h2s, which can be determined, is found. For state 2s,
s2 = s1 = 0.9354 kJ/kg*K
. Using this information with Table A-12, it is found that state 2s is outside of the vapor dome and into the superheated region i.e. s2 >
[email protected]
=700kPa.
How do you calculate the efficiency of a refrigeration cycle?
Where can I find a cop for a refrigerator?
For a refrigerator the coefficient of performance is
COP = Q
low
/(-W)
. Details of the calculation: (a) COP = Q
low
/(-W). (-W) = Q
low
/COP = 120/5 J = 24 J.
What is QL in refrigeration system?
(4) QL is
the heat removed from the space to be refrigerated
. The performance of a refrigerator is given in terms of the coefficient of performance, COP, denoted by COPR, COPR = QL.
What is COP formula?
COP (Coefficient of Performance)
The Co-efficient of performance (COP) is an expression of the efficiency of a heat pump. When calculating the COP for a heat pump, the heat output from the condenser (Q) is compared to the power supplied to the compressor (W).
COP =
|Q| W
.
How do you calculate refrigeration capacity?
What is the efficiency formula?
Efficiency is often measured as the ratio of useful output to total input, which can be expressed with the mathematical formula
r=P/C
, where P is the amount of useful output (“product”) produced per the amount C (“cost”) of resources consumed.
How is refrigerator compressor power calculated?
Refrigerator Power Consumption Formula:
E
( kWh )
= V
( V )
x I
( A )
x Hr / 1000
. Here Refrigerator wattage is equal to the product of input voltage and current. V
( V )
is the input voltage of the refrigerator, I
( A )
is the input current in Amps.
What is the coefficient of performance of a refrigeration cycle?
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.
How do you find the coefficient of performance for a refrigerator?
The coefficient of performance, COP, of a refrigerator is defined as
the heat removed from the cold reservoir Q
cold
(i.e., inside a refrigerator) divided by the work W done to remove the heat
(i.e., the work done by the compressor). The COP strongly depends on outside temperature and required indoor temperature.
How is police AC calculated?
If an air conditioner has a rating of 2.5kw, giving you 2.5kw of cooling, it is only using 0.52kw to achieve that. Then the COP of that air conditioner would be
2.5 divided by 0.525
= 4.7, essentially almost 5 times more efficient than electrical heating.
What do you mean by 1 ton of refrigeration?
A refrigeration ton is approximately equivalent to
12,000 BTU/h or 3.5 kW
. Air-conditioning and refrigeration equipment capacity in the U.S. is often specified in “tons” (of refrigeration). Many manufacturers also specify capacity in BTU/h, especially when specifying the performance of smaller equipment.
What is the chemical formula for refrigerant R22?
| Names | Chemical formula CHClF 2 | Molar mass 86.47 g/mol | Appearance Colorless gas | Odor Sweetish |
|---|
What is COP of Carnot cycle?
The COP of a Carnot refrigeration cycle is
a function only of the upper and lower temperatures of the cycle
, and it is true that the reversed Carnot cycle is the most efficient refrigeration cycle operating between these two specified temperature levels.
What is TH and TL in Carnot cycle?
A heat engine with Carnot cycle, also called Carnot heat engine, can be simplified by the following model: A reversible heat engine absorbs heat QH from the
high-temperature reservoir at TH und releases heat QL to the low-temperature reservoir at TL
. The temperatures TH and TL remain unchanged.
What is COP and EER?
COP is a measurement of the energy efficiency of your air-conditioning unit’s heating performance. EER is the ratio of a unit’s cooling output relative to its input power
.
How is chiller police calculated?
Take for example a chiller which is producing 2,500kW of cooling or 8,533,364BTU/h in metric units. The electrical power demand of the chiller to produce this is 460kW. The metric calculation would be:
2,500kW / 460kW = 5.4
so the COP is 5.4.
What is open air refrigeration cycle?
Open air refrigeration cycle
In an open refrigeration system,
the air is directly passed over the space is to be cooled, and allowed to circulate through the cooler
. The pressure of open refrigeration cycle is limited to the atmospheric pressure.
How many BTU is 160 square feet?
| Heating Capacity Square Footage(Hot Climate) Square Footage(Cold Climate) | 4,000 BTU 130 sq ft 70 sq ft | 5,000 BTU 160 sq ft 90 sq ft | 6,000 BTU 200 sq ft 105 sq ft | 9,000 BTU 300 sq ft 160 sq ft |
|---|
How do you calculate energy input?
What is energy formula?
The energy stored in an object due to its position and height is known as potential energy and is given by the formula:
P.E. = mgh
. Unit. The SI unit of energy is Joules (J).
How do we calculate energy?
In classical mechanics, kinetic energy (KE) is equal to
half of an object’s mass (1/2*m) multiplied by the velocity squared
. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s
2
.
How is energy calculated in a compressor?
- Compressibility factor (Z) = 0.9972.
- Molecular weight (MW) = 18.15.
- Gas constant (R) = 1544/molecular weight.
- Inlet temperature (T1) = 546 deg R.
- Inlet pressure (P1) = 15 psia (don’t forget to use absolute pressure)
- Outlet pressure (P2) = 60 psia.
- K (Cp/Cv) = 1,274.
What is the kW of a refrigerator?
Domestic fridge power consumption is typically
between 100 and 250 watts
. Over a full day, a fridge records between 1 to 2 kilowatt-hours (kWh) of total energy usage, or about $150 per year per fridge. These figures can be validated for your refrigerator by using a plug-in power meter like this.
