Due to use of alternative energy sources and energy efficient operation, heat pumps come into prominence in recent years. Especially in solar-assisted heat pumps, sizing the required system is difficult and arduous task in order to provide optimum working conditions. Therefore, in this study solar assisted indirect expanded heat pump space heating system is simulated and the results of the simulation are compared with available experimental data in the literature in order to present reliability of the model. Solar radiation values in the selected region are estimated with the simulation. The case study is applied and simulation results are given for Antalya, Turkey. Collector type and storage tank capacity effects on the consumed power of the compressor, COP of the heat pump and the overall system are estimated with the simulation, depending on the radiation data, collector surface area and the heating capacity of the space. Exergy analysis is also performed with the simulation and irreversibility, improvement potentials and exergy efficiencies of the heat pump and system components are estimated.
The effect of ultrasonic treatment during casting of a hypereutectic Al-Si alloy (Etial 195) containing 18%Si on the microstructure and some mechanical properties has been investigated. For this purpose, a steel mould was placed inside an ultrasonic bath, and molten aluminium alloy at 740uC was poured into the mould. Ultrasound was applied to the casts from the external side of the mould during solidification. Cooling curves were obtained by measuring and recording the temperature of the cast. The samples were subjected to X-ray diffraction analysis and hardness, wear and impact tests. The microstructure of the samples was examined by optical and scanning electron microscopies and investigated statistically with image analysis software. Hardness values increased from 49?8-52?3 to 57?7-61?6 HRB upon ultrasonic treatment during solidification. The application of ultrasonic vibration to the cast from the external side of the mould resulted in modification of the microstructure and improvement in mechanical properties.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.