Published on ginnyent on 3rd May, 2019
What is Heat Recycling?
It simply means a heat recovery process. It is the process by which dissipated heat is put to good use through conversion into useful forms of heat. This process takes place in big organizations, factories and institutions. The need for greater operational efficiency, reduced cost and greenhouse gas pollution in these organizations necessitates heat recycling, which has the potentials to achieve these and beneficially lessen global warming. There are forms of heat recycling and also technologies which enable heat recovery.
Waste Heat Recovery
It’s a form of heat recovery where dissipating heat at these manufacturing sites is converted into electricity and steam. The heat captured can also be channeled into the manufacturing process in the form of heated air, water, glycol or oil. This is made possible through the use of waste heat recovery boilers. These boilers have built-in water-filled tubes which when heated generate steam that powers turbine to produce electricity.
Waste heat recovery can also be made possible from air-conditioning. What happens here is that the heat from air-conditioners are collected and stored in thermal banks. The stored heat could serve as a source of heat in winter. In this way, you could avoid burning of fossil fuels and summer heat could be utilized during winter.
Waste Heat is Used to Generate Sound and Electricity.
Recently, waste heat has been successfully converted into sound and electricity. A group of physicists led by Orest Symko at the University of Utah reported from an experiment that waste heat could be converted to electricity in an efficient simple way by way of sound production.
Combined Heat and Power
This is another form of heat recycling. It is also known as cogeneration. In this process, a combined heat and power plant which could take care of the thermal and electrical loads of the facility not only produces electricity with less cost and greater operational efficiency, the excess heat produced is recovered and converted to processed heat plus power bonus. Combined heat and power has been described by the U.S environmental Protection Agency as an efficient, clean and reliable approach to generating electricity and heat from a single fuel source.
Heat Pumps and Thermal Storage
These are the two technologies that make it possible to recover heat from dissipation. Too low temperature heat that couldn’t be utilized can be harnessed through the use of heat pumps, which can source additional heat energy from seawater, the ground, the air or waste heat from a process. When there’s time lag between heat production and utilization, thermal storage technologies prove useful as they can store heat for hours and can be used inter-seasonally. These systems also store heat which result from changes in temperature of a medium or phase changes of a medium e.g heat change which occurs when ice is converted to water and vice-versa. The two forms of heat recycling which have been explained make up the decentralized power generation process which, by leaps and bounds, is more rewarding in power output and efficiency than the centralized process.