Queremos construir un horno de ladrillo refractario con 6 pulgadas de espesor, con una conductividad térmica de 0.93 joules/pies-seg-°F reforzado con miembros de acero al carbón dentro del ladrillo, el área total de la sección transversal del mismo es equivalente al 2,25% del área interior de la pared del horno. Si la conductividad térmica del acero de refuerzo es de 75 joules/pies-seg-°F calcular lo siguiente: a) Las relaciones proporcionales del calor total transferido a través de la pared por el ladrillo y por el acero al carbón, b) la pérdida de calor por cada metro cuadrado de la pared si el lado interior de la pared está a 350°F y el lado exterior está a 85°F

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

Most leaks in reciprocating air compressors can be detected and minimized by: (clo4) a)-detecting leakage areas using ultrasonic acoustic detector. b)-tightening joints and connections c)-replacing faulty equipment d)-all of the given options