How Do You Calculate Mass Flow Rate Of Refrigerant?

1. Refrigerant mass flow rate (kg/s) (9.6) r = Q e / h 1 − h 4.
2. Compressor isentropic power (kW) (9.8) r h 2 − h 1.
3. Heat rejected in condenser (kW) (9.9) h 2 − h 3.

How do you calculate rate of refrigeration?

Calculate the cooling rate by dividing each temperature data point by its corresponding time data point then average all of your answers to achieve a cooling rate. In other words, the change in the temperature divided by the change in time will give you an average temperature rate change.

How do you calculate mass flow rate?

Mass flow rate can be calculated by multiplying the volume flow rate by the mass density of the fluid, ρ . The volume flow rate is calculated by multiplying the flow velocity of the mass elements, v, by the cross-sectional vector area, A.

How do you calculate mass flow on a compressor?

1. Refrigerant mass flow rate (kg/s) (9.6) r = Q e / h 1 − h 4.
2. Compressor isentropic power (kW) (9.8) r h 2 − h 1.
3. Heat rejected in condenser (kW) (9.9) h 2 − h 3.

What is refrigerant mass flow rate?

Saturated vapor enters the compressor. at − 10°C and saturated liquid leaves the condenser at 9 bar. The mass flow rate of the. refrigerant is 0.08 kg/s .

What is the difference between mass flow rate and volume flow rate?

What is the difference between mass flow rate and volume flow rate? Volume flow rate is the amount of volume flowing through a cross-section. Mass flow rate is the amount of mass passing through a given cross-section.

How do I calculate flow rate?

Flow rate is the volume of fluid per unit time flowing past a point through the area A. Here the shaded cylinder of fluid flows past point P in a uniform pipe in time t. The volume of the cylinder is Ad and the average velocity is ̄ ̄ ̄v=d/t v ̄ = d / t so that the flow rate is Q=Ad/t=A ̄ ̄ ̄v Q = Ad / t = A v ̄ .

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.

What is the formula of refrigeration effect?

ref = refrigeration . h = enthalpy, kJ/kg .

What is the rate of refrigeration?

Cooling capacity is the measure of a cooling system’s ability to remove heat. It is equivalent to the heat supplied to the evaporator/boiler part of the refrigeration cycle and may be called the “rate of refrigeration” or “refrigeration capacity”.

Is mass flow rate constant in a compressor?

Mass flow rate does remain constant as long as no mass is added or removed . Volume flow rate at standard conditions remains constant under changing thermodynamic conditions because it is calculated at a constant (imaginary) set of conditions.

How do you increase mass flow rate?

Considering the mass flow rate equation, it appears that for a given area and a fixed density, we could increase the mass flow rate indefinitely by simply increasing the velocity . In real fluids, however, the density does not remain fixed as the velocity increases because of compressibility effects.

What are the units of mass flow rate?

Mass flow rate is the amount of a mass moving through an instrument over time, so the unit of measure is mass (or weight) per unit of time and expressed as pounds/hour or kilograms/second or in some similar way.

What is the relationship between pressure and mass flow rate?

Bernoulli’s equation states mathematically that if a fluid is flowing through a tube and the tube diameter decreases, then the velocity of the fluid increases, the pressure decreases, and the mass flow (and therefore volumetric flow) remains constant so long as the air density is constant.

What is mass flow rate used for?

Mass flow devices are used for applications requiring high accuracy, precision measurement and control of the flow of gas molecules . There are so many applications that benefit from measuring and controlling mass flow, from bioreactor outgassing to fuel cell membrane testing to natural gas monitoring.

Why is mass flow rate important?

Direct mass flow measurement is an important development across industry as it eliminates inaccuracies caused by the physical properties of the fluid, not least being the difference between mass and volumetric flow. Mass is not affected by changing temperature and pressure.