Ejector Cycle(PDF:124KB)
Ejector Cycle(PDF:124KB)
Ejector Cycle(PDF:124KB)
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>Ejector</strong> <strong>Cycle</strong><br />
BENEFIT<br />
Refrigerant cycle for improvement of the coefficient of performance and saving energy<br />
DENSO developed the ejector cycle as a new refrigeration cycle.<br />
Freezer Unit<br />
<strong>Ejector</strong><br />
Compressor<br />
The world’s first ejector cycle developed by DENSO,<br />
raises the coefficient of refrigerator and air conditioner<br />
performance, resulting in significant energy sav ings.
<strong>Ejector</strong> <strong>Cycle</strong><br />
COP improvement rate (%)<br />
60<br />
40<br />
20<br />
0<br />
COP * improvement by ejector cycle<br />
Comparison based on the<br />
same refrigeration capability<br />
+40%<br />
+50%<br />
-30 -18<br />
Temperature in freezer deg C<br />
0<br />
+65%<br />
BENEFIT<br />
Refrigerant cycle for improvement of the coefficient of performance and saving energy<br />
* Coefficient of performance
<strong>Ejector</strong> <strong>Cycle</strong><br />
What’s an ejector cycle ?<br />
《 Conventional refrigeration cycle 》<br />
Evaporator<br />
Condenser<br />
Compressor<br />
TECHNOLOGY<br />
Refrigerant cycle for improvement of the coefficient of performance and saving energy<br />
Expansion<br />
Valve<br />
<strong>Ejector</strong> draws<br />
in refrigerant.<br />
《 <strong>Ejector</strong> cycle 》<br />
<strong>Ejector</strong><br />
Evaporator<br />
Compressor<br />
Gas-liquid<br />
Separator<br />
The ejector is used instead of an expansion valve.<br />
In the ejector cycle, the ejector has two functions: expansion of the liquid refrigerant, and pump-like circulation of<br />
the refrigerant.<br />
The ejector has the following advantages compared to the expansion valve.<br />
1. Can use energy, w hich is dissipated as sw irl in the expansion valve.<br />
2. Can reduce work of the compressor, since the ejector also works as a pump.<br />
In a conventional refrigeration cycle, only the compressor circulates refrigerant. The ejector saves fuel or<br />
electricity for operating the compressor.
Drive<br />
Flow<br />
<strong>Ejector</strong> <strong>Cycle</strong><br />
Nozzle<br />
Diffuser<br />
TECHNOLOGY<br />
Refrigerant cycle for improvement of the coefficient of performance and saving energy<br />
Principle of the ejector<br />
<strong>Ejector</strong> works as a pump without operating power<br />
Secondary flow<br />
from evaporator<br />
H igh velocity and low<br />
pressure refrigerant flow<br />
at the nozzle outlet<br />
Mixing Section<br />
Pressure recovery<br />
due to decreased<br />
flow velocity
<strong>Ejector</strong> <strong>Cycle</strong><br />
Principle of the COP increase by ejector cycle<br />
《 <strong>Ejector</strong> cycle 》<br />
<strong>Ejector</strong><br />
TECHNOLOGY<br />
Refrigerant cycle for improvement of the coefficient of performance and saving energy<br />
Using energy previously<br />
Using energy previously<br />
lost by expansion in<br />
lost by expansion in<br />
conventional cycle<br />
conventional cycle<br />
Higher<br />
Higher<br />
pressure<br />
pressure<br />
at<br />
at<br />
the<br />
the<br />
inlet<br />
inlet<br />
of<br />
of<br />
the<br />
the<br />
compressor<br />
compressor<br />
→Low<br />
→Low<br />
er<br />
er<br />
compression<br />
compression<br />
ratio<br />
ratio<br />
of<br />
of<br />
the<br />
the<br />
compressor<br />
compressor<br />
Only liquid refrigera nt<br />
Only liquid refrigera nt<br />
flows into the evaporator<br />
flows into the evaporator<br />
《 Breakdown of COP increase 》<br />
Compression ratio lower<br />
Compression efficiency higher<br />
Only liquid refrigerant flows<br />
into the evaporator<br />
Pressure loss decrease<br />
Efficiency increase by ejector<br />
・Low er pow er for compressor operation<br />
・Higher heat exchange efficiency<br />
of evaporator
Change language