Experimental Case Study - Design for Micro-Combined Cooling, Heating and Power Systems - page 377

Fig. 27 Total consumed
electrical power in Winter
Regime

Electrical power

6000

5000

4000

3000

2000

1000

0 0.5 1 1.5 2 2.5

x 10 5

Time [s]

Fig. 28 Pro le of the power
generated by PV panel

Electrical power

1.5

1

0.5

0

0 0.5 1 1.5 2 2.5

Time

x10 5

the consumption of the circulation pump of the thermal agent from the pellet
boiler to the hot water tank, and the consumption of the circulation pump for the
DHW are taken into account only when they start to operate;

the electric power of the PV source is that presented in Fig. 28 .

￿

Figure 29 presents the evolution of the battery voltage while the Fig. 30 presents
the energy accumulated in the battery. It can be noticed that, after a transient
regime, these evolutions practically indicate a permanent regime. That means the
electrical energy sources cover the consumption if there is (enough) energy accu-
mulated in the battery. Figure 31 shows the variation of the electrical power gen-
erated by Stirling engine. It can be noticed its continuous operating regime
according to the producer speci cations (no more than one stop per day is rec-

ommended). The ratio between the thermal and the electrical power of Stirling
engine is 3:1.

Fig. 29 Battery voltage
evolution in Winter Regime

Battery voltage

49

48.8

48.6

48.4

48.2

48

0 0.5 1 1.5 2 2.5

x 10 Time [s]