Portable calculator for refrigeration heating and air conditioning equipment service
First Claim
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1. A conversion and measuring apparatus characterized by:
- a flow-energy rate conversion means for determining the energy rate supplied by a fuel flow said conversion means including;
selection means for selecting units of fuel flow;
input key means;
a timer mechanism constructed to be turned on and off by the input key means to measure elapsed time for said selected units of fuel flow;
calculation means for determining the energy rate based on said elapsed time and said selected units of fuel flow; and
a display means for displaying said energy rate.
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Abstract
A calculator apparatus 10 includes the standard calculator mode and several other modes functions namely; a pressure-temperature conversion, a temperature-to-pressure conversion based on refrigerant, a relative humidity reading based on input of the dry bulb and wet bulb temperature; and a flow-energy rate conversion mode based upon a selected fuel meter dial and Metric or English units. In addition, a Fahrenheit-to-centigrade conversion and a centigrade-to-Fahrenheit conversion functions are incorporated. The calculator includes a keyboard 18, a microprocessor 16, a timer 26, a power source 12, a switch 14 and a display screen 22.
105 Citations
7 Claims
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1. A conversion and measuring apparatus characterized by:
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a flow-energy rate conversion means for determining the energy rate supplied by a fuel flow said conversion means including; selection means for selecting units of fuel flow; input key means; a timer mechanism constructed to be turned on and off by the input key means to measure elapsed time for said selected units of fuel flow; calculation means for determining the energy rate based on said elapsed time and said selected units of fuel flow; and a display means for displaying said energy rate.
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2. In as calculator apparatus a defined in claim further characterized by:
a temperature conversion means including input means for inputting a temperature in one mode of measurement and converting said inputted temperature in one mode of measurement into a temperature in another mode of measurement.
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3. A conversion and measuring apparatus characterized by:
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a flow-energy rate conversion means for determining the energy rate supplied by a fuel flow said conversion means including; selection means for selecting units of fuel flow; a timer mechanism constructed to be turned on and off to measure elapsed time for said selected units of fuel flow; calculation means for determining the energy rate based on said elapsed time and said selected units of fuel flow; a display means for displaying said energy rate; and a humidity conversion mode means for determining the relative humidity which is displayed on said display means wherein a dry bulb temperature and wet bulb temperature are inputted for determining the relative humidity which is displayed on said display means.
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4. In a calculator apparatus having a keyboard for entering numbers and arithmetic operators, a display screen, a power source, and an on/off switch, the improvement characterized by:
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a temperature-to-pressure conversion mode wherein a temperature is inputted via said keyboard and a refrigerant is selected via said keyboard to determine the corresponding pressure; a pressure-to-temperature conversion mode wherein a pressure is inputted via the keyboard and a refrigerant is selected via said keyboard for determining the corresponding temperature; a humidity conversion mode wherein a dry bulb temperature and a wet bulb temperature are inputted via the keyboard for determining the corresponding relative humidity; an energy flow rate conversion mode for calculating an energy rate supplied by a fuel flow, said conversion mode including a fuel unit selection means for selecting one of several units of flow of metered fuel via said keyboard and a timer mechanism constructed to be activated and shut off via said keyboard to measure elapsed time for said select units of fuel flow; a mode selection means for selecting one of said modes; and said display screen for indicating one of said corresponding pressure, said corresponding temperature, said relative humidity and said energy rate corresponding to the selection of said mode selection means. - View Dependent Claims (5, 6, 7)
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Specification