DEVELOPMENT OF THE NEW TEST CHAMBER FOR THE CALIBRATION OF THE HYGROMETERS

Ölçüm cihazlarının kalibrasyonunun düzenli olarak yapılması bir zorunluluktur. Kalibrasyon, belirlenen koşullardaki değerlerle, ölçme sisteminin veya ölçme cihazının gösterdiği değerler arasındaki ilişkiyi belirleyen işlemler dizisidir. Bu çalışmada; bir seri sıcaklık ve nemin gözlenmesiyle, nem ölçerlerin kalibrasyonunun yapılması için özel bir düzenek hazırlandı. İzole bir kabin içerisinde %15 ile %95 aralığında bağıl nem değerleri sağlandı. Düzenekte, sistemin kararlı hale gelebilmesi için kurutma ve egzoz sistemi tasarlanıp, tüm işlemler elektronik olarak kumanda edilerek, sensörler yardımıyla da bilgisayar üzerinden izlendi. Sistem kararlı hale geldikten sonra, önceden kabin içine yerleştirilmiş olan kalibrasyonu yapılacak nem ölçerin ölçüm sonuçlarıyla, psikrometrenin (referans ölçüm cihazı) ölçüm sonuçları karşılaştırıldı. The calibration of the measuring instruments must be done periodically. Calibration is the set of operations, the relationship between values of quantities indicated by a measuring instrument or measuring system represented by a reference material and the corresponding values realized by standards. In this work, the humidity and temperature is observed and the special apparatus is prepared for the calibration of the humidity measurements. In the test chamber the relative humidity is taken in between % 15 and % 95. In apparatus, the drying and eject system is planned for the steady-state system and all process are commanded electronically and are displayed, followed by sensors on the computer. After system becomes steady state, the results of humidity measurement installed in the test chamber are compared with the results of psycrometer

INFILTRATION CHARACTERISTICS IN MULTI-FLOOR BUILDINGS

Infiltration or in other words the air leakage in buildings has an important role on heat load calculations. The rate of this loss has been estimated as 20 to 30 % of the total load. The indicated important effect of infiltration on the load calculations needs a reliable method for the determination of air leakeage level in buildings. Meantime, the rate of infiltration has an additional importance at the area of thermal comfort studies which deals with the air quality of enclosed volumes. During this research study, first the mechanism of infiltration and the major components of the phenomena (wind pressure, temperature difference) was discussed together with the theoretical considerations. Later, several conventional engineering approachs and emprical methods was reviewed and compared among each others. At the last part of the paper, the modified DIN 4701 method which is presently used in Turkey, and some other algorithms was applied to some pilot buildings and the predictions was compared with experimental results