TO-98-09-2 -- Latent Capacity of Unitary Equipment PDF

The latent removal capacity of small unitary equipment is studied. Sensible heat ratios of this equipment are analyzed vis-à-vis the energy efficiency to learn if any relationship exists. It is determined that at two standard testing conditions, latent capacity has not changed significantly as the energy efficiency of small unitary equipment has increased over the last 20 years.

Sensible heat ratios for A and B test conditions are graphed against the energy efficiency ratio (EER) and the seasonal energy efficiency ratio (SEER) of the equipment. Various types of small unitary equipment, including both cooling-only and heating/cooling units, are included in the study. Linear regressions are performed to see if any correlation exists.

Visual inspection of the graphs and the results of the linear regressions demonstrate that the sensible heat ratio, under both the A and B test conditions, is not a function of energy efficiency (EER or SEER). Data from previous studies are also examined. Comparison of data from previous studies to data from the present study indicates that sensible heat ratios for equipment have not changed substantially over time, despite appreciable increases in equipment efficiency.

Units: Dual