CH ENGR 101B Chapter Notes - Chapter 5: Thermal Energy Storage, Defrosting, Heat Transfer Coefficient
9 Jan 2019
School
Department
Course
Professor
Document Summary
A thermal energy storage unit consists of a large rectangular channel, which is well insulated on its outer surface and encloses alternating layers of the storage material and the flow passage. Each layer of the storage material is a masonry slab of width w = 0. 05 m, which is at an initial temperature of. An ice layer forms on a 5-mm-thick windshield of a car while parked during a cold night for which the ambient temperature is 20 c. Upon start-up, using a new defrost system, the interior surface is suddenly exposed to an airstream at 30 c. The windshield thermophysical properties are = 2200 kg/m3, cp = 830 j/kg k, and k = 1. 2 w/m k. Cylindrical steel rods (aisi 1010), 50 mm in diameter, are heat treated by drawing them through an oven 5 m long in which air is maintained at 750 c.
