refrigerators are products of?
405022
needing porkchops to stay fresher, longer.
201844
Hopefully this will help some.  The first artificial refrigeration device was introduced at the University of Glascow in 1748, but it seems refrigerators and freezers didn't become common until the late-1800's to the early 1900's.  So although it's not probable that someone in the desert of Arizona was able to store and even make ice in 1910, it's definitely possible.
91397
It gets heated.  In a refrigerator, the refrigerant fluid circulates in a loop from compressor to outside heat exchanger (to release heat) to the inside exchanger (to absorb heat).  Compression increases the fluid's heat, and the outside heat exchanger then transfers to the surrounding air that added heat and additional heat that is released when the gaseous part of the refrigerant condenses.  The latter is called the heat of vaporization, and is a specific property of any vaporizable material.  That same heat of vaporization is absorbed in the inside exchanger as the fluid evaporates.  This absorption cools the refrigerator.  An interesting if small improvement was made on the basic system; the addition of a length of side-by-side welded refrigerant tubing called the siamese.  The still somewhat warm fluid from the outside exchanger flows adjacent to, but in the opposite direction to, the still pretty cold fluid from the inside exchanger.  This "counterflow" exchange helps chill the fluid entering the inside exchanger.  Although warmed up some, the fluid flowing from the inside exchanger is going to get heated up a lot by the compressor anyway, so this ploy increases efficiency.
501058
Not as much as they used to. Refrigerators work by using a liquid in a closed system. The liquid expands by taking heat from the inside and rising. By rising, a fluid current is created that keeps things running along. At the bottom of the system, a fan blows to cool the fluid back down and keeps the circulation going. If you lay it on a side, the circulation stops, and bubbles may form, which will make it difficult to start it up again. These systems are a lot tighter than they used to be and bubbles are not as likely to form.
101795
Oil\nwood\nleaves\nmethane\njust about any vegetation\nfat (like whale oil or blubber)\nnatural gas\ncoal\ntar\npeat (actually a form of coal)\nalcohol (from fermented vegetation or nectar)\netc
125270
A gas refrigerator uses ammonia as the coolant, and it uses water, ammonia and hydrogen gas to create a continuous cycle for the ammonia. The refrigerator has five main parts: \n\nGenerator - generates ammonia gas \nSeparator - separates ammonia gas from water \nCondenser - where hot ammonia gas is cooled and condensed to create liquid ammonia \nEvaporator - where liquid ammonia evaporates to create cold temperatures inside the refrigerator \nAbsorber - absorbs the ammonia gas in water \n\nThe cycle works like this: \n1. Heat is applied to the generator. The heat comes from burning something like gas, propane or kerosene. \n2.  In the generator is a solution of ammonia and water. The heat raises the temperature of the solution to the boiling point of the ammonia. \n3.  The boiling solution flows to the separator. In the separator, the water separates from the ammonia gas. \n4.  The ammonia gas flows upward to the condenser. The condenser is composed of metal coils and fins that allow the ammonia gas to dissipate its heat and condense into a liquid. \n5.  The liquid ammonia makes its way to the evaporator, where it mixes with hydrogen gas and evaporates, producing cold temperatures inside the refrigerator. \n6.  The ammonia and hydrogen gases flow to the absorber. Here, the water that has collected in the separator is mixed with the ammonia and hydrogen gases. \n7.  The ammonia forms a solution with the water and releases the hydrogen gas, which flows back to the evaporator. The ammonia-and-water solution flows toward the generator to repeat the cycle.
1033992
Initially it will to remove the heat from everything.  After that it will use less energy.  Those Items inside that are already cold will help the refrigerator maintain its cold state.
159207
What kind of products or services?
822886
Domestic and commercial refrigerators may be rated in kJ/s, or Btu/h of cooling. Commercial refrigerators are mostly rated in tons of refrigeration. One ton of refrigeration capacity can freeze one short ton of water at 0 °C (32 °F) in 24 hours. Based on that:\n\nLatent heat of ice (i.e., heat of fusion) ≈ 144 Btu / lb (or 334.5 kJ/kg) \nOne short ton = 2000 lb \nHeat to be extracted = 2000 * 144 = 288000 Btu / 24 hours = 12000 Btu/hour = 200 Btu / Minute \n1 ton refrigeration = 200 Btu / minute = 3.517 kJ/s = 3.517 kilowatts[8] \nA much less common definition is: 1 tonne of refrigeration is the rate of heat removal required to freeze a metric ton (i.e., 1000 kg) of water at 0 °C in 24 hours. Based on the heat of fusion being 334.5 kJ/kg, 1 tonne of refrigeration = 13,938 kJ/h = 3.872 kW. As can be seen, 1 tonne of refrigeration is 10% larger than 1 ton of refrigeration.\n\nMost residential air conditioning units range in capacity from about 1 to 5 tons of refrigeration.
1104610
Ammonia is shipped as a liquified gas under its own vapor pressure of 114 psig. The oldest commercial refrigerant known and still in use today. Most extensive use is in soil fertilization. This application is used in the form of salts, nitrates and urea.\n\nIt is the simplest stable compound of these elements and serves as a starting material for the production of many commercially important nitrogen compounds. Pure ammonia was first pre-pared by Joseph Priestley in 1774, and its exact composition was determined by Claude-Louis Berthollet in 1785.
1157809
The landlord is responsible for the appliances in the apartment.  If you buy the fridge, you can deduct it from your rent.\np.s.  You can also deduct the cost of the food that spoiled..I did it.
377342
compressor: compresses things\nevaporator: evaporates things\ncondensor: condenses things\nmetering device: meters things\n\ngood luck
648194
The basic principle of how these refrigerators cool their interior is the same as in conventional compression refrigerators. Both use refrigerant liquids that boil at low temperatures to achieve cooling. A large amount of energy is needed to turn the liquid into gas, and this is absorbed from the surroundings, cooling them. The difference is in how the gas is turned back to liquid to use it again for more cooling. A conventional electric refrigerator uses a pump to compress the gas back to liquid; a gas absorption refrigerator uses another liquid to absorb the gas and then has extra stages to separate the pure refrigerant liquid out again for re-use, this extra part being where the heat source is involved.\n\nVariations exist, but the usual pattern of gas absorption refrigerator uses ammonia as the refrigerant and water as the absorber, with hydrogen gas included to adjust the pressure in the system. The exact mixture and pressure has to be correct to give proper cooling at normal temperatures.
683116
The absorption refrigerator is a refrigerator that utilizes a heat source to provide the energy needed to drive the cooling system rather than being dependent on electricity to run a compressor. These refrigerators are popular where electricity is unreliable, costly, or unavailable.\n\nThe basic principle of how these refrigerators cool their interior is the same as in conventional compression refrigerators. Both use refrigerant liquids that boil at low temperatures to achieve cooling. A large amount of energy is needed to turn the liquid into gas, and this is absorbed from the surroundings, cooling them. The difference is in how the gas is turned back to liquid to use it again for more cooling. A conventional electric refrigerator uses a pump to compress the gas back to liquid; a gas absorption refrigerator uses another liquid to absorb the gas and then has extra stages to separate the pure refrigerant liquid out again for re-use, this extra part being where the heat source is involved.\n\nVariations exist, but the usual pattern of gas absorption refrigerator uses ammonia as the refrigerant and water as the absorber, with hydrogen gas included to adjust the pressure in the system. The exact mixture and pressure has to be correct to give proper cooling at normal temperatures.\n\nThe cooling system consists of four main parts: the evaporator, absorber, generator and condenser. The evaporator is where chilling happens as the liquid ammonia evaporates, absorbing heat from its surroundings to enable the liquid to turn to gas. The ammonia gas passes on to the absorber, where it dissolves in water. The solution flows down to the generator where the external heat source is used to bubble the ammonia out again. This gas is purified by condensing out water vapour before rising to the main condenser. The condenser has big fins on the outside which let air cool it sufficiently for the ammonia to flow out of the bottom as a liquid again, down into the evaporator.\n\nThe hydrogen plays an interesting part in making this cycle work. Why does the ammonia which turned to liquid in the condenser then evaporate at essentially the same temperature and pressure in the evaporator? Because the evaporator also contains hydrogen gas, and the partial pressures exerted by the two gases mean that the ammonia liquid will evaporate (Dalton's law applies). The hydrogen is present in the absorber too, but is not absorbed as it does not dissolve in the water.\n\nThe ammonia, water and hydrogen system is closed. The water in the absorber is actually a weak solution of ammonia carried out of the generator when the ammonia bubbles out by a "bubble pump" like the pipe of a coffee percolator. There is no other pump in the system, liquids flowing back down under gravity and the gas pressure being the same throughout the system.\n\nThere are other gas absorption refrigerators which use only ammonia and water with a heat source applied intermittently, possibly just once a day. These have a pressure valve between the condenser and evaporator so that the generator and condenser are pressurised when the generator is heated. The liquid ammonia is forced slowly through the valve from the high pressure side into the evaporator where it evaporates in the lower pressure. The pressure differential will last for some time after the heat source is removed, so active cooling occurs for longer than the time the heat is applied. When the pressures have equalised, the ammonia solution from the absorber can flow back into the generator ready for the cycle to start again.
468525
The refrigerator works in the principle of Carnot’s cycle.\n\n The heat energy from the refrigerator (closed) is removed and is given out to the surrounding air.  \n\nThat is to say, by heating the external air the air inside the refrigerator is cooled.\n\nHence if the door is opened the cooling effect by the fridge is nullified by its heating effect.\n\nBut technically speaking, if you fit a refrigerator in the wall of a room so that the hot side is out side the room and the room is closed then depending upon the power of the refrigerator the room will be cooled with time.\n\nBut this is the principle used by air conditioning machine. Therefore one will prefer air conditioning rather than fitting a refrigerator.\n\nIn terms of thermodynamics, It is impossible to derive continuous supply of energy by cooling a body below the coldest of its surrounding.
948756
television(CRT), hairdryer(any electric motor), latches to keep cabinet doors shut, fluorescent lights(the ballasts have a step-up transformer), speakers, refrigerator door seal,
936508
Neither. Let's have a given that 1 fridge is empty and at 40 degrees inside. The other fridge is full and at 40 degrees. The room that these 2 fridges are in is at 70 degrees. The difference in temperature is the cause for heat to flow from hot to cold. The fridges have insulation that has a certain resistance to heat flow. The heat will flow through the walls of the fridges the same, so then Q(heat flow)=A(area)x(T1(70 degrees)-T2(40 degrees))/R(resistance). The area of heat loss for both fridges are equal,the resistance of both fridges are equal, the temperature differential for both is equal,  so the amount of electricity needed to keep the fridges at 40 degrees is equal.