In the present work, a double-pass Solar air-water heater has been designed for the first time to provide both hot air and hot water for using in many engineering applications. The proposed Solar collector can be a useful device for the purpose of heating spaces and providing domestic hot water, simultaneously. It is like a conventional Solar air heater but five water tubes are installed under the absorber plate with a large common surface area with the heated surface. The two-dimensional numerical simulation with the assumption of quasi-steady condition was done on a rectangular-shaped collector with a length of 1 m and a height of 0.128 m including five water tubes by solving the continuity, momentum, and energy equations for the turbulent airflow by the COMSOL Multi-physics. The effect of forced convection water flow inside the parallel tubes installed below the absorber plate is employed as a convection boundary condition in solving the air energy equation. Also, the convection boundary condition was employed on the boundary surfaces of the glass cover and insulation layer adjacent to the surroundings. Numerical simulations are carried out for the air and water mass flow rates of 0.01 kg/s and 0.03 kg/s, respectively. While the Solar heat flux lies in the range of 5001100 W/m2. In several test cases, high thermal efficiencies (69% to 74%) are computed for the proposed collector, whose value is much higher than a smooth duct Solar air heater operating under the same condition. A comparison is also made between the performances of double-pass and single-pass Solar air-water heaters and a percentage of efficiency increase about 6% was found. This value reached to 75% when this Solar collector is compared with a conventional Solar air heater.

This paper presents a new design of a spiral Solar air heater with a 90 turning of the air inside the passageway assembled between the absorber and bottom plate for the purposes of mixing process and extending the surface of heat transfer that finally leads to higher performance. To enhance the thermal efficiency, an air gap is considered at the top of the Solar collector to reduce heat loss. The proposed Solar collector is simulated numerically by the Finite Element Method using the COMSOL software. The set of governing equations for both forced and free convection turbulent air flows are solved based on the RNG k–ε turbulence model. In the energy equation solution, the effect of surface-to-surface radiation as an important phenomenon in Solar collectors is considered. Numerical results reveal a high thermal efficiency of 75% for the test case with 100  Solar heat flux and air mass flow rate of 0.01 kg/s. Compared to the conventional smooth duct Solar air heater with 35% thermal efficiency, the designed Solar collector operates with higher performance, and a more than 100% increase in thermal efficiency is achieved due to the applied technique with the limitation of pressure drop which is increases about three times in spiral Solar air heater.

This study analyzes the thermal performance of Solar thermal energy using double-pass absorber plate in Sanandaj, Iran. To this end, a mathematical model was encoded according to the energy and exergy balance equations and solved by MATLAB software. Given the environmental conditions and radiation intensity of a winter day in Sanandaj, the effects of external parameters such as radiation intensity and internal parameters like canal’ s height, inlet mass flow rate, absorber length as well as some physical parameters on the efficiency of the system were analyzed and the energy and exergy output of the system was studied. To validate the proposed model, the results obtained from numerical simulation were compared with experimental data, which showed an acceptable compatibility. Finally, the ability of the system to supply the thermal load of the building in the given day was examined and the roles of various factors in the area under thermal coverage of this system were analyzed. The obtained findings indicated that a system with an area of 3 m2 and mass rate of 250 kg/h in radiation intensity of 619 W/m 2 and temperature of 3. 45° is capable of supplying the thermal load of a space with an approximate area of 14 m.

Domestic immersion heaters used for heating cold water are characterized by an electrical resistance heating element, which is encased in a tube and directly placed in it. The most common method for heating cold water is the use of portable immersion rod water heater in an open bucket operating in operator control without a controller unit (thermostat). This paper performs an experimental evaluation of portable modifed conventional buckets of 10 l capacity. Out of ten portable modifed storages, the best three cases are discussed: non-insulated Open Plastic Bucket (OPB), non-insulated plastic bucket top surface covered with a transparent cover (CPB), and insulated plastic bucket closed with a transparent cover (ICPB). Maximum temperatures arising after two hours during OPB, CPB, and ICPB are 29. 82%, 47. 36%, and 21. 49%, respectively, compared to the initial temperatures (22. 8 C). At 14: 45 hour, CPB temperature reaches 35. 6 C, which is 17. 88% and 23. 61% higher than OPB and ICPB units. Due to the application of Solar energy in CPB at 35{50 C, net saving increased by 12. 34%, 25. 76%, 40. 73%, 57. 93%, 76. 45%, and 97. 18% from 2017 to 2022 as compared to the saving in 2016.

In the present study, a new and efficient design of a double-pass Solar air heater with converged air ducts is proposed and simulated numerically. In the designed Solar collector, the inclined position of the absorber plate regarding the glass cover and bottom plate provides converged shapes for the upper and lower air ducts, in which the accelerated flows and extra turbulence generation cause an increased rate of convection heat transfer. This concept is evaluated by numerical solution of the governing equations for air turbulent flow consisting of the conservations of mass, momentum, and energy by the finite element method using the COMSOL Multi-physics. Besides, the conduction equation is solved to compute the temperature distributions inside all solid parts. Numerical findings reveal that the increased velocity of airflow inside the converged duct causes significant convection enhancement, especially in the downstream side of airflow with a thick thermal boundary layer. This behavior leads to a considerable decrease in the absorber temperature due to a higher convection coefficient. The air outlet temperature for the studied test case with the inclined angle of   is found 3.5  more than that obtained for the base model and the percentage of efficiency increase is calculated about 10% due to using a converged duct.

The performance of a flat plate single-pass Solar air heater (SAH) modified at the entrance region of the heater was experimentally investigated. The entrance region was covered with glass cover instead of steel cover. The aim of using glass at the entrance region is increasing the heating area exposed to Solar irradiation. In addition, replacing the steel cover with glass reduces the shading effect occurred due to steel which decreases the temperature of the surface of the absorber and hence the outlet temperature of the air. Also, guide blades were placed in the entry region to ensure well air distribution on the absorber surface and hence enhancing the thermal performance of SAH. The modified SAH was compared with another one without air blades and without glass cover at the entrance. The experiments were performed at four air flow rates ranged from 0. 013 kg/sec to 0. 04 kg/sec. The modifications led to good enhancement in both the air temperature difference and the efficiency. The glazed-bladed SAH showed a good improvement in the daily thermal efficiency by 6. 72 % to 10. 5 % over the conventional heater and by 2. 16 % to 3. 25 % over the glazed SAH.

This study presents an energy-exergy analysis of a Humidification-Dehumidification (HD) Solar water desalination system. The extensive application of the HD system lies in its low energy consumption and ability to exploit Solar energy to supply all the heat energy demands. The unsteady governing equations were solved until the system reached a steady state. The simulations were done with the Euler approach to solving the system of energy balance equations numerically. This study's main goal was to investigate the effect of different configurations of the hybrid system and various operating conditions on the performance of the Solar HD water desalination system. The optimum configuration was selected based on thermodynamic and exergy analyses. The effects of important parameters such as inlet water and air mass flow rate in the humidifier and dehumidifier water temperature and mass flow rate on the system's operation were studied. This paper also explored the feasibility of the extra heat as a domestic water heater under various conditions. Based on exergy analysis, it is shown that the Solar desalination system with air-water preheater with the power of 1057. 9 W had the most exergy destruction in comparison with the two other systems (i. e., water preheater system and air preheater system with the respective exergy destructions of 901. 3 W and 75. 3 W). Comparing the values of freshwater production, exergy destruction, and exergy efficiency, the Solar system with a water preheater was selected as the optimum one.