EFFICIENT DATA CENTER

The refrigeration station in the HVAC system is a multi-device composition that requires joint and coordinated operation to reflect the overall performance of the organic whole, which is essentially a system engineering. At present, the project management of domestic refrigeration stations is mostly in the form of separate bidding for each equipment and installation of HVAC, strong and weak electricity and other specialties. It is not organized according to the concept of system engineering, which is easy to cause unsatisfactory equipment operation and overall performance of refrigeration stations. At the same time, many refrigeration machine rooms are based on the start-up and stop control of equipment operation and simple frequency conversion control for water pumps, relying on the experience of operators, which cannot guarantee that the machine room is actually in a high-quality operation point, and the measured operation efficiency is low.

To evaluate whether the cold water machine room is energy-saving, the use of "cold water machine room annual comprehensive energy efficiency", that is:

Engine Room Energy Efficiency =

W (chiller) W (chilled water pump) W (cooling water pump) W (cooling tower)

Q (total cooling capacity)

According to the standard proposed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), the overall energy consumption level index of the air-conditioning room is shown in the figure on the right:

As can be seen from the right figure, the computer rooms with "annual comprehensive energy efficiency of the chiller room" below 0.85KW/RT (I .e. the overall COP of the computer room> 4.14KW/K-W) are collectively referred to as high energy efficiency computer rooms (new projects generally require below 0.7kW/RT, I .e. the overall COP of the computer room> 5KW/KW). After energy audit, if the comprehensive energy efficiency of the refrigeration room is higher than 0.85kW/RT, it is the room that needs to be modified.

Energy-efficient room service is a service for energy-saving transformation of refrigeration room after energy audit and guarantee the efficiency of the room after transformation. The energy-efficient machine room is a complete solution for the systematic, intelligent and integrated in-depth optimization design of the machine room equipment of the central air conditioner, including chillers, chilled water pumps, cooling towers, pipeline valves, control systems and other equipment, to ensure that the overall efficiency of the whole refrigeration station always reaches the peak after it is running, after continuous integration and in-depth mining and developed for customers to improve the overall performance of the refrigeration station and reduce operating costs needs of an effective tool. Provide effective confirmation of the actual level of the overall energy efficiency of the computer room.

Seven Steps to Building an Energy Efficient Computer Room

Operation and maintenance

Automated operation

Equipment selection

Measurement, Verification, Management

optimal control

system application

system structure design

system application

Operation and maintenance

optimal control

Automated operation

system application

Equipment selection

system structure design

Characteristics of energy-efficient computer rooms

Real-time measurement, instrument reporting fault analysis

Preventive maintenance

program full optimization

Continuously Adaptive Control Loop

Proper system configuration

High quality equipment

Full frequency conversion

High energy efficiency machine room requires that the energy efficiency level of the equipment itself is relatively high, and the main engine, water pump and cooling tower should be of high efficiency type (the main engine adopts frequency conversion unit, and the motor of water pump adopts high efficiency motor). At the same time, the control of the system is also very important. The sensor should be selected with high precision and can meet the installation environment. The control strategy should be able to ensure that the entire system is running in a high-efficiency area for a long time. At the same time, in order to achieve a higher efficiency of the room, try to reduce the resistance of the water system (including local resistance and resistance along the way), the use of different characteristics of the requirements of the pipeline separation. The way to reduce local resistance is generally to appropriately reduce the use of valves] (switch to frequency conversion to meet changes in cooling capacity, etc.) to reduce local resistance such as elbows; the way to reduce resistance along the way is generally to minimize the length of the pipeline to ensure that the pipeline from the host to the water pump is the shortest.

The energy-efficient machine room realizes unattended automatic operation and simple operation through intelligent control technology, and the later maintenance is convenient, which can greatly reduce the system operation cost and maintenance difficulty. Energy-efficient computer room system is not a simple equipment supply, its value is more reflected in the comprehensive characteristics of equipment optimization selection, system optimization design, HVAC equipment and computer room control system integration, equipment installation and engineering management, and system-wide overall commissioning.

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