Download presentation

Presentation is loading. Please wait.

Published byAdonis Knapp Modified over 3 years ago

1
How to read the Humidity chart & do the operating diagram for Cooling tower of Air-Water at 1 atm. Assume you have air of a definite air- water mixture at dry bulb temp T 1 and wet bulb temp T w1

2
T1T1 T w1 (a) 1. Find point (a) which represents this air on the chart

3
T1T1 T w1 (a) 2.The moisture content of this air Y 1 is given by point (b) kg of water vapor/kg dry air (b) Y1Y1

4
T1T1 T w1 (a) 3.The Dew point of this air is given by point (d) to which this air should cool down at constant Humidity (b) Y1Y1 (d) (e ) (c)

5
T1T1 T w1 The Adiabatic Saturated Temp T s and and Saturated humidity Y s of this air is given by points (f&g). To find these points : start from point (a) follow the adiabatic cooling line to 100% line on point (e), then read T s at point (g) and Y s at point (f) Note: for air water system the wet bulb T w1 apparently resembles the adiabatic saturation temp. T s (b) Y1Y1 (d) (c) (e ) (f) TsTs YsYs (g) (a) C s (T-T s ) +Y s = Y s s

6
T1T1 (k) (a) To find Enthalpies h 1 of air of point (a) coordinate, follow the enthalpy line through point (a) to its intersection (k) with enthalpy scale line. h1h1

7
Equilibrium curve: is a plot of h * vs. T L find Enthalpy h * of a saturated vapor - air mixture in equilibrium with the liquid bulk, j/kg dray air at liquid temp, follow the temp line to its intersection with 100% line and the read h* on enthalpy scale line which given by point m. T1T1 (k) (a) h1h1 T L1 (m) h*h*

8
Operating diagram Air-Water at 1 atm This fig. contains the saturated enthalpy carve, and on this plot is point (A) representing the conditions at the bottom of the tower (T L1 & h 1 ). Point (B) represents the conditions at the top of the tower (T L2 & h 2 ). m. G & m. L are the mass follow rates of gas and liquid (H 1 &H 2 are water enthalpies) Equilibrium Curve h * (Sat’d air) vs T L A B Enthalpy of air – water vapor J/kg dry air Water Temperature h1h1 T L2 h2h2 T L1 Slope =(m. L /m. G )C L H1H1 H2H2

Similar presentations

OK

Moisture Moisture = Water Vapor (gas) Gets into the atmosphere by: 1.Evaporation = liquid to gas (opposite of condensation) 2.Transpiration = plants release.

Moisture Moisture = Water Vapor (gas) Gets into the atmosphere by: 1.Evaporation = liquid to gas (opposite of condensation) 2.Transpiration = plants release.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To ensure the functioning of the site, we use **cookies**. We share information about your activities on the site with our partners and Google partners: social networks and companies engaged in advertising and web analytics. For more information, see the Privacy Policy and Google Privacy & Terms.
Your consent to our cookies if you continue to use this website.

Ads by Google

Ppt on you can win the race Ppt on do's and don'ts of group discussion Ppt on international business management Download ppt on world trade organization Ppt on sectors of economy Ppt on earth damage Ppt on nature and human interaction Bill of rights for kids ppt on batteries Ppt on holographic technology major Free download ppt on ms access 2007