And finally here is due to the calculation of our thermostatic expansion valve valve with orifice.

Today we'll explain how to calculate thermostatic expansion enthalpy tables valve is performed. For correct dimensioning a thermostatic expansion valve mechanical type is necessary to know and determine the following parameters: - Type of cooling-capacity evaporator - (Qe) temperature / pressure evaporation - (Te / Pe) Minimum coolant temperature -Temperatura/presión (Tc / Pc) at the inlet of the thermostatic valve condensation enthalpy tables (Tl)-pressure drop in the liquid line, evaporator-Retail (deltaP)
2nd-Then go to determining the potential enthalpy tables required to the valve and then, using the potential of the evaporator (Qe) to choose from, with some evaporation temperature, the required capacity of the valve. If you need to adjust enthalpy tables the cropping function of the refrigerant evaporator. Note: In the process of the calculation of thermostatic enthalpy tables expansion valve we consider that the provision of an evaporator rises when the coolant enters the evaporator enthalpy increase that may be selected by a smaller valve. Formula for determining cooling: vacuum enthalpy tables Delta = Tc - Tl
All valve manufacturers provide tables with correction factors relevant to cool, then choose the appropriate correction enthalpy tables factor (FSUB) coincides with the calculated value and determine the potential enthalpy tables required to the valve with the formula: deltaq sub = Qe / FSUB
3rd-At this point go to the port, use the pressure valve, evaporator temperature enthalpy tables and calculated to select the appropriate size of the potential hole in the corresponding table to choose the evaporating refrigerant capacity. Then change to choose enthalpy tables the type of thermostatic charge enthalpy tables and therefore if the work is normal or low temperature is always recommended an external equalizer. A practical example:
Refrigerant R134a (Qe) 6 Kw power evaporator, evaporation temperature (Te) -10 C, temperature of condensation (Tc) +30 C, the coolant temperature (Tl) +20 C, pressure drop (deltaP) 1.5 bar. Then we make our data as follows:
2 - power required by the valve: vacuum manifold Delta t = 30 - 20 = 10. C by the correction tables subcool manufacturers vacuum manifold Delta t = 10 C a correction factor equal to 1.08 is obtained and then the outlet valve is deltaq sub = 6/1.08 = 5.55. KW
And finally here is due to the calculation of our thermostatic expansion valve valve with orifice. Links of interest: as an air conditioner and a video of how to install an air conditioner works.
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