Browse Prior Art Database

# Method and system of pre-refrigeration for green computing

IP.com Disclosure Number: IPCOM000190388D
Original Publication Date: 2009-Nov-26
Included in the Prior Art Database: 2009-Nov-26
Document File: 4 page(s) / 38K

IBM

## Abstract

In enterprise computing center, especially the computing center of cloud computing, refrigeration is a big problem for IT department. In a typical scenario, there are a lot of computers in the same room, and the IT department needs to control the temperature of the room to make sure that the computers can work well. The traditional process to control the temperature is 1. Define the “standard” temperature. 2. Detect the temperature of the room. 3. If the temperature is higher than the “standard” temperature, start up thermoregulator, or increase its power. 4. If the temperature is lower than the “standard” temperature, decrease the power of thermoregulator, or shutdown it. There is its topology view. The blue points mean the sampling point to get the temperature. It looks like a sophisticated solution, but if we think about detailedly, we will find there are some issues. 1. It highly depends the temperature detector. In any case, the detector can only detect the limited points in the room. 2. It’s always hysteretic if there is some changes in the IT system. For example, some computers are startup, or some heavy tasks are started. In such case, heat dissipating capacity is changed and thermoregulator needs to response it. The actual process is 1) The computer generates more heat. 2) The temperature inside the computer is rising. 3) The temperature outside the computer is rising via heat exchange. (There is no guarantee that thermoregulator will start to work at this point because of the limitation of the temperature detector.) 4) The temperature of the area which is detected by the temperature detector is rising. 5) The power of thermoregulator is rising. 6) The temperature of the area which is controlled by thermoregulator is brought down. 7) The temperature outside the computer is brought down. 8) The temperature inside the computer is brought down. Also, in fact, it’s a circular process because thermoregulator is almost always over-refrigeration. The actual scenario is just like the following chart. The “standard” temperature is 25℃. 3. In order to maintain the temperature in the “safe” region (for example, the temperature should not higher than 40℃), there should be enough buffer between the “standard” temperature and the boundary of the “safe” region. By the traditional refrigeration, in the case above, the “standard” temperature has to be defined at about 25℃. There is 15℃ buffer for the hysteresis of the traditional refrigeration. Further, if the IT system is very large, and the change of the IT system is frequent, the traditional refrigeration can’t match the requirement. For example, in the computing center of the cloud computing, because the machines are configured frequently, the heat generator in the server room is always changing. The temperature distribution in the server room is asymmetric and easy to out of control.

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Method and system of pre -

-refrigeration for green computing

refrigeration for green computing

In the traditional refrigeration , the thermoregulator is controlled by the temperature detector . In the pre-refrigeration system, the thermoregulator is controlled by the agent in ammeter or on the power line . Based on the energy consumed by the computer , the power of the thermoregulator is adjusted at the same time when heat is generated .

There is the new topology view . The light blue points mean the agent on the power line .

Thermoregulator

Machine A Machine B Machine … Machine X

In the new topology, it's the agent in the power line to control the thermoregulator . It can get theaccurate requirement for the thermoregulator.

So, still in the sample above , the time temperature transformation curve will become smoother . At the same time, the stability of the system is enhanced highly .

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Temperature

Normal refrigeration pre-refrigeration

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Further, because the temperature range is smaller now , it's safe to set the "standard" temperature at 35℃. It reduced the energy consumed by the thermoregulator .

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Temperature

Normal refrigeration pre-refrigeration

26

24

22

20

18

16

14

12

10

0:02

0:06

0:10

0:14

0:18

0:22

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0:38

0:42

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0:50

0:54

0:58

1:02

1:06

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1:14

1:18

1:22

Time

For the data center, the power of the temperature control eControl

P should be equal with the heat release of the computer lease

Heat

Temperatur

E Re plus the

heat exchange between the room and the environment exchange

E . For a computer, a pure electrical equipment, its heat release lease

Heat

E Re equals its

power computer

P .

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