AWVDevices - liquid at the average temperature between the...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
1 ME 416 Computer Assisted Design of Thermal Systems Air -Water Vapor Devices (Air Processing Devices) Heating Coils: Air-Water Vapor mixture is heated at constant pressure. The moisture content (humidity ratio) will stay constant. The first law is simply written: h = h q m av,out av,in in a + Cooling Coils: Air-Water Vapor mixture is cooled at constant pressure. The moisture content will stay constant until saturation is reached at which time further cooling will produce condensation. If this point is reached liquid water will leave the system and the air-water vapor leaving the system will have a relative humidity of 100%. The first law is written: ( 29 h = q m + h + - h av,in out a av,out in out ,out ϖ ϖ l The exit enthalpy of the liquid water should be taken as the enthalpy of saturated
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: liquid at the average temperature between the dew point temperature of the entering air-water vapor mixture and the dry bulb temperature of the exiting air-water vapor mixture. Evaporative Spray Cooler: A spray of liquid droplets is introduced to the air-water vapor mixture. The liquid evaporates into the mixture giving rise to cooling. The first law is written: ( 29 h + -h = h av,in out in ,in av,out ϖ ϖ l Steam Humidifier: Steam is mixed with the inlet air-water vapor mixture, so as to increase its moisture content (humidity ratio). The first law is written: ( 29 h + -h = h av,in out in tm,in av,out ϖ ϖ s...
View Full Document

This note was uploaded on 07/25/2008 for the course ME 416 taught by Professor Somerton during the Fall '07 term at Michigan State University.

Ask a homework question - tutors are online