Recovery: Heat Recovery
Heat Recovery Overview
Waste heat recovery is a process that recovers heat from hot streams with potential high energy content, such as those generated with waste heat from data centres.
Such process can be used to reduce auxiliary energy consumption. Whilst in principle waste heat recovery seems straight forward due to the “low grade” nature of data centre exhaust air or refrigerant it is not a straight forward process.
Workspace Technology are currently innovating in the area and have introduced a number of technology options for specific applications.
Waste “Air” Heat Recovery
Where area’s adjacent to the data centre require heating, Workspace Technology can deploy “cross flow heat exchanger” technology. The cross flow heat exchanger allows heat to be transferred directly from the outlet air to the make up air through the separating walls of the heat exchanger. The hot make up air can be distributed to adjacent space through existing or a dedicated HVAC system.
The large contact area in a relatively small space of the cross flow heat exchanger air plates make for a high efficiency of heat transfer in excess of 70% in some applications along with a low pressure loss.
Water Heating Systems
When conventional refrigerant systems are installed the hot exit refrigerant can be used to heat “potable” hot water.
This process is achieved through the installation of the Eureka permanent transfer system. This system will enable heat to be transferred from the refrigerant to water via a double pipe heat exchanger passing in a contra-flow configuration. Hot water will return to the hot water tank.
The Eureka system will supply hot water at sufficiently high temperatures within minutes. In turn the heat exchange process removes heat from the refrigerant will reduce the cost of cooling.
These systems can be considered where conventional condensers are to be deployed and there is a requirement to generate local potable hot water.