초록 ▼

A system and method of control of refrigerant air conditioning including a humidity input sensor, and a coolant velocity sensor, using a control system set with a set point whereby to maintain a maximum evaporator temperature set point varying to suit each heat and moisture load condition over a ran

A system and method of control of refrigerant air conditioning including a humidity input sensor, and a coolant velocity sensor, using a control system set with a set point whereby to maintain a maximum evaporator temperature set point varying to suit each heat and moisture load condition over a range of conditions compatible with high engineering standards of performance.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of controlling an air conditioning system, the air conditioning system being capable of treating a conditioned space by at least treating return air from the conditioned space in return air coils, the air conditioning system having at least one compressor and a

[ What is claimed is:] [1.]1. A method of controlling an air conditioning system, the air conditioning system being capable of treating a conditioned space by at least treating return air from the conditioned space in return air coils, the air conditioning system having at least one compressor and an evaporator and circulating a coolant through the return air coils, the return air coils having control valves capable of regulating coolant flow, and having a size that is able to be varied between a minimum and a maximum, wherein the method comprises the steps of:(a) setting desired temperature and humidity set points for the conditioned space;(b) setting desired maximum and minimum coolant velocity set points for the velocity of coolant through the return air coils;(c) measuring the conditioned space temperature and providing a temperature control signal computed from a deviation value of the conditioned space temperature from the temperature set point, the temperature deviation value being representative of changed sensible heat load requirements;(d) measuring the coolant velocity through the return air coils and providing a coolant velocity control signal computed from a deviation value of the coolant velocity from the maximum coolant velocity set point;(e) measuring the conditioned space humidity and providing a humidity control signal computed from a deviation value of the conditioned space humidity from the conditioned space humidity set point, the humidity deviation value being representative of changed evaporator temperature and latent heat load requirements;(f) in response to the temperature control signal, varying the coolant flow to the return air coils by regulating the control valves to meet the changed sensible heat load requirements;(g) in response to the coolant velocity control signal, varying the size of the return air coils such that the changed size prevents the coolant velocity from exceeding the maximum coolant velocity or from reducing below the minimum coolant velocity;(h) subsequent to a variation in size of the return air coils, providing an adjusted coolant velocity control signal; and(i) in response to the higher of the coolant velocity control signals and the humidity control signal, providing an evaporator temperature control signal to adjust the evaporator temperature to a maximum to thereby optimize input energy reduction.