ZEMCH 2015 - International Conference Proceedings | Page 695

Focusing on June, the simulation has shown instantaneous power gains deriving from the hot
storage tank (Tank_P), from the auxiliary heater (Boil_P) and those required by the chiller’s unit
(HOT_P), for each hour in which the conditioning signal is switched on.
Table 2 Water based solar collectors – Instantaneous power gains on June

JUNE

WATER

Tank_P

BOIL_P

Tank_P+BOIL_P

HOT_P

Day

Hour

kW

kW

kW

kW

18

15:00:00

6.07

0.93

7.00

6.78

19

10:08:00

5.74

1.37

7.11

6.72

19

11:08:00

5.58

1.37

6.95

6.72

19

12:08:00

5.43

1.37

6.80

6.40

20

17:04:00

5.63

1.55

7.18

6.77

20

18:04:00

5.47

1.55

7.02

6.77

21

10:08:00

5.20

2.08

7.28

6.17

24

17:04:00

5.35

1.87

7.22

6.78

24

18:04:00

5.20

1.87

7.07

6.78

25

10:08:00

4.94

2.42

7.36

6.10

Table 3 Nanofluid based solar collectors – Instantaneous power gains on June

NANOFLUID
Day

JUNE

Hour

Tank_P

BOIL_P

Tank_P+BOIL_P

HOT_P

kW

kW

kW

kW

18

15:00:00

6.22

0.76

6.97

6.78

19

10:08:00

5.88

1.19

7.07

6.72

19

11:08:00

5.72

1.19

6.90

6.72

19

12:08:00

5.56

1.19

6.75

6.40

20

17:04:00

6.11

0.90

7.01

6.77

20

18:04:00

5.93

0.90

6.83

6.77

21

10:08:00

5.71

1.53

7.25

6.17

24

17:04:00

5.94

1.12

7.05

6.78

24

18:04:00

5.77

1.12

6.88

6.78

25

10:08:00

5.47

1.73

7.20

6.10

Figures 4.10 and 4.11 show histograms about energy demand and supply in both cases:

Figures 4.10 Water based solar collectors – Hot storage fluid stream supplied energy (TANK_En); Auxiliary heater supplied energy (BOIL_En); Chiller’s generator required energy (HOT_En)

Dynamic simulation of a solar cooling HVAC system with nanofluid

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