2020 Volume 45 Issue 284 Pages 29-35
This study experimentally evaluates a dehumidifying and reheating air conditioning unit with a built-in heat pipe designed to process outside air without using primary energy for pre-cooling or reheating. In our previous report, in addition to evaluating the reduction effect of the cooling of the cold water coil from performance tests in the laboratory, we examined the operational results in a building where the system was in actual operation to confirm the normal operation of the dehumidifying and reheating cycle. In this report, we evaluate the heat pipe operation and the energy-saving effect over a year, based on measurement data from a building in which the system is in operation. Based on these measurements, we confirm that while the heat pipe operates when the pre-cooling coil inlet temperature is 15℃ or more, it does not operate when the air conditioning is stopped or during the heating operation. Considering the resistance loss due to installation of the heat pipe, the annual air conditioner load is reduced by 34.4% for the Western Japan grid and 39.9% for the Eastern Japan grid, and is this considered to have an energy-saving effect over the year.
