| 摘要 |
An apparatus is described for heating or cooling water in swimming pools. The apparatus takes ambient air and pumps it through a submerged, perforated manifold tube. Heat is exchanged between the air bubbles and water as the bubbles ascend to the pool surface. Operational control is maintained through a pair of thermostatic switches. A sensor is situated within the water to detect the water temperature and another sensor is exposed to the atmosphere for detecting the ambient air temperature. A control operatively connects the sensors and operates in response to variations in the temperature differential between the air temperature and the water temperature to activate or deactivate the air pump. The control is adjustable, enabling the user to select a desirable operational range for the air pump and thereby control the temperature of the water in his pool. When the ambient air temperature reaches a prescribed value, a switch is operated to activate the air pump. When the water becomes heated to a prescribed value, another switch is operated to deactivate the air pump. The pool water may also be cooled by pumping cool ambient air through the manifold tube. The switching modes normally used for operating the pump are reversed for cooling the water so the pump will be activated when the ambient air drops below a prescribed temperature and deactivated when the water temperature drops below a prescribed level.
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