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Essay:
History of HAM (Heat-Air-Moisture)"The physics of moisture transport through building constructions has been known since the eighteenth century. The development of combined heat and mass transport models were first introduced by Philip and De Vries (1957). In 1966, Luikov (1975) developed the coupled equations for heat and mass transfer. His equations are based on the mass, momentum and energy conservation laws. Many transient Heat-Air-Moisture (HAM) transport models are based on Luikov's equations, using different assumptions to simplify the experimental evaluation of the transport coefficients. In 1991, a joint project was initiated by the International Energy Agencies (IEA): Annex 24 on Heat-Air- Moisture Transport in Insulated Envelope Parts (HAMTIE). It divided the existing HAM models into 9 types, ranging from steady state heat conduction and vapour diffusion models to transient heat, air and moisture transfer models. The current work adds to these types by developing and integrating a moisture transport model within a whole building energy simulation program." (Excerpt from: Nakhi, A.E., 1995, Adaptive construction modelling within whole building dynamic simulation
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