Condenser using improved integrated tube-in-tube heat exchanger

Abstract

The proposed useful solution involves a condenser structure utilizing an improved tube-in-tube heat exchanger for application in small-capacity vacuum drying systems. The heat exchanger is designed with a tube-in-tube structure combined with a vapor guide chamber system to extend the path of warm vapor and increase the heat exchange area between the moisture and the refrigerant. The refrigerant circulates in the gaps between the concentric copper tubes to absorb heat from the moisture stream, reducing the heat exchange surface temperature below the dew point of the vapor mixture under vacuum conditions. This increases the amount of condensed moisture recovered and improves the dehumidification efficiency. When comparing condensers using improved tube-in-tube heat exchangers and coiled tube heat exchangers (traditional type) applied in the condensation equipment of small-capacity vacuum drying systems, experimental results under mango drying conditions showed that the amount of condensed moisture recovered increased by approximately 3.4% and the heat exchange efficiency increased by approximately 5.3% compared to the traditional coiled tube heat exchanger. Therefore, this is a useful solution aimed at improving operational efficiency and extending the lifespan of vacuum pumps in small-capacity vacuum drying systems.