FAQ – Frequently Asked Questions




The temperature in my server room is around 20 degC, the cooling capacity of the air conditioning systems is far greater than the actual power consumption of the servers, yet some of my servers overheat. Why is that ? and what can I do to solve it.

For the server to actually cool and maintain an appropriate working temperature, conditioned air need to flow through the server. The amount of heat drawn by the air depends on the temperature of the air and airflow rate of the air flowing through the server. A server that overheats means the product of the airflow rate and air temperature difference is too high. Immediate actions that can be taken are preventing from hot air to flow to the server (by using blanking panels, isolating the hot or the cold aisle etc.), reducing temperature of supplied air (this might solve the overheating problem on a short term but will increase the energy consumption.

On the long run – a detailed design of the datacenter cooling method is recommended. For an existing datacenter, replacing high density racks with CooliT air cooled server racks immediately remove the hot spots without the need for expensive infrastructural changes in the datacenter.

I am interested in improving my datacenter energy efficiency, what are the first steps I need to take?

The first step to improving datacenter energy efficiency is - knowing where you stand. Audit your datacenter & know how much energy is consumed by each of the elements (servers, air conditioning systems, UPS etc). You will probably find out that the most significant consumers of energy are the servers and the air conditioning systems therefore prioritizing your saving efforts to those two will probably generate the most significant savings.

Can you suggest a few simple ways of optimizing energy consumption in the datacenter?

As server cooling is one of the major consumers of energy in the datacenter, optimizing server cooling is one of the first steps that you can take in order to optimize the energy consumption in your datacenter.

First, simple and a very cost effective way of improving server cooling is by optimizing the air flow. This can easily be achieved by using blanking panels on non-used places, sealing cable cutouts to reduce leakage of conditioned air to the hot aisle (by using cabling brushes, by closing openings under server racks etc.)

CooliT server racks are designed to optimize airflow in the datacenter. The cold aisle was moved to the rack and the air flow rate is regulated according to the actual heat load.

For more details please refer to brochure and the white paper.

Blade servers on one hand provide many advantages and are becoming more commonly used. However bale servers consume unprecedented amounts of power per rack unit which is converted heat. The result is high heat density per rack that must be handled. What impact will this have on my data center, what can I do to utilize my existing datacenter for these products?

The heat density (amount of heat per rack unit) of blade servers is much higher than previous generation servers. The Heat load per rack typically ranges from 10kW to 20kW and it is expected to grow to 30KW in the not so far future.

Most Conventional datacenter were not designed to handle such heat density, the problem is not cooling capacity, normally your datacenter will have enough of it – the problem will be dissipating the heat from the high density racks.

To handle high density, you need cooled server racks. Implementing water cooled solution means a dramatic infrastructural change that will require downtime. This might be an option when you construct a new server farm. For the existing server farm implementing CooliT's air cooled server rack will provide an instant solution for high density without the need for any infrastructural changes in the room.

For more details please Contact us.

Is it true that a high temperature difference ensures high efficiency of the air conditioners?

Yes it is true, a high temperature difference between the return air and supply air of the air conditioner improves its efficiency, however :

  1. You build the room for your servers and not your air conditioning units – the design should take into consideration the required working temperatures of your servers. High temperature in you servers will dramatically reduce reliability of you servers and increase failure rate and in addition will increase servers energy consumption because their fans will operate in turbo mode.
  2. Energy optimization should be done all the whole facility and not just the AC systems.