## 6 Conclusions  
In this study, a proportional-control-technique-based new control strategy is designed for a combined desiccant wheel and dew-point cooler system. This system has pre- and post-DPC coolers for cooling and a desiccant wheel system for dehumidification processes. The aim of the independent temperature and relative humidity control in the study is to provide the comfort of the room quickly and robustly with less energy consumption. Temperature and relative humidity control is provided by controlling the speeds of the fans and desiccant wheel in the process, respectively. For this purpose, in order to obtain the effect of the velocity of these actuators on the temperature and relative humidity variations of the room, mathematical models have been derived. In addition to the classical proportional control technique, the control performance has been increased by defining different operating modes for the actuators and adding the automatic Stop/Run feature. In addition, the operations of the water pump were arranged and the channel cleaning (flashing) mode was added to the cooling system for certain periods. The performance of the control strategy is analyzed for the case and the room comfort performance of the control strategy, the transition between the actuator operating modes, the control inputs produced for each actuator, and the energy consumed during the process were examined. The results show that the designed control strategy has a successful enough performance to provide room comfort quickly and robustly. Furthermore, it shows quick adaptation to changing set values. It is also observed that the operation of the actuators at variable speeds throughout the cooling process leads to more energy saving in comparison with the classic ON/OFF control technique. In addition, in the new control strategy developed, extra energy savings were achieved by defining different operating modes for the actuators, switching between modes according to ambient conditions, and adding the automatic Stop/Run feature. When the contribution of the added automatic Stop/Run feature to energy saving was calculated, it was determined that 21.19% less energy is consumed compared to the situation when it is not included in the control strategy (when the actuators work continuously throughout the process). As a result, it was determined that a total of 40.90% more energy saving is achieved compared to the classical ON/OFF controller. According to the results obtained, it is seen that the developed control strategy will achieve high successful temperature and relative humidity control for cooling processes by providing significant energy savings. Conceptualization, D.P., M.H.D., S.C., W.W. and J.P.; methodology, M.H.D., D.P. and S.C.; software, M.H.D., S.C., H.G.D. and O.H. ; investigation, M.H.D., S.C., O.H., H.G.D., D.P. and W.W.; resources, D.P. ; writing--original draft preparation, M.H.D., H.G.D. and O.H. ; writing--review and editing, S.C., D.P. and W.W.; visualization, M.H.D. and S.C.; supervision, S.C., D.P. and W.W.; project administration, D.P. ; funding acquisition, D.P. All authors have read and agreed to the published version of the manuscript. This research was funded by Polish National Centre for Research and Development, program Lider X, agreement number U/0180/666/2019, and by the European Regional Development Fund, Industrial research and development works conducted by enterprises, under the competition 1/1.1.1/2021 Fast Track of the Intelligent Development Operational Program 2014-2020, agreement number 11 IR/0011/2021, and by the Polish National Agency for Academic Exchange (Bekker program), agreement number BPN/BEK/2021/2/00014/U/00001/A/00001. * [PERSON] et al. (2019) [PERSON]; [PERSON]; [PERSON] Year-round-based optimization of high-low control in the regenerative indirect evaporative cooler (RIEC). _Sci. Technol. Built Environ._**2019**, _25_, 1394-1405. [CrossRef]
* [PERSON] and [PERSON] (2021) [PERSON]; [PERSON] Increasing evaporative cooler efficiency by controlling water pump run and off times. _Int.