Akademik Veri Yönetim Sistemi
ENERGY EDUCATION SCIENCE AND TECHNOLOGY PART A-ENERGY SCIENCE AND RESEARCH, cilt.30, sa.1, ss.55-64, 2012 (SCI-Expanded)
Ground surface temperatures and ground temperatures at different depths are required for the design of Ground-Source Heat Pump (GSHP) systems. The State Meteorological Affairs General Directorate (DMI) measures the ground temperatures at certain depths at some stations in Turkey. However, these measurements are valid only for the ground structures and properties at the measurement locations and, therefore, can not be used for other ground and ground surface properties. In this study, one layer ground temperatures were calculated numerically using at least 20 years daily mean values of ambient temperature, solar radiation, relative humidity and wind velocity. The data were taken from DMI for 20 cities selected from different climatic regions in Turkey. The depths for maximum and minimum temperatures in the soil and yearly constant temperatures at 12 m depth from the soil surface (soil end temperatures) were expressed in equations using the numerically calculated temperatures. It was found that soil end temperature is mainly dependent on the yearly mean air temperature. Other parameters that have also influence on the soil end temperature are soil surface absorption coefficient, evaporation fraction and yearly mean solar radiation. Maximum and minimum temperatures are only 0.48 degrees C higher and lower than the soil end temperature, respectively.