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Google energy saving - Sustainable Data Centers

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Our energy-saving data centers
Explore Googles data centers

Googles secure data centers are some of the most energy efficient in the world. Each year we save millions of dollars on energy costs, and we use renewable energy whenever we can.

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9 MISTAKES IN SUSTAINABLE DATA CENTER DESIGN AND PLANNING
Sustainable Data center, design and planning
Sustainable Data center, design and planning


>Here at Google we've spent more than a decade striving to improve the energy efficiency of our data centers.While we design much of what is housed in our facilities, the high level of efficiency we've achieved is due simply to our rigorous application of best practices.

There are many simple design choices that you can apply to both small and large data centers to improve the efficiency of the facility. Saving energy will reduce the impact on the environment and also lead to significant financial savings

Here are the top 5 recommended best practices from our data center experts


1. Measure PUE

You can't manage what you don't measure, so characterize your data center's efficiency performance by measuring energy use. We use a ratio called PUE - Power Usage Effectiveness - to help us reduce energy used for non-computing, like cooling and power distribution. To effectively use PUE it's important to measure often - we sample at least once per second. Its even more important to capture energy data over the entire year - seasonal weather variations have a notable affect on PUE.

2. Manage airflow

Good air flow management is fundamental to efficient data center operation. Start with minimizing hot and cold air mixing by using well-designed containment. Eliminate hot spots and be sure to use blanking plates for any unpopulated slots in your rack. We've found a little analysis can pay big dividends. For example, thermal modeling using computational fluid dynamics (CFD) can help you quickly characterize and optimize air flow for your facility without many disruptive reorganizations of your computing room. Also be sure to size your cooling load to your expected IT equipment, and if you are building extra capacity, be sure your cooling approach is energy proportional.

3. Adjust the thermostat

Raising the cold aisle temperature will reduce facility energy use. Don't try to run your cold aisle at 70F; set the temperature at 80F or higher -- virtually all equipment manufacturers allow this. For facilities using economizers (we strongly recommend it), running elevated cold aisle temperatures is critical as it enables more days of "free cooling" and more energy savings.

4. Use free cooling

"Free cooling" is removing heat from your facility without using the chiller. This is done by using low temperature ambient air, evaporating water, or using a large thermal reservoir. Chillers are the dominant energy using component of the cooling infrastructure; minimizing their use is typically the largest opportunity for savings. There is no one 'right' way to free cool - but water or air-side economizers are proven and readily available.

5. Optimize power distribution

Minimize power distribution losses by eliminating as many power conversion steps as possible. For the conversion steps you must have, be sure to specify efficient equipment transformers and power distribution units (PDUs). One of the largest losses in data center power distribution is from the uninterruptible power supply (UPS); be sure to specify a high efficiency model. Also keep as high a voltage as close to the load as feasible to reduce line losses
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Sustainable data centers