An evaporator has a manifold and a plurality of refrigerant tubes extending downward in the direction of gravity from the manifold. The evaporator includes at least one PCM housing engaging the upper portion of the refrigerant tube for storing a phase change material. When operating in a first opera
An evaporator has a manifold and a plurality of refrigerant tubes extending downward in the direction of gravity from the manifold. The evaporator includes at least one PCM housing engaging the upper portion of the refrigerant tube for storing a phase change material. When operating in a first operating mode, heat is transferred from the phase change material to the refrigerant to freeze and cool the phase change material. When operating in a second operating mode, heat is transferred from the refrigerant to the frozen phase change material to condense the refrigerant. The condensed refrigerant falls downwardly through the tubes and receives heat from a flow of air to cool the air and evaporate the refrigerant. The evaporated refrigerant rises upwardly back to the low pressure of the cold manifold.
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1. A method of controlling an air conditioning system (A/C system) including phase change material (PCM) thermo-syphon evaporator, a compressor, and a blower, the method comprising the steps of: measuring an evaporator out air temperature and generating a State of Charge Indicator control signal as
1. A method of controlling an air conditioning system (A/C system) including phase change material (PCM) thermo-syphon evaporator, a compressor, and a blower, the method comprising the steps of: measuring an evaporator out air temperature and generating a State of Charge Indicator control signal as a function thereof;determining if the A/C system is operating in a transient cool-down mode or a steady-state mode and generating an A/C operating mode signal as a function thereof;determining a PCM thermo-syphon evaporator charging priority;selecting a first predetermined blower voltage that is lower than a transient comfort blower, voltage when the PCM thermo-syphon evaporator charging priority is higher than a comfort maintenance priority to achieve PCM charging,selecting a second predetermined blower voltage as a function of the State of Charge Indicator control signal, the second predetermined blower voltage being lower than a steady state comfort blower, voltage when the A/C system is operating in the steady-state mode and a blower voltage override is determined to be necessary, wherein the first predetermined blower voltage is different from the second predetermined blower voltage; andoperating the blower at the selected predetermined blower voltage. 2. The method of claim 1: wherein the State of Charge Indicator control signal is calculated by integrating over time the difference between an estimated refrigerant temperature using the measured evaporator out air to form an integrated value; further comprising the step of temperature and a PCM phase freeze temperature; andapplying a calibratable factor to the integrated value so that the State of Charge Indicator control signal provides a percentage of PCM charged. 3. The method of claim 2, further comprising the steps of: initializing the State of Charge Indicator control signal to zero after a prolonged calibratable period of A/C off time; andtruncating the State of Charge Indicator control signal to the value of 1 (100%) when the integrated value is greater than 1 (100%). 4. The method of claim 1, further comprising the steps of: controlling the compressor to provide a low evaporator out air temperature satisfying an evaporator freeze prevention requirement and to simultaneously charge the PCM evaporator;raising the compressor control set point to a higher, calibratable temperature, to reduce compressor load and achieve increased energy efficiency when the State of Charge Indicator control signal indicates full charge; andestablishing a calibratable lower PCM charge threshold using the State of Charge control signal Indicator, andwhen the State of Charge Indicator control signal falls below an established lower PCM charge threshold, operating the compressor to a reduced set point intended for evaporator freeze prevention. 5. The method of claim 4: wherein the State of Charge Indicator control signal is calculated by integrating over time the difference between an estimated refrigerant temperature using the measured evaporator out air to form an integrated value; further comprising the step of temperature and a PCM phase freeze temperature; andapplying a calibratable factor to the integrated value so that the State of Charge Indicator control signal provides a percentage of PCM charged. 6. The method of claim 5, further comprising the steps of: initializing the State of Charge Indicator control signal to zero after a prolonged calibratable period of A/C off time; andtruncating the State of Charge Indicator control signal to the value of 1 (100%) when the integrated value is greater than 1 (100%). 7. A method of controlling an air conditioning system (A/C system) including a phase change material (PCM) thermo-syphon evaporator, a compressor, and a blower, the method comprising the steps of: measuring an evaporator out air temperature and generating a State of Charge Indicator control signal as a function thereof;determining if the A/C system is operating in a transient cool-down mode or a steady-state mode and generating an A/C operating mode signal as a function thereof;determining a PCM thermo-syphon evaporator charging priority;selecting a first predetermined blower voltage that is lower than a transient comfort control blower voltage, when the PCM thermo-syphon evaporator charging priority is higher than a comfort maintenance priority to achieve PCM charging,selecting a second predetermined blower voltage as a function of the State of Charge Indicator control signal, the second predetermined blower voltage being lower than a steady state comfort blower voltage, when the A/C system is operating in the steady-state mode and a blower voltage override is determined to be necessary; andoperating the blower at the selected predetermined blower voltage further comprising the steps of:measuring an ambient temperature and comparing the measured ambient temperature with two predetermined, calibratable temperature thresholds to assign the A/C to one of three temperature zones, which are a low ambient temperature zone, in which the PCM is naturally charged; a medium ambient temperature zone, in which the PCM may be charged by blower voltage override; and a high ambient temperature zone, in which PCM charging is impossible; andoverriding the steady state comfort blower voltage in the second ambient temperature zone to achieve PCM charging. 8. The method of claim 7, further comprising the step of: establishing a State of Charge Indicator threshold to manage the blower override when the State of Charge Indicator control signal is below the State of Charge Indicator threshold,initiating the blower override when the State of Charge Indicator control signal is below the State of Charge Indicator threshold, and turning off the blower override when the State of Charge Indicator control signal indicates 100% charge.
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