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Heat pump output indicator
| Details |
Inventors: Cornaire, James L.; Crabbs, Phillip R.;
Assignee:
Primary Examiner: Wayner; William E.
Assistant Examiner: Tanner; Harry
Attorney, Agent or Firm: Cushman, Darby & Cushman
A device for measuring the relative efficiency of a heat pump whose design efficiency increases in proportion to the outdoor temperature. Temperature sensitive diodes connected to a differential amplifier are inserted in the return air stream and supply air stream of a heat pump in order to measure the air temperature increase across the indoor coil. A third temperature sensitive diode connected to a second differential amplifier is placed outdoors in order to measure the outdoor temperature. The outputs of the first two differential amplifiers are combined and then subtracted from a fixed value signal by a third amplifier in order to produce an output which is proportional to the relative efficiency of the heat pump at the outdoor temperature. |
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DETAILED DESCRIPTION What is claimed is: 1.
A device for measuring the operating efficiency relative to its design efficiency at a given outdoor temperature, said heat pump or refrigeration device or air conditioning device having a supply air stream, a return air stream, an indoor coil, and a design efficiency which varies according to the outdoor temperature, comprising: first means for generating a first output having a characteristic which is proportional to the air temperature difference across said indoor coil; second means for generating a second output having a characteristic which increases and decreases in proportion to changes in the outdoor temperature; and means connected to said first and second generating means, for combining said first and second outputs to generate a third output having a characteristic directly proportional to the actual operating efficiency of said heat pump or refrigeration device or air conditioning device relative to the design efficiency of said heat pump or refrigeration device or air conditioning device at said given temperature.
2.
The invention described in claim 1 further comprising means, connected to said third output generating means, for displaying said relative efficiency.
3.
A device for measuring the relative efficiency of a heat pump having a supply air stream, a return air stream, an indoor coil, and a design efficiency which varies according to the outdoor temperature, comprising: means for generating a first electrical signal, the magnitude of which is proportional to the air temperature difference across said indoor coil; means for generating a second electrical signal, the magnitude of which increases and decreases in proportion to changes in the outdoor temperature; and means, responsive to said first signal and said second signal, for generating a third electrical signal, the magnitude of which is a function of the magnitude of said first signal and the magnitude of said second signal, such that said third signal has a magnitude directly proportional to the actual operating efficiency of said heat pump relative to the design efficiency of said heat pump at said outdoor given temperature
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