It uses for this example evaporating and condensing temperatures of 0f and 120f. Frage zu logp,hdiagramm eines kaltemittelprozesses r4a. Figure 4 is a pressureenthalpy diagram of a typical refrigeration cycle in a system with one pound of hfc4a. In order to properly understand this diagram, it is best to go through the vapor compression cycle on a ph diagram.
The corresponding p h diagram is shown in figure 2a. Ph diagrams s hown in f igure 2 were plotte d wit h respect to thermody namic prop erties i n refpro p program. Ph diagram thermodynamics hvac and refrigeration pe exam. It is intended to be used for advanced technical applications. Per meglio dire non riesco ad ottenere risultati sufficientemente esatti. Figure 42 ph diagram for the refrigeration system figure 43 refrigerant flow diagram for the refrigeration system. P h diagram r4a pdf p h diagram r4a pdf p h diagram r4a pdf download. Ammonia, nh3 pressureenthalpy diagram sspecific entropy, kjkgk ttemperature. Frage zu log p,hdiagramm eines kaltemittelprozesses r4a. Unilab srl focus sui nuovi refrigeranti conferenza tecnica coils 8. Points on the diagram are labeled to correspond to locations of equipment in the system. Dupont has now made an updated version of its dupont refrigerant expert 4.
The vapor is compressed, following the constant entropy line to the pressure cor. Characteristics of some new generation refrigerants with low. R4atables excel addin sample calculations in excel. Refrigerant solstice n40 r448a, hfo, 404a r22 replacment. Download a pdf copy of the pressure enthalpy chart for both metric and imperial units. R 4a ph mollier chart i can find the plain old boring ones online, but, i want a more simplistic one hopefully with a touch of colour to put in my report which is a little easier for the supervisor to read. An ideal rankine cycle is shown in the diagram below. R 4a p h mollier chart i can find the plain old boring ones online, but, i want a more simplistic one hopefully with a touch of colour to put in my report which is a little easier for the supervisor to read. Huber national institute of standards and technology, marcia. R4a pressure enthalpy chart the engineering mindset.
Refrigerants temperature and pressure at constant boiling. Druck bar enthalpie kjkg 100 150 200 250 300 350 400 450 500 550 600 r4a. Thermodynamic properties of r4a 1,1,1,2tetrafluoroethane m. Location properties 1 t 45 c, saturated liquid 12 specific pump work 1. Log ph diagram for opteon xp40 in the updated duprex 4. The primary purpose of refrigeration is producing and maintaining the temperature which is lower than that of the surroundings. Esercizio 09r4a diagrammaph termodinamica applicata. Chapter 3 refrigerants and mixture preparation refrigeration is the process of removing heat from the space to be cooled and transferring it to a place where it is unobjectionable. Ph diagram theoretical cycle archive refrigeration. The log ph diagrams on this page can be retrieved from the coolpack program, which can be downloaded here. The primary purpose of refrigeration is producing and maintaining the.
Nov 25, 2015 unilab srl focus sui nuovi refrigeranti conferenza tecnica coils 8. The shaded domelike region outlines when the compound is both a mix of saturated liquid and saturated vapor. R4a is the refrigerant on the illustrated diagram at 100 degrees f state point a is located near the bottom of the condenser where the refrigerant is a saturated liquid at the condensing temperature and pressure. Swep is a worldleading supplier of brazed plate heat exchangers for hvac and industrial applications. Despite the carbon dioxide cycle operating in the subcritical region, the operating pressures remain higher than the corresponding pressures in the r404a high. Standard calorimeter conditions 110% flowevap capacity efficiency 90% 100% % 70% 80% s r404a 50% n40 v 60% 40%. As shown in figure 4,the p h diagram moeller diagram for refrigeration cycle with four basic processes are frequently used in the analysis of vapour compression refrigeration cycle, process 1to 2 is compression, process 2 to 3 heat rejection in the condenser,process 3 to 4. Modeling and investigation of refrigeration system performance with twophase fluid injection in a scroll compressor rui gu marquette university recommended citation gu, rui, modeling and investigation of refrigeration system performance with twophase fluid injection in a scroll compressor 2016. Thermodynamic properties of r4a 1,1,1,2tetrafluoroethane. I refrigeranti sono i fluidi operativi nella refrigerazione, nel condizionamento daria, e nei sistemi a pompa di calore. See more of refrigeration and airconditioning engineering on facebook. Enthalpy kjkg 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 pressure bar 0,50 0,60 0,70 0,80 0,90 1,00. As shown in figure 4,the ph diagram moeller diagram for refrigeration cycle with four basic processes are frequently used in the analysis of vapour compression refrigeration cycle, process 1to 2 is compression, process 2 to 3 heat rejection in the condenser,process 3 to 4.
Modeling and investigation of refrigeration system. Each step of the cycle can be approached separately. The vapor is compressed, following the constant entropy line to. Entropy is the measure of the amount of disorder in the system. It is very easy to use and gives the basic cycle performance both graphically and in text fo. Pressureenthalpy chart, r4a 1,1,1,2tetrafluoroethane. Unilab srl focus sui nuovi refrigeranti conferenza. The diagram is attached to the annex at the end of examination textbook for the first and second class. This diagram describes the relationship of pressure and enthalpy of a select refrigerant. The ph diagram and the refrigerant flow diagram are as the following.
Po box, the heath, runcorn, cheshire, wa7 4qx tele. Characteristics of some new generation refrigerants with low gwp. This page shows log ph diagrams for the following refrigerants. Simulation of airconditioning compressor with different. As it is clear i n figure 2a, w here r4a gas is c ompared with t he alternatives. For thermodynamic properties the library uses new industrial formulation for r4a 1,1,1,2tetrafluoroethane, formulated in helmholtz energy. Similarly, the expansion device is characterized by the suction and discharge pressures. The corresponding ph diagram is shown in figure 2a. Actually it is log pressure versus enthalpy up mollierchart cooltime if you need to compare the performance of refrigerants, this program will suit your needs. P h diagrams s hown in f igure 2 were plotte d wit h respect to thermody namic prop erties i n refpro p program. Water is the working fluid and the properties of each state are shown below. I cicli termici delle macchine operatrici paolo di marco versione 2009. Case1 the basics of refrigeration cycle ph diagram analysis.