Optimizing energy efficiency ratio feedback control for direct expansion air-conditioners and heat pumps

A system for maximizing the measured efficiency of an air conditioner or a heat pump comprising:

• a first pressure sensor in fluid communication with a first refrigerant tubing located either between an outlet of a condenser and an inlet to an expansion device or between an outlet of a compressor and an inlet to the condenser and adapted to measure a first refrigerant pressure within the first refrigerant tubing and generate a first pressure signal;
• a first temperature sensor in thermal communication with the first refrigerant tubing and adapted to measure a first refrigerant temperature and generate a first temperature signal;
• a second pressure sensor in fluid communication with a second refrigerant tubing located between an outlet of an evaporator and an inlet of the condenser and adapted to measure a second refrigerant pressure and generate a second pressure signal;
• a second temperature sensor in thermal communication with the second refrigerant tubing and adapted to measure a second refrigerant temperature and generate a second temperature signal;
• a flow sensor in fluid communication with the first refrigerant tubing and adapted to measure a refrigerant flow rate and to generate a flow signal;
• a power voltage sensor configured to measure an electrical voltage input and generate a power voltage signal;
• a power current sensor configured to measure an electrical current input and to generate a power current signal;
• and
• a controller in electrical communication with the first temperature sensor, second temperature sensor, first pressure sensor, second pressure sensor, flow sensor, power voltage sensor, and power current sensor, adapted to receive the first pressure signal, the first temperature signal, the second pressure signal, the second temperature signal, the flow signal, the power voltage signal, and the power current signal, adapted to calculate a measured efficiency selected from the group consisting of an energy efficiency ratio, a coefficient of performance, an integrated energy efficiency ratio, and a seasonal energy efficiency ratio, and output a first voltage output signal having a voltage level dependent upon the measured efficiency.

A system for maximizing the measured efficiency of an air conditioner or a heat pump comprising:

• a first pressure sensor in fluid communication with a first refrigerant tubing located either between an outlet of a condenser and an inlet to an expansion device or between an outlet of a compressor and an inlet to the condenser and adapted to measure a first refrigerant pressure within the first refrigerant tubing and generate a first pressure signal;
• a first temperature sensor in thermal communication with a third refrigerant tubing located between an outlet of the compressor and an inlet of the condenser and adapted to measure a first refrigerant temperature and generate a first temperature signal;
• a second pressure sensor in fluid communication with a second refrigerant tubing located between an outlet of an evaporator and an inlet of the condenser and adapted to measure a second refrigerant pressure and generate a second pressure signal;
• a second temperature sensor in thermal communication with the second refrigerant tubing and adapted to measure a second refrigerant temperature and generate a second temperature signal;
• a flow sensor in fluid communication with the first refrigerant tubing and adapted to measure a refrigerant flow rate and to generate a flow signal;
• a power voltage sensor configured to measure an electrical voltage input and generate a power voltage signal;
• a power current sensor configured to measure an electrical current input and to generate a power current signal;
• and
• a controller in electrical communication with the first temperature sensor, second temperature sensor, first pressure sensor, second pressure sensor, flow sensor, power voltage sensor, and power current sensor, adapted to receive the first pressure signal, the first temperature signal, the second pressure signal, the second temperature signal, the flow signal, the power voltage signal, and the power current signal, adapted to calculate a measured efficiency selected from the group consisting of an energy efficiency ratio, a coefficient of performance, an integrated energy efficiency ratio, and a seasonal energy efficiency ratio, and output a first voltage output signal having a voltage level dependent upon the measured efficiency.