Temperature is a measure of how hot or cold an object is. P h diagram r4a pdf p h diagram r4a pdf p h diagram r4a pdf download. Figure a14 ph diagram for refrigerant4a figure a15 nelsonobert generalized compressibility chart table a16 properties of the atmosphere at high altitude table a17 idealgas properties of air table a18 idealgas properties of nitrogen, n 2. Understanding the p h diagram on the p h diagram, pressure is indicated on the ra4 and enthalpy is indicated on the xaxis. Scribd is the worlds largest social reading and publishing site. Figure a14eph diagram for refrigerant4a table a16eproperties of the atmosphere at high altitude table a17eidealgas properties of air table a18eidealgas properties of nitrogen, n 2 table a19eidealgas properties of oxygen, o 2 table a20eidealgas properties of carbon dioxide, co 2. Ts and ph diagrams for an ideal vaporcompression refrigeration cycle. Made by faculty at the university of colorado boulder, department of chemical and biological engineering. The vapor is compressed, following the constant entropy line to. The saturated vapor at state 1 is superheated to state 2.
R4a pressure enthalpy chart the engineering mindset. Untuk melihat besaranbesaran seperti tekanan, suhu, enthalpy dalam siklus refrigerasi biasanya digunakan diagram ph refrigeran tertentu. Pressureenthalpy diagram for freon 12 r22 ph diagram english units. Refrigerant r4a or hfc4a is a commercially available hydrofluorocarbon hfc refrigerant for use as a longterm replacement for r12 in new equipment and for retrofitting medium temperature cfc12 systems. Conditioning and refrigeration relations, tables and charts. The bubble to the left is the portion of the diagram where the refrigerant is in the saturated condition. Reading data of the diagram ph there is still many other information. This page shows log ph diagrams for the following refrigerants. A reversible, adiabatic isentropic compression of the refrigerant. Table 1 properties of saturated liquid and saturated it is important to note that the pressure remains constant throughout the evaporator. Ph diagram r12 pdf2pdr14 22 ph diagram r12 this ph diagram r12 pdf file begin with intro, brief discussion until the indexglossary page, look at the table of content for additional information, if provided.
Drybulb temperature tdb dry bulb temperature is usually referred to as air temperature, is the air property that is most common used. Ada banyak jenis refrigeran, setiap refrigeran memiliki diagram ph yang berbedabeda. The p h diagram and the refrigerant flow diagram are as the following. The pressureenthalpy diagram log ph diagram is a very useful tool for refrigerant technicians. Pressureenthalpy chart, r4a 1,1,1,2tetrafluoroethane.
The log ph diagrams on this page can be retrieved from the coolpack program, which can be downloaded here. Understanding the ph diagram on the ph diagram, pressure is indicated on the ra4 and enthalpy is indicated on the xaxis. Reviewed by faculty from other academic institutions. Giuliano keywords ukt air conditioning without external unit created date. Its going to discuss primarily concerning the previously mentioned topic in conjunction with much more information related. Pressureenthalpy diagram for r4a refrigerant ohio university. How to read a pressureenthalpy diagram in chemical engineering, it is often necessary to know how properties like pressure, enthalpy, volume, and entropy relate to each other at a certain temperature. These properties are the key to understanding and using refrigerant pressureenthalpy diagrams. Evaluation of hfo1234yf as a potential replacement for r4a in refrigeration. The blue line on the left of the bubble represents the 100% saturated liquid line. Thus the ph diagram is a widely used and very useful tool for doing an approximate evaluation of a refrigerator or heat pump system. The refrigerant flow diagram is to be read in conjunction with the ph diagram to get the entire picture of the system. In order to properly understand this diagram, it is best to go through the vapor compression.
Case1 the basics of refrigeration cycle ph diagram analysis. The molecular weights m o f refrigerants r4a, r1234yf and r1234zee are s imilar. Figure 6 ph diagram of the ideal vapor compression cy cle for refrigerants r4a, r1234yf and r1234ze e. In fact, in the official reference handbook supplied by the ncees to be used in the fundamentals of engineering exam, only the ph diagram is presented for r4a. H, for enthalpy or heat content v, for volume s, for entropy p, for pressure. Properties of refrigerant r22 saturated liquid and saturated vapor both imperial. Ph diagram of refrigerant r1234zee the d irect s earch of feasible d irections d sfd algorithm a nd software has b een used for optimization 14.
Dupont freon 12 saturation properties 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. Download a pdf copy of the pressure enthalpy chart for both metric and imperial units. R22 properties of r22 vapor volume, enthalpy and entropy at pressures. There is currently serious consideration of replacing it with r744 carbon dioxide in refrigeration and heat pump applications. Refrigerant r4a or hfc4a was developed to meet these needs. Pdf plotting of ph and ts diagrams of fluoropropylenes. Figure 42 p h diagram for the refrigeration system figure 43 refrigerant flow diagram for the refrigeration system. Het koudeproces en het log ph diagram in een log ph diagram kan het verloop van een koudeproces worden gevolgd. Pdf the report addresses issues of plotting the pressureenthalpy and temperatureentropy diagrams of fluoropropylenes as. The ph diagram and the refrigerant flow diagram are as the following. Po box, the heath, runcorn, cheshire, wa7 4qx tele.
When people refer to the temperature of the air, they are normally referring to its dry bulb temperature. First, an explanation of how the diagram is built up is given, and then its use is describ ed. This diagram describes the relationship of pressure and enthalpy of a select refrigerant. R4a has a global warming potential gwp of 0 with respect to carbon dioxide. Because energies exchanged with the refrigerant modify the enthalpy h of the refrigerant, energy flows can be read directly from the diagram as horizontal lines. How to read p h chart explained with numerical youtube. Pressure enthalpy diagram melting line40 o 40 c2 02 0. This guide will take you through the ph diagram for r4a. A pressureenthalpy diagram provides this information but can be cryptic to decipher. The lo g ph dia gram is better suited to represent the re frigeration cycle than the ts diagram and is therefore used predominantly. The pressureenthalpy diagram or ph diagram is a tool that all hvac and refrigeration engineers should be able to use proficiently. On the ph diagram, pressure lh indicated on the yaxis and enthalpy is indicated on the xaxis. How to read refrigerant property diagrams r4a youtube.
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