Ventilation Heat Loss Calculator:
Enter the values of air change rate per hour, n, volume of the space, V(m3) and temperature difference between the indoor and outdoor air, ΔT(°C) to determine the value of Ventilation Heat Loss, Q(kW).
Ventilation Heat Loss Formula:
Ventilation heat loss refers to the amount of heat lost from a building due to the exchange of indoor air with outdoor air. This is a significant component of heat loss in structures, especially in colder climates, where heating systems work to maintain indoor temperatures. The process occurs when warmer indoor air escapes and is replaced by cooler outdoor air through ventilation systems, natural air infiltration, or open doors and windows.
Key factors influencing ventilation heat loss include the rate of air changes (n), the volume of the space being ventilated (V), and the temperature difference between the indoor and outdoor environments. Ventilation systems, while essential for maintaining air quality, can lead to energy inefficiencies if not optimized.
The formula for calculating ventilation heat loss incorporates a constant 0.33, representing the heat capacity of air per cubic meter, to ensure the result reflects the energy lost in kilowatts. By understanding and calculating ventilation heat loss, building designers and managers can implement better insulation and efficient HVAC systems to minimize energy loss.
The Ventilation Heat Loss, Q(kW) in kiloWatts equals 0.33, multiplied by the air change rate per hour, n, the volume of the space, V(m3) in cubic metres and the temperature difference between the indoor and outdoor air, ΔT(°C)in degree Celsius.
Ventilation Heat Loss, Q(kW) = 0.33 * n * V(m3) * ΔT(°C)
Q(kW) = ventilation heat loss in kiloWatts, kW.
n = air change rate per hour.
V(m3) = volume of the space in cubic metres, m3.
ΔT(°C) = temperature difference between indoor and outdoor air in degree Celsius, °C.
Ventilation Heat Loss Calculation:
1.Find the ventilation heat loss for a room with a volume of 200m3, an air change rate of 3 per hour, and a temperature difference of 20°C.
Given:n = 3, V(m3) = 200m3¸ ΔT(°C) = 20°C.
Ventilation Heat Loss, Q(kW) = 0.33 * n * V(m3) * ΔT(°C)
Q(kW) = 0.33 * 3 * 200 * 20
Q(kW) = 3960kW.
2.Determine the temperature difference if the heat loss is 990 kW, the volume is 150m3 and the air change rate is 2 per hour.
Given:n = 2, V(m3) = 150m3¸ Q(kW) = 990kW.
Ventilation Heat Loss, Q(kW) = 0.33 * n * V(m3) * ΔT(°C)
ΔT(°C) = Q(kW) / 0.33 * n * V(m3)
ΔT(°C) = 990 / 0.33 * 2 * 150
ΔT(°C) = 10°C.