Lämpöylijäämä

Lämpöylijäämä is a Finnish term that translates to "heat surplus" or "thermal surplus." It refers to a situation where the amount of heat generated within a system or a space exceeds the amount of heat lost or consumed. This concept is often encountered in the fields of building physics, energy efficiency, and thermodynamics.

In the context of buildings, a heat surplus can arise from various internal heat sources. These include solar heat gain through windows, heat emitted by occupants, and heat generated by electrical appliances such as lighting, computers, and cooking equipment. Even without active heating systems, a well-insulated building can accumulate a significant amount of heat from these sources, especially during warmer periods or when the building is densely occupied.

A positive heat surplus can be beneficial in cold climates as it reduces the need for active heating, thereby lowering energy consumption and costs. However, in warmer climates or during summer months, an excessive heat surplus can lead to overheating and discomfort, necessitating cooling systems. Managing thermal surplus is therefore crucial for maintaining comfortable indoor temperatures and optimizing energy performance. This often involves strategies like proper ventilation, shading, and efficient appliance use. The balance between heat gains and heat losses is a fundamental consideration in designing energy-efficient and comfortable buildings.