What is heat recovery?
Heat produced in a thermodynamic cycle, as in a furnace, combustion engine etc., can be used in another process, such as heating feedwater or air to save energy and reduce related costs.
There are numerous sources for heat recovery, including but not limited to:
process plant cooling systems, refrigeration plants, air compressors, hot liquid effluents, etc.
There are also a variety of ways to use this recovered heat:
hot water generation (i.e. boiler feed), industrial process (heating/pre-heating), space heating, pre-heating ventilation/ combustion air, power generation, etc.
Refrigeration: Low V. high grade heat recovery:
Condenser heat rejection (typically 80 – 90% of total heat rejection) can be a good source of low grade heat.
Generally 10 – 20% of the heat from a refrigeration system is high grade.
However, low grade heat can be upgraded to high grade through the use of heat pumps.
CO2 heat pump: heat recovery:
A heat pump can be used in heat recovery in both commercial/ residential buildings & in industrial applications.
In a commercial/ residential building, the cold side of the heat pump is used to supplement the chiller while the the hot side is to supply Domestic Hot Water (195°F can be tempered to 125°F in buffer tank).
With industrial applications, high grade heat is produced for process needs. Waste water available at 105°F is used as a heat source and the heat exchanger can be used to isolate process water.
Heat recovery can be an efficient way to reduce waste & energy use in your facility and help bring down costs. Heat recovery increases overall efficiency and makes for a smoother process.
Contact us for a free consultation so we can identify the best option for your specific application!