COP stands for Coefficient Of Performance and indicates the efficiency of heating and cooling machines. The COP is defined by the ratio heat dissipation and electrical power intake. It’s like the efficiency of the machine, but higher than 100%. It could be less than 100% for a machine not working properly.

The COP usually exceeds 1, especially in heat pumps, because, instead of just converting work to heat (which, if 100% efficient, would be a COP of 1), it pumps additional heat from a heat source to where the heat is required.

For a refrigerator the coefficient of performance is COP = Qlow/(-W). Details of the calculation: (a) COP = Qlow/(-W). (-W) = Qlow/COP = 120/5 J = 24 J.

it is because the temperature we want in AC is about 17 degree celsius which is more than the required temperature in refrigerator (0 degree celcius). therefore , therefore, cop of AC is greater than cop of refrigeration.

The coefficient of performance (COP) of refrigeration is always more than 1. Hence option (a) is correct. COP is the ratio of heat extracted from the refrigerator to the work done on the refrigerant. Thus it is but obvious that the value of COP is bound to be greater than unity since efficiency is always less than 1.

However, you cannot cool the kitchen by having the refrigerator door open. The refrigerator exhausts more heat than it removes from the refrigerated volume, so the room actually gets warmer with the refrigerator door open.

The temperature of room will increase. If a refrigerator door is open then more flow rate of coolant is required in order to maintain lower temperature So the compressor will be running continuously also heat exchange happening through condenser increases the room temperature rather than decreasing.

The reason is that with the door open the temperature will start to rise inside the refrigerator. The thermostat will kick in and try to cool it back down. This means the motor is running, which means heat is being added to the room. Keep the door shut.

When the door of a running refrigerator inside a room is left open, T2→T1. Therefore, heat energy given to the room increases. Hence the room will be warmed up gradually.

Close the Refrigerator Door “If left open too long, it can make the compressor — which cools the refrigerator — overheat and shut off until it cools off,” Falone says. “Or it can actually cause it to fail completely.”

The average time you can leave a fridge open without food spoilage is 60 – 240 minutes.

No, the room can’t be cooled by leaving the door of an electric refrigerator open. In fact the temperature of the room rises because the refrigerator extracts heat from the freezing chambers and rejects it to the surrounding air in the room.

Since there is energy going into the room, it is open system without mass transfer. The room temperature will increase. The temperature of the room will increase. A referigerator essentially draws warm air from inside the fridge and dumps it outside.

Heat engines often operate at around 30% to 50% efficiency, due to practical limitations. It is impossible for heat engines to achieve 100% thermal efficiency () according to the Second law of thermodynamics.

If a refrigerator’s door is kept open, then room will become hot, because then refrigerator exhaust more heat into the room than earlier. Thus it exhaust more heat into the room than it extract from it. Thus, a room cannot be cooled by keeping the door of a refrigerator open.

If you leave the door open, heat is merely recycled from the room into the refrigerator, then back into the room. A net room temperature increase would result from the heat of the motor that would be constantly running to move energy around in a circle.

When a refrigerator is horizontal, the oil from the compressor will start to move out and into the coolant lines, clogging them. Besides this, placing a refrigerator flat on its back is a major no-no: the weight of the fridge can damage its internal parts, even if they’re not exposed.

You can fan yourself with the door to cool yourself down, but you can’t actually lower the temperature of the room. This is because refrigeration is not a perfectly efficient process. More heat enters the room through the exhaust vent than is extracted from the inside of the refrigerator.

Refrigerators generate heat during the process of making cold air. In order to cool this heat down, heat dissipation pipes are installed on both outer walls of the refrigerator, so when the product is operated, heat is generated on the side walls of the refrigerator.

A fridge in a cold room will have an easier time cooling down, in will therefor be on a shorter amount of time. So it will be more efficient. In a cold room, of course. Just take it to the extreme: If the room temperature is at 36F, the fridge won’t use any energy at all (approximately).

Yes. To make the inside of the unit and the articles inside cold the cooling process must transfer the heat from the inside to the outside, that will add heat to the room. The mechanism for doing this is a cooling system driven by an electric motor (compressor). This also adds a certain amount of heat.

Do not put the refrigerators on carpets. Carpets hold the heat and cause the compressor to work for longer periods of time and in higher temperatures. If the compressor works in that way, it uses more energy and can quickly break down. It won’t be visible and the refrigerator will work more fluently.

All electrical appliances create some risk of an electrical fire, and mini fridges caught on fire before. Prevent your fridge from overheating by making sure there is plenty of air circulating around the coils and vents.

Refrigerators (fridges) are safe to have in the bedroom if you have no other place to store it. Dorm room mini-refrigerators are also safe to keep in the bedroom, as long as they’re kept on a hard surface.

Carbon monoxide is a deadly gas that can be generated in your own home without your knowledge. Appliances such as space heaters, gas stoves, furnaces, heaters, and refrigerators can all emit CO if poorly ventilated. A gas leak can also be a major cause of carbon monoxide emission.

Do not put the fridge on the carpet directly. You could place a solid wooden board, a plastic chair mat like this, or a movable adjustable base or a piece of linoleum or vinyl flooring between the carpet and the fridge. This will ensure that there is good air circulation and to keep water off the carpet.

Staying Put An interlocking track system installed under the fridge protects the floor from dents even while the appliance stands in place. Other options include rubber or plastic cup-style floor protectors that act as shoes for the feet of heavy furniture or appliances.

Putting a refrigerator on a floating floor is a little risky but not impossible. As much as possible, ensure that the floor does not come in direct contact with the walls or cabinets in the kitchen so that it has plenty of room to shift in any direction without creating problematic lumps.

Moving a refrigerator is troublesome in any situation, but if you have vinyl floors, the weight of a refrigerator can place tremendous strain on the fibers, tearing at the material and potentially causing permanent damage to the floor. Place sheets of 1/4-inch plywood or underlayment along the vinyl floor.

Refrigerators usually only roll one way forward and backward, but not side to side. Sliding the refrigerator sideways on laminate flooring can mar the floor. Before rolling it on to the laminate you will need to protect the edge of the installed laminate so it doesn’t get chipped.