DuPont Freon 12 Saturation Properties Temperature reading comprehension thermodynamic propertiesFigure A14 P-h diagram for refrigeranta. manual describes the version of EES developed for Microsoft Windows operating systems, including .. format. The first argument of the function is the substance name, Ra in this case. The PropPlot %%1 PH 2 %%2 %%3 0 DoQLines automatically determine the file type independent of the filename extension. mollier chart for thermal engineering if looking for the ebook by mollier chart for free pdf download mollier free thermal engineering rs khurmi file type pdf table mollier . replacement for ra in refrigeration applications thomas j leck dupont.
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Post on Mar views. Refrigerant r12 properties table filetype pdf – r12 properties table filetype pdf Product Data Summary and Thermodynamic Tables.
The enthalpy lines are the vertical lines. This work is shown in the figure above as the difference between the compressor entering enthalpy Dkpont and the leaving enthalpy H2.
In an ideal condenser, no sub-cooling occurs. Entropy is the measure of the amount of disorder in the system. The locations to the left of the saturated liquid curve indicate that the refrigerant is in liquid form and locations to the right of the saturated vapor curve indicate that the refrigerant is in vapor form. Cooling temperature Chlorinatedfluorocarbons CFCs or freons: Published on Dypont View Download 4.
The condenser proceeds from right to left supont the following three steps: In this region, the P-H diagram shows horizontal temperature lines, which indicate constant temperature. The evaporator moves the refrigerant from point A partial liquid-vapor mixture to point B, a fully saturated vapor refrigerant.
The mix region is the phase change region, where any addition of enthalpy will cause additional liquid to vaporize instead of raising the temperature. It is recommended that the engineer get a copy of the P-H diagram for Ra and the other common refrigerants. It is filetupe to note that in the mix region, the pressure and temperature are dependent variables.
Thermodynamic Properties of R12 Documents. The compressor is characterized by the refrigerant suction and discharge conditions. This horizontal line is a line of constant pressure, corresponding to the discharge pressure of the compressor.
Then the incoming temperature of the compressor, as determined by the leaving temperature of the evaporator, is used as the starting point of the compressor, as shown by point B’ on the figure below. The amount of gas that is formed during this expansion is called flash gas. Refrigerant R12 properties Download Report. A common question is to determine the heat expelled by the condenser, which is shown in the figure above as the difference between the condenser entering condition H2 and the leaving condition H4.
Compression occurs at constant entropy, also known as isentropic compression. The skeletal graph shown below shows the pressure-enthalpy lines.
In order to properly understand this diagram, it is best to go through the vapor compression cycle on a P-H diagram. The table shows the smallest size of outlet which should be reading blueprints pdf used with gutter where there are sockets these. Heat is lost to the condenser cooling medium as the vapor is condensed to a liquid. The compressor then increases the pressure of the refrigerant up to the discharge pressure.
Refrigerant R12 properties
In an ideal evaporator, there is just enough heat transfer to convert all the liquid to gas and nothing more. The expansion device is the counterpart of the compressor. Refrigerant R22 – Properties Documents. The input condition of the expansion device is determined by the condenser output conditions.
Starting a System with Liquid Refrigerant in the Compressor. Experimental study of new refrigerant mixtures to replace R12 in domestic refrigerators Documents. The left vertical curve indicates the saturated liquid curve and the right vertical curve indicates the saturated vapor curve.
In this region there are vertical temperature lines, which increase as enthalpy is increased. Effects of refrigerant properties on refrigerant performance Home Documents Refrigerant r12 properties table filetype pdf – r12 properties table filetype pdf Product Data Summary and Thermodynamic Tables. Table are based on K for those whose criticalreading and writing the lakota language pdf temperatures are. Figure 8 is a simplified P-H diagram illustrating the constant temperature lines.
As the evaporator transfers heat to the refrigerant, there is no gain in temperature, since all the heat is used to convert the remaining liquid to a gas.
Refrigerant R12 properties
It is important to note that the pressure remains constant throughout the evaporator. The importance of this point is that at any point above, no additional pressure will change the vapor into a liquid. Horizontal lines are drawn across the refrigerant’s pressure enthalpy diagram for the suction and discharge pressures.
Quality is a measure of the ratio of vapor mass to total mass. If the compressor operates at a suction pressure of For example quality of 0.
Once the refrigerant is a fully saturated liquid, any additional heat loss results in a decrease in temperature. The equation to determine the work of the compressor is shown below. Therefore the intersection of the constant entropy line and the discharge pressure line will identify the final condition of the refrigerant gas leaving the compressor, as shown by point C’ in the figure below.
Throughout this explanation the refrigerant Ra is used as an example.