| dc.description.abstract | Abstract Greenhouse can protect plants from unexpected conditions like heavy rainfall, strong wind and insect attack. In a tropical humid greenhouses, problem that always occur is a very high micro climate. Plants can grow optimumly only in a suitable environtment. With a proper design, suitable air temperature for plant growth can be generated. Greenhouse's micro climate can be managed using a ventilation system. The economical way of a ventilation system is natural ventilation which utilize wind and thennal efects. Structures and shape of a building will give big influences to the natural ventilation's speed, This research study about natural ventilation system in a multi span greenhouse located at Cikabayan inside IPB Campus. This study found that opening for ventilation system in this building is only 26,4 % of the total building area which is still lower than the requirement amount (40 % ). The natural ventilation speed inside the building is 0,6 - 0,8 m/s ; it is lower than the recomending speed 0 , 5 - 1,O m/s. The natural ventilation is more dominated by thennal efect than wind effect. Temperature inside the building is higher 57" C than outside and the humidity is low. A design modification especially at the windward wall's area should be done to get a higher rate of ventilation speed. Keywords: muitispan, greenhouse, natural ventilation | id |
