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.
Sources:
There are numerous sources for heat recovery, including but not limited to:
process plant cooling systems, refrigeration plants, air compressors, hot liquid effluents, etc.
Used in:
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.
Low High
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!
Comments