1. T (x) = a + bx + cx2 in a place with a thickness in a place with L = 0.3m inside thickness. In this equation T is the temperature units of Celsius and x meters are given as a = 200 ° C, b = -200 ° C / m, c = 30 ° C / m2. Thermal conductivity of the wall coefficient k = 1 W / m. K. a) The kiosk is outside, losing heat to the outside and outside, bedroom stored calculation. b) What is the heat transfer coefficient when the branch of the wall comes into contact with a fluid having a temperature of 100 ° C at x = L?

Fluids at rest possess no flow energy. a)- true b)- false

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.