2008 Volume 33 Issue 137 Pages 47-53
Generally speaking, as for heating load calculation, indoor heat which is released from OA instruments, human body, and lighting equipment during winter is taken no account in maximum heat load calculation method, because they act on the safety side for air-conditioning system. However, owing to increasing indoor heat and improving building insulation efficiency in recent years, heating load during winter begin to decrease. According to another report which investigates heating load in cold district, it tells us that every hour daytime heating load except starting time in the morning is almost 50% in comparison with the results which is calculated using maximum heat load calculation method. We can also know from this report that heating load tend to decrease even in the cold district. If we design heat source capacity using present design method in spite of these background as stated above, it could be overestimated and deteriorate its energy saving performance owing to frequent partial load operation. Therefore, from the point of improving energy saving performance for air-conditioning system in the cold district, it is important for us to design its heat source capacity appropriately. Aiming to suggest a new heat source design method for air-conditioning system in the cold district, we carried out investigation on heating load and cooling load in the designated office building. We have also practiced fundamental preheating test during winter with a purpose of reducing peak heating load, which occurs starting time in the morning and confirm its reproducibility of results of measurement and annually basis energy saving effect using general purpose simulation program HASP/ACLD/ACSS. In this report, results of these studies are presented. It was found that new heat source design method, which enable us to reduce heat source capacity in cold district in comparison with the one which is designed by present design method, could be available.
