Refrigeration System With Two-Stage Compression
Categories: Engineering Lab EquipmentRefrigeration systems with two-stage compression are used for the generation of particularly low temperatures. At very low temperatures large pressure differences are required between the evaporator...
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Description
Refrigeration systems with two-stage compression are used
for the generation of particularly low temperatures. At very low temperatures
large pressure differences are required between the evaporator and condenser.
In a compressor the volumetric efficiency drops significantly at high pressure
ratios.
Therefore, two compressors are connected in series, with
each compressor only having a relatively low pressure ratio. This makes a more
favourable dimensioning of the low pressure stage compressor possible. Due to
the large specific volume it requires a larger capacity at lower drive power.
In addition, intercooling between the low pressure
compressor (LP) and the high pressure compressor (HP) reduces the outlet
temperature of the HP compressor to harmless values and improves the efficiency
of the compression.
Learning Objectives/Experiments
Design and function of a refrigeration system with two-stage
compression and injection intercooling
Effect of the inlet temperature at the HP compressor on the
efficiency of the compression
With intercooling
Without intercooling
Effect of the additional refrigerant intercooling
Distribution of the compressor pressure ratios
Represent and understand the refrigeration cycle process in
the log p-h diagram
Specification
Refrigeration system with two-stage compression
Hermetic low and high pressure compressors
Adjustable intercooling via refrigerant injection
Heat exchange for additional supercooling of the liquid
refrigerant
Closed refrigeration chamber contains evaporator with fan
and adjustable electric heater as cooling load
Digital display for temperatures, drive power of the
compressors and cooling load power
Real-time representation of the process in the log p-h
diagram of the software
Technical Data
Low pressure compressor (LP)
power consumption: 275W at -10/55°C
refrigeration capacity: 583W at -10/55°C
High pressure compressor (HP)
power consumption: aprrox. 841W at -25/55°C
refrigeration capacity: 702W at -25/55°C
Refrigerant
R449A
GWP: 1397
filling volume: 1,29kg
CO2-equivalent: 1,8t
Measuring ranges
flow rate: 2…29L/h, 4…40L/h
pressure: 1x -1…15bar, 2x -1…24bar
temperature: 8x -75…125°C
power:
0…562W (heater)
0…750W (LP compressor)
0…2250W (HP compressor)
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase
230V, 60Hz, 3 phases
quick overview :
Refrigeration systems with two-stage compression are used
for the generation of particularly low temperatures. At very low temperatures
large pressure differences are required between the evaporator and condenser.
In a compressor the volumetric efficiency drops significantly at high pressure
ratios.
Therefore, two compressors are connected in series, with
each compressor only having a relatively low pressure ratio. This makes a more
favourable dimensioning of the low pressure stage compressor possible. Due to
the large specific volume it requires a larger capacity at lower drive power.
In addition, intercooling between the low pressure
compressor (LP) and the high pressure compressor (HP) reduces the outlet
temperature of the HP compressor to harmless values and improves the efficiency
of the compression.
Learning Objectives/Experiments
Design and function of a refrigeration system with two-stage
compression and injection intercooling
Effect of the inlet temperature at the HP compressor on the
efficiency of the compression
With intercooling
Without intercooling
Effect of the additional refrigerant intercooling
Distribution of the compressor pressure ratios
Represent and understand the refrigeration cycle process in
the log p-h diagram
Specification
Refrigeration system with two-stage compression
Hermetic low and high pressure compressors
Adjustable intercooling via refrigerant injection
Heat exchange for additional supercooling of the liquid
refrigerant
Closed refrigeration chamber contains evaporator with fan
and adjustable electric heater as cooling load
Digital display for temperatures, drive power of the
compressors and cooling load power
Real-time representation of the process in the log p-h
diagram of the software
Technical Data
Low pressure compressor (LP)
power consumption: 275W at -10/55°C
refrigeration capacity: 583W at -10/55°C
High pressure compressor (HP)
power consumption: aprrox. 841W at -25/55°C
refrigeration capacity: 702W at -25/55°C
Refrigerant
R449A
GWP: 1397
filling volume: 1,29kg
CO2-equivalent: 1,8t
Measuring ranges
flow rate: 2…29L/h, 4…40L/h
pressure: 1x -1…15bar, 2x -1…24bar
temperature: 8x -75…125°C
power:
0…562W (heater)
0…750W (LP compressor)
0…2250W (HP compressor)
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase
230V, 60Hz, 3 phases
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