![]() ![]() You can easily access the high quality refrigerant chart by clicking on the refrigerants listed in the table. Pressure Temperature Specific Enthalpy Specific Entropy Specific Volume Saturated Liquid Evaporation Saturated Gas Saturated Liquid Evaporation Saturated Gas Saturated Liquid Evaporation Saturated Gas psig C: btu/lbm: kJ/kg/K: m/kg: 605.0: 254.3: 475.8: 727.7: 2.833: 3.209: 6.042: 0.001: 0.045: 0. This article is a continuation of our older article, which was well received by users, so we decided to update the P-H Diagram list and provide you with a more complete list of the world's commercial refrigerants. Calculate online thermodynamic and transport properties of water and steam, based on industrial (IAPWS-IF97) or scientific (IAPWS-95) formulation. Ductulator - Hand held rotating calculator used for sizing supply and return duct systems using the equal friction design method. Also in the superheated region, the constant-entropy lines incline sharply upward, and constant volume lines are flatter. HVAC design tools include such popular items as the Trane Ductulator, psychrometric charts, and load estimating forms. We all know that water boils at 212F (atmospheric pressure at. The book starts by reviewing the basic vapor-compression refrigeration cycle. With a completed pressure enthalpy plot, we can evaluate the major system components as well as calculate latent and sensible heat transfers. the enthalpy of the water (heat content in Btu/lb). The pressure enthalpy chart enables us to create a complete picture, or snapshot of the entire system. In two-phase region, the constant temperature lines are horizontal. This graph plots the water temperature vs. At higher temperatures, they are curves near the saturated liquid line. Set your preferences for these steam tables. The constant-temperature lines are nearly vertical in the sub-cooled liquid region. Should saturated steam be heated at constant pressure, its temperature will rise, producing superheated steam. In the two-phase region, the constant-dryness-fraction quality line subdivides the mixture of vapor and liquid. The saturated vapor line separates this two-phase region from the superheated vapor. The saturated liquid line separates the sub-cooled liquid from the two-phase region in which vapor and liquid refrigerants coexist. We sincerely hope you enjoy these new features.P-h enthalpy diagram consist of following lines:Įnthalpy “ h” is along x-axis and absolute pressure “ p” is along the y-axis, both expressed in logarithmic scale. If a riser (vertical pipe) is present in the wet return line, you can also plot/indicate the minimum recommended riser mass flow corresponding to a Kutateladze number of 3.2 (the normally used limit for backflow in a riser): Alternatively, you can also add it to the Coolselector®2 report by selecting it as an add-on to the standard generated features:įurther to the log(p)-h diagrams, Coolselector®2 v3.0.0, now allows you to vary capacity by varying mass flow or by varying circulation rates when plotting a performance curve for a selection in the wet return line. Temperature Specific Enthalpy Specific Entropy Saturated Quality. Using the buttons at the top of the screen when viewing the log(p)-h diagram, will allow you to copy or print the diagram. The equation to calculate pressure based on altitude is: P a tm 14.696 1 - 6.8754 x 10(-6) Z5.2559 psia x 2. Calculates steam and liquid water properties given two properties using the IAPWS Industrial Formulation 1997. Please be aware that using REFPROP with Coolselector®2 requires that you have REFPROP 9.0 or newer installed. from REFPROP, you can draw the log(p)-h diagrams for these as well by changing your preferences for refrigerant equations by going to the menu “Options | Preferences | Edit Preferences | Refrigerant equations”. These charts were provided courtesy of Danfoss, using their FREE CoolSelector 2 software. However, should you choose to use another refrigerant – or a refrigerant mix – i.e. Scroll down to find download buttons for pressure enthalpy charts in either Metric or Imperial Units. The log(p)-h diagrams are all based on data from ASEREP (v3.5.0). The log(p)-h diagrams look like this (e.g. Alternatively, you can view all available log(p)-h diagrams for each refrigerant by going to the “Tools” menu and choosing “Log(p)-h diagrams”: ![]()
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