In most developed countries, a large amount of energy use of about 6% of the total is for air conditioning and refrigeration. The same is true for many hot countries where air conditioning systems use up to 40% of energy in the cities, and this could be a major problem as developing economies continue to grow.
Due to current climate trends, which have, as a consequence, seen an increase in global temperatures, there is evidence of a progressive increase in the cooling load in most cities of the world. Within this context, the energy efficiency of cooling facilities is becoming more and more important. The requirement is that all current design projects are made with the objective of achieving the closest results to real-life scenarios that may arise when cooling systems are operational. The key to this will always be to predict the energy demand required for the cooling system, and understand the behavior of the cooling system when it is in operation. Naturally, carrying out this task is not at all simple, and not doing it, increases the risk of the served facility being exposed to adverse situations. There are certain considerations that must be taken into consideration by the cooling plant designers.
The compliance route usually uses the ESEER (European seasonal energy efficiency ratio), which is defined by the Eurovent certification company. In summary, the ESEER is calculated by combining full and part load operating EER (energy efficiency ratio) values for different seasonal air/water temperatures with the appropriate weighting factors. As expected, manufacturers publish ESEER values based on conditions that don’t generally correspond to those that a particular facility will be exposed to. Therefore, ESEER values are essential when it comes to comparing the performance of similar cooling equipment, but they do not always reflect the true performance of a cooling plant when operational.
ESEER values normally used for the European region, as shown in the following table: