The inner and outer surfaces of a 0.5-cm-thick, 2-m × 2-m window glass during winter are 10 ◦c and 3 ◦c, respectively.

if the thermal conductivity of the glass is 0.78 w/m·k, determine the amount of heat loss (not the rate of loss) through the glass over a period of 5 hr.

what would your answer be if the thickness of the glass was 1 cm?

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Journeyman training is usually related (clo2) a)-to specific tasks b)-to cost analysis of maintenance task c)-to control process to ensure quality d)-to installation of machinery

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.