The document discusses a combined separating and throttling calorimeter, which is used to find the dryness fraction (x) of steam. It measures x using two methods - a separating calorimeter that calculates x1 as the ratio of steam mass to total sample mass, and a throttling calorimeter that uses enthalpy calculations before and after throttling to find x2. The overall dryness fraction x is calculated as the product of x1 and x2.

1. Elements of Mechanical Engineering
Combined Separating and
throttling calorimeter
Sunilkumar M. Patel
130990136045

2. Combined Separating and throttling
calorimeter
 Function :- Find the Dryness fraction (x) of Steam.

3. Combined Separating and throttling
calorimeter
 Why we use Combined Separating and throttling
calorimeter . . . ? ?

4. Construction . . .

5. Calculation of dryness fraction. . . .
 For Separating Calorimeter
x1 = Ms/Ms + Mw

6. Calculation of dryness fraction. . . .
 For Throttling Calorimeter
Enthalpy before throttling = Enthalpy after throttling
Hf1+x2Hfg1 = Hf2 +Hfg2 +Cps(Tsup – Tsat)
x2 = Hg2 +Cps(Tsup – Tsat) – Hf1
Hfg1

7.  If x is initial dryness fraction of steam
 Water droplet in steam sample = (1-x)(Ms + Mw) kg
 For separating calorimeter = (1-x1)(Ms + Mw) kg
 For throttling calorimeter = (1-x2)Ms kg

8. Water droplet in steam sample = water droplet removed
by separating calorimeter + water droplet passed through
throttling calorimeter.
x=x1.x2