AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... ·...

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Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry and Air-Conditioning Dr. Eng. Sameh Shaaban 5 December 2009 Air is commonly heated and humidified in winter and cooled and dehumidified in summer.

Transcript of AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... ·...

Page 1: AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... · Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry

Slide Nr. 1 of 13 Slides

AIR-CONDITIONING PROCESSES

Mon 2:04:28 PM

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009

Air is commonly heated andhumidified in winter and cooledand dehumidified in summer.

Page 2: AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... · Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry

Slide Nr. 2 of 13 Slides

Simple Heating and Cooling (ωωωω = constant)

Mon 2:04:28 PM

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009

tch paa =

Enthalpy of mixture per unit mass of dry air Cooling

Page 3: AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... · Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry

Slide Nr. 3 of 13 Slides

Heating with Humidification

Mon 2:04:28 PM

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009

Page 4: AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... · Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry

Slide Nr. 4 of 13 Slides

Cooling with Dehumidification

Mon 2:04:28 PM

La

ten

t H

ea

t

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009

xSensible Heat

La

ten

t H

ea

t

loadheatTotal

loadheatSensible

hh

hh

21

2x =−

Page 5: AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... · Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry

Slide Nr. 5 of 13 Slides

Evaporative Cooling

Mon 2:04:28 PM

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009

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Slide Nr. 6 of 13 Slides

Adiabatic Mixing of Airstreams

Mon 2:20:10 PM

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009

Page 7: AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... · Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry

Slide Nr. 7 of 13 Slides

Adiabatic Mixing of Airstreams

Mon 2:20:10 PM

1a

123 m

1

hhh

&+

+=

1a

123 m

1&

+

ω+ω=ω

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009

2a

1a

m

m1

&

&+

2a

1a

m

m1

&

&+

Page 8: AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... · Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry

Slide Nr. 8 of 13 Slides

Summer Air Conditioning

Mon 2:20:10 PM

23

43

23

43

hh

hhr

ω−ω

ω−ω=

−=

r is the mass flow of dry recirculated air per unit mass flow of dry air supplied to the room.

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009

A4Line

A5LinefactorbypassCoil

−=

A4Line

54LinefactorContact

−=

Page 9: AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... · Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry

Slide Nr. 9 of 13 Slides

Winter Air Conditioning

Mon 2:20:10 PM

A5Line

65LineefficiencyWasher

−=

( )56as mm ω−ω= &&

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009

( )56ass hhmhm −= &&

( )( )56

56s

hhh

ω−ω

−=

Page 10: AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... · Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry

Slide Nr. 10 of 13 Slides

Cooling Towers

Mon 2:20:10 PM

Induced-draft counter flow cooling tower

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009

Packing

Page 11: AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... · Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry

Slide Nr. 11 of 13 Slides

Cooling Towers

Mon 2:20:10 PM

Natural-draft cooling tower

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009

Page 12: AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... · Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry

Slide Nr. 12 of 13 SlidesMon 2:20:10 PM

Example 15.5:

Pg @ 30°C=0.0424 bar

ωωωω3333 = 0.01086

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009

Page 13: AIR-CONDITIONING PROCESSESaast-notes.weebly.com/uploads/3/9/0/5/3905160/thermodynamicsii... · Slide Nr. 1 of 13 Slides AIR-CONDITIONING PROCESSES Mon 2:04:28 PM Chapter 2: Psychrometry

Slide Nr. 13 of 13 SlidesThu 8:46:56 AM

Chapter 2:

Psychrometry and Air-Conditioning

Dr. Eng. Sameh Shaaban

5 December 2009