To improve the coefficient of performance, its requires that the compressor work should decrease and refrigeration effect should increase It means that decrease in condenser pressure and temperature so the refrigeration effect will increase and compressor input work due to this cop will increase
Which factor increases the COP of refrigeration cycle?
Based on the current designs of the refrigeration cycles, the coefficient of performance (COP) of the cycle increases with the increase in the power consumption (as multiple compression stages required) and adding additional elements such as compressors and turbo-expanders
Which one is the effective way to increase the COP of a Carnot refrigerator?
Is it possible to increase the COP of a Carnot refrigerator? A Carnot refrigerator is a heat pump that operates on the reversed Carnot cycle The COP of a Carnot refrigerator can be increased by either decreasing or increasing the value
How can we improve COP why can’t we call it as efficiency of refrigerator than COP?
the purpose of using refrigeration cycles is to transport heat from a low temperature place to a hot temperature place in order to keep the cold place at low temperature by applying work so the efficiency in this case is the heat removed from the cold place per unit of work applied (which is called COP)
Does flash chamber increases COP?
So, to avoid vapor to enter the evaporator, a flash chamber is used Flash chamber reduces the size of the evaporator and theoretically, it does not have any effect on COP and the system, but practically as the losses during the flow reduce COP increases, therefore, there is an increase in refrigeration effect
How do you improve the COP?
To improve the coefficient of performance, its requires that the compressor work should decrease and refrigeration effect should increase It means that decrease in condenser pressure and temperature so the refrigeration effect will increase and compressor input work due to this cop will increase
How can the refrigeration effect be improved?
To improve the coefficient of performance, it is to require that compressor work should decrease and refrigerating effect should increase Modifications in condenser are meant to increase degree of sub-cooling of refrigerant which increased refrigerating effect or more cooling water is required in condenser
When the higher temperature is fixed COP of a refrigerating machine can be improved by?
When the lower temperature is fixed, COP of a refrigerating machine can be improved by operating the machine at higher speeds operating the machine at lower speeds raising the higher temperature
How does the increase in condenser temperature affect COP?
The figure indicates that as the condenser temperature increases, the COP decreases for both refrigerants This is so since the refrigeration capacity decreases and the compressor power increases with an increase in the condensing temperature
What is COP in refrigeration system?
The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work (energy) required Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs
What is a good COP for a refrigerator?
For a refrigerator keeping an inside temperature of 4 oC = 277 K operating in a room at 22 oC = 299 K the best possible coefficient of performance is COPmax = 277/(299 – 277) = 126 The best possible ratio of the amount of heat removed to the work done is 126
What is the COP formula?
COP (Coefficient of Performance) COP is defined as the relationship between the power (kW) that is drawn out of the heat pump as cooling or heat, and the power (kW) that is supplied to the compressor For example: A given heat pump used for air cooling has a COP = 2
Can the COP of a refrigerator be less than 1?
In the case of vapour absorption system, the input is invariably “heat”, which is a low grade energy, its conversion into other forms is not efficient and the COP is less than 1 So, the answer to your query is that, yes, the COP can be less than 1
How a multistage compression system reduces the work input to the compressor?
Multi-stage compressors feature two or more piston cylinders, each of a different diameter After the first compression stage, air passes through a heat exchanger, where it is cooled before arriving at the second cylinder Cooling the air reduces the work needed to compress it during the second or third stages
What is the effect of an increase in discharge pressure on cop?
What is the effect of an increase in discharge pressure on COP? Explanation: As COP is the ratio of refrigeration effect to work done Due to the increase in the discharge pressure, the refrigeration effect decreases for the same amount of refrigerant flow
What is the value of COP in Vapour compression cycle?
For vapour compression cycles the COP will be always greater than unity Because the value of COP being less than one means that the efficiency of the system will be greater than one
What removes moisture from a refrigerant?
Detailed Solution Drier is used to remove the moisture from the refrigerant Sometimes it is also referred as dehydrator or dryer
How can we improve the performance of a refrigeration system that operates over a wide temperature range?
One means of improving the performance of a refrigeration system that operates over a wide temperature range is to use a two-stage compressor
What is cooling effect of refrigerator?
So how does refrigeration work? In general, refrigerators are cooled through the evaporation of a volatile liquid—that is, they use a liquid that evaporates very easily, and this evaporation creates the cooling effect They then compress the gas into a liquid again, and the whole process starts over
What happens to the COP of a Carnot refrigerator in summer and in winter?
What happens to the COP of a Carnot refrigerator in summer and in winter? Explanation: As the higher temperature T2 will always be lower in winter when compared with that of summer ie the temperature of air available of heat rejection will be low, the COP in winter will be higher COPp=789+1=889
Why low temperature refrigeration is produced in an air standard refrigeration system?
Why low temperature refrigeration is produced in an air standard refrigeration system? Explanation: Due to expansion of air in turbines, the pressure in the air decreases and the loss of pressure results in the fall of temperature Hence low temperature is obtained in air standard refrigeration system
Which one of the following refrigerant has the highest critical temperature?
∴ Ammonia has the highest critical point pressure
Does superheating increase the COP of refrigeration cycle How?
In a refrigeration system, the superheating decreases COP increase refrigerating effect but increasing amount of work done
Does subcooling increase COP?
It is shown that, as condenser subcooling increases, the COP reaches a maximum as a result of a trade-off between increasing refrigerating effect and specific compression work Refrigerants with large latent heat of vaporization tend to benefit less from condenser subcooling
How do cops Increase heat pump?
As can be seen, the COP of a heat pump system can be improved by reducing the temperature difference (Thot – Tcold) Therefore, reducing the output temperature (Thot) is very efficient, but requires very efficient heat transfer from heat pump system to surroundings (ie use of piped floor)