kokonaislämmöntuoton

Kokonaislämmöntuotto is a Finnish term that translates to "overall heat gain" or "total heat output" and is commonly used in the context of building energy performance. The concept refers to the total amount of heat energy that is generated, supplied, or added to a space within a specified period. This includes solar gains through windows, heat from occupants, lighting, appliances, mechanical equipment, and heating systems.

The measurement of kokonaislämmöntuotto is essential for designing and assessing the energy efficiency of buildings. It allows architects, engineers, and facilities managers to evaluate whether the heating load of a space is appropriate for its ventilation, insulation, and desired indoor temperature. Excessive heat gain can lead to overheating and the need for active cooling, while insufficient heat gain can result in uncomfortable cold conditions. Both situations negatively affect occupant comfort and increase energy consumption.

To calculate kokonaislämmöntuotto, professionals use a combination of physical measurements and simulation data. Sources of heat gain are typically identified and quantified, then summed. Solar heat gains are derived from window area, orientation, and insulation. Internal gains come from people and equipment, measured in watts per person or per appliance. Heating system output can be measured by sensors or computed from design specifications. The resulting figure is usually expressed in kilowatts (kW) or kilowatt-hours (kWh) over a day, month, or year.

Applications of kokonaislämmöntuotto analysis extend beyond new construction. It is used in retrofit projects to identify opportunities for reducing internal heat gains or improving shading. It is also a key input to building simulation tools such as EnergyPlus or Kraken, which model heating and cooling loads under various scenarios. By comparing the predicted and measured kokonaislämmöntuotto, professionals can verify the accuracy of their simulation models and ensure that building performance meets regulatory standards.