värmeåtervinningsgrad

Värmeåtervinningsgrad, often abbreviated as η or ER (Energy Recovery), is a dimensionless quantity used to quantify the efficiency of a heat recovery system. It represents the ratio of the actual heat recovered by the system to the maximum theoretically possible heat that could be recovered under ideal conditions. In simpler terms, it tells you how much of the wasted heat is successfully captured and reused.

The calculation of värmeåtervinningsgrad typically involves measuring the temperature difference between the incoming cold fluid and the outgoing cold fluid, as well as the temperature difference between the incoming hot fluid and the outgoing hot fluid. The specific formula can vary slightly depending on the type of heat exchanger and the fluids involved, but the general principle remains the same. A higher värmeåtervinningsgrad indicates a more efficient heat recovery system, leading to greater energy savings and reduced operational costs.

In ventilation systems, värmeåtervinningsgrad is particularly important. It measures how effectively the outgoing stale air transfers its heat to the incoming fresh air, thereby preheating it during colder months and pre-cooling it during warmer months. This reduces the energy demand for heating and cooling the building. Factors influencing värmeåtervinningsgrad include the design of the heat exchanger, the flow rates of the fluids, and the material properties of the heat exchanger surfaces.