Investigation and Improvement of Thermal Performance of a Solar Air Heater Using Extended Surfaces Through the Phase Change Material

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
S. M. Shalaby ◽  
A. E. Kabeel ◽  
E. El-Bialy ◽  
M. K. Elfakharany
Keyword(s):  
Air Temperature ◽  
Ambient Air ◽  
Paraffin Wax ◽  
Solar Air Heater ◽  
Absorber Plate ◽  
Air Heater ◽  
Hot Air ◽  
Extended Surface ◽  
Extended Surfaces ◽  
Corrugated Plates

Abstract Low thermal conductivity is the main drawback of using paraffin wax as a latent heat thermal storage material in the solar air heater (SAH). In order to overcome this drawback, an absorber plate with extended surfaces through the paraffin wax was used. Two extended surface absorbers were used: a flat plate attached with downward fins and a V-corrugated plate. For the purpose of comparison, the SAH integrated with paraffin wax was tested using three proposed types of the absorber plate: flat, downward finned, and V-corrugated plates. The results showed superiority of the downward finned plate during the day. But the V-corrugated SAH remains the best choice for the applications in which the hot air is mostly needed during night as it is continuously operated for 7 h after sunset with the outlet air temperature of 8–11 °C more than the ambient air temperature.

scholarly journals Design of Hybrid Industrial Solar Drying Unit

2019 ◽  
Vol 4 (1) ◽  
pp. 24-31
Author(s):  
Haider A. Gadir Elbasher ◽  
Babiker Karama Abdalla ◽  
Adil Ali Mohamed
Keyword(s):  
Static Condition ◽  
Ambient Air ◽  
Solar Air Heater ◽  
Outlet Temperature ◽  
Absorber Plate ◽  
Is Success ◽  
Set Point ◽  
Pilot Unit ◽  
Air Heater ◽  
Hot Air

This study done for designing  industrial solar air heater drying unit with tow part of experimental steps(selecting solar air hater  type and other par for controlling outlet temperature through mixing hot and ambient air through static mixture) ., The experiment done for 6 six days for each type using fabricated glass covered corrugated solar air heater with tow possibility of modifications  one of them with fixed absorber plate defined as type one and other one tested with removed absorber  plate which defined as type two  experiments done with full  accessory (air supply fans, temperature mea with same test study using device, fresh air motor controlling RPM and fabricated static mixture. The drying temperature range (45 C to 55 C).Before testing pilot unit calculation of predicted hot air temperature was done for validity of unit then the experiments has been made with pilot unit of solar air heater with fresh air steam and static condition, the result show that solar air heater type one is better for stable results for out let temperature and suitable for working. also the experiments show that, the presented value of temperature of hot mixed air of SAH type one have fitness with set point of controller 90% for day one and day two but for SAH type two the present value haven’t fitness with set point, the reading either high or low than the set temperature   , for the other part of study prove that mixing hot air from solar air heater and fresh ambient air is success and control system working properly for the propellant drying process.

scholarly journals Experimental Studies on a Solar Air Heater Having V-Corrugated Absorber Plate with Obstacles Bent Vertically

2014 ◽  
Vol 493 ◽  
pp. 86-92 ◽  
Author(s):  
Ekadewi A. Handoyo ◽  
Djatmiko Ichsani ◽  
Prabowo ◽  
S. Sutardi
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Flat Plate ◽  
Air Temperature ◽  
Temperature Rise ◽  
Experimental Studies ◽  
Bottom Plate ◽  
Solar Air Heater ◽  
Absorber Plate ◽  
Air Heater

A solar air heater (SAH) is a simple heater using solar radiation that is useful for drying or space heating. Unfortunately, heat transfer from the absorber plate to the air inside the solar air heater is low. Some researchers reported that obstacles are able to improve the heat transfer in a flat plate solar air collector and others found that a v-corrugated absorber plate gives better heat transfer than a flat plate. Yet, no work of combining these two findings is found.This paper describes the result of experimental study on a SAH with v-corrugated absorber plate and obstacles bent vertically started from 80oto 0owith interval 10oon its bottom plate. Experiments were conducted indoor at five different Reynolds numbers (1447 Re 7237) and three different radiation intensities (430, 573, and 716 W/m2).It is found that the obstacles improve SAH performance. Both the air temperature rise and efficiency increase with inserting obstacles bent at any angle vertically. Unfortunately, the air pressure drop is increasing, too. Obstacles bent vertically at smaller angle (means more straight) give higher air temperature rise and efficiency. However, the optimum angle is found 30o. The air temperature rise and efficiency will be 5.3% lower when the obstacles bent 30oinstead of 0o, but the pressure drop will be 17.2% lower.

scholarly journals An experimental investigation of performance of a double pass solar air heater with thermal storage medium

2015 ◽  
Vol 19 (5) ◽  
pp. 1699-1708 ◽  
Author(s):  
Hafiz Ali ◽  
Arslan Bhatti ◽  
Muzaffar Ali
Keyword(s):  
Experimental Investigation ◽  
Thermal Storage ◽  
Paraffin Wax ◽  
Maximum Efficiency ◽  
Solar Air Heater ◽  
Storage Medium ◽  
Absorber Plate ◽  
Double Pass ◽  
Air Heater ◽  
Useful Heat

The performance of a double pass solar air heater was experimentally investigated using four different configurations. First configuration contained only absorber plate whereas copper tubes filled with thermal storage medium (paraffin wax) were added on the absorber plate in the second configuration. Aluminum and steel rods as thermal enhancer were inserted in the middle of paraffin wax of each tube for configurations three and four respectively. Second configuration provided useful heat for about 1.5 hours after the sunset compared to first configuration. Configurations three and four provided useful heat for about 2 hours after the sunset. The maximum efficiency of about 96% was achieved using configuration three (i.e. using Aluminum rods in the middle of copper tubes filled with paraffin wax).

scholarly journals EXPERIMENTAL STUDY AND ANALYSIS OF SOLAR AIR HEATER USING OF VARIOUS INLET TEMPERATURES

2017 ◽  
Vol 5 (10) ◽  
pp. 76-80
Author(s):  
Deeksha Vishwakarma ◽  
Jyoti Kale
Keyword(s):  
Experimental Study ◽  
Solar Radiation ◽  
Air Temperature ◽  
Plate Glass ◽  
Experimental Setup ◽  
Solar Air Heater ◽  
Outlet Port ◽  
Inlet Port ◽  
Air Heater ◽  
Hot Air

In this paper, we are make the experimental setup and assembled the various components such as, flats plate glass, wood, collector, inlet port and outlet port. The collector are generated the hot air with the help solar radiation. The collector are aching the air from inlet port and finally hot air are out through outlet port. We are measured the maximum outlet hot air Temperature in °C.

Thermal Performance Analysis of a Rectangular Longitudinal Finned Solar Air Heater With Semicircular Absorber Plate

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Satyender Singh ◽  
Prashant Dhiman
Keyword(s):  
Thermal Performance ◽  
Numerical Solutions ◽  
Solar Air Heater ◽  
Duct Flow ◽  
Balance Equations ◽  
Absorber Plate ◽  
Ansys Fluent ◽  
Air Heater ◽  
Glass Cover ◽  
Good Agreement

Thermal performance of a single-pass single-glass cover solar air heater consisting of semicircular absorber plate finned with rectangular longitudinal fins is investigated. The analysis is carried out for different hydraulic diameters, which were obtained by varying the diameter of the duct from 0.3–0.5 m. One to five numbers of fins are considered. Reynolds number ranges from 1600–4300. Analytical solutions for energy balance equations of different elements and duct flow of the solar air heater are presented; results are compared with finite-volume methodology based numerical solutions obtained from ansys fluent commercial software, and a fairly good agreement is achieved. Moreover, analysis is extended to check the effect of double-glass cover and the recycle of the exiting air. Results revealed that the use of double-glass cover and recycle operation improves the thermal performance of solar air heater.

Numerical analysis of a solar air heater with circular perforated absorber plate

Solar Energy ◽  
2021 ◽  
Vol 215 ◽  
pp. 416-433
Author(s):  
Shreyas P. Shetty ◽  
N. Madhwesh ◽  
K. Vasudeva Karanth
Keyword(s):  
Numerical Analysis ◽  
Solar Air Heater ◽  
Absorber Plate ◽  
Air Heater
Sign in / Sign up

Export Citation Format

Share Document