Hi! I need urgent help with the following task! Could someone have a look at it and tell me if the solutions are correct? Many thanks!

__A coil is wrapped around a pipe that carries a fluid which needs to be heated.__

**Pipe**

(U) change in thermal energy = ?

(m) mass flow rate = 0.1kg/s

(C) specific heat capacity = 1970J/kgK

(Tpin) Initial fluid temperature = 50 (Converted to Kelvin 323K)

(Tpout) Final fluid temperature = 140 (Converted to Kelvin 413)

(T) Change in temperature

**Coil**

(U) change in thermal energy = ?

(m) mass flow rate = 0.15kg/s

(C) specific heat capacity = 500J/kgK

(Tcin) Inlet temperature = 500 (Converted to Kelvin 773)

(Tcout) Outlet temperature = 140 (Converted to Kelvin 413)

(T) Change in temperature

**(Q2) Heat energy rate of coil:**

U = mCT

U = 0.15kg/s * 500J/kgK * (773 - 413)

U = 27000J/s or 27x10^3 J/s

**(Q2) Efficiency of heat transfer process:**

Efficiency = Tpin-Tpout/(Tpout-Tcin)

Efficiency = (323-413)/(413-773)

Efficiency = 0.25

or 0.25x100 = 25%

## Comments rated to be Good Answers:

Re: Heat Transfer Process - URGENT!!" by jcchiefeng on 06/06/2009 9:12 AM (score 3)