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ın this study, the air to air heat pump that was installed to a room having dimensions of 6000x4000x3800 mm, was tested between the outdoor temperatures of -5°C and 5°C for different refrigerants , namely R134a, R404A, R407C and R410A. The electric power drawn by the compressor, indoor unit and outdoor unit fans, temperatures and pressures at the state points were measured. Experiments at the same outdoor temperatures were repeated three times under the controlled conditions. Analyses of the results obtained from the experiments were carried out by the computer code that was developed by means of Engineering Equation Solver EES-V9.172-3D . The power consumed by the compressor, heating capacity of indoor unit, the absorbing heat capacity of outdoor unit, coefficient of performance of the heat pump, suction and discharge pressures of the compressor were investigated according to the outdoor temperatures. As the outdoor air temperature increased, the power consumed by the compressor increased whereas the indoor unit and outdoor unit capacities and coefficient of performance of the heat pump decreased on average. R134a is the most favourable refrigerants among the refrigerants under study due to consuming the least compressor power and having the highest coefficient of performance

Aim: In this study, we aimed to investigate the first presenting complaints and operative results of patients who were operated for lung hydatid cyst and to determine the rate of co-existing liver hydatid cysts. Methods: Seventy patients who had been operated for lung hydatid cyst between 2004 and 2008 were included in the study. Clinical, radiological and surgical data of these patients were evaluated retrospectively. Results: The cyst(s) were perforated in 30 patients and were intact in 40 patients. They were right-sided in 35 patients, left-sided in 29, and bilateral lung cysts in three patients. Of the patients, 49 (70%) had undergone cystotomy and capitonage, seven patients-cystotomy, and two patients had undergone wedge resection. Of the perforated cysts, 23% presented with clinical and radiological findings of pneumothorax. Complications were observed in nine patients and the most common complication was atelectasis. Conclusion: Parenchyma-sparing surgery is a safe and effective treatment modality for lung hydatid cysts. Accompanying liver dome cysts can be intervened at the same session. The rate of cases with perforated cysts presenting to emergency clinics with findings of pneumothorax should not be overlooked. (The Me di cal Bul le tin of Ha se ki 2011; 49: 105-9)