Abstract. The present study both the motive nozzle and device, based on the cooling capacity of as refrigerant. Previous studies HC290 (propane) in the air conditioner performance (COP). The purpose of replacing as an expansion device in improve the COP. In developing the model, conservation laws of mass, momentum and energy equations were applied to each part of the ejector. The numerical results show that the mm) under varying condenser temperature constant-area decreases as that improvement of the COP can reach 32.90% at °C. From the results mentioned ejector can further improve the COP of a split as working fluid. The present study describes a numerical approach for determining and constant-area diameters of an ejector as an expansion cooling capacity of a split-type air-conditioner using R290 Previous studies have shown that replacement of HCFC R22 with in the air conditioner can improve the coefficient of The purpose of replacing the capillary tube with an ejector n a split-type air conditioner using HC290 is to further improve the COP. In developing the model, conservation laws of mass, momentum and energy equations were applied to each part of the ejector. The that the motive nozzle diameter remains constant (1.03 condenser temperatures, whereas the diameter of the as the condenser temperature increases. It was also found the COP can reach 32.90% at a condenser temperature of 55 mentioned above, it can be concluded that the use of an ejector can further improve the COP of a split-type air conditioner using HC290 COP improvement; ejector; expansion device; propane; split-type air type air conditioners are widely used in residential and commercial known fact that air conditioners (AC) consume a very energy to maintain indoor air temperature. Air-conditioning approximately 50% of the total energy consumption of a building As a result, a small improvement in the performance of the system will generate a significant impact on energy savings. There are several ways of improving the performance of the vapor compression refrigeration cycle Expansion Device in type air type air conditioners are widely used in residential and commercial a very conditioning total energy consumption of a building n the performance of the system will There are several ways of vapor compression refrigeration cycle
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PID control system for air-conditioning system in residence is presented in this manuscript. The control strategy is focused on low energy consumption and thermal comfort for indoor user. The algorithm is developed to control the compressor speed at an appropriate speed according to the temperature inside the controlled area using PID controller. Software is developed to measure and interface the system with controlling the system according to the algorithm. The temperature settings are 20, 22 and 24oC with internal heat load of 0 and 1000 Watt. The results obtained proved that the technique can lower the energy consumption and increased temperature control for better thermal comfort compared to on/off controller
Modeling is a basic tool of the real system simulation in translating the Mathematical results into real life. In this study, the Modeling and simulation of photovoltaic Module type PS-P310-36 were developed, and maximum power was obtained. The output I – V and P – V curves of the model were studied and analyzed under different irradiance (200 W/m2, 400 W/m, 600 W/m2, 800 W/m, and 1000 W/m2) at a constant temperature of 25oC. The model attained maximum power of 308, 251.6, 191.4, 129.2, and 64.74 W at 1000, 800, 600, 400, and 200 W/m2 irradiance, respectively. The model results agreed with the characteristics curves of the PV module of previous similar PV studies. The proposed model will serve as quick tools for designers in obtaining the maximum power of PV at distinct irradiance. However, for a more accurate design, more information is needed.
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