.

9. how much heat is required to heat 24.2 grams of ethanol?

Temp will rise steadily from -200C to -114C when the solid ethanol melts. The line will be horizontal until all the ethanol liquefies. The temp will then rise steadily again to 78C when the ethanol boils. The line will be horizontal until it all vaporises. Then it will rise steadily to 100C. The rate at which this happens will depend on how much heat is applied, which is not given.

10. How do you heat a house with very high ceilings??

Since heat rises, ceiling fans will help push the warm air down

11. What is the best way to make a component to help disperse heat from a heat gun?

Just to add some context to the question.I am a tertiary student and I'm doing final year project working on "Aircraft cabin air leakage detection without pressurization of the aircraft".One way we are experimenting on to detect air leakage is to use heat gun to heat up the window edges to create pressure differential. We assume this will result in heated air getting penetrated into the aircraft if there is a leakage. To see this penetration, we use thermographic camera inside the aircraft in front of the window we are using the heat gun. The leakage areas will have higher temperature shown through the thermal camera.So, the problem I am facing right now is not being able to disperse heat on the surface of the aircraft effectively using the heat gun. I am planning on making a modular part that can be attached to the heat gun output, so the air is evenly spread on the surface. The reason is currently one person have to move the heat gun around the area by hand and it's better if there is a better method where we can just set the heat gun in one place. This way one person can carry out the whole inspection after setting the heat gun outside and then going inside the aircraft to make the observation through a thermal camera. Is there any method I can achieve this without having to move the heat gun around the surface manually? I would like to have some ideas for a design that I can build to attach on the nozzle. There is no issue for me to get it fabricated. So, complexity is not a problem.Currently tested aircraft window is shown above. The leak is on the right bottom of the shown emergency exit window.The current heat gun we are using.Output of the heat gun.What is the best way to make a component to help disperse heat from a heat gun?

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