BACKGROUND FOR DEVELOPING THE PARAMETER CONTROL SYSTEM OF THE COMFORT ZONE OF OFFICE PREMISES

Abstract

The results of the research related to the selection and justification of the parameters of office space comfort zones and sensors for their control have been presented. The parameters that determine the comfort zone of the premises have been divided into two groups. The first group includes microclimate parameters (temperature, humidity, and air quality). The second group includes the parameters due to the equipment operation (radiation, lighting, dust, atmospheric pressure, noise). It has been shown that the level of comfort depends on the class of office space. For classes A and B, the microclimate parameters can be controlled and maintained by built-in air conditioning systems. However, the parameters of the second group require the development and implementation of specific engineering solutions. Class C, D, E office premises require the development and implementation of control systems, both for the microclimate parameters and the parameters due to the equipment operation. The paper presents a thorough analysis of standards and scientific publications on the object of research. Based on the results of the analysis, it has been concluded that existing publications, as a rule, provide mechanisms and tools for assessing individual parameters of the comfort zone and do not provide recommendations for their generalized (comprehensive) definition. Standards regulate either the normalized values of parameters or provide methods, principles, approaches to obtaining them. A three-step algorithm has been developed to define the parameters that determine the comfort zone of office premises. The peculiarity of this algorithm is that it allows simultaneously taking into account both the level of employee satisfaction with the comfort zone and the actual values of the parameters obtained using instrumental measurement methods. This approach allows finding a correlation between the results obtained by the questionnaire survey and by measuring and selecting the optimal parameter values of the office space comfort zone. To determine the configuration of the control system of office space comfort zone more than 50 sensors manufactured by different firms and companies have been analyzed. The selection and substantiation of sensors were carried out by the method of comparative analysis of their technical characteristics. According to the results of the analysis, seven sensors were selected. In particular, the SHT30 sensor manufactured by the Swiss company Sensirion was chosen to determine the temperature and humidity; for measuring air quality BME680 sensor from the German company Bosch was chosen; to determine the illuminance – a sensor type GY-302; for electric radiation – digital unipolar sensor A3144; for the dust parameter – the sensor of the Chinese company Waveshare; for noise level measurement – a sensor based on the MAX9814 amplifier manufactured by the American company Arduino and for atmospheric pressure – a BMP280 sensor. The research results should be used at the stage of control system development, both the microclimate parameters and the parameters due to the equipment operation. They are especially relevant for office premises of C, D, E classes, which have a lower level of comfort zone compared to classes A and B.