3. Analyze three examples
3.1 Example 1 – Industrial laundry generating liquid effluent at 90°C and 2 bars (gray water loaded with detergent, dissolved grease, fibers, etc.).
In order to reduce energy consumption and comply with regulatory requirements, the operator has integrated a heat recovery unit to preheat tap water to 15°C, which is then fed into the cleaning process. Recoverable power depends on :
of the thermal efficiency target (recovery rate) selected for the project; thus, an efficiency of 60% generates a city water heating of 60% x (90-15) = 45°C;
fluid flow rates; thus, the recoverable power Prec is deduced from the city water flow rate according to the following expression: Prec (in kW) = 4.18 x flow rate (kg/s)...
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Bibliography
Also in our database
Regulations
Décret n° 2019-771 du 23 juillet 2019 . This decree, known as the tertiary sector decree, requires industrial sites of over 1,000 m 2 to reduce their energy consumption by 40% by 2030.
Websites
Association of over a hundred heat exchanger manufacturers and integrators.
Industrial association for energy efficiency, including a CEE club presenting all standard CEE operation sheets.
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