Untersuchungen zum Einsatz von Verdunstungskühlung innerhalb eines hybriden Lüftungskonzeptes

Investigation and application of evaporate cooling within a hybrid ventilation scheme.

It is a challenge to attain a high level of thermal comfort during the summer without using energy intensive air conditioning systems even with high insulation standards of the walls in new buildings. Despite moderate inner loads and intensive protections against solar gains a cooling load often remains that affects the thermal comfort. This paper investigates by means of computer simulation a hybrid ventilation concept where cooling is provided by a direct evaporative cooler. The research work has been carried out within a DSTDFG cooperation program with the Indian Institute of Technology Roorkee, where a prototype of such a cooler is investigated and optimised.
This paper analyses the potential for use of evaporative cooler in low energy buildings and traditional buildings with lower insulation standard under Central European summer conditions. In addition, the influence of shading appliances, ventilation strategy, thermal insulation of the building and the humidity content of the outside walls is investigated.
It has been found that evaporative coolers, together with a suitable ventilation strategy and sufficient shading are able to provide levels of thermal comfort comparable with those gained by mechanical air conditioning systems.