Bock CO2 Compressors

GEA Refrigeration Technologies

Semi-hermetic Compressors for the Refrigerant R744

Bock CO2 Compressors

GEA Refrigeration TechnologiesBock CO2 Compressors

Overview

CO2 Compressors subcritical 1

CO2 Compressors transcritical2

Service – Made by GEA Bock • 3


Introduction

Especially suited to supermarket refrigeration applications and industrial refrigeration

Max. permissible operating pressure:- 55 bar (high pressure side)- 40 bar (low pressure side)

Coordination with CO2:- Motor design

- Individual mechanism adjustments

- Modifications in the valve and seal areas

Operational safety and economic spare part storage

CO2 Compressors subcritical


The refrigerant CO2 = R744

Colourless gas which liquefies under pressure

Slightly acidic smell and taste

No ozone depletion potential (ODP=0)

Negligible direct effect on global warming (GWP=1)

Not combustible, chemically inactive,

heavier than air

Available naturally in large quantities


… 4 model sizes with 15 capacity stages from 2,8 to 48,2 m3/h (50 Hz)

The current program …

HGX12P CO2 HGX22P CO2 HGX4 CO2

HGX34P CO2

DISPLACEMENT


At a glance

Valve plate construction for safe operation

• Valve design, tried and trusted all over the world, with onesided fixed finger reed valves, suction and pressure side

• Valve made out of high quality, impact resistant spring steel

Wear-resistant durable driving gear

• Solid construction and design

• Low friction sleeve bearings

• Aluminium piston with two ring assembly


Quiet with low vibrations

At a glance

Oil

•Compressors are equipped with Bock C85E

•Synthetic ester oil with high thermal load resistance

•Special additive protection against wear

Large dimensioned crankshaft area

Dynamic mass balance

High volume pressure area to dampen pulsations

4 cylinder construction from 19 m3/h


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


At a glance

Oil sump heater• Standard in HGX4

Oil sump heater• Standard in HGX12P, HGX22P and HGX34P


At a glance

Economic capacity control

• Continuously, variable speed control using Bock EFC

• Optional for HGX12P, HGX22P and HGX34P

• Up to 25 % lower energy consumption

Thermal protection thermostat

• Pressure gas temperature monitoring

• PTC sensor direct connection to the Bock MP10 motor protection


At a glance

Start unloader using Bock ESS (option)

• Electronic Soft Start

• Optional for HGX22P and HGX34P

• Soft compressor start from zero to nominal speed, time controlled and monitored

• No standard unloaded start required

Bock MP10 electronic motor protection (standard)

• Temperature monitoring with PTC sensors and optical status indication

• Discharge gas temperature sensor (option)


Overview


CO2 Compressors transcritical 2

Service – Made by GEA Bock• 3



Colourless gas which liquefies under pressure

Slightly acidic smell and taste

No ozone depletion potential (ODP=0)

Negligible direct effect on global warming (GWP=1)

Not combustible, chemically inactive,

heavier than air

Available naturally in large quantities


Important information

Transcritical CO2-applications are still in the development phase

Compressors can only be made available for selected projects

Operation and warranties are subject to a separate

agreement


The applications are not a general solution for the substitution of F-gases


Special features

Wear-resistant, long-life mechanism

Good operational characteristics

Reliable and safe oil supply through pump

lubrication

High-strength special cast-iron housing


Special features

Suction and discharge connections using

compression joints for steel pipes (without

shut-off valves)

Decompression valves for the suction and

discharge area

Electrical connection box to IP54 with Bock MP10 motor protection

Appropriately sized drive motors


… 2 model sizes with 10 capacity stages from 6,2 to 20,1 m3/h (50 Hz)

The current program …

HGX(HAX)2 CO2T HGX34 CO2T

DISPLACEMENT


1 = Oil supply of bearings

2 = Low oil throw

5 = High-strength spheroidal cast iron housing

Bock HG34 CO2T

14 = Oil sump heater installed ex works as standard

3 = Calmed oil level

4 = Prevention against oil overfilling

11 = Thermal separations on the cylinder cover and in the compressor housing

8 = Hard chromium plated piston rings in triple assembly

6 = Crankshaft with Massive main bearing and optimised mass balance

10 = Piston heads with grooving of the suction reed valves outline

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


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 the so-called optimal high pressure

the greatest possible enthalpy difference at the evaporator and the lowest possible power consumption of the compressor should be reached

• tga = Gas cooler outlet temperature

• Limit conditions: isentrope compression

• Evaporating pressure = 40 bar with internal heat exchanger

tga=35°C

tga=40°C

tga=45°C

tga=50°C


Overview


CO2 Compressors transcritical 2

Service – Made by GEA Bock 3


For additional questions or advice, please contact our training director:

Peter Spies

Telephone: +49 70 22 / 94 54 157

Fax: + 49 70 22 / 94 54 137

Email: [email protected]

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GEA Bock Practitioners‘

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needs

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director

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• 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.)


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Bock CO2 Compressors