Abstract
Minimum temperature difference should be achieved in conditioned rooms to meet comfort criteria. It is desired that the temperature set by a user from the control unit, should be the same in the entire room. Therefore, the position of the control unit plays a significant role in order to achieve a homogeneous temperature distribution in the room. In this study, the effect of control unit positioning on temperature and velocity distributions in a room, where a cassette type indoor unit was applied, was numerically investigated. Blowing temperature and speed of the indoor unit has been adjusted by the temperature value that measured by a control unit which was placed at five different locations, in order to examine positioning effects of the control unit. Predicted percentage dissatisfied (PPD) values were calculated, and uncomfortable zones were determined by 2-dimensional analyses. Cooling loads, as well as energy consumptions, were calculated and their variations according to the position of control unit was figured out in steady state conditions. The results showed that control unit positioning not only influences the comfort levels or temperature distributions in a room but also energy consumptions.
Highlights
The appropriate hygiene, thermal comfort and indoor air quality conditions must be met in order to live a quality life in terms of in the environments where human live and work
It is seen that when the thermostat set temperature (Tset) is 15 °C in steady state conditions, Predicted percentage dissatisfied (PPD) is around 30 at the discharge zone of the air conditioner and parallel to the ceiling, whereas other areas of the room do not show much variation (Fig. 6)
It is seen that when the thermostat set temperature (Tset) is 25 °C in steady state conditions PPD was found to be 30 in a certain area where the wall of the ceiling and the ceiling intersect, and the other regions of the room PPD did not approach to zero
Summary
The appropriate hygiene, thermal comfort and indoor air quality conditions must be met in order to live a quality life in terms of in the environments where human live and work. Aynur et al [1] examined experimental methods of Variable Refrigerant Volume (VRV) system and compared them with Variable Air Volume (VAV) system. They found that in the individual control mode of the VRV system, the cooling performance factor was between 3% and 15% higher than the master control mode and stated that it was not possible to provide thermal comfort in each zone by temperature control with a single thermostat. Noh et al [3]
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