The Effect of Upper-Heating System in Solar Water Storage Tank

Abstract

Thermal strati¯cation in the water storage tank of solar heating system is essential to increase the collection e±ciency. We previously investigated the strati¯cation performance of side-heating system, where the hot water returning from the collector heats up the side wall of storage tank. Subsequently, we studied an evolved heating system for further improvement, where we added an upper-heating to the side-heating. Here we thoroughly examine the strati¯cation performance of the evolved heating system using TRNSYS-based simulation. As the essential result, contrary to expectation, evolved system does not show substantial improvement of collection e±ciency compared to side-heating. However, we con¯rm that evolved system excels in the useful energy.

Greenhouse Gas Reduction Effect of Solar Energy Systems Applicable to High-rise Apartment Housing Structures in South Korea

“…The most basic method is a heat exchange coil arranged only in the lower part of the heat storage tank and a constant flow rate. Contrary to this lower installation of heat exchange coil, our previous studies showed that the upper and side heating of the storage tank is more effective for higher stratification performance [26], as upper heating increases the temperature difference between the top and bottom of the storage tank. In such system, when the solar radiation condition is not strong, it can be seen that operating only the bottom coil or reducing the flow rate improves the solar energy collection efficiency by about 7%.…”

2E (Energy and Exergy) Analysis of ET-CPC Solar Collector Integrated with Different Configuration of Thermal Storage System

“…Dependence of solar harnessing mainly on a kernel solar collector that transfers the solar radiation into heat energy is well known (Son et al, 2014). Among the available solar collectors, a flat plate collector and the evacuated tube are being used for several applications due to ease in installation in buildings along with relatively low operating and maintenance costs.…”