scholarly journals Investigation on The Thermal Performance of Evacuated Glass-Thermal Absorber Tube Collector (EGATC) for Air Heating Application

2021 ◽  
Vol 79 (2) ◽  
pp. 48-64
Author(s):  
Zairul Azrul Zakaria ◽  
Zafri Azran Abdul Majid ◽  
Muhammad Amin Harun ◽  
Ahmad Faris Ismail ◽  
Sany Izan Ihsan ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Thermal Performance ◽  
Glass Tube ◽  
Heating System ◽  
Outlet Temperature ◽  
Water Heating ◽  
Diffuse Solar Radiation ◽  
Air Heating ◽  
Outdoor Experiment ◽  
Flat Plate Collector

Existing design of Heat-Pipe Evacuated Tube Collector (HP ETC) for solar water heating require storage tank and additional heat exchanger required for air heating application which leads to the extra spacing and costing requirement. HP ETC have better thermal performance to produce high outlet temperature than flat plate collector (FPC), especially during diffuse solar radiation. But HP ETC normally focusing on water heating system. Furthermore, HP ETC and FPC installation need to be positioned either to south or north facing to ensure the solar thermal collector absorbs more solar radiation. Meanwhile, HP ETC need to be tilt at the correct angle to maximize the performance of the system. These could lead to design limitation. The aim of this research is to develop the new design of Evacuated Glass-Thermal Absorber Tube Collector namely EGATC for drying application. It was developed from conventional HP ETC evacuated glass tube. In this study comparison result of EGATC and HP ETC performance were evaluated. The three days outdoor experiment proves that the performance of EGATC was better than HP ETC in air heating application which is provide higher outlet temperature. Based on the result, EGATC (Day 1: 50.9 oC, Day 2: 53.9 oC, Day 3: 49.2 oC) performed better with slightly higher temperature at outlet temperature compare with HP ETC (Day 1: 46.7 oC, Day 2: 50.3 oC, Day 3: 46.9 oC). It is concluded that EGATC have better performance in term of temperature different and outlet temperature as compared to HP ETC. EGATC (Day 1: 53.6%, Day 2: 50.6%, Day 3: 49.8%) also have greater efficiency in term of heat storage capability as compared to HP ETC (Day 1: 42.7%, Day 2: 41.6%, Day 3: 41.1%). Regarding energy buffer storage, EGATC have better energy storage compared to HP ETC at sudden weather change such as diffuse solar radiation during clouds. The outlet temperature of EGATC (42.3 oC) was remained slightly higher compared to HP ETC (39.9 oC) at the beginning. The outlet temperature gradually drops slower during discharging period until the end of the experiment for 15 minutes towards outlet temperature 41.1ºC and 37.2ºC for both EGATC and HP ETC with temperature difference 1.2ºC and 2.7ºC respectively.

scholarly journals Performance Estimation of Solar Flat Plate Air Heating System Using Helical Tapes

2019 ◽  
Vol 6 ◽  
Author(s):  
Jeson Wilson John ◽  
Ashwin Harikrishnan
Keyword(s):  
Flat Plate ◽  
Convective Heat Transfer Coefficient ◽  
Heating System ◽  
Performance Estimation ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
Absorber Plate ◽  
Air Heating ◽  
Temperature Efficiency ◽  
Flat Plate Collector

Solar flat plate collectors (FPC) are used for heating spaces, water heating, and many other purposes. The present technology of solar flat collectors uses vertical fins. The solar flat plate collector having absorber with vertical fins is provided with a helical tape in the fluid flow path. The absorber plate in the solar flat plate collector has an area of 100 cm x 50 cm. The solar flat plate collector has nine ducts with an area of 27.5 cm x 9.5 cm each. The helical tapes attached have a start angle of 64 deg which pass along the whole length of the duct. The helical tapes have a crosssection area of 1.5 mm x 4 mm. The pitch of the helical tapes is 100 mm. These fins have been attached between the vertical fins of the thickness of 1mm and a height of 10.5 cm. Data such as inlet temperature, outlet temperature efficiency and convective heat transfer coefficient are calculated. The mass flow rate of air is 10.28 kg/s and the air is subjected to solar radiation between 628.98 W/m2 and 708.59 W/m2. The values are noted down, and the and the efficiency is noted to have a 10% rise. The effectiveness of the solar plate collector will increase using a helical fin. A comparative analysis will be done between the conventional flat plate collector and the setup with the helical tapes. The study will show that the helical tapes in flat plate collector will be the best alternative compared to conventional flat plate collector.

scholarly journals SOCIO-ECONOMIC PERFORMANCE OF A SOLAR FLAT PLATE COLLECTOR BASED IN A HEAT PUMP WATER HEATING SYSTEM IN THE BRAZILIAN SOUTHEAST

2016 ◽  
Vol 15 (2) ◽  
pp. 08
Author(s):  
O. R. S. Rodríguez ◽  
R. N. N. Koury ◽  
A. A. T. Maia
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Heat Pump ◽  
Energy Demand ◽  
Heating System ◽  
Water Heating ◽  
Belo Horizonte ◽  
Solar Water Heating System ◽  
Flat Plate Collector ◽  
Almost All

By increasing renewable energy demand, the use of solar energy has been widely investigated over the recent years. Brazil is a privileged country in terms of the levels of receivable solar radiation in almost all over its territory. However, as there are days when there is a deficit in solar energy, because the day be cloudy or rainy days, and for this reason, solar collectors need a support to contribute to the water heating to the desired temperature. In this work, an experimental study of a heat pump operated with R-134a, as an ancillary equipment for a solar water heating system in Belo Horizonte city has been accomplished. For this project, is used a set of electrical resistances for by a power control step, simulate historical annual values of solar radiation. In the results, it was observed that is achieved through the collection of solar energy the temperature of 45°C in the reservoir only in January, and the other eleven months is necessary to use the heat pump to achieve reach that temperature. With the heat pump operating in conditions similar to real conditions gave an average annual consumption of 137.65 kWh and a cost of R$ 60.61.

scholarly journals Energy and Exergy Analysis of a Plane Reflector Integrated Photovoltaic-Thermal Water Heating System

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Prem Sagar Naik ◽  
Arun Palatel
Keyword(s):  
Solar Radiation ◽  
Thermal Water ◽  
Winter Season ◽  
Performance Testing ◽  
Electrical Energy ◽  
Heating System ◽  
Present System ◽  
Exergetic Efficiency ◽  
Water Heating ◽  
Electrical Output

A photovoltaic-thermal water heating system is a hybrid energy conversion device transforming the incident solar radiation to yield electrical energy and thermal energy. Plane reflectors are found to be a convenient option for enhancing the solar radiation incident on the collector plane. The present work investigates the performance of a photovoltaic-thermal water heater integrated with a plane reflector mounted on the top edge of the collector for the tropical climate of Calicut (11.25°N, 75.78°E). Performance testing of the system has been carried out for the winter season of the location. The variations in thermal and electrical output are studied for various inclination angles of the reflector. The system performance is evaluated on the basis of system energy efficiency and exergetic efficiency. It is observed that there is a significant enhancement in the thermal and electrical output of the system with the integration of the reflector as compared to the system without the reflector. For the present system, the reflector tilt angle in the range of 85–100° has been found to be suitable in terms of enhanced system output and exergetic efficiency for the winter conditions of Calicut.

The Application of Solar District Heating and Water Heating Integrated System in Residential Quarter

2014 ◽  
Vol 935 ◽  
pp. 97-101
Author(s):  
Zhen Zhong Guan ◽  
Chong Jie Wang ◽  
Yi Bing Xue
Keyword(s):  
Solar Radiation ◽  
District Heating ◽  
Glass Tube ◽  
Radiation Energy ◽  
Integrated System ◽  
Hot Water ◽  
Water Heating ◽  
Residential Quarter ◽  
Hot Water Supply ◽  
Heating Energy Consumption

A solar district heating and water heating integrated system has been designed and installed in a 5000m2 residential quarter. The integrated system uses vacuum glass tube solar collector to collect solar radiation energy, and uses water as heat medium. Solar energy provides almost 50% of the total heating energy consumption in winter. The inadequate part of energy can be provided by a steam heater which steam is provided by exhaust steam of the turbine from a power station nearby. The integrated system is operating automatically according to the solar radiation and working condition. Low-temperature floor radiation system is used as indoor heat radiator. At the same time, the system can provide 24h hot water supply. The integrated system has operated for 3 years, saves a large amount of energy, and receives good profit in both economical and environment.

scholarly journals Annual Thermal Performance of an Industrial Hybrid Direct–Indirect Solar Air Heating System for Drying Applications in Morelos-México

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5417
Author(s):  
Francisco Álvarez-Sánchez ◽  
Jassón Flores-Prieto ◽  
Octavio García-Valladares
Keyword(s):  
Flat Plate ◽  
Cross Flow ◽  
Heating System ◽  
Outlet Temperature ◽  
Hybrid Mode ◽  
Tube Heat Exchanger ◽  
Operation Temperature ◽  
Solar Fraction ◽  
Air Heating ◽  
Operation Modes

A theoretical–experimental annual analysis of a hybrid industrial direct–indirect solar air heating system performance for drying was conducted considering temperatures, useful energy Qu, efficiency η, and solar fraction SF. The direct solar air heating system located in Morelos, México, has flat-plate solar air collectors, and the indirect system has flat-plate solar water collectors, a thermal storage tank, a cross-flow fin, and a tube heat exchanger. A validated TRNSYS program modeled the process; the validation was carried out by comparing each component outlet temperature and useful energy with the respective experimental field data. The analysis considered annual usage over seven days a week, nine hours a day (from 09:00 to 18:00 h), and three operation modes. For the direct, indirect, and hybrid operation modes, the Qu values were 31.60, 55.19, and 75.18 MWh/yr; the annual η values were 0.44, 0.41, and 0.42; and the annual SF values were 0.45, and 0.73 for the indirect and hybrid mode, respectively. The hybridization of the direct–indirect solar air heating system increased annual performance by up to 58% in Qu and 42% in SF. The parametric analysis showed that a characteristic working nomogram of the hybrid system could be achieved, correlating the useful energy, efficiency, solar fraction, and operation temperature at a specified mass flow rate, and working temperature.

scholarly journals Hybrid system solar collectors - heat pumps for domestic water heating

2019 ◽  
Vol 23 (6 Part A) ◽  
pp. 3675-3685
Author(s):  
Simon Marcic ◽  
Rebeka Kovacic-Lukman ◽  
Peter Virtic
Keyword(s):  
Solar Radiation ◽  
Flat Plate ◽  
Heat Pump ◽  
Autonomous System ◽  
Identical Condition ◽  
Heat Pumps ◽  
Hot Water ◽  
Water Heating ◽  
Domestic Water ◽  
Flat Plate Collector

This paper deals with the use of solar energy, heat pumps, and solar system-heat pump combinations for domestic water heating. The testing of solar tiles, flat plate collectors as an autonomous system, as well as flat plate collector-heat pump and solar tile-heat pump combinations, are presented. Black-coloured water absorbs solar radiation flows through solar tiles made of transparent polymethyl methacrylate (CH2C(CH3)COOCH3). At the same time, solar tiles are used as a roof covering and as a solar radiation collector. Hot water from solar tiles or a flat plate collector is directed to the heat pump, which increases the temperature of water entering the boiler heating coil. The heat of water heated in solar tiles or in flat plate collectors serves as a source of energy for the heat pump. Since the goal was realistically evaluate the efficiency of solar tiles in comparison with the flat plate collector, extensive measurements of both systems under identical condition were carried out. The experiments were carried out in rainy, cloudy, and clear weather.

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