Structural Design of the mCCHP-RES System - Design for Micro-Combined Cooling, Heating and Power Systems - page 201

System structural components

Storages

Suppliers Consumers

Current
power potential

Power grid

Power
outlet Appliance

Max

Home
appliance

Solar
light
radiation

powering

Min

PV
panel

Power
consumption

Power
Storage

Space

Power
load

MCC

Cooling

CHP
unit • Biomass

storage

Current
heat potential

Space

• Gas

grid

Max
Min

Radiator

heating

Boiler

Heat
consumption

Solar
thermal
radiation

DHW

STpanel

Heat
load

Heat
Storage

Heat grid Heat

valve

Domestic
facilities

Facilities

supplying

Suppliers
load

System
consumption

Consumers
consumption

System
load

Load diagrams Consumption diagrams

Fig. 22 Structural model of the CCHP system with MCC

The relations for determining the energy consumption of the system in the case
of cooling with mechanical compression chillers are as follows:

q sys ¼ q þ q DHW ð 55 Þ

q c
COP

e sys ¼ e þ ð 56 Þ

c consumption for
a mCCHP system, located in Galati area, are recorded in the Table 31 (when
COP = 3). These values are obtained by applying the relations 55 and 56 to the data
given in the Table 30 .
The diagrams of the mCCHP system power and heat loads in the case of cooling
with mechanical compression chillers are presented in Fig. 23 .
What may be observed is that the power consumption and heat consumption of
the mCCHP system are not uniform during the whole year. In the case of systems
with a mechanical compression chiller, the power consumption is low during the
cold season and high during the hot season. The heat consumption of the mCCHP
system is low during the hot season and very high during the cold season.

For example, the monthly values of the heat and power-speci