Abstract
The paper examines two methods of choosing the initial reference point for exergy of the moist air flow. The first method is characterized by a zero exergy value at the current temperature and humidity of the outdoor air, which are variable both in daily and annual periods. Another is characterized by constant values of parameters of moist indoor air (its temperature and humidity in the room). A comparative study has shown the advantages of the second method: greater stability of values in air processing processes and their convenient presentation on exergy chart. However, it should be noted that this method provides a non-standard technical representation in which the entire energy flow is reduced to zero. The climatic information (temperature and humidity of the outside air) for numerical-analytical experiment has been used from official open sources. The city where the air conditioning system was supposedly installed is Stavropol. The research has been carried out in the summer and cold periods of the year. It is assumed that there are not installed any large heat sources in the room and the main heat sources appeared depending on the period of the year. Additionally, the air conditioning system was equipped with a recirculation line from the serviced room with a mechanical ventilator. The recirculated air entered the mixing chamber in the air conditioning unit which is reducing the consumption of heat energy in the cold season. There are the processes of air conditioning on the Ramzin's h–d-diagram for warm and cold operational modes of air conditioning unit, the air conditioning system under consideration.
Highlights
As a rule, the analysis of energy parameters of air conditioning systems is carried out using the balance method, taking into account only the first law of thermodynamics
The proposed reference level of the exergy has a number of advantages in comparison with the variable reference point according to the outdoor air parameters
The most important advantage is the greater stability of the values and marks of the air exergy flow
Summary
The analysis of energy parameters of air conditioning systems is carried out using the balance method, taking into account only the first law of thermodynamics. The drawback of this method is that it does not differentiate types of energy and their energy value in relation to the environment. The method of thermodynamic analysis using the concept of exergy (a workable part of energy) has, in our opinion, insufficiently employed reserves. The classical development of the exergy method of thermodynamic analysis was commenced in the end of the XIX century
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