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Q: How many btus are requiier to change five pounds of ice 20f to steam at 220f?
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How do heating and air conditioning work?

An AC system is a refrigeration system just like your refrigerator, it operates by changing the physical state of a refrigerant via evaporation to remove heat and condensing to reject the heat removed out doors. Upon a call for cooling from the thermostat, a 24 volt signal is sent to the AC unit outside where it energizes a electromagnetic relay called a contactor, it pulls the normally open switch closed just as an electromagnet picks up scrap metal in a scrap yard, The electrical current creates a powerful magnetic field that sucks the normally open switch closed, this sends 230 volts to the compressor which begins to run. A cool ,low pressure vapor is pulled into the compressor from the evaporator coil, it will be approximately 70 psi and 40F degrees, if using R 22 refrigerant. As it may be 100F or more outdoors, the compressor must bump up the cool low pressure vapor up to a hot high pressure vapor, it will pump it up to about 30F degrees above the outdoor ambient temperature, this is so that regardless of how hot it may get out side, the refrigerant is hotter, thus able to reject heat to the relatively cooler out door air, thus condensing the vapor refrigerant into a liquid refrigerant that is still hot but a high pressure liquid. The hot high pressure liquid is sub cooled to about 15F degrees below the condensing temperature That will be about 125 F @ 270 psi, again if using R 22 refrigerant. The hot high pressure liquid refrigerant is then sent to the metering device, this is what delineates the hot high pressure side from the cold low pressure side. Imagine you have a mouth full of water and a straw in your mouth, if you blew hard the water will spray out the end of the straw and upon exiting the straw the liquid refrigerant "boils" changes state liquid to vapor just as boiling a pot of water boils or changes state if raised above 220F at sea level 14.7 psi atmospheric pressure. The clod low pressure vapor exits the evaporator coil and is sucked into the compressor for the next trip around and around evaporating and condensing the refrigerant to remove heat and to then reject heat.


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The temperature of the steam in a steam engine will vary as the pressure of the steam. The higher the pressure, the higher the temperature that the steam headers (pipes) will run at. Because pressure varies between steam engines, temperature will vary also. Those temperatures could be from between 300 to 400 degrees on up to 700 to 800 degrees Fahrenheit, depending on the actual pressure the boiler is running at.Toy - Model steam engines typically use much lower steam pressures, and these machines run at 220F to about 250F


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How hot can a engiene get?

typically most automobile gasoline engines operate between 190F-210F 220F and up is usually when a motor is beginning to overheat


How hot does the car engine get if you rev it?

Reving it up doesn't really change the temperature if the cooling system is working properly. Depending on the Yr/make/model. Newer cars have higher pressure radiator caps= higher operating temperatures. Mid 90's cars had mainly 180f thermostats with operating temps. up to/around 220f. Newer cars run 220-260*f.


Is 219F to hot for a 98 caddy to run?

No. I wondered that myself. Northstar engines do run a bit warmer than many other engines. I went to the dealer to have a water pump changed and asked the same question. I was told that 212F to 220F is quite normal for this engine.


How many btus are required to change one pound of ice at 20 degrees Fahrenheit to steam at 220 degrees Fahrenheit?

1)This is a 5 part question. The first is realizing that 20F to 32F uses .5BTU per pound per degree. That means it takes 32-20=12*.5=6BTUs to get the ice to 32F. 2)Then you need to know the Latent Heat of Fusion for Ice which is 144BTUs (given). Lets assumes the ice changes from ice to water instantaneously at 32F. 3)Next we calculate the BTUs from 32F to 212F. Which is 1BTU per pound per degree F. 212-32=180 so it take 180BTUS. 4)Next we have to use the Latent Heat of Vaporization of water which will say instantaneously converts water to vapor. This takes 970BTUS (given). 5)Then we calculate the BTUS from 212F to 220F. Which is .5BTUs per pound per degree F which is 220-212=8*.5=4BTUs...... Finally add up all the BTUs and you get 6+144+180+970+4=1304BTUs.


When baking is 220 degrees Euro same as 220 degrees in the United states?

There is no such thing as 220 degrees Euro. In Europe temperature is measured in Centigrade (Celsius)(C) In the USA it is still measure in the old Fahrenheit (F)system 220 C = 430F Whereas 220F = 105C (Definitely not hot enough to bake anything)


What is the normal operating temperature of a 2007 gsxr-600?

My 07 gsxr 600 runs anywhere from 180-220 (when the fan kicks on). Just depends on the situation, riding down the road at 60 should stay around low 180's. Sitting in traffic on a hot day it gets hot. If the fan does not kick on at 220F then you need to get it looked at.


What is the normal oil teperature range for a 1988 corvette?

depends on your thermostat full-flow rating and engine, but most high performance engines operate at their peak at about 205f-220f but keep inmind these engines are short and fast runners with lots of preventive maintenance not like the every day driver that will run at 180f-200f, so it all depends on your motor and what its used for.