Information about semi-hermetic compressors for the refrigerant R744: CO2 compressors subcritical and CO2 compressors transcritical. CO2 as a natural refrigerant (negligible direct effect on global warming, no ozone depletion potential, available naturally in large quantities, chemically inactive ...).

1. Bock CO2 Compressors
Semi-hermetic Compressors for the Refrigerant
R744
GEA Refrigeration Technologies

2. Overview
1 CO2 Compressors subcritical
2 CO2 Compressors transcritical
•3 Service – Made by GEA Bock
Bock CO2 Compressors GEA Refrigeration Technologies

3. Introduction
Especially suited to supermarket refrigeration applications and
industrial refrigeration
Coordination with CO2: CO2 Compressors subcritical
- Motor design
- Individual mechanism Operational safety and
adjustments economic spare part storage
- Modifications in the valve
and seal areas
Max. permissible operating pressure:
- 55 bar (high pressure side)
- 40 bar (low pressure side)
Bock CO2 Compressors GEA Refrigeration Technologies

4. The refrigerant CO2 = R744
Colourless gas which Slightly acidic smell and No ozone depletion
liquefies under pressure taste potential (ODP=0)
Not combustible,
Negligible direct effect on Available naturally in large
chemically inactive,
global warming (GWP=1) quantities
heavier than air
Bock CO2 Compressors GEA Refrigeration Technologies

5. The current program …
… 4 model sizes with 15 capacity stages from 2,8 to 48,2 m3/h (50 Hz)
D
I
S
P
L
A
C
E
M
E
N
T
HGX12P CO2 HGX22P CO2 HGX4 CO2
HGX34P CO2
Bock CO2 Compressors GEA Refrigeration Technologies

6. At a glance
Wear-resistant durable driving gear Valve plate construction for safe
operation
• Solid construction and design
• Valve design, tried and trusted all over the
• Low friction sleeve bearings world, with onesided fixed finger reed
valves, suction and pressure side
• Aluminium piston with two ring assembly
• Valve made out of high quality, impact
resistant spring steel
Bock CO2 Compressors GEA Refrigeration Technologies

7. At a glance
Quiet with low vibrations
• Large dimensioned crankshaft area • High volume pressure area to dampen
pulsations
• Dynamic mass balance
• 4 cylinder construction from 19 m3/h
Oil
• Compressors are equipped with Bock
C85E
• Synthetic ester oil with high thermal load
resistance
• Special additive  protection against
wear
Bock CO2 Compressors GEA Refrigeration Technologies

8. At a glance
Reliable and safe oil supply
• Classic lubricant circuit with an oil pump
independent of the rotating direction
• High volume oil sump
• Special oil charge for CO2:
Bock C85E
Bock CO2 Compressors GEA Refrigeration Technologies

9. At a glance
Oil sump heater Oil sump heater
• Standard in HGX12P, HGX22P and HGX34P • Standard in HGX4
Bock CO2 Compressors GEA Refrigeration Technologies

10. At a glance
Thermal protection thermostat Economic capacity control
• Pressure gas temperature monitoring • Continuously, variable speed control using
Bock EFC
• PTC sensor direct connection to the Bock
MP10 motor protection • Optional for HGX12P, HGX22P and
HGX34P
• Up to 25 % lower energy consumption
Bock CO2 Compressors GEA Refrigeration Technologies

11. At a glance
Bock MP10 electronic motor Start unloader using Bock ESS (option)
protection (standard)
• Electronic Soft Start
• Temperature monitoring with PTC sensors • Optional for HGX22P and HGX34P
and optical status indication • Soft compressor start from zero to nominal
• Discharge gas temperature sensor (option) speed, time controlled and monitored
• No standard unloaded start required
Bock CO2 Compressors GEA Refrigeration Technologies

12. Overview
1 CO2 Compressors subcritical
2 CO2 Compressors transcritical
•3 Service – Made by GEA Bock
Bock CO2 Compressors GEA Refrigeration Technologies

13. The refrigerant CO2 = R744
Colourless gas which Slightly acidic smell and No ozone depletion
liquefies under pressure taste potential (ODP=0)
Not combustible,
Negligible direct effect on Available naturally in large
chemically inactive,
global warming (GWP=1) quantities
heavier than air
Bock CO2 Compressors GEA Refrigeration Technologies

14. Important information
Transcritical CO2-applications are still in
the development phase
Operation and warranties are The applications are not a
The refrigerant
subject to a separate general solution for the
CO2 = R744
agreement substitution of F-gases
Compressors can only be made available
for selected projects
Bock CO2 Compressors GEA Refrigeration Technologies

15. Special features
High-strength special
cast-iron housing
Good operational Wear-resistant, long-life
characteristics mechanism
Reliable and safe oil
supply through pump
lubrication
Bock CO2 Compressors GEA Refrigeration Technologies

16. Special features
Appropriately sized
drive motors
Suction and discharge
Decompression valves connections using
for the suction and compression joints for
discharge area steel pipes (without
shut-off valves)
Electrical connection
box to IP54 with Bock
MP10 motor protection
Bock CO2 Compressors GEA Refrigeration Technologies

17. The current program …
… 2 model sizes with 10 capacity stages from 6,2 to 20,1 m3/h (50 Hz)
D
I
S
P
L
A
C
E
M
E
N
T
HGX(HAX)2 CO2T HGX34 CO2T
Bock CO2 Compressors GEA Refrigeration Technologies

18. Bock HG34 CO2T
11 = Thermal separations on the cylinder cover and in the compressor housing
8 = Hard chromium plated piston rings in triple assembly
6 = Crankshaft with 10 = Piston heads with
Massive main bearing grooving of the suction
and optimised mass reed valves outline
balance 7 = Weight-optimized
connecting rod
9 = Hardened pistons
with anti-friction coating at
the piston skirt
12 = Valve system with
optimized flow and
channels in the housing
13 = Thermal protection
thermostat installed ex
works as standard
14 = Oil sump heater installed ex works as standard 1 = Oil supply of bearings
3 = Calmed oil level 2 = Low oil throw
4 = Prevention against oil overfilling 5 = High-strength spheroidal cast iron housing
Bock CO2 Compressors GEA Refrigeration Technologies

19. Special features CO2 transcritical
• Transcritical operating conditions
occur at higher temperatures at the
heat exchanger
 the refrigerant CO2 can no longer
be condensed
• Regulation of the high pressure at tga=35°C tga=45°C
the so-called optimal high pressure tga=40°C tga=50°C
 the greatest possible enthalpy
difference at the evaporator and the • tga = Gas cooler outlet temperature
lowest possible power consumption • Limit conditions: isentrope
of the compressor should be compression
reached
• Evaporating pressure = 40 bar with
internal heat exchanger
Bock CO2 Compressors GEA Refrigeration Technologies

20. Overview
1 CO2 Compressors subcritical
2 CO2 Compressors transcritical
3 Service – Made by GEA Bock
Bock CO2 Compressors GEA Refrigeration Technologies

21. Training and workshops on compressors
• Training events offered:
GEA Bock Training tailored
Practitioners‘ to your individual
Workshop needs
Training for your Training on your
entire stuff premises
• Characteristics of all trainings: For additional questions or advice, please
contact our training director:
Captivating way
Strong practice
of the training
orientation
director Peter Spies
Telephone: +49 70 22 / 94 54 157
Free service Fax: + 49 70 22 / 94 54 137
Email: Peter.Spies@gea.com
Bock CO2 Compressors GEA Refrigeration Technologies

22. GEA Bock on the Internet – www.bock.de
Products Brochure
Data
Sales Contact persons
network Links to your trading partner
Company Information
Film & References
News Company
Products
Toolbocks Converter
Calculator
Wordbock App
Online version
Know- Error Analysis
How VAP
Bock CO2 Compressors GEA Refrigeration Technologies

23. GEA Bock – auch im Online-Bereich „bockstark“
Compressor Schulungs-
Videotraining Links Kälte-Quiz
Professionals unterlagen
Log-In Bereich auf Informationsdokumente Video-Clips zur Links zu Internetseiten, Quiz-Fragen aus dem
www.bock.de zu Themen aus dem korrekten Montage und Online-Foren, Bereich der Klima- und
Kälte- / Klimabereich Demontage von Veranstaltungen und Kältetechnik
 Registrierung
Verdichtern Messen
Bock CO2 Compressors GEA Refrigeration Technologies

24. After Sale Service
• GEA Bock offers you individual, personal consultation and assistance after the purchase as
well
• Outside our business hours, you can reach us on our free hotline: 00 800 / 800 000 88
(Monday to Saturday 8:00 a.m. to 9:00 p.m.)
Bock CO2 Compressors GEA Refrigeration Technologies

25. Quality by GEA Bock
Permanent optimisation of quality
Requirements of DIN EN ISO 9001:2008
(DQS)
Internal company standards
Bock CO2 Compressors GEA Refrigeration Technologies