MOCS
PBL-7-98
Chemical Heat Pump
Mike Hobbs
Mike Steele
Mike McGann
Scott Daniels
James Linder
Topics of Discussion
Problem Statement
Given
Required
Solutions
Problem Statement
Analysis of Chemical Heat Pump
Analysis of Cooling Tower
Analysis of Boiler
Exit air
MOCS
WORKING DIAGRAM
PBL-7-98
CWR 103  F
Cooling
tower
Ambient air
85 F
80 % RH
COOLING TOWER
Pump 3
WATER
MIXED
H2
Acetone
2-Propanol
CWS 75  F
Flash tank
H2
Compressor 1
condenser
Pump 1
Acetone
Acetone
2-prop
endo
reactor
Distillation column
Hot air
Heat exchanger
Cool air
Exothermic
reactor
gas
2- prop & acetone
reboiler
Reduction valve
H2
Pump 2
water
BOILER
Compressor 2
BFW
Liquid
CR
Combustion gasses
CO2, H2O, N2, O2
T= 375  F
Natural gas
SS
Air 79 % N2
21 % O2
Flash tank
Given: Chemical Heat Pump
Diameter of L1 = 6.35 mm
Average Velocity = 10 m/sec
Temperature L6 = 200  C
Mole composition of L1= .97 2-Propanol
Mole composition of L5= .02 2-Propanol
Given: Chemical Heat Pump (continued)
Hot Air going into Endo 23.8  C
Relative Humidity 80 %
Cool Air coming out of Endo 15.5  C
Required: Chemical Heat Pump
Energy Supplied into Endo Reactor (Qin)
Diameter of L6
Partial Pressures of L6
Amount of Water Condensed in Endo
Endo Reactor
L 202
Acetone
2-Prop
Next
page
H2
Flash Tank 1
L2
L3
Q in
L5
Condenser
Distillation
L4
Column
L 201
Acetone
2- Prop
Hot air
L 303
CWR
L 803
Cool air
L 101
Water
L1
Pump 2
Re-boiler
Reduction
valve
L 801
Analysis: Chemical Heat Pump (Endo)
Qin = 353000 Btu/ hr (29 ton unit)
Water Condensed 168 lb/hr (21 gal/hr)
Exothermic Reactor
Compressor 1
H2
L 202
L5
L 203
H2
Pump 1
L6
Acetone
L 501
Acetone
2-Propanol
L8
Exo
L 7 Reactor
Heat Exchanger
L 802
Gas
H2
L 801
Flash Tank 2
L 804
Compressor 2
Analysis: Exothermic Reactor
Diameter of L6 = 29.0 mm
Partial Pressure: 1.96 ATM Acetone
0.04 ATM 2-Propanol
Given: Cooling Tower
Cold Water Return 39.4 C
Cold Water Supply 23.8 C
Input Ambient Air 29.4 C
Relative Humidity 80 % (Ambient Air)
Exit Air 30.5 C
RH 90 %
Given: Cooling Tower (continued)
Diameter for CWS and CWR: 0.05 m
Cooling Tower
Exit Air
L 301
CWR
103 F
Cooling
Tower
Ambient Air
85 F
80 % RH
L 302
Pump 3
Water
CWS 75 F
L 303
Required: Cooling Tower
Velocity for Cold Water Supply
Velocity for Cold Water Return
Pounds of Dry Air from Cooling Tower
Analysis: Cooling Tower
Velocity of Cold Water Supply: 1418.0 m/hr
Velocity of Cold Water Return: 1425.0 m/hr
Pounds of Dry Air: 34,600 lb dry air/ hr
Given: Boiler
Steam Supply 220 psig (q=1)
Cold Return (q=0)
Temperature of Exit Gas 190.5 C
Combustion Gasses: CO2, H2O, N2, O2
Excess Air 40 %
Given: Boiler (continued)
Diameter for SS and CR: .05 m
Boiler
L 903
L 901
T= 375F
Combustion
Gasses
CO2,H20,
N2,O2
Boiler
Boiler Feed Water
CR
L 902
Natural Gas
SS
Air
79 % N2
21 % O2
Required: Boiler
Velocity of Steam Supply
Velocity of Cold Return
Flow Rate of Natural Gas
Percent Composition of Exit Gasses
Analysis: Boiler
Velocity Steam Supply: 3960.0 m/hr
Velocity Cold Return: 36.7 m/hr
Amount of Natural Gas: 3.51 tons/month
Analysis: Boiler (continued)
Composition of Flue Gasses:
CO2 = 7.0 %
H20 = 13.9 %
O2 = 5.6 %
N2 = 73.5 %
Questions