| 摘要 |
<p>A duct system has a first duct guiding warm air downward from a warm air production source provided in an upward position and having warm air-feeding openings in the middle of the first duct, a second duct guiding cold air upward from a cold air production source provided in a downward position and having cold air-feeding openings in the middle of the second duct, and a third duct for connecting the warm air production source and the cold air production source and having recovery openings in the middle of the third duct. The duct system is a simple duct system where warm air and cold air can be independently fed and recovered through the common duct. As a consequence, a receiving device, such as a showcase, that is compact and has high heat exchange efficiency can be provided.</p> |
