Thermal stratification in vertical mantle heat-exchangers with application to solar domestic hot-water systems
- 31 July 2004
- journal article
- Published by Elsevier BV in Applied Energy
- Vol. 78 (3), 257-272
- https://doi.org/10.1016/j.apenergy.2003.09.002
Abstract
Experimental and numerical investigations of vertical mantle heat-exchangers for solar domestic hot-water (SDHW) systems have been carried out. Two different mantle inlet positions are investigated. Experiments based on typical operation conditions are carried out to investigate how the thermal stratification is affected by different positions of the mantle inlet. The heat transfer between the solar collector fluid in the mantle and the domestic water in the tank is analysed by CFD-simulations. Furthermore, side-by-side laboratory tests have been carried out with SDHW systems with different mantle inlet-positions. It is shown that for a high inlet-temperature to the mantle, it is an advantage to have the inlet located at the top and for a low inlet temperature it is an advantage to have the inlet moved down. Marketed tanks have typically the mantle inlet located at the top of the mantle. The side-by-side laboratory tests indicate that it is an advantage to move the inlet down from the top.Keywords
This publication has 7 references indexed in Scilit:
- Some aspects concerning modelling the flow and heat transfer in horizontal mantle heat exchangers in solar water heatersInternational Journal of Energy Research, 1999
- Characteristics Of Vertical Mantle Heat Exchangers For Solar Water HeatersSolar Energy, 1999
- Mixed Convection Heat Transfer and Pressure Drop Correlations for Tube-ln-Shell Thermosyphon Heat Exchangers With Uniform Heat FluxJournal of Solar Energy Engineering, 1998
- Analysis of horizontal mantle heat exchangers in solar water heating systemsSolar Energy, 1998
- Evaluation of storage configurations with internal heat exchangersSolar Energy, 1998
- A review of low-flow, stratified-tank solar water heating systemsSolar Energy, 1989
- IS LOW FLOW OPERATION AN ADVANTAGE FOR SOLAR HEATING SYSTEMS?Published by Elsevier BV ,1988