TEMPERATURE CONTROL
A temperature controller and a method of determining an amount of thermal energy stored in thermal storage media in a temperature controlled thermal storage reservoir in which a temperature of the thermal storage media can vary and in which the thermal storage media is to be maintained at a desired temperature, which method includes periodically measuring a temperature of the thermal storage media, calculating a rate of temperature change from the desired temperature of the thermal storage media, retrieving previously stored data representing an amount of thermal energy stored in the thermal storage media and adding the rate of temperature change multiplied by a predefined constant value to the previously stored data.