Based on experiments and economic analysis, sensible heat storage systems are most suitable for low-capacity AC units, such as split ACs, where the condensate volume is small. The recovered energy can be used immediately to maximize efficiency. However, these systems require larger storage volumes and may exhibit temperature fluctuations.
The integration of a heat pipe-assisted pre-cooling unit in the air handling unit (AHU) system increased condensate generation from 0.19 L/s to 0.28 L/s, yielding energy savings of approximately 10 % and a 50 % reduction in makeup water demands .
To account for these energy losses, the following assumptions are considered for energy and exergy analysis: Perfect cold insulation in the drain pipe. The heat capacity of condensate water is independent of temperature. No cold energy loss to the ambient.
Based on the results, the condensate recovery system achieved pre-cooling efficiencies ranging from 3 °C to 3.2 °C with supplied condensate water at 17℃ and 7.5 L/h. The study was extended to enhance IAQ in an air-conditioned space by periodically introducing pre-cooled fresh air in batch cycles.
Measurements were conducted using an IAQ analyzer (Testo 480) with an accuracy of ± 50 ppm up to a maximum of 5000 ppm. As shown in Fig. 11 (a), the hourly variation of average indoor CO 2 concentration was monitored in a space equipped with a packaged air conditioning system.
It was found that the total energy consumption per day of operation was 0.43 kWh (with condensate recovery) and 1.18 kWh (without condensate recovery), resulting in an energy saving of 0.75 kWh per day. The detailed annual cost analysis of the AWHX in a split AC system, with and without condensate recovery, is shown in Table 3. Table 3.
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