Calculation formula for refrigerant flow rate

『Calculation formula for refrigerant flow rate』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)

1. Calculation of single machine stacked capillary tube ratio

The calculation of single machine stacked capillary tube ratio requires comprehensive theoretical calculation and experimental debugging, with the core of balancing the flow rate of refrigeration buffer and system heat load, and ultimately verified through actual measurement. Before determining the system parameters, it is necessary to specify the cooling capacity (Q) and cover the load requirements of both low and high temperature levels. Setting the evaporation temperature ($T {e} $) and the perturbed condensation temperature ($T {c} $) directly affects the physical parameters of the refrigerant, such as viscosity and density. When choosing low/high temperature refrigerants, priority should be given to compatibility, for example, R23 is commonly used for low temperature refrigerants, and R404A is optional for high temperature refrigerants. 2. Calculation of refrigerant flow rate for low temperature refrigerants: $m {l}=Q/\ Delta h {l} $, where $\ Delta h {l} $is the enthalpy difference of the refrigerant in the evaporator. The formula for high-temperature flow rate: $m {h}=Q_ {h}/\ Delta h {h} $, where $Q_ {h} $needs to include the condensation heat and self load of the low-temperature stage, and $\ Delta h {h} $corresponds to the enthalpy difference of the high-temperature stage. The flow calculation results directly affect the selection of capillary tubes

3. Two methods are usually used for capillary tube flow matching: • Empirical formula method: In the formula $m=C × d ^ {n} × \ Delta P ^ {m} $, the coefficients $C $, $n $, and $m $need to refer to the refrigerant manual or experimental data. For example, there is a significant differenc

4. Capillary size design based on flow rate to deduce inner diameter (d) and length (L): for every 0.1mm increase in inner diameter, the flow rate may increase by 15% -20%; If the length increases by 10%, the traffic will decrease by about 5%. During actual design, iterative adjustments are required, such as initially selecting d=1.0mm and L=2m, and then correcting based on the measured pressure difference. 5. Experimental verification and calibration: The system is operated on an experimental platform to monitor the evaporator/condenser temperature, high-pressure side pressure, and refrigeration output. If abnormal superheat or high pressure ratio is found in the return air, the length of the capillary tube should be shortened or the diameter should be increased. Usually, 3-5 parameter adjustments are required to achieve thermal balance and optimal energy efficiency.

2. How to calculate the power and cooling capacity of a refrigerator compressor

There are various methods for calculating the power and cooling capacity of a refrigerator compressor, as follows: Calculation of cooling capacity: Formula method: Cooling capacity Qo=Gqo=qvVs * λ.

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