【Daily Discussion】Utilities - HVAC - 20200721

The cooling load refers to the use of air conditioning as a heat source, while the heating load generally pertains to centralized heating systems, where the heat source is usually a boiler or similar device

The calculation of air-conditioning load requires an hourly indoor-outdoor temperature difference method, while the calculation of heating load requires a daily average temperature difference method. The air-conditioning load includes heat loss through the building envelope, heat gain from radiation, and heat dissipation from people and equipment, while the heating load includes heat loss through the building envelope and heat loss due to cold air infiltration.

The heating load includes heat loss through the building envelope and heat loss due to cold air infiltration, while the cooling load includes heat loss through the building envelope, heat gain from radiation, and heat dissipation from people and equipment. Difference in the design calculations for air conditioning load and heating load: The calculation of the air conditioning load requires the use of an algorithm based on the hourly difference between indoor and outdoor temperatures, whereas the calculation of the heating load uses an algorithm based on the average daily temperature difference. Since the average value of the temperature difference between indoor and outdoor areas in winter is much larger than the fluctuation value of this difference, using an algorithm based on the average temperature difference results in less error. However, although the instantaneous outdoor temperature during summer days can be much higher than the indoor temperature, it can be lower than the indoor temperature at night; therefore, the average temperature difference between indoors and outdoors is not large compared to winter

The heating load includes heat loss through the building envelope and heat loss due to cold air infiltration, while the cooling load includes heat loss through the building envelope, heat gain from radiation, and heat dissipation from people and equipment. Difference in the design calculations for air conditioning load and heating load: The calculation of the air conditioning load requires the use of an algorithm based on the hourly difference between indoor and outdoor temperatures, whereas the calculation of the heating load uses an algorithm based on the average daily temperature difference. Since the average value of the temperature difference between indoor and outdoor areas in winter is much larger than the fluctuation value of this difference, using an algorithm based on the average temperature difference results in less error. However, although the instantaneous outdoor temperature during summer days can be much higher than the indoor temperature, it can be lower at night; therefore, compared to winter, the average temperature difference between indoors and outdoors is not large.

The heating load includes heat loss through the building envelope and heat loss due to cold air infiltration, while the cooling load includes heat loss through the building envelope, heat gain from radiation, and heat dissipation from people and equipment. Difference in the design calculations for air conditioning load and heating load: The calculation of the air conditioning load requires the use of an algorithm based on the hourly difference between indoor and outdoor temperatures, whereas the calculation of the heating load uses an algorithm based on the average daily temperature difference. Since the average value of the temperature difference between indoor and outdoor areas in winter is much larger than the fluctuation value of this difference, using an algorithm based on the average temperature difference results in less error. However, although the instantaneous outdoor temperature during summer days can be much higher than the indoor temperature, it can be lower than the indoor temperature at night; as a result, compared to winter, the average temperature difference between indoors and outdoors is not large, but the range of fluctuations is relatively large. If the daily average temperature difference method is used, it results in underestimated cold load calculations.

The heating load includes heat loss through the building envelope and heat loss due to cold air infiltration, while the cooling load includes heat loss through the building envelope, heat gain from radiation, and heat dissipation from people and equipment. Difference in the design calculations for air conditioning load and heating load: The calculation of the air conditioning load requires the use of an algorithm based on the hourly difference between indoor and outdoor temperatures, whereas the calculation of the heating load uses an algorithm based on the average daily temperature difference. Since the average value of the temperature difference between indoor and outdoor areas in winter is much larger than the fluctuation value of this difference, using an algorithm based on the average temperature difference results in less error. However, although the instantaneous outdoor temperature during summer days can be much higher than the indoor temperature, it can be lower than the indoor temperature at night; therefore, the average temperature difference between indoors and outdoors is not large compared to winter

The heating load includes heat loss through the building envelope and heat loss due to cold air infiltration, while the cooling load includes heat loss through the building envelope, heat gain from radiation, and heat dissipation from people and equipment. Difference in the design calculations for air conditioning load and heating load: The calculation of the air conditioning load requires the use of an algorithm based on the hourly difference between indoor and outdoor temperatures, whereas the calculation of the heating load uses an algorithm based on the average daily temperature difference. Since the average value of the temperature difference between indoor and outdoor areas in winter is much larger than the fluctuation value of this difference, using an algorithm based on the average temperature difference results in less error. However, although the instantaneous outdoor temperature during summer days can be much higher than the indoor temperature, it can be lower than the indoor temperature at night; therefore, the average temperature difference between indoors and outdoors is not large compared to winter

The calculation of air-conditioning load requires an hourly indoor-outdoor temperature difference method, while the calculation of heating load requires a daily average temperature difference method. Since the average value of the temperature difference between indoor and outdoor areas in winter is much larger than the fluctuation value of this difference, using an algorithm based on the average temperature difference results in fewer errors. However, although the instantaneous outdoor temperature during summer days can be much higher than the indoor temperature, it can be lower than the indoor temperature at night; therefore, compared to winter, the average temperature difference between indoors and outdoors is not large, but the range of fluctuations is relatively large. If the daily average temperature difference method is used, it results in lower calculated cooling load values.

The cooling load of air conditioning needs to be calculated on a time-based basis, while the heating load is calculated under steady-state conditions

The heating load includes heat loss through the building envelope and heat loss due to cold air infiltration, while the cooling load includes heat loss through the building envelope, heat gain from radiation, and heat dissipation from people and equipment. Difference in the design calculations for air conditioning load and heating load: The calculation of the air conditioning load requires the use of an algorithm based on the hourly difference between indoor and outdoor temperatures, whereas the calculation of the heating load uses an algorithm based on the average daily temperature difference. Since the average value of the temperature difference between indoor and outdoor areas in winter is much larger than the fluctuation value of this difference, using an algorithm based on the average temperature difference results in less error. However, although the instantaneous outdoor temperature during summer days can be much higher than the indoor temperature, it can be lower than the indoor temperature at night; as a result, compared to winter, the average temperature difference between indoors and outdoors is not large, but the range of fluctuations is relatively large. If the daily average temperature difference method is used, it results in underestimated cold load calculations.