Application of ethylene glycol in ventilation systems with variable air flow

Voronezh State Technical University, Moscovskiy prospect, 14, Voronezh, 394026, Russia

^* Corresponding author: Kafedravgasu@yandex.ru

Abstract

The relevance of the use of ethylene glycol as an intermediate heat carrier in the ventilation system during the treatment of supply air is justified. A description of the operation scheme of a cooling system with an intermediate heat carrier at a variable supply air flow rate is presented. On the Id-diagram of the state of the humid air, the construction of air treatment processes in the central air conditioner for all purposes of the transformed room is performed. The authors have established the need for cooling and dehumidification of the supply air in all operating modes. In order to determine the maximum possible load on the elements of the building’s air conditioning system, the type of room with the highest supply air consumption was selected and the air treatment process was constructed on an Id diagram at different outdoor temperatures. A method for calculating the parameters of the cooling medium is developed and graphs are constructed that allow us to establish the relationship between the parameters of the heat exchange equipment and the purpose of the room. The regularities in the change of the parameters of the heat and cold carrier when regulating the operation of the system depending on the change in the load on it are revealed. The operating ranges of the proposed scheme of air treatment with an intermediate heat carrier in the warm period of the year with variable flow rate of the treated air and various parameters of the outdoor air are given. Based on this, the possibility of creating an algorithm for automating the ventilation system adapted for buildings of cultural and entertainment purposes is justified.