Method and apparatus for the direct measurement of thermal energy transferred by a fluid medium
Patent 4485449 Issued on November 27, 1984. Estimated Expiration Date: 
February 1, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 1, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3617713 3639737 3700865 3854038 Integrating calorimeter Control and measuring system for flat-individual heating/cooling and procedure for the system's calibration Heat meters Selective heating and cooling energy meter Heat meters Heat-meter and flow-meter apparatus InventorAssigneeApplicationNo. 06/344542 filed on 02/01/1982US Classes:702/46, Count or pulse165/11.1, WITH ALARM, INDICATOR, SIGNAL, REGISTER, RECORDER, TEST OR INSPECTION MEANS374/39, Gain or loss of heat by heat utilizing load in path of heat exchange fluid374/41Signals combined electricallyExaminersPrimary: Gruber, Felix D.Attorney, Agent or FirmInternational ClassesG01K 17/12 (20060101)G01K 3/08 (20060101) G01K 17/00 (20060101) G01K 3/00 (20060101) Foreign Application Priority Data1981-09-23 ITAbstractIn the direct measurement of thermal energy transferred in heating or air conditioning installations, the difference between voltages from outflow and return flow temperature sensors is integrated during a first timing period and then discharged during a second timing period with a constant current to operate a gate passing a number of pulses proportional to the voltage difference. The first and second timing periods are initiated by impulses from a volume flow sensor. During non-timing-period intervals a reference voltage capacitance is set by integrating circuit feedback.In collection of data from a plurality of thermal energy transfer meters, inputs from the meters are scanned at rates greatly exceeding the pulse frequencies to increment or decrement the count in digital filter stages of corresponding pairs of counters depending upon whether sensed voltage levels are opposite or equal to the last accepted voltage level as recorded in a most significant stage of the digital filter.Other References
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