Page 137 - Low Temperature Energy Systems with Applications of Renewable Energy

126 Low-Temperature Energy Systems with Applications of Renewable Energy

Fig. 3.40 A simplified block diagram for an absorption heat pump heating system ABHPHS,
used in conjunction with a district heating system and an electric generating station.

Fig. 3.41 Simplified flow diagram for a CHP system augmented by ABHP.

In a single-stage ABHP, the COP ¼ Q s /Q g is 1.65e1.75, where Q s is the amount of
heat produced from the absorber and condenser and Q g is the amount of heat required
in the generator, and the relative energy consumption for heat production is 0.67e0.76.
In a 2-stage ABHP, the COP is 2.05e2.15, and the relative energy consumption for
heat production is 0.55e0.67. Specific fuel consumption for heat production in an
ABHP is 40e45% lower than in boilers. ABHPs are widely used in heating systems
in Japan, South Korea (share of ABHPs is 70%), China, India, Canada (up to 50%),
and Sweden. At the same time, secondary thermal energy resources in industrial plants
are effectively put to use.