3 replies to this topic

[DANA-IF]

Hi friends

 

Iid like to know how to have the enthalpy of air (Hin  , Hout) from air cooler simulation on hysys or how to calculate

 

them ?

 

Regards 

Thanks 

[mrbabu]

do you know tin, tout ?

then you can calculate enthalpy difference assuming constant cp

enthalpy of stream = specific heat * (T-Tref) * mass flow

see for example

 

http://www.engineeri...res-d_1535.html

 

as alternative you can use the simulator to export the values of enthalpy in different streams,

you may for example export in Excel, I do that with PRODE and

macro StrH() which returns directly the enthalpy  of a stream,

for example if stream 1 is the air to air cooler and stream 2  the air

from air cooler your value would be  =StrH(2)-StrH(1)

[DANA-IF]

Hi thank you,  but the equation

 enthalpy of stream = specific heat * (T-Tref) * mass flow    

gives a unit : kcal /hr 

 

I'd like to have mass enthalpy with Kcal /kg 

 

I found this link , it is very useful, you just have to input temperature and pressure of air 

 

http://www.peacesoft...rte/luft_e.html

 

then you click on calculate and you will have calculated properties

[mrbabu]

N.BH wrote

the equation enthalpy of stream = specific heat * (T-Tref) * mass flow    

gives a unit : kcal /hr  I'd like to have mass enthalpy with Kcal /kg

 

you can calculate specific enthalpy as specific heat * (T-Tref)