10.07.2015   EUROSUN 2008

Discharging the Ice Store

Complete external discharging takes about 5 to 9 hours, depending on discharging temperature and discharging flow. Choosing a flow temperature of 20°C, discharging is possible at an average of 3 kW. At the end there were no significant differences detected between the two types of heat exchangers (Figure 6).

2.2

System A

System B

Discharging

Temperature

[°C]

20

22

24

Internal

20

20

22

24

Internal

20

Average Mass Flow

[kg/s]

0,319

0,319

0,319

0,252

0,319

0,319

0,319

0,270

Average Mass Flow in Store

[kg/s]

0,084

0,95

0,104

—

0,085

**

**

—

Average Discharging Rate

[kW]

3,33

4,11

4,99

4,34

3,34

**

**

2,47

Effective Capacity

[kWh

]_

28,55

28,81

28,01

27,33

26,86

**

**

29,23

Period of Discharging

[min]

514

420

337

370

482

**

**

710
Подпись: System A System B Discharging Temperature [°C] 20 22 24 Internal 20 20 22 24 Internal 20 Average Mass Flow [kg/s] 0,319 0,319 0,319 0,252 0,319 0,319 0,319 0,270 Average Mass Flow in Store [kg/s] 0,084 0,95 0,104 - 0,085 ** ** - Average Discharging Rate [kW] 3,33 4,11 4,99 4,34 3,34 ** ** 2,47 Effective Capacity [kWh ]_ 28,55 28,81 28,01 27,33 26,86 ** ** 29,23 Period of Discharging [min] 514 420 337 370 482 ** ** 710

Heat losses

No significant losses of cooling energy were measured. At an ambient Temperature of 23°C, loss of cooling energy in 24 hours is about 1 kWh. This means an average rate of loss of about 42 W.