The Impact of the Climate Model Details on the Accuracy of Power Consumption Calculation of Air Conditioning Units

Abstract

In assessing the energy efficiency of the building an important role is attributed to the energy consumption of various devices of the air conditioning systems, since it can be calculated only on the basis of the probabilistic distribution of the parameters of the outdoor climate in the construction area. An important aspect of the climate model is the detail with which it provides the repeatability of temperature and relative humidity combinations.The article examines the results of the energy consumption calculations for an air conditioning system in Moscow based on the initial information provided by the probabilistic-statistical model of the climate, which has been built according to the data of primary observations at the Moscow weather station for 30 years. Moreover, the climatic model has been considered in two options: firstly, the repeatability of combinations of the climate parameters is given for the cells with a 2 °C temperature step and a step of 5 % of the relative humidity; secondly, for cells with a 1 °C temperature step and a step of 2.5 % of the relative humidity. In the first case, the content of the model represents a table of 19×37 cells, in the second case it makes 36×69 cells.The results of the energy consumption calculation of the air conditioning system “with a second heating” indicate a significant increase in the accuracy of calculations at a smaller step of the climate model. The calculation accuracy has become greater due to more exact determination of the consumption of heat, electricity and water at each combination of the temperature and the relative humidity of the outdoor air and, especially, due to clarification of the transition boundaries from one operation mode of the air conditioning unit to another.