22
The Cool Earth Project Chan Diu, Evan Tan and Hui Tong Chua 24/07/18
The Cool Earth ProjectChan Diu, Evan Tan and Hui Tong Chua
24/07/18
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
9-10 10-11 11-12 12-13 13-14 14-15 15-16 16-17 17-18 18-19 19-20
COP
Outdoor Temperature (°C)
Heating COP Comparison
Geo Control
0%
20%
40%
60%
80%
100%
120%
10-11 11-12 12-13 13-14 14-15 15-16 16-17 17-18 18-19 19-200
20
40
60
80
100
120
% C
OP
Incr
ease
Outdoor Temperature (°C)
Freq
uenc
y
Heating - % Increase in Performance of GSHP over ASHP
Geo Control % Increase
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
26-27 27-28 28-29 29-30 30-31 31-32 32-33 33-34 34-35 35-36 36-37 37-38
COP
Outdoor Temperature(°C)
Cooling COP Comparison
Geo Control
0%
40%
80%
120%
160%
200%
26-27 27-28 28-29 29-30 30-31 31-32 32-33 33-34 34-35 35-36 36-37 37-380
10
20
30
40
50
60
70
80
90
100%
CO
P In
crea
se
Outdoor Temperature(°C)
Freq
uenc
y
Cooling - % Increase in Performance of GSHP over ASHP
Geo Control % Increase
6
7
8
9
10
11
18 19 20 21 22 23 24 25 26 27 28
Abso
lute
Hum
idity
(g/k
g)
Dry Bulb Temperature (°C)
Heating FCU In Psychrometric Plot
Geo FCU in Control FCU in
5
6
7
8
9
10
11
12
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
Abso
lute
Hum
idity
(g/k
g)
Dry Bulb Temperature (°C)
Heating FCU Out Psychrometric Plot
Geo FCU out Control FCU out
0.7
0.75
0.8
0.85
0.9
0.95
1
10 12 14 16 18 20 22 24
Volu
met
ric E
ffic
ienc
y
Outdoor Temperature(°C)
Heating Volumetric Efficiency Comparison
Geo Ctrl
0
0.2
0.4
0.6
0.8
1
1.2
5 7 9 11 13 15 17
Isen
trop
ic E
ffic
ienc
y
Outdoor Temperature(°C)
Heating Isentropic Efficiency Comparison
Geo Ctrl
6
7
8
9
10
11
12
13
22 23 24 25 26 27 28 29 30
Abso
lute
Hum
idity
(g/k
g)
Dry Bulb Temperature (°C)
Cooling FCU In Psychrometric Plot
Geo FCU in Control FCU in
5.5
6.5
7.5
8.5
9.5
10.5
8 9 10 11 12 13 14 15 16 17 18 19 20
Abso
lute
Hum
idity
(g/k
g)
Dry Bulb Temperature (°C)
Cooling FCU Out Psychrometric Plot
Geo FCU out Control FCU out
0.7
0.75
0.8
0.85
0.9
0.95
1
20 22 24 26 28 30 32 34 36 38 40
Volu
met
ric E
ffic
ienc
y
Outdoor Temperature(°C)
Cooling Volumetric Efficiency Comparison
Geo Ctrl
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
7 9 11 13 15 17 19 21 23 25
Isen
trop
ic E
ffic
ienc
y
Outdoor Temperature(°C)
Cooling Isentropic Efficiency comparison
Geo Ctrl
10
15
20
25
30
35
22/09/2017 11/11/2017 31/12/2017 19/02/2018 10/04/2018 30/05/2018 19/07/2018
Tem
pera
ture
(°C
)Bore Water Temperature
LWT- Cooling EWT-Cooling EWT-Bore LWT-Bore EWT-Heating LWT-Heating EWT-Bore LWT-Bore
• Cooling efficiency gain of GSHP compared with ASHP can be up to 100% depending on outdoor temperature.
• Heating efficiency gain of GSHP compared with ASHP can be up to 60% depending on outdoor temperature.
• Cash savings up to $950 per annum per household.
Conclusions
