Mostra Convegno Expocomfort, XVI EU Conference on "The Refrigerant Revolution , a 79% reduction" - Milan 20th March 2014

1. Open Drive Screw Compressors
Design Features
OS.53 .. OS.85
BITZER Kühlmaschinenbau GmbH

2. BITZER // S_OS_Features_GB // Page 2
Pressure
Vessels
Recip
Open
Drive
Semi-
Hermetic
Semi-hermetic
OSK / OSN / OSKB 53
OSK / OSN / OSKB 74
OSK / OSN / OSKB 85
OSKA / OSNA / OSKAB 53
OSKA / OSNA / OSKAB 74
OSKA / OSNA / OSKAB 85
Screw
Open Drive
“Units”
(Recips)
Condensing
Units
Open Drive
Oil Coolers
Oil Separators
Shell + Tube
Condensers
Compressors
Scroll
Hermetic
Liquid
Receivers
Compact
Semi-
Hermetic Condensing
Units
Semi-Hermetic
Compressor
Units
Open Drive
Receiver Units
Open Drive
Receiver Units
Semi-Hermetic
Components for
Easy, Flexible, Reliable
Parallel Compounds
‘Perfect Matching
Modular Concept’
Introduction / Product Range Overview
Open Drive Screw Compressors & Accessories

3. BITZER // S_OS_Features_GB // Page 3
Open Drive Screw Compressors
Design Features OS.53 .. 74
OS.74
CR
Discharge side
Suction side
Oil In
Shaft

4. BITZER // S_OS_Features_GB // Page 4
Side View
OS.74
Open Drive Screw Compressors
OS.(A)74..

5. BITZER // S_OS_Features_GB // Page 5
Top View
OS.7441 / 51 / 61 / 71
(OS.7441 only CR1)
CR1
CR2
Open Drive Screw Compressors
OS.(A)74..

6. BITZER // S_OS_Features_GB // Page 6
Open Drive Screw Compressors
Product Range
OSKA Versions (for NH3 // HT & MT Applications)
Qo
kW
Pshaft
kW
0
50
100
150
200
250
300
350
Capacity -10/45°C
Power (shaft)

7. BITZER // S_OS_Features_GB // Page 7
Open Drive Screw Compressors
Product Range
0
20
40
60
80
100
120
140
Capacity -35/40°C
ECO
Power (shaft) ECO
Qo
kW
Pshaft
kW
OSNA Versions (for NH3 // LT Applications)

8. BITZER // S_OS_Features_GB // Page 8
Open Drive Screw Compressors
Booster Systems

9. BITZER // S_OS_Features_GB // Page 9
Open Drive Screw Compressors
Basic Functions & Compression Process
Contents
/ Basic functions & compression process
/ Design features OS.53 .. OS.74
/ Design features OS.85
/ Accessories & options
/ Documentation

10. BITZER // S_OS_Features_GB // Page 10
ECO
SL
DL
pc
pecopo
p
s
Screw Compressors
Compression Process

11. BITZER // S_OS_Features_GB // Page 11
Open Drive Screw Compressors
Design Features – OS.53 .. OS.85
Contents
/ Basic functions & compression process
Design features OS.53 .. OS.74
/ Design features OS.85
/ Accessories & options
/ Documentation

12. BITZER // S_OS_Features_GB // Page 12
Integrated Capacity Control
OSKA74
CR50
CR75
ECO Port

13. BITZER // S_OS_Features_GB // Page 13
Open Drive Screw Compressors
Design Features – OS.53 .. OS.85
Contents
/ Basic functions & compression process
/ Design features OS.53 .. OS.74
Design features OS.85
/ Accessories & options
/ Documentation

14. BITZER // S_OS_Features_GB // Page 14
OS.85
Oil
DL
SL
ECO
Open Drive Screw Compressors OS.85
Mechanical Connections

15. BITZER // S_OS_Features_GB // Page 15
Integrated Oil Filter
Robust Bearing
Oil Stop Valve
OS.85 // Interior View

16. BITZER // S_OS_Features_GB // Page 16
OS.85 // Capacity Control by Slider Valve

17. BITZER // S_OS_Features_GB // Page 17
OS.85 // Integrated Discharge Gas Muffler

18. BITZER // S_OS_Features_GB // Page 18
OS.85 // Capacity Control
OS.A85

19. BITZER // S_OS_Features_GB // Page 19
OS.85 // Internal and External Accessories
ECO port integrated into slider valve (“Auto ECO”)
/ effective at full and part load operation
Muffler integrated in discharge chamber
Integrated oil management & monitoring system
/ Oil filter plus p control
/ Control device for oil pressure / oil flow
/ Oil stop valve with …
 control for sense of rotation
 indication of valve lift
without
external
pipes!

20. BITZER // S_OS_Features_GB // Page 20
Open Drive Screw Compressors
Design Features – OS.53 .. OS.85
Contents
/ Basic functions & compression process
/ Design features OS.53 .. OS.74
/ Design features OS.85
Accessories & options
/ Documentation

21. BITZER // S_OS_Features_GB // Page 21
Open Drive Screw Compressors
OS.85 with Coupling Housing
Coupling
Housing
Calculation with Software
 Accessories

22. BITZER // S_OS_Features_GB // Page 22
Open Drive Screw Compressors
OS.85 with Coupling Housing and Coupling
Coupling
Coupling
Housing

23. BITZER // S_OS_Features_GB // Page 23
Open Drive Screw Compressors
Oil Circuit with OS.(A)53 / 74 Series
FZ
5
6
789
23
4
1
11  6 mm (1/4")
10
12
(Option)
Oil Flow
Switch
Oil Filter
Oil Solenoid Valve
Stand Still Bypass
Oil injection kit
Primary
oil separator
Secondary
oil separator

24. BITZER // S_OS_Features_GB // Page 24
Open Drive Screw Compressors
Design Features – OS.53 .. OS.85
Contents
/ Basic functions & compression process
/ Design features OS.53 .. OS.74
/ Design features OS.85
/ Accessories & options
Documentation

25. BITZER // S_OS_Features_GB // Page 25
Open Drive Screw Compressors
Documentation
SP-500
SH-510
SB-500
SP-510
SH-510
SB-510
ST-500-4; ST-600-2; ST-610-2
SW-100-6; SW-110-2; SW-120-1; SW-500-2
SE-500-4
 BITZER Software
 EPARTS
 Internet / Data Sheets

26. BITZER // S_OS_Features_GB // Page 26
Ammonia Screw Compressors
Booster System (Principle)
Simplified sketch
LT (Booster / OSKAB) Optional „Side“ Load: MT / HT
(OSKA / OSNA)
Alternatives:
 OA (alone)
 OA + OAS
 OACPossibly with additional oil pump
(1) Suction bypass for pull down
(2) Oil level control between oil separators not shown
(1)
(2) (2)

27. BITZER // S_OS_Features_GB // Page 27
Cascade Systems
Possibly
Parallel Compound
with NH3 Screw
Compressors
(OSKA / OSNA)
(see previous pages)