Abstract
In recent years, solar water heating technology has got the major importance in water heating applications. For the efficient and effective working of solar water heaters, storage of the hot water is the main issue in this water heating technologies. This paper mainly presents the exergy and efficiency comparison between the solar flat plate water heater and evacuated tube water heater. A five level stratified thermal storage tank is designed and developed for this analysis. At each level of the tank, temperature of the water is collected for each one hour interval from 9:00 to 16:00 hours in both cases and the overall exergy and efficiency of the two water heaters were calculated. The average efficiency of all the levels for flat plate and evacuated tube collectors are 7.91% and 8.20% respectively. The overall system efficiency is obtained as 39.54% for flat plate and 41.00% for evacuated tube solar collector. At each level exergy is calculate for both systems and the average exergy of all the levels for flat plate collector is 4.243 kW and for evacuated tube solar collector is 4.371 kW.
Highlights
Solar water heating technology has got the major importance in water heating applications throughout the world countries
The experiment was conducted at School Renewable Energy Technology (SERT), Naresuan University, Thailand in the month of March 2016
The exergy at each level of thermal storage tank for flat plate solar water heater and evacuated tube collector is mentioned in the above figure 4
Summary
Solar water heating technology has got the major importance in water heating applications throughout the world countries. Many renewable energy systems and technologies were developed for water heating applications to reduce the fossil fuel consumption and greenhouse house gases emissions into the environment. Based on the type of solar collector, there are two main classifications of solar water heaters namely flat plate solar water heaters and evacuated tube solar water heaters [1]. Based on the area of application and the range of operating temperature solar water heaters are classified as swimming pool water heaters, built in storage type water heaters, domestic solar water heaters and large size solar water heaters for industrial and community applications [2]. Evacuated tube solar collectors are further classified as direct flow tubes and heat pipe tubes. To reduce and eliminate conduction and convection losses respectively, evacuated tube collectors consist of a row of parallel evacuated glass tubes [4]
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