Lecture Objectives:

1
Lecture Objectives

• Aabsorption cooling cycles

2
Absorption cooling cycle
Rich solution of
Heat
H2O NH3
H2O
H2O
Rich solution of
H2O NH3
3
Simple absorption system
3V
3L
3LLP
4
Simple absorption system
Saturated vapor at p2p3p4
3V
6
3
5V
mixing
1
Needed thermal energy
Useful cooling energy
4
3L
5
3LLP
2
Saturated liquid at p2p3p4
Saturated liquid at p1p5p6p3_LLP
1
5L
5
Heat transfer with separation into liquid and
vapor (Generator)
How to move point 4 to right ?
2V
2V
heating
m4
Q12 /m1
2L
2L
m2
m1
m2
mixture
Separator
mixture
sub cooled liquid
x1
x1
m3
Q12
m3
Q12
6
Heat rejection with separation into liquid and
vapor (Enrichment NH3 in the vapor mixture)
This is our point
cooling
1
42V
Separator
65V
Q12 /m1
cooling
Q45 /m4
x8
m8
8
7
m1
m2
5
2
mixture
sub cooled liquid
isotherm
m3
2L
Q12
x8
x1
7
Simple absorption system
Generator with of Enrichment NH3
Different
8V
8L
9
10
8LLP
11
8
Absorption system with
Saturated vapor at p2p3p4
3V
8V
mixing
3
11
8L
1
Useful cooling energy
8LLP
10
2
3L
9
Saturated liquid at p2p3p4
Saturated liquid at p1p5p6p3_LLP
1
9
More detailed absorption cooling
Refrigeration and air conditioning (Ramesh et al)
10
Carnot Cycle

• COPvapor_compressionQcooling/Pelectric
  COPmaxTcooling/(Tenviromnet-Tcooling)
  
• COPabsorptionQcooling/Qheating COPmax
  Tcooling/Theat_source (Theat_source-T
  environment)/(Tenviromnet-Tcooling)