[ytszazu]

Dear all,

Do you mind telling me if my formula's are correct?

Regards,

zazu.

Hot gas                  
   Initial temperature      Th   =      C
   Final temperature      TF   =      C
   Mass of hot gas      Mh   =      kg
   Cp of hot gas      Ch   =      kJ/kg.K
Cold gas                  
   Initial temperature      Tc   =      C
   Final temperature      TF   =      C
   Mass of cold gas      Mc   =      kg
   Cp of cold gas      Cc   =      kJ/kg.K

Formulas                  

(Mh*Ch*(TF-Th)) + (Mc*Cc*(TF-Tc)) = 0                  
(Mh*Ch*TF) - (Mh*Ch*Th) + (Mc*Cc*TF) - (Mc*Cc*Tc) = 0            
(Mh*Ch*TF) + (Mc*Cc*TF) = (Mh*Ch*Th) + (Mc*Cc*Tc)            
TF(Mh*Ch + Mc*Cc) = (Mh*Ch*Th) + (Mc*Cc*Tc)               
TF = ((Mh*Ch*Th) + (Mc*Cc*Tc)) / (Mh*Ch + Mc*Cc)                  

[Borek]

(Mh*Ch*(TF-Th)) + (Mc*Cc*(TF-Tc)) = 0

Why do you add deltaQc and deltaQh? They should be identical - so you should subtract them.

[Donaldson Tan]

(Mh*Ch*(TF-Th)) + (Mc*Cc*(TF-Tc)) = 0

Why do you add deltaQc and deltaQh? They should be identical - so you should subtract them.

Ytszazu's equation is right:
-dQh = Mh*Ch*(TF-Th)
+dQc = (Mc*Cc*(TF-Tc)

[Borek]

Sorry, my mistake 

[uamjad]

Ytszazo.... your equation is right...


cheers..!!!