Commisioning of air-conditioning system

This study presents the method, procedure and partial results of commissioning of air conditioning system. The work was carried out with Justus Lispsius building of the Ministry Council of the European Union in Brussels. The objective of the commissioning is to check the hydraulic characteristics of air distribution system and the thermal performance of air handling units, use the simulation method to predict the cooling demand, improve the performance of air-conditioning system, eventually minimise the energy consumption. The study contains: on-site investigation, equipment modelling and simulation and performance analysis. During on-site investigation, detailed measurements combined with interviews with operators and manufacturers were made. The measurements includes pressure, air velocity, air temperature and humidity, water temperature. The information provided by BEMS (Building & Energy Management System) were compared with measuring results to ensure the temperature and humidity sensor can give correct results. Model of air distribution system were developed and calibrated with on-site measuring results. By simulating the air distribution system, the analysis was made on how to obtain better performance. Model of heating coil and cooling coil were developed. The characteristics of heating and cooling coils were identified on the basis of manufacturers data. A commissioning test on air - conditioning system was made in order to check the precision of cooling demand estimation in the whole building by using simulation method. The simulation result was compared with measuring results of energy meter. It shows that simulation can be used as an effective tool in practice to analyse and predict the global performance of whole system. Control regulation of temperature control is discussed on the basis of the typical operating situation of air handling unit in winter time.