Page 140 - Low Temperature Energy Systems with Applications of Renewable Energy
P. 140
Effective use of heat pumps for various heating applications 129
pumpswiththreedifferentmeansofpoweringtheheatpumpcompressor,namely,electric,
diesel or gas turbine. The heat pump with a gas turbine compressor drive is the most effi-
cient on several thermodynamic and practical measures. An absorption heat pump is
shown to be the most effective kind of heat pump.
Nomenclature
B consumption
COP coefficient of performance
d humidity
Q energy discharged
T temperature
V velocity
W consumption
Greek letters
b load
h efficiency
r density
Subscripts
4GDH fourth generation district heating
ABHP absorption heat pump
GHG greenhouse gas
HP heat pump
MC mixed chamber
F filter
HDD heating degree days
HPU heat pump unit
LHV lower heating value
L heat pump driver
rec recirculation
recup recuperation
WLHPS water loop heat pump system
WB water boiler
GT gas turbine
VCHP vapor compression heat pump
Review questions
1. Why is the efficiency of using the HP higher in buildings with a “warm floor” type heating?
2. In which cases is the HP more efficient when using a heating boiler (consider the efficiency
value)?
