An electrical steam generator has rated power 1000 W and heat converting efficiency = 0.9. Water enters the inlet at 20 ∘ C and steam comes out from the outlet at 100 ∘ C . Latent heat of steam = 2250 J/g . What mass of water enters the device per second?

Q ˙ = 0.9 ( 1000 ) Q ˙ = 900 J/s q h = 4.2 ( 100 − 20 ) q h = 336 J/g q = 336 + 2250 q = 2586 J/g m ˙ = 2586 900 m ˙ ≈ 0.348 g/s

Start Free Mock LoginAlready registered? Login here

Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoCalorimetryMedium2 minQB

PhysicsMediumsingle choice

An electrical steam generator has rated power $1000 W$ and heat converting efficiency = 0.9. Water enters the inlet at $20^{\circ} C$ and steam comes out from the outlet at $100^{\circ} C$ . Latent heat of steam = $2250 J/g$ . What mass of water enters the device per second?

Options:

Answer:

Solution:

$\dot{Q} = 0.9 (1000)$
$\dot{Q} = 900 J/s$
$q_{h} = 4.2 (100 - 20)$
$q_{h} = 336 J/g$
$q = 336 + 2250$
$q = 2586 J/g$
$\overset{m}{˙} = \frac{900}{2586}$
$\overset{m}{˙} \approx 0.348 g/s$

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Calorimetry

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...