0
A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into a room per cycle How much work is required in each cycle?
Wiki User
∙ 14y ago
(4 kJ) divided by (efficiency of the refrigerator).
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
Would the mold growth increase or decrease if bread was put in the refrigerator?
Decrease. The refrigerator removes the warmth factor and the damp factor that mold needs to form.
How does a refrigerator cool food and drink?
The fridge removes energy from molecules in foods or drinks which cools them down.
Why is a refrigerator called a thermal energy mover On what scientific principles does it work?
It removes thermal energy on what ever you place on the refrigerator. The first principle is transfer of heat, the second is solidification or vapourization.
What does the filter product 5231ja2006b do?
It is a LG brand refrigerator water filter. It removes more than 90 percent of particulates and chlorine taste from water. Refrigerator water filters should be replaced every 6 months.
What preparations are required with an echocardiography?
The patient removes any clothing and jewelry above the chest.
What is use of calcium chloride salt?
As a desiccant (removes water), deicing road surfaces (decreases the freezing point) and also as a firming agent in food.
All gasoline-powered vessels built after 1940 are required to have either natural or powered ventilation systems What is the purpose of having a ventilation system?
It removes flammable gases
Can a kitchen be cooled by leaving the door of the refrigerator open?
No, although the short-term effect would be for the refrigerator air / freezer air to mix with and cool the air in the room.The function of refrigerator is a heat exchanger; it removes heat from the inside of the fridge and pumps it to the outside of the fridge.If we open the refrigerator door, it will remove the heat from the air that mixes inside, but then will exchange the heat back into the kitchen. That's why the room can't be cooled for a long period. In fact, due to waste heat, the room could become warmer once the refrigerator contents have reached room temperature.
What happens when the door open of refrigerator in a room?
The refrigeration equipment runs constantlty, heating the room. A fridge just removes heat from the inside area and pushes it out the rear coils. Any heat generated by the compressor is added to this.
When the county removes large old oaks for construction aren't they required to replace trees that were removed Who do I contact to talk about this issue?
Your local building and zoning department.
Is it possible to cool down a room on a hot summer day by leaving the refrigerator door open?
Assuming I've interpreted your question correctly, the answer is No: A refrigerator is a heat exchanger; it removes heat from the inside and pumps it to the outside -- to plates on the rear of the fridge. If you feel the back of a refrigerator, it will be warm. You may think that if you separated the plates from the "cooling" part of the fridge and put them outside the room, it would cool the room. And in that case, you'd be correct -- that's how air conditioning works.
Explain the constrution of a refrigerator?
A refrigerator (often called a "fridge" for short) is a cooling appliance comprising a thermally insulated compartment and a mechanism to transfer heat from it to the external environment, cooling the contents to a temperature below ambient. Refrigerators are extensively used to store foods which deteriorate at ambient temperatures; spoilage from bacterial growth and other processes is much slower at low temperatures. A device described as a "refrigerator" maintains a temperature a few degrees above the freezing point of water; a similar device which maintains a temperature below the freezing point of water is called a "freezer". The refrigerator is a relatively modern invention amongst kitchen appliances. It replaced the common icebox which had been placed outside for almost a century and a half prior, and is sometimes still called by the original name "icebox". Freezers keep their contents, usually foods, frozen. They are used both in households and for commercial use. Most freezers operate at around -18 °C (0 °F). Domestic freezers can be included as a compartment in a refrigerator, sharing the same mechanism or with a separate mechanism, or can be standalone units. Domestic freezers are generally upright units, resembling refrigerators, or chests, resembling upright units laid on their backs. Many modern freezers come with an icemaker. Commercial fridge and freezer units, which go by many other names, were in use for almost 40 years prior to the common home models. They used toxic ammonia gas systems, making them unsafe for home use. Practical household refrigerators were introduced in the 1915 and gained wider acceptance in the United States in the 1930s as prices fell and non-toxic, non-flammable synthetic refrigerants such as Freon or R-12 were introduced. It is notable that while 60% of households in the US owned a refrigerator by the 1930s, it was not until 40 years later, in the 1970s, that the refrigerator achieved a similar level of penetration in the United Kingdom Refrigerators work by the use of heat pumps operating in a refrigeration cycle. An industrial refrigerator is simply a refrigerator used in an industrial setting, usually in a restaurant or supermarket. They may consist of either a cooling compartment only (a larger refrigerator) or a freezing compartment only (a freezer) or contain both. The industry has nicknames for these units as well sometimes referring to them as a “cold box” or a “walk-in.” The dual compartment was introduced commercially by General Electric in 1939. The vapor compression cycle is used in most household refrigerators. In this cycle, a circulating refrigerant such as freon enters the compressor as a vapor at its boiling point. The vapor is compressed and exits the compressor as a superheated vapor. The superheated vapor travels through part of the condenser which removes the superheat by cooling the vapor. The vapor travels through the remainder of the condenser and is condensed into a liquid at its boiling point. The saturated liquid refrigerant passes through the expansion valve where its pressure abruptly decreases. The decrease in pressure results in the flash evaporation and auto-refrigeration of a portion of the liquid (typically, less than half of the liquid flashes). The cold and partially vaporized refrigerant travels through the coil or tubes in the evaporator. There a fan circulates room air across the coil or tubes, and the refrigerant is totally vaporized, extracting heat from the air which is then returned to the food compartment. The refrigerant vapor returns to the compressor inlet to complete the thermodynamic cycle. An absorption refrigerator works differently from a compressor refrigerator, using a source of heat, and typically runs more quietly. The Peltier effect uses electricity directly to pump heat; refrigerators using this effect are sometimes used for camping, or where noise is not acceptable. They are totally silent, but less energy-efficient than other methods. Other alternatives to the vapor-compression cycle but not in current use include thermionic, vortex tube, air cycle, magnetic cooling, Stirling cycle, Malone refrigeration, acoustic cooling, pulse tube and water cycle systems.
