KPN early last year found that… the marketdemand is such that… they need a lot of capacity for new data centers. There is good thought about how that could be… done optimally in terms of cost and energy. We found a solution in KyotoCooling. This solution has two aspects: That is, the separation of the hot and the cold air… in the computer room … and the second aspect is … the way in which the warm return air of the computerroom can be cooled. We are here at the computer room… where the cold air is introduced through this wall… and is led into the cold aisles and then to the server racks. The air from the cold aisles is picked up by the server systems… is heated and then fed to the hot aisle… where the air is sucked into the cooling system again. We have solved the cooling problem of Datacenters..
. in the sense that we have shown… that cooling of data centers does not need to be expensive. Expensive in terms of energy… and in terms of costs associated with them for kW-hours. Because we use less energy, we also become greener. We were just here on the data floor… where the cold air enters through the grid. This is the serverside airflow sucked from the server racks… which is cooled by the Kyoto Heat Wheel… and is again routed to the data floor. That is the socalled indoor air flow. The outdoor air flow is located on this side. The aspirated air is heated by the heat exchanger… and again outwardly disposed. To understand the components of the Kyoto cooling system… we'll follow the two air-flows to explain them in more detail. It starts on the outside… with an outdoor grille where the outside air is sucked… in order to realize the free cooling. The outside air is filtered. We then consider the air inlet section.
Here we find a silencer section. Whether or not and at what capacity silencers are placed depends on the environment. Here is also the bypass damper and air duct … to preheat outside air at times of very cold temperatures… to keep the temperature at a constant level. Next we go to the actuator of the rotary heat exchanger. Here we can see the actuator of the KyotoCooling rotary heat exchanger. And finally above me the famous horizontal rotary heat exchanger… that ensures a free cooling… on an anual basis of more than 80 percent of the operating hours. Here you can see the chiller… which ensures that, during the few number of hours on an annual basis… …at which high ambient temperatures prevent free cooling, the desired serverroom temperature is guaranteed. There is chosen for four chillers of 150 kW. Now we go up to see what happens with the cooled air. We are now at the top of the KyotoCooling heat wheel.
The cold outside air is drawn through the heat wheel, cedes it's cold to the heat wheel… while being sucked by the fans here present. Here we see the variable speed fan motors. The amount of air to be sucked in by the KyotoCooling rotary heat exchanger… can be continuously adjusted as a result. The intake air is blown through the condenser. This ensures that during summer situation the heat is discharged. Behind the condensor is a silencer section if needed. Finally a blocking damper is found to build up resistance to preheat outside air. What we just saw was the outside air-part of the installation. Now we are on the server side of the installation. At the left we see the fans that suck the heated air from the server room… in order to push the hot air through the cooled rotary heat exchanger towards the serverroom. We are now at the cold side of the installation.
The cooled air, derived from the free cooling,… comes out of the rotary heat exchanger… and follows it's way to the evaporator coil. In cases of hot summer temperatures… this evaporator coil in conjunction with previously seen… DX coolers and condenser, provide the extra needed mechanical cooling. The cooled air is finally blown through a set of silencers… after which it arrives at cold aisles of the data floor. An electrical cabinet ensures that under… any circumstances the desired temperatures will be maintained… and as little as possible energy is used… for the cooling of the server room. KPN's main objective is of course generating sales… as well as reducing costs with in this case the aid of KyotoCooling. The cost of KyotoCooling compared to conventional cooling… are much lower and significantly reduce the PUE. Another advantage…
. and perhaps as important as well, is that by using KyotoCooling… we use way less energy and therefore less CO2 emissions occurs. This fully fits into the global efforts to improve the environment. KyotoCooling means that you turn off the light. To save energy, this is ultimately the best practice… to turn off the lamp and that's what we actually do… compared to the traditional cooling methods: We turn off the lamp. So there are practically no cooling costs involved. that means a substantial reduction on CO2-emissions as well. and effectively eliminates the need to compensate for it. Actually this is then the best way to achieve the objectives of the Kyoto Treaty… as well as the additional objectives that the Dutch and European authorities have imposed? Absolutely! This is simply consuming less while doing the same.