This question is 3 years old, so maybe you have figured out the answer.

The hysteresis model is adapted from (**Egolf and Manz 1994**) study, and the idea is to convert a continuous function of enthalpy to a discontinuous function.

- Question :
**there is any solution to get numbers for material property:phase change from this chart as it needs increasing values like ordinary enthalpy curves, not partial enthalpy.**

To get the continuing (increasing values like ordinary enthalpy curves) enthalpy chart, you only sum the partial enthalpy with the previous values. For example, htot(23) = hpart(23) + hpart(22) + hpart(21) + hpart(20); and so on for each temperature.

To create a continuous enthalpy chart (increasing values like ordinary enthalpy curves), simply accumulate the partial enthalpy values for each temperature with the previous ones. For instance, htot(23) = hpart(23) + hpart(22) + hpart(21) + hpart(20).

- Question :
**high/low temperature differences of melting /solidification curve**

Let's take the freezing curve as an example.

Upon the InputOutput Document, the **Low/High Temperature Difference of Freezing Curve (tau1/tau2)** are defined as **the width of the enthalpy/specific heat freezing curve, on the low/high side of the peak freezing temperature**. Simply, tau1 = T1-Tf; tau2 = Tf-T2, where Tf is the **Peak Freezing Temperature** defined as **the center (peak) of the freezing curve**.

Also see : **EnergyPlus Fortran Documentation** and **The transition process model**