Abstract
The room air conditioner (RAC) is considered the most suitable space heating method for residential buildings without domestic heating in the mild climate zone. The heating performance of RACs has been well researched in laboratories. However, the field performance of RACs is far from the laboratory experimental results owing to their installation and maintenance procedures. This study investigates the impact of the indoor unit installation height of RACs on their field performance during heating. By adjusting the height of the indoor unit, the energy performance and thermal sensation indexes are verified. An experiment is carried out to test the thermal comfort and energy performance simultaneously, which comparatively reflects the difference between different installation heights. The indoor air temperature and related parameters, predicted mean vote, vertical temperature difference, floor temperature, draft, and asymmetric thermal radiation are used to evaluate the indoor comfort. The heat capacity and coefficient of performance are used to assess the energy performance. Experimental results show that the installation height of the indoor unit affects the energy performance significantly. Generally, the heat capacity and coefficient of performance for lower installation heights are higher than those for higher installation heights. Furthermore, lower the installation position, the easier it is to create a comfortable indoor environment.
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