thermodynamics, Mechanical Engineering


Q2 A 3kW electric water heater is a cylindrical element having outside diameter 10mm. The heat transfer between the heater and the surrounding water is 980W/m2K.
Determine the length of the heater if the surface temperature must not exceed 95oC when the water is at 65oC.

The element comprises an electric resistance heater, diameter 2mm in the centre of the 10mm diameter stainless steel tube which has a wall thickness of 1mm. The gap between the resistance heater and the inside of the tube is packed with a ceramic material, Thermal conductivity 2W/mK.

Determine the temperature of the electric heater element. You may assume that the heater element is at uniform temperature and the thermal resistance between the element and the ceramic is negligible. The thermal conductivity of the stainless steel is 16W/mK
3 marks


Posted Date: 2/12/2013 11:57:32 AM | Location :







Related Discussions:- thermodynamics, Assignment Help, Ask Question on thermodynamics, Get Answer, Expert's Help, thermodynamics Discussions

Write discussion on thermodynamics
Your posts are moderated
Related Questions
Seasonal-Component Analysis: A food processor uses a moving average to forecast next month's demand. Actual demand data for the past few months is available as depicted in the

What is melting point of aluminium?

Explain the Automation in Machining? The word "automatic" is derived from Greek and it means "self-moving or "self thinking". The word "automation" has been used to refer to a

LIMITATIONS OF GAS TUNGSTEN ARC WELDING (GTAW) It Produces lower deposition rates than consumable electrode arc welding processes. It Requires slightly more skill as comp

Special Casting Methods: 1. Die casting : Die casting is a permanent mould casting techniques in which molten metal is forced in the mould cavity under a pressure of 700 to

Part Contact States The loading, movement and unloading of parts via the manufacturing system should be scheduled through supervisory computer. In contrast along with classical

Longitudinal strain produced - hollow cast iron cylinder: A hollow cast iron cylinder 4 m long, 300 mm is the outer diameter, and thickness of metal 50 mm is subjected to cen

Q. Nozzle Design Loads? Minimum nozzle design loads shall be in accordance. F = Axial force on centre line of nozzle (lbs); Maximum Transverse Force =1.5F F R = Resultan

Find the Machine Torque Angle (a)  What are the four operating conditions that must be satisfied before a synchronous machine can be synchronised to an electrical grid? (b)

Jewels can only be removed for polishing from either end of the necklace