Decentralized Poly-generation of Energy: Basic Concepts - Design for Micro-Combined Cooling, Heating and Power Systems - page 49

(a)

(b)

E

E CHP

PM EG

E

PM EG

E c =C/COP

C

C/COP

Thermal
chiller

C

Compresion
chiller

Q

Q

MCP PC

Q hw

Q hw

MCP PC

Boiler

Boiler

Fig. 7 Trigeneration processes

(a)

Heat loss

(b)

Heat loss

Electricity

Electricity

Cold

CCHP CCHP

Fuel Fuel

Heat Cold

Heat

Line losses Line losses

Fig. 8 Energy balance of trigeneration processes

first version presupposes transforming heat into cold (thermally activated
chiller) and the second presupposes obtaining cold by transforming electric energy
(mechanical compression chiller). The energy balance related to these two trigen-
eration processes is given in Fig. 8 .
A standard mode of achieving CCHP system does not exist but, generically,
such a system consists of a cogeneration unit CHP (Fig. 9 ), a refrigerating device
(a Thermal Driven Chiller

The

— TDC or a Mechanical Compression Chiller — MCC),

heat storage unit (hot water storage — HW), and electricity storage unit.

Consumptions

mCCHP

Electricity
storage

Electricity

Fuel

CC

mCHP

Cold

TDC

Heat
storage

Heat

HW

Fig. 9 Trigeneration system