# Latent Heat Cannot be Less than zero

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 June 29, 2022, 03:26 Latent Heat Cannot be Less than zero #1 New Member   Hellboy Join Date: Apr 2018 Posts: 5 Rep Power: 6 Hi all, I'm practicing multiphase analysis in fluent, my problem involves air, R134a liquid & R134a vapour I have assign the properties and while going through initialization i have noticed this error. Compute Node ID: 3 From-phase Domain ID: 1 To-phase Domain ID: 2 Cell Number: 0 Latent Heat: -294579 ERROR: Latent heat cannot be less than zero! could you please help me to understand and resolve this error

 November 7, 2022, 04:20 #2 New Member   Sree Kumaran T Join Date: Nov 2022 Posts: 4 Rep Power: 2 have u found out how to solve the error cvnaditya likes this.

 November 12, 2022, 11:25 #3 New Member   Hellboy Join Date: Apr 2018 Posts: 5 Rep Power: 6 yes, it is solved

 November 12, 2022, 11:44 #4 New Member   Sree Kumaran T Join Date: Nov 2022 Posts: 4 Rep Power: 2 Can u share how did u solve it please

 November 12, 2022, 11:54 #5 New Member   Hellboy Join Date: Apr 2018 Posts: 5 Rep Power: 6 sure, in ansys it is suggested to consider latent heat for refrigerant in liquid material as zero in ansys fluent, latent heat is calculated from standard state enthalpy of phase participating in mass exchange only enthalpy difference matters hvl(enthalpy total or vapour & liquid at ref temperature)= hv(vapour enthalpy)-hl(liquid enthalpy) at reference temperatures so it is better to consider liquid enthalpy as zero

 November 12, 2022, 11:55 #6 New Member   Hellboy Join Date: Apr 2018 Posts: 5 Rep Power: 6 it is better to use Tref= Tsat hv, Tsat= hvl,Tsat

 November 12, 2022, 12:08 #7 New Member   Sree Kumaran T Join Date: Nov 2022 Posts: 4 Rep Power: 2 So in a evaporation condensation cycle should i put sse of water zero and air as it is

 Tags #multiphasefluent #vof