How do you read enthalpy and pressure diagrams?
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How do you read enthalpy and pressure diagrams?
On the P-H diagram, pressure is indicated on the y-axis and enthalpy is indicated on the x-axis. Typically enthalpy is in units of Btu/lb and pressure is in units of pounds per square inch (psi). The upside down U figure shown on the diagram designates the points at which the refrigerant changes phase.
Why do we use pH diagram?
A p-h diagram is a figure with a vertical axis of absolute pressure and a horizontal axis of specific enthalpy. It is an important diagram used frequently for a performance calculation of a refrigerating machine. A p-h diagram has a lot of thin lines, whose names and natures are important.
What is meant by Mollier diagram explain?
Definition of Mollier diagram : a diagram showing thermodynamic properties of a substance with various quantities (as temperature and pressure) constant especially in terms of entropy and enthalpy as coordinates.
What is a pH in HVAC?
Pre-Heat + 1 variant. 1. PH. Pre – Heat.
How do you calculate enthalpy of steam?
This Enthalpy for Saturated Steam can be obtained at atmospheric pressure from above Table, i.e., hg = 2676 KJ/Kg, So now Enthalpy required for saturated liquid to convert into saturated steam can be obtained as follows, Latent Heat ( he ) = hg – hf = 2676 – 419 = 2257 KJ / Kg.
What is entropy of steam?
Also, like enthalpy, the entropy of a substance is given with respect to some reference value. For example, the specific entropy of water or steam is given using the reference that the specific entropy of water is zero at 32°F.
How is entropy calculated steam?
4.6
- Enthalpy in wet region is calculated by.
- h = hf + xhfg.
- h = hf + x( hg – hg)
- Where h is enthalpy at any point in the wet region, h f is enthalpy at the saturated liquid, hg is enthalpy at saturated vapor and x is the quality of steam.
- Entropy in wet region is calculated by.
- s = sf + xsfg.
- s = sf + x(sg – sf)
