In this study, it is aimed to determine the effect of greenhouse cover material of different color on the number of heating (HDHN) and cooling degree hours (CDHN) and heating (HDH) and cooling degree hours (CDH) of the lettuce plant. For this purpose, the study was carried out in the CtrlG (Control transparent PE greenhouse), RedG (Red PE greenhouse) and BlueG (Blue PE greenhouse). The study was completed in 2018 at ISUBU research and application farm. The temperature values measured in the three greenhouses with the same dimensions were the material of the study. HDH, CDH, HDHNs, and CDHNs were calculated by examining the measured temperature values and suggested temperature values for the lettuce plant. By using these values, it was tried to determine suitable cover material during the growing period of the lettuce plant. It has been concluded that the use of colored covering material is more suitable in terms of energy needs in almost all growing periods of lettuce plants. By comparing the values calculated for RedG and BlueG based on CtrlG, the coefficients of variation were calculated to determine which data series or series were more similar to each other. According to the coefficients of variation, the ...
The thermal energy demand during the production period in greenhouses is important for determining the production economics and feasibility studies to be carried out. This is because evaluating future investments in the greenhouse sector requires accurate estimates of energy demand and costs. For this purpose, the heat energy required in the greenhouse and the heating costs were calculated, taking into account the meteorological conditions of the region, the optimum temperature demand of the plants and the technical specifications of the greenhouse. Two different cover materials were used to determine the heat energy requirement: polyethylene sidewalls and roof (PE) and polycarbonate sidewalls + polyethylene roof (PC+PE). In addition, calculations were made for 8 different greenhouse combinations, including different insulation statuses (poor, medium and good insulation) of these greenhouses without thermal screen and with thermal screens. As a result of the study, it was calculated that the amount of energy consumed was reduced by 4.5% when PC covering material was used instead of PE covering material as covering material for the greenhouse side walls. In greenhouses covered with PE and PC+PE covers, if well-insulated thermal screens are used, the amount of energy consumed will decrease by 23.1%-22.4%, respectively, compared to PE and ...
