Data center energy-saving-hot and cold air separation

"Article abstract" traditional data center cooling did not carry out reasonable airflow management, more than 60% of the cooling capacity because of bypass, reflux, hot and cold air stratification and other waste. Too much local hot spots lead to excessive planning of refrigeration equipment and a great waste of cooling capacity. The hot and cold airflow is the main cause of the low cooling efficiency of the http://www.aliyun.com/zixun/aggregation/33196.html ">, and how to manage the air flow and effectively realize the hot and cold isolation becomes the focus. According to TechTarget 2010 statistic results show that only about 30% of the domestic users have the use of hot and cold air separation.

1. Introduction

"Twelve-Five" is our country to fulfill the Copenhagen commitments of the most important five years, energy saving is the country "Twelve-Five" of the top priority.

Ministry of the "Twelve-Five" plan that China's data center carbon emissions in the "Twelve-Five" five years will increase by one times;

The September 2011 study by Forrester Research, "Data center power and cooling heat consumption," shows that the current energy costs account for about 70% of the average operating cost of data center facilities;

The refrigeration system-related power consumption occupies about 37% of the data center operation;

Survey shows: investment in domestic data center construction has grown by more than 20% annually

Therefore, the data center energy-saving crisis is increasing, how to improve its energy efficiency has become a hot topic.

2. Traditional Data Center Analysis

Traditional data center cooling does not carry out reasonable airflow management, more than 60% of the cooling capacity because of bypass, reflux, hot and cold air stratification and other waste. Too much local hot spots lead to excessive planning of refrigeration equipment and a great waste of cooling capacity.

Fig. 1 schematic diagram of airflow return

Fig. 2 schematic diagram of airflow bypass

Fig. 3 schematic diagram of airflow stratification

3. Solving Ideas

From the above, the hot and cold airflow chaos is the main cause of low cooling efficiency, and how to manage the air flow and effectively to achieve hot and cold isolation becomes the focus. According to TechTarget 2010 statistic results show that only about 30% of the domestic users have the use of hot and cold air separation.

Fig. 4 Cold air flow suppression scheme

Fig. 5 Heat Flow Suppression scheme

4. CFD Analysis of cases

Taking a small data center computer room as an example, using the 6Sigma DC software of future facilities company, set up a virtual data center to simulate the distribution of air flow, temperature and static pressure, such as internal IT equipment, refrigeration equipment, power equipment, etc. The performance and pue improvement of the traditional cooling and hot air control system were analyzed.

Computer Room Overview

Area 50m2,it Equipment A total of 80, power total 13.92kw;30kva PDU One, 30KVA UPS, 20KWACU 3 units.

CFD Modeling and Simulation

Fig. 6 schematic diagram of the original computer room (① cabinet; ②acu;③pdu; fig. 7) Air flow field diagram of the original scheme of computer room

④ups;⑤ floor Grille; ⑥ elevated floor

Fig. 8 Cold Flow suppression flow field diagram (using Eaton airflow suppression System) FIG. 9 Thermal Flow suppression flow field diagram (using Eaton airflow suppression system)

Results statistics

The parameters are compared as follows:

Note: The above Pue value statistics are not included in the illumination, only to increase the performance and energy-saving contrast after separating the hot and cold airflow.

From the above table shows: The use of hot and cold air separation, airflow bypass, reflow, hot and cold stratification and so on are well resolved, the performance improved significantly. The use of cold air separation and thermal air separation to achieve the energy-saving effect is basically consistent, can be specific according to user needs and the building environment of the room to determine.

User Benefits

Pue value from 1.884 to 1.506, energy saving 20%;

Energy savings: 46165kw h/years, carbon dioxide emissions reduction of 29 tons/year;

Refrigeration equipment: 30KW ACU Quantity saves 2 units.

5. Conclusion

This paper mainly analyzes the common problems existing in the current data center cooling and puts forward the idea of separating and sealing the hot and cold air, and analyzes the customer benefits brought by using the CFD software simulation. With the global attention to energy issues, how to effectively reduce the data center Pue become a trend, and hot and cold air separation and sealing scheme with its low cost, improve obvious, easy to realize the characteristics will be widely used in China.