Patent ID: 7637315
Filing Date: 2009-12-29
Classification: G05D

Abstract:
1. A constant temperature liquid circulating device having a conduit for delivering circulating liquid temperature-controlled at a constant temperature due to a heat exchanger by a pump and a circulating flow channel for allowing the circulating liquid to circulate therein, the circulating flow channel formed by respectively connecting a discharge port and a return port of the conduit to both ends of a piping that defines a flow channel of the circulating liquid in the external device whose temperature is controlled by the circulating liquid, the liquid circulating device comprising: a flow amount sensor provided in the conduit; temperature sensors for detecting a discharge temperature (T a controller configured to control the flow amount and the temperature of the circulating liquid according to a heat load of the external device obtained on the basis of the outputs from the sensors the controller configured to calculate a heat load of the external device from a difference between discharge and return temperatures (T