Assessing indoor environmental quality is a key element in analysing the conditions of indoor use conditions, determining both the health of its inhabitants and the level of efficiency of work and learning processes. Previous studies described in the literature on decentralised ventilation devices operating in alternating air supply and exhaust modes have focused primarily on analysing their energy parameters, air exchange efficiency and the efficiency of their heat exchangers for energy recovery. This article modelled the indoor environment using computational fluid dynamics (CFD) in AnsysFluent. The numerical model was verified with experimental data. It demonstrated the highest level of agreement with the results of experimental studies conducted in real‐world conditions. The developed simulation model enabled analysis of the device′s operation under conditions of a sustained outdoor air temperature of −20°C. An evaluation of the possibility of ensuring thermal comfort in the room during the operation of the device without a heat exchanger for heat recovery and a heater was performed. The hypothesis was confirmed by simulation results that heat losses that occur during the cold air supply phase cannot be compensated for by the inflow of warmer air from an adjacent room during the exhaust phase. The results of the analysis indicate rapid cooling of the room, where the temperatures ranged from −5.3°C to 15.5°C. This indicates an inability to maintain thermal comfort, defined as a minimum of 20°C. The results obtained provide significant information on the evolution of indoor environmental parameters under the operating conditions analysed. They form the basis for further research and in‐depth analyses of the operation of alternating air supply and exhaust systems, particularly in the context of ensuring thermal comfort and energy efficiency.
Ewa Zender-Świercz (Thu,) studied this question.