System and Method For Charging HVAC System
a technology for charging hvac systems and charging methods, applied in refrigeration and liquidation, lighting and heating apparatus, refrigeration machines, etc., can solve the problems of inaccurate charging of hvac systems, failure of charging hvac systems to properly charge hvac systems,
Inactive Publication Date: 2011-09-15
TRANE INT INC
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Benefits of technology
The patent text describes different methods for charging an HVAC system based on factors like liquid line temperature, suction line pressure, and ambient outdoor temperature. The technical effects of these methods include improving the efficiency of the HVAC system and ensuring optimal performance under different conditions.
Problems solved by technology
While there are many well-known methods of providing a mass of refrigerant to HVAC systems (or methods of “charging” an HVAC system), existing methods may fail to charge an HVAC system accurately even though the methods are adhered to strictly.
The above-listed methods of charging an HVAC system may fail to properly charge an HVAC system due to the environment in which the HVAC system operates (i.e., temperatures, humidity, and / or other environmental factors), due to variations in the physical configuration of the HVAC system as actually installed compared with the physical configuration assumed to be adhered to by the methods (i.e., prescribed distances between components and / or prescribed height differences between components), and / or due to variations in actual operation of the HVAC system as compared to the operation assumed to be adhered to by the methods (i.e., providing prescribed air flow across particular heat exchangers).
Method used
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[0016]Some methods of charging HVAC systems fail to properly charge HVAC systems even when the methods are adhered to strictly. Further, some HVAC systems continue to perform substantially as desired even though the HVAC systems are not appropriately charged with refrigerant. For example, some HVAC systems comprising spine fin heat exchangers and / or other heat exchangers having substantially traditional total refrigerant volumes may continue to perform, albeit less effectively, in overcharged states (more than an optimum amount of refrigerant) or undercharged states (less than an optimum amount of refrigerant) that result from being charged according to a subcooling charging method.
[0017]However, some HVAC systems that comprise micro-channel heat exchangers are less likely to perform substantially as desired when inappropriately charged, even when the charge is only slightly greater than or slightly less than an appropriate mass of refrigerant. Accordingly, there is a need for a sys...
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A method of charging an HVAC system by determining a relationship between a liquid line temperature of the HVAC system, a suction line pressure of the HVAC system, and an ambient outdoor temperature of the HVAC system. A method of charging an HVAC system by adjusting a mass of refrigerant in the HVAC system to approach a target minimum liquid line temperature. A method of charging an HVAC system by testing the HVAC system according to at least three sets of test parameters, two of the three sets of test parameters comprising testing the HVAC system at substantially a same outdoor ambient temperature and at least one of the remaining set of test parameters comprising testing the HVAC system at a different outdoor ambient temperature.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]Not applicable.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not applicable.REFERENCE TO A MICROFICHE APPENDIX[0003]Not applicable.BACKGROUND[0004]Heating, ventilation, and air conditioning systems (HVAC systems) may utilize refrigerants in thermodynamic processes to cool and / or heat fluids for use in conditioning a temperature and / or a humidity of spaces serviced by the HVAC systems. Some HVAC systems may comprise substantially closed refrigeration systems that perform better when a particular mass of refrigerant is contained within the substantially closed refrigeration system. The particular mass of refrigerant or so-called “charge” of refrigerant needed by a particular HVAC system to perform well may be dependent upon the volume and / or configuration of various components of the HVAC system that accept refrigerant, including any refrigerant conduits used to join the various components of the HVAC system. It is kn...
Claims
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IPC IPC(8): F25B45/00F24F11/76
CPCF25B2345/001F25B45/00
Inventor DENTON, DARRYL E.
Owner TRANE INT INC