Utilization of waste heat adds little to capital cost

but increases energy effectiveness significantly.

If fluid-bound waste heat is available in a building during the heating season it should be considered as a source to heat outside air. Waste heat is typically added to the energy recovery fluid circuit through plate and frame heat exchangers. Examples are waste heat from cooling data centers, call centers or chilled beams. 

Controls

To chieve a high recoevry efficiency, the addition of waste heat to the fluid circuit of the energy recovery system has to be considered when determining the optimal fluid flow rate. A pure "Performance Optimization", that is, controlling the fluid flow aret as a function of variable air volume only, yields a very low recovery efficiency.

A multi-function energy recovery system must consider and account for actual air volumes, air and fluid temperatures, supplemental heat sources, and the performance mapping of the coils, pumps and valves.

Optimal Design

To design the most effective system, Konvekta developed a customized version of DOE-2 building simulation software. Input data includes the coil design, internal and external heat loads, variable air volumes, and local weather data.

Konvekta offers complimentary "Optimization calculations".