KyotoCooling Controls
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Kyoto Eco Controller Communication Modules Control mechanism User Interface |
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Kyoto Eco Controller
The Kyoto Eco Controller is a JAVA based control device manufactured by Tridium (a Honeywell company).
The control system has been specifically designed to support the continuity and quality control of
datacenter cooling. Each single KyotoCooling® cell is controlled by a single Kyoto Eco Controller.
The system is explicitly designed for functional autonomy and the regulating technique is fail-safe. This means that the system adapts, dynamically in near real time to changes in condition within the data center, with respect to outside environmental conditions and within the cell or cells.
The controller is capable of communicating with the installed equipment using the following open communication protocols:
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LON bus to the I/O modules (input/output);
MODBUS over IP to the variable frequency drives and power measurement devices; TCP/IP to the other Kyoto Eco Controller(s) in the system and to the outside world. |
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Communication
In a data center with KyotoCooling®, several cooling cells will be active for reasons of continuity (redundancy). These cooling cells operate in partial load and combined they form the cooling system. Several Kyoto Eco Controllers combined make up the control system and information is exchanged between the controllers mutually over a redundant IP network. Loss of network does not mean a loss of cooling.
A possible redundant communication setup with KyotoCooling
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Modules
The control is built up of different modules which, combined, ensure control of the whole. Each module controls a specific, delimited section of the installation. Wherever necessary, the modules exchange information amongst modules within the cell and amongst cells. The modules are independent program objects.
Modules control all aspects of the cells operation and perform all input monitoring. Inputs include ventilator flow, temperature, pressure, coolant temperature/pressure, vibration monitoring, wheel rotation monitoring, louver motor and state checks, direct expansion PLC interfaces, (water control valves where required), VFD interfaces, power state, critical load, fire alarm inputs and so on. In all 240 IO points per cell insure complete discrete control over all aspects of operation.
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Control mechanism
The KyotoCooling® process is made up of two main control mechanisms which regulate the recirculation air volume and control the make up air temperature which is more commonly referred to as the supply air temperature entering the data room.
Recirculation air
The heat load of the IT equipment is equivalent to the required quantity of cooling air by unit of
time. Since nearly the complete usage of power is converted by the IT equipment into heat, the total
heat charge of a computer room can be calculated on the basis of the measured power usage.
A more sophisticated way of controlling the air volume of the recirculation air is with the use of the
AirLull®
Supply air temperature
The actual cooling within a KyotoCooling cell, depending on ambient outside air conditions, can be done by open air alone, mechanical cooling alone, or a mixture of both systems. In order to do so, the temperature control ensures the control of the recirculation valves, the cold wheel, the outside air fans and the direct expansion (DX) cooling machines in that order.
System energy optimization is achieved by the amount of hours that either open air or a mixed cooling environment is used. To a certain set point of make up air, the recirculation valve, the turn speed of the rotary heat exchanger, the outside air flow and the steps in DX refrigeration are regulated. Depending on the ambient air temperature the different components are controlled to achieve maximum system efficiency.
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User Interface
Much sophistication exists within the controls which are now in third generation of development. The cells are functionally able to operate autonomously, alerting as required. Of course you can take the system off autopilot if required. All activities and system state changes are logged. There is a wealth of knowledge embedded in these controls over the last several years. KyotoCooling controls far exceed any control package that exists in market today or that could be created in a one-off site design simply because they have been continuously developed for several years for a single purpose, based on ratified hardware design, They are the epitome of quality, reliability and sophistication never before seen in the data center.
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