Data Centres are an integral part of the network and Internet-based services. Large amounts of heat are generated in a data centre by electronic equipment and this needs to be flushed to avoid overheating of the components. Data centres are operational round-the-clock 365 days. So, a large amount of energy is consumed by conventional HVAC systems, usually PAC units, to maintain the required temperature for the servers.
In order to reduce the power consumption, two-stage cooling towers can be used integrated to the PAC units.
By using two-stage cooling towers:
1.The power consumption of the two-stage cooling tower is 0.05 kW/tonne compared to 1.2 kW/tonne of conventional systems.
2. Our two-stage cooling tower can provide WBT (-0.5 deg Celsius), i.e approach is -0.5 degree Celsius, whereas conventional cooling tower gives WBT +3 degree Celsius, i.e. approach is 3 degree Celsius.
3. Depending on the wet-bulb temperature of the place throughout the year, a major part of the load can be shed from the chiller.
4. A significant amount of GHGs is mitigated by reducing the power consumption of energy-intensive cooling.
In PAC units, there are usually 2 coils where heat is exchanged between water and air. We can integrate the two-stage cooling tower to one of the coils. In this way, the hot air from the data centre is initially pre-cooled before sending to the chiller. The chilled water temperature in the second coil can be regulated based on pre-cooling effectiveness, thereby reducing the load on the chiller.
The process of two-stage evaporative cooling happens at two levels. At the first level, the ambient air is taken into the tower through the heat exchanger which actually cools down the incoming air sensibly, i.e. without adding moisture. The chilled water from the cooling tower is circulated into the heat exchanger for this process. This air is further passed through a fill in a counter flow direction to the movement of water during which the inlet water temperature cools down due to evaporation. Due to this, the cold outlet water temperature of equal or lower than WBT can be achieved, i.e. WBT – 0.5 deg Celsius. In a normal cooling tower, outlet cooling water temperature achieved is WBT+3 deg Celsius.
Similarly, remote hydrogen-based fuel cells can be used to power telecom towers.