Liquid ethanol is a flammable fluid and can release vapors that form explosive mixtures at temperatures above its flash point at 16.6°C. In a chemical plant, liquid ethanol (cp = 2.44 kJ/kg•K,?? = 789 kg/ m3) is being transported in a pipe with an inside diameter of 5 cm. The pipe is located in a hot area with the presence of an ignition source, where an estimated 20 kW of heat is added to the ethanol. Your task as an engineer is to design a pumping system to transport the ethanol safely and to prevent fire hazard. If the inlet temperature of the ethanol is 10°C, determine the volume flow rate that is necessary to keep the temperature of the ethanol in the pipe below its flash point.
Liquid ethanol is being transported in a pipe where heat is added to the liquid. The volume flow rate that is necessary to keep the ethanol temperature below its flashpoint is to be determined.
Assumptions 1 Steady operating conditions exist. 2 The specific heat and density of ethanol are constant.
Properties The specific heat and density of ethanol are given as 2.44 kJ/kg?K and 789 kg/m3, respectively.
Discussion To maintain the ethanol in the pipe well below its flashpoint, it is more desirable to have a much higher flow rate than 0.00157 m3/s.
You might also like to view...
What is meant by the term "detent"?
A. slow motion of a contact to ensure good electrical contact B. rapid making and breaking of a contact C. the compensation furnished by heaters in the thermostat D. the control of the blower in the air handler
An axle ratio is 3.1:1. The driveshaft is turning 1000 rpm. What is the rpm of the rear axle to the nearest tenth?
A. 322.6 B. 322.8 C. 323.0 D. 323.2
The first known cooperative in the United States was organized during colonial times by Benjamin Franklin
Indicate whether the statement is true or false
In a 2-ton capillary tube system, the unit does not develop full capacity. Head pressure is low and suction pressure is high. What is the problem?
What will be an ideal response?