Method for controlling enthalpy in air conditioning systems
First Claim
1. In an air conditioning system comprising:
- a temperature responsive sensor in the occupied space to be cooled that provides a temperature responsive control signal to activatea mechanical refrigeration compressor having a variable output capacity operatively coupled toan evaporator within the supply air duct, andan actuating means to select said capacity of said compressor, anda blower to route air in heat transfer relationship with said evaporator,and variable speed actuating means to drive said blowera method to control enthalpy and compressor output capacity in the environment of a structure, which comprises;
a. a temperature responsive means to determine the sensible temperature of the supplied air after having passed over the evaporator coil;
b. a means to generate a control signal in response to said sensible supplied air temperature including the means to vary said signal as said sensible temperature variesc. a means to supply said variable control signal in response to said sensible supplied air to said blower actuating means to vary the output of said actuating means and thus the speed of said blower, whereby said blower speed is modulated to maintain a prescribed dew point of said supplied air such that said blower speed is reduced when said determined temperature of said supplied air exceeds said dew point and said blower speed is increased when said sensed temperature of said supplied air is below said dew point;
d. a means to calculate latent heat load relative to compressor output capacity as a function of said resultant blower speed;
e. a means to generate a second control signal in response to said calculated relative latent heat load, andf. a means to supply said second control signal to said actuating means of said variable output compressor to vary said output capacity of said compressor in response to said calculated relative latent heat load
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Abstract
In an air conditioning system a method for controlling enthalpy in the environment of a structure is disclosed. The blower speed is controlled in such a manner as to maintain the prescribed dew point temperature of the air passing over the evaporator coils. When the air to be cooled contains high relative humidity, a greater quantity of latent heat is rejected into the evaporator, resulting in less sensible heat being rejected. This results in higher sensible temperature of air passing over the evaporator coils and thus the blower speed is reduced in and effort to maintain dew point. Maintaining the prescribed dew point ensures that the air in the space is continuously maintained at the optimum humidity levels without the use of humidity sensors. Enthalpy is determined by observing relative blower speed and the refrigeration compressor is modulated based on the blower speed.
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Citations
13 Claims
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1. In an air conditioning system comprising:
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a temperature responsive sensor in the occupied space to be cooled that provides a temperature responsive control signal to activate a mechanical refrigeration compressor having a variable output capacity operatively coupled to an evaporator within the supply air duct, and an actuating means to select said capacity of said compressor, and a blower to route air in heat transfer relationship with said evaporator, and variable speed actuating means to drive said blower a method to control enthalpy and compressor output capacity in the environment of a structure, which comprises; a. a temperature responsive means to determine the sensible temperature of the supplied air after having passed over the evaporator coil; b. a means to generate a control signal in response to said sensible supplied air temperature including the means to vary said signal as said sensible temperature varies c. a means to supply said variable control signal in response to said sensible supplied air to said blower actuating means to vary the output of said actuating means and thus the speed of said blower, whereby said blower speed is modulated to maintain a prescribed dew point of said supplied air such that said blower speed is reduced when said determined temperature of said supplied air exceeds said dew point and said blower speed is increased when said sensed temperature of said supplied air is below said dew point; d. a means to calculate latent heat load relative to compressor output capacity as a function of said resultant blower speed; e. a means to generate a second control signal in response to said calculated relative latent heat load, and f. a means to supply said second control signal to said actuating means of said variable output compressor to vary said output capacity of said compressor in response to said calculated relative latent heat load - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method calculate total system relative latent heat load, comprising the steps of:
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i. Calculating a ratio of compressor output to relative to said maximum compressor output capacity, ii. Calculating a ratio of blower speed to said maximum blower speed, iii. Calculating total system relative latent heat load as the product of said ratio of compressor output to relative to said maximum compressor output capacity, and said ratio of blower speed to said maximum blower speed. - View Dependent Claims (10)
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11. In an air conditioning system comprising:
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a temperature responsive sensor in the occupied space to be cooled that provides a temperature responsive control signal to activate a mechanical refrigeration compressor having a fixed output capacity operatively coupled to an evaporator within the supply air duct, and a blower to route air in heat transfer relationship with said evaporator, and variable speed actuating means to drive said blower, a method to control enthalpy in the environment of a structure, which comprises; a. a temperature responsive means to determine the sensible temperature of the supplied air after having passed over the evaporator coil; b. a means to generate a control signal in response to said sensible supplied air temperature including the means to vary said signal as said sensible temperature varies c. a means to supply said variable control signal in response to said sensible supplied air to said blower actuating means to vary the output of said actuating means and thus the speed of said blower, whereby said blower speed is modulated to maintain a prescribed dew point of said supplied air such that said blower speed is reduced when said determined temperature of said supplied air exceeds said dew point and said blower speed is increased when said sensed temperature of said supplied air is below said dew point, and d. said dew point of said supply air is between forty-seven and fifty-four degrees Fahrenheit when said air conditioning system is energized for the purpose of cooling the air in the structure. - View Dependent Claims (12, 13)
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Specification