1. Cooling Solutions for Telecom Precision Cooling for Maximum Efficiency
1、公司的重视程度：08年公司业务沟通大会上，明确表示PEX和Rack将是公司重点推广的新产品。
2、在1月份将陆续有一些关于PEX的资料发布，3月份正式发布风冷、水冷、乙二醇冷却机组，随后发布冷冻水机组，08年基本完成PEX与CM+的切换。
3、定价高，但是制冷量段更加细分，有单压缩机机组，非常好的增加销售额的机会。
非标能力加强；PEX相关数据更加详细；相关认证
4、既是老产品，又是新产品，客户不是白老鼠

2. Agenda
Why Precision Cooling
Liebert DM Solution
Liebert SC Solution

3. Why Do We Need Precision Cooling Units?
Temperature Control
Humidity Control
Operating Hours
Operating Costs
Load Density
Air Movement
Filtration
Standby Capability
Serviceability
Reliability

4. Precision vs. Comfort Cooling
Precision Cooling Equipment
High sensible heat ratio
95% of work = cooling air temperature
5% of work = removing humidity
Comfort Cooling Equipment
lower sensible heat ratio
60 % of work = cooling air temperature
40 % of work = removing humidity

5. High SHR Means Savings On Electricity Consumption
General office environments have loads that are 60-70% sensible (.6-.7 SHR), while sensitive equipment rooms have % sensible loads ( SHR)
30% percent more sensible cooling translates to 30% saving on electricity for Sensitive Equipment Room Applications
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions
General Office
Comfort A/C
Computer Room
Liebert DM

6. High SHR Means Cost Savings
Precision
Comfort
Sensible kW 90
Total kW
100
150
Unit EER 3
Input kW 33 50
Energy Charge
$0.12 / kWH
Operating Cost / year
$34,690
$52,560
Save $17,000 in one year !

7. Precision vs. Comfort Cooling
Consequences of Different Design Objectives:
To provide 95kW of sensible cooling, you can use EITHER
Comfort cooling
with 160kW
total capacity
AND replace the
60kW of latent heat
(humidity) which
was also removed
unnecessarily
Precision Cooling
with
100kW
total capacity OR

8. Comfort Cooling: Not Appropriate for Computer Rooms
Description
Precision A/C
Comfort A/C
Temperature control
22°- 24 °C
21°- 27 °C
Sensible Heat Ratio (SHR)
>0.9
<0.7
Energy Efficiency Ratio (EER)
11.4
<10
Air discharge
1300CMH
<1000CMH
Outdoor temp. adaptability
-34°- 45 °C
-5°- 42 °C
Electric Reheat
2.7 kW
N/A
Com. Interface
RS485
Self recovery & delay restart
0 to 240 sec
Electrical endurance
220V±25％
220V±10％
Year-round operation duration
10 years
3 years

9. Liebert Precision AC is better than Comfort AC
For one site, assume 3,000W load and room area 20 sqm., heat load will be about 5,000W.
Precision
Comfort
SHR
0.9
0.6
Sensible kW 5
Total kW
5.6
8.3
Unit EER 3
Input kW
1.9
2.8
Energy Charge per kWH
0.1
Annual savings in kWh
8111
Annual savings in cost USD
811
For Sites (USD)
Annual savings in kWh: ,111,000
Annual savings in power cost: ,100

10. Agenda
Why Precision Cooling
Liebert DM Solution
Liebert SC Solution

11. Liebert DM Applications When Comfort Cooling Is Not Enough
Precision cooling solution for sensitive equipment rooms
Built with reliability for 24/365 operation
Small footprint, front access
Applications
Server / computer room
Electrical switch board room
Telco closet
Satellite earth station
UPS room

12. Liebert DM What benefits do we get from Liebert DM
over comfort air conditioning?
30% more sensible cooling efficiency
1.5x more airflow to prevent hot spots
20% air filtration efficiency
low MTTR (mean time to repair)
2x longer operating life
greater reliability for 24x365 operations
sophisticated microprocessor control
The Liebert DM is available in
5.5kW and 7.5kW capacity /single-phase
7.5kW and 12.5kW capacity /three-phase
A total of 30 units of Liebert DM are installed at the Audio and Video Control Room of the Beijing Olympic Center

13. Features Low total cost of ownership Designed for reliability
Energy saving mode through sensible heat ratio cooling
Adapts to different environments
Designed for reliability
Provides consistent and stable operating environment 24 x 7 x 365
Low mean time to repair (MTTR)
Maintenance free design for daily operation
Standard RS232 port for monitoring
Small footprint, 100% front access
Highly efficient cooling system
Ultra wide ambient temperature range
High sensible heat ratio with scroll compressor technology for most models

14. Liebert DM Heavy Duty Fan
Rigid, strong metal fan
Reliable and heavy duty
Comfort A/C
Soft and weak plastic fan
Light duty
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions

15. Liebert DM Reliable Compressor
Scroll Compressors
Copeland compliant scroll
Excellent reliability due to few moving parts
Endures liquid slugging
Low noise and vibration
Smooth compression with scroll operation
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions

16. Liebert DM Electric heater
PTC electric heater
Low surface temperature heater
The resistance of the electric heater is proportional to the temperature
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions 人员

17. Wide Input Power Range For Maximum Flexibility
Liebert DM 3 phase
380V ±20%
Visual & audio alarm of power phase lacking
Self-regulating power phase disorder
Liebert DM single phase
Basic type 220V ±15%
Optional accessory 220V ±25%
LiebertDM3Phase+O ±25%
LiebertDM3Phase ±20%
DMSinglePhase±15%
comfort±10%
Comfort A/C only for 220V±10%
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions 人员

18. Auto Restart after Power Failure
Self-start immediately
Delay self-start option (1-255 sec) : Avoids multiple units starting at the same time, drawing too much inrush current

19. Control Design and Humidifier
Micro processor controlled
Temp. variation within ±1℃
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions
Liebert DM humidifier
RH variation within ±5%

20. Control Pad 人员 Micro processor based controller Self-diagnose
Code protection – avoiding false operating
All alarm information
30 alarm records
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions 人员

21. Communication Master/slave auto shift RS232 connection
Free com protocol
Liebert DM
Comfort A/C
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions
Liebert DM Circuit board

22. Auto Shifting Only needs 2 set of wires Shift can be set up to 7 days
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions

23. Communication Cell phone messaging Network Management System
SiteMonitor
Ethernet LAN / WAN
HTTP
SNMP
TCP/IP
Intellislot
232,
Dry Contact
SNMP Card
Cell phone messaging

24. Condenser Fan motor: Continuously on Variable Transmission
Anti-corrosion
Heavy duty
Small size & light weight
Low noise
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions

25. Agenda
Why Precision Cooling
Liebert DM Solution
Liebert SC Solution

26. Energy Efficient Air Conditioning
Controller
Free cooling
Compressor work 26

27. Integrated design / Free-cooling mode
Liebert SC
7.5kW
Integrated design / Free-cooling mode

28. Liebert SC Features PTC Heater Indoor fan Filter Controller Air damper
Actuator
Condenser
Outdoor fan
Scroll compressor
TXV
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29. Key Components
High efficiency and low noise backward curved centrifugal inside cycle fan
High EER Copeland compliant scroll Compressors
PTC reheater
High precision flow regulation and wide temperature range adaption TXV of Danfoss
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions

30. Key Components High efficiency , low noise fan designed for long life
High-precision regulation and continuously adjustable air flow damper actuators of BELIMO
High efficiency and washable filter of Polymer for Polyurethane materials
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions

31. Key Components
Pluggable design SPD for power supply and telecommunication
High efficiency Aluminum Louver fin and rifled copper tube evaporator
SPD for
Telecommunication
SPD for
Power Supply
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions

32. Powerful Controller Large size LCD display
Cooling mode automatically switches on
Multi-alarm protection
Self-start when mains supply resume
RS485
Self-regulating in an event of a power phase disorder
ac eqpt does 2 things
reduce temperature called sensiblecapacity
reduce moisture called latent capacity
the sum of these two is the total capacity
The nominal capacity specified of an ac has 2 components, sensible and latent.
Latent loads, moisture, comes from people and moist air from the outside. Sensible loads are from heat transfer from the outside, lights, and electrical equipment.
the proportion or percentage has a great deal to do with efficiency and ability to meet t&H conditions

33. Chassis acts as water container
Easy To Maintain
Washable condenser /
Chassis acts as water container
100% front access
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34. Optional waterproof covers, mosquito nets, bracket etc.
Easy to install
Optional waterproof covers, mosquito nets, bracket etc.
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