Upgrading of Low Temperature Solar Heat with Cascade Vapor Compression and Absorption Heat Pump
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2013, Vol 3, Issue 4
Abstract
The objective of this project is to study a method to upgrade a low temperature heat form solar energy by cascaded vapor compression heat pump/absorption heat pump. The modified system could be used to produce high temperature heat such as high temperature hot water with full replacement or partial support for boiler in hotel, hospital and other related industries. The input energy comes from solar energy which is clean and friendly to environment. In this study, a solar water heating system was designed and constructed. The unit had 10 units of flat-plate solar collectors (1 unit = 2.3 m2) each generated hot water at a temperature range of 40-60 oC and a storage tank of 1,500 liter. After that these hot water temperature was upgraded by 2 units of R-123 vapor compression heat pumps each having a heating capacity of 10 kW. Hot water at a higher temperature of around 60-80 oC was produced and kept in a 200 liter hot water tank. Then a 10 kW water-Libr absorption heat pump upgraded the final hot water temperature to be around 90-110 oC kept in a 200 liter tank. Since the water temperature might be over the boiling point then glycol was mixed in the water with a concentration of around 40%, Mathematical correlations of the related parameters from the experimental data could be set up and these could be used to predict outputs of the studied system under various operating conditions. The final outputs such as the system COP and the final hot water temperature simulated by the models were found to be close with those of the experimental results. From the economic results, the modified system was used to partially support a boiler for generating hot water at 5 Ton/d compared up to fully support at 35 Ton/d. For the partially support, the energy saving and the payback period for the modified system were around 2,675,434 Baht/y (1 USD = 30.6535 Baht) and 1 year 2 months, respectively. The payback was longer with the higher load of the system.
Authors and Affiliations
Nattaporn Chaiyat
Keywords
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