Functional Design of the mCCHP-RES System - Design for Micro-Combined Cooling, Heating and Power Systems - page 317

1
In1

T_c

1
s
Integrator

1/(c_w*m_apa)

1
Out1 2

In2

Gain

3
In3

Fig. 81 Scheme of the “ Thermal accumulator ” block in functional model 5

Most of time, the used blocks are identical to the ones presented in the previous
functional models. The new elements of the scheme are:

the block From le “ var 3, ” which provides the power generated by the PV

￿

source, having the pro le presented in Fig. 55 ;

the block From which gives the time evolution of the power

consumed by the air conditioning equipments, according to Fig. 79 .

le “ var 4, ”

￿

ed, compared to the previous
functional models; Fig. 81 presents the new scheme.
The following results in the electrical subsystem were obtained: Fig. 82 shows
the total power provided, Fig. 83 shows the total consumed power, and Fig. 84
shows the battery voltage evolution. It is noticed that, at the beginning of the
dynamic regime, the battery voltage is greater than the setpoint and the voltage
controller brings the power of the Stirling engine to 0. The PV source begins to
deliver energy after 6 h from the beginning of the dynamic regime, so that, in the
initial period of this regime, the total electrical power provided by the sources is
null and the battery discharges. In what follows, the voltage controller controls the
Stirling engine to deliver its maximum power, but the average of the total load is
superior to the average of the produced total power and the average power of the
battery voltage has a decreasing evolution. The main conclusion consists in the fact
that the system cannot operate in a permanent regime.

The “ thermal accumulator ” block was modi

Electrical power

6000

5000

4000

3000

2000

1000

0

0 0.5 1 1.5 2 2.5

x 10 5

Time [s]

Fig. 82 Total produced electrical power in summer regime, model 5