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.
Can a COP be less than 1?
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. Most air conditioners have COP of 2.3 to 3.5.
What is the COP of a refrigerator?
The
coefficient of performance
(COP) is a measure of efficiency of the refrigerator. The COP of a domestic refrigerator is the ratio of the refrigeration capacity to the energy supplied to the compressor.
Can refrigeration efficiency be greater than 1?
No, cooling COP is still greater than 1
. Heating COP is a little better because you get to keep the input mechanical energy as heat. COP is NOT efficiency.
What is COP formula?
COP =
|Q| W
. 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.
How is COP of refrigerator calculated?
For such a device we define the coefficient of performance COP as the ratio of the amount of heat removed at the lower temperature to the work put into the system (i.e. the engine). …
COP = Q
low
/(-W) = Q
low
/(Q
high
– Q
low
)
.
What is the meaning of 1 ton of refrigeration?
Ton of Refrigeration (TR): Ton of Refrigeration (abbreviated as TR) is an important historical unit of refrigeration capacity. … American Society of Heating, Refrigerating and Airconditioning Engineers (ASHRAE) defines 1 TR as
equivalent to a refrigeration capacity of 3516.85 W or 3023.95 kcal/h.
Why COP is used instead of efficiency?
the purpose of using heat engine
What is COP value?
COP stands for
Coefficient Of Performance
and indicates the efficiency of heating and cooling machines. … It’s like the efficiency of the machine, but higher than 100%. It could be less than 100% for a machine not working properly.
What is a good chiller COP?
Under standard rating conditions at full load operation, the minimum required coefficient of performance (COP) ranges from 2.40 to 3.06 for air-cooled chillers and
from 3.80 to 6.39 for water-cooled chillers
.
Why COP of AC is more than refrigerator?
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.
Which refrigeration cycle has highest COP?
Carnot cycle
How do you raise the COP on a refrigerator?
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.
What is the COP equation for a home Carnot refrigerator?
At an average temperature of −19°C, the COP for a Carnot refrigerator would be (273 − 19)/(25 − (-19)) = 5.772. Since the
COP = Q
c
/W
, the minimum work can be calculated as W = Q
c
/COP = 1,604/5.772 = 184.3 kJ. Thus, the total work is 685 + 184.3 = 869.3 kJ/kg. For a 4 MTPA LNG unit this is 110 MW.
How the COP of refrigerator is greater than 1?
Why the value of the COP of the refrigeration system is always greater than 1? 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.
