Accurate cooling - heating load calculation plays an important role to design a Heating Ventilation and Air Conditioning (HVAC) system. Cooling - heating load calculation is not only to utilize the selection of appropriate components of HVAC system to maintain indoor thermal comfort but also to minimize the energy consumption for operating this HVAC system. However, the current load calculation method in Vietnam is a quasi-steadystate method with the utilization of design parameters accounting for extreme conditions. Because this current load calculation method does not consider the thermal storage of building envelopes which causes the heat transferring time lag, it provides one peak value of cooling or heating load for entire day. Some commercial software packages were used to calculate cooling – heating load in Vietnam. However, it is difficult to ensure that these software packages follow the design standards and climate data of Vietnam. This paper describes the transient load calculation method using 24 hour weather data, which is one of widely used methods in developed countries. This transient load calculation method serves as an useful tool for designing, inspecting and energy auditing for building HVAC systems.
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