Modulating blower and compressor capacities for efficient comfort control

Summary

Notes that variable-speed compressor technology can increase efficiency of air conditioners and heat pumps by reducing the cycle's temperature lift. However, the increase in evaporating temperature is constrained by indoor comfort requirements. Latent loads depend on outdoor climate, due to air infiltration. Varying the indoor blower speed can provide the necessary humidity control by adjusting the evaporator surface temperature to meet latent loads at any compressor speed. Together these variable speed technologies can make it possible to maximise efficiency subject to indoor comfort constraints over a wide range of outdoor climatic conditions. Adds sensible and latent heat load equations to a detailed residential-scale vapour compression system simulation model to quantify trade-offs between indoor comfort and system energy efficiency.

Primary Author(s): Andrade M A, Bullard C W

Source: ASHRAE Trans., 2002, vol.108, part 1, paper number AC-02-5-3, 631-637, 11 figs, refs.

             BSRIA Abstract Doc 000103829 Abs 20020799

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