Air conditioning system with selective regenerative thermal energy feedback control

• US 8,359,882 B2
• Filed: 04/14/2008
• Issued: 01/29/2013
• Est. Priority Date: 04/13/2007
• Status: Expired due to Fees

• Current Assignee: Abdullah A. Al-Eidan
• Original Assignee: Abdullah A. Al-Eidan
• Inventors: Al-Eidan, Abdullah A.
• Primary Examiner(s): Jules, Frantz
• Assistant Examiner(s): BAUER, CASSEY D
• Application Number:
  US12/102,448
• Publication Number:
  US 20080314064A1
• Time in Patent Office: 1,751 Days
• Field of Search: 625/13, 621/13
• US Class Current: 62/513
• CPC Class Codes: F24T 10/00 Geothermal collectors
• CPC Class Codes: F25B 13/00 Compression machines, plants or systems, with reversible cycle defrosting cycles F25B47/02
• CPC Class Codes: F25B 2313/02742 using two four-way valves
• CPC Class Codes: F25B 2600/02 Compressor control
• CPC Class Codes: F25B 2600/11 Fan speed control
• CPC Class Codes: F25B 2600/2515 Flow valves
• CPC Class Codes: F25B 2700/21152 at the discharge side of the compressor
• CPC Class Codes: F25B 2700/21163 of the refrigerant at the outlet of the condenser
• CPC Class Codes: F25B 2700/21174 of the refrigerant at the inlet of the evaporator
• CPC Class Codes: F25B 2700/21175 of the refrigerant at the outlet of the evaporator
• CPC Class Codes: F25B 40/00 Subcoolers, desuperheaters or superheaters
• CPC Class Codes: F25B 41/22 between evaporator and compressor
• CPC Class Codes: F28D 7/024 the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
• CPC Class Codes: F28D 7/106 consisting of two coaxial conduits or modules of two coaxial conduits
• CPC Class Codes: Y02E 10/10 Geothermal energy

Abstract

An air conditioning and heating system includes an condenser, an expansion valve, an evaporator and a compressor interconnected in a closed loop system, and a motor for driving the compressor. The system also includes a refrigerant disposed within the closed loop system. The compressor compresses the refrigerant and pumps the refrigerant through the system. The system also includes one or more feedback loops to reduce the temperature (pre-cool) the refrigerant before it reaches the expansion valve in the cooling mode and the same or a different heat exchanger in the heating mode. The additional heat exchangers are placed in the loop to reduce the electric energy being used.

Claims

1. An air conditioning system comprising:

a condenser, an expansion valve, an evaporator and a compressor interconnected in a closed loop system;

a refrigerant disposed in said closed loop system and a motor for driving said compressor to compress said refrigerant and pump said refrigerant through said condenser, said expansion valve, said evaporator and back to said compressor during a cooling cycle;

a heat exchanger disposed in said closed loop system between said condenser and said expansion valve for pre-cooling the refrigerant before it flows into said expansion valve, and a feedback loop in said closed loop system for conducting refrigerant from said evaporator back through said heat exchanger for raising the temperature of the refrigerant before returning the refrigerant to said compressor;

a solenoid valve between said evaporator and said heat exchanger; and

a first blocking valve between said evaporator and said compressor and a second blocking valve between said heat exchanger and said compressor and an electronic control for adjusting and/or throttling the cold refrigerant flow;

a pair of fans and wherein a first of said pair of fans cools refrigerant in said condenser and a second of said pair of fans cools refrigerant in said evaporator;

wherein said first of said pair of fans is a variable speed counter rotating fan;

wherein said compressor is a multiple compressor for reducing peak energy under part load conditions;

wherein said first and second fans and compressor are operated by D.C. motors; and

,

a safety high pressure system to override the solenoid valve and close it to thereby reduce the pressure on said compressor;

wherein each of said condenser, expansion valve, heat exchanger, evaporator and compressor have an inlet and an outlet for receiving and discharging refrigerant and which includes a plurality of thermocouples for temperature measurement within said system and wherein a first of said thermocouples is disposed between the outlet of said compressor and said inlet of said condenser, said second of said thermocouples is disposed between said outlet of said condenser and said inlet of said heat exchanger, a third of said thermocouples is disposed between said output of said heat exchanger and said input of said evaporator valve, a fourth of said thermocouples disposed between said output of said evaporation valve and said inlet of said evaporator, a fifth of said thermocouples disposed between said outlet of said evaporator and said solenoid valve and a sixth of said thermocouples disposed between said second blocking valve and said input of said compressor; and

,

said air conditioning system further comprising a second feedback loop, wherein the heat exchanger is two heat exchangers and wherein said compressor is an accumulator compressor system; and

which

includes an additional thermocouple for measuring the ambient temperature and an electronic control board for inputting a target temperature and wherein the efficiency of the system is improved by a feedback determined by the ambient temperature and the target temperature; and

a four-way valve for changing the flow of refrigerant between the two modes of operation, one mode with and one mode without a feedback loop.

2. An air conditioning system comprising:

a condenser, an expansion valve, an evaporator and a compressor interconnected in a closed loop system;

a refrigerant disposed in said closed loop system and a motor for driving said compressor to compress said refrigerant and pump said refrigerant through said condenser, said expansion valve, said evaporator and back to said compressor during a cooling cycle;

a heat exchanger disposed in said closed loop system between said condenser and said expansion valve for pre-cooling the refrigerant before it flows into said expansion valve, and a feedback loop in said closed loop system for conducting refrigerant from said evaporator back through said heat exchanger for raising the temperature of the refrigerant before returning the refrigerant to said compressor;

a solenoid valve between said evaporator and said heat exchanger; and

a first blocking valve between said evaporator and said compressor and a second blocking valve between said heat exchanger and said compressor and an electronic control for adjusting and/or throttling the cold refrigerant flow;

,

a pair of fans and wherein a first of said pair of fans cools refrigerant in said condenser and a second of said pair of fans cools refrigerant in said evaporator;

wherein said first of said air of fans is a variable speed counter rotating fan;

wherein said compressor is multiple compressor for reducing peak energy under part load conditions;

wherein said first and second fans and compressor are operated by D.C. motors; and

,

a safety high pressure system to override the solenoid valve and close it to thereby reduce the pressure on said compressor;

wherein each of said condenser, expansion valve, two heat exchangers, evaporator and accumulator compressor system, have an inlet and an outlet for receiving and discharging refrigerant and which includes a plurality of thermocouples for temperature measurement within said system and wherein a first of said thermocouples is disposed between the outlet of said accumulator compressor system and said inlet of said condenser, said second of said thermocouples is disposed between said outlet of said condenser and said inlet of said heat exchanger, a third of said thermocouples is disposed between said output of said heat exchanger and said input of said evaporator valve, a fourth of said thermo couples disposed between said output of said evaporation valve and said inlet of said evaporator, a fifth of said thermocouples disposed between said outlet of said evaporator and said solenoid valve and a sixth of said thermocouples disposed between said second blocking valve and said input of said accumulator compressor system, which includes

an additional thermocouple for measuring the ambient temperature and an electronic control board for inputting a target temperature and wherein the efficiency of the air conditioning system is improved by a feedback determined by the ambient temperature and the target temperature,

a four-way valve for changing the flow of refrigerant between the two modes of operation, one mode with and one mode without a feedback loop that further includes a second feedback circuit and a second 3-way valve to control the refrigerant flow in one of said feedback circuits during a heating or a cooling cycle; and

,

said air conditioning system further comprising a second feedback loop, wherein the heat exchanger is two heat exchangers and wherein said compressor is an accumulator compressor system; and

which

includes an additional thermocouple for measuring the ambient temperature and an electronic control board for inputting a target temperature and wherein the efficiency of the system is improved by a feedback determined by the ambient temperature and the target temperature; and

a four-way valve for changing the flow of refrigerant between the two modes of operation, one mode with and one mode without a feedback loop;

a second feedback circuit and a second three-way valve to control the refrigerant flow in one of said feedback circuits during a heating or cooling cycle.

3. An air conditioning system according to claim 2 which includes temperature measurement electronics to measure the ambient temperature and plot a control strategy with and without the feedback loop to arrive at the target temperature.

4. An air conditioning system according to claim 3 in which the control strategy is selected between a path of rapid conversions to the target temperature and a path that minimizes the compressor running and the fan to continue cooling the condenser until it reaches the ambient temperature on time to set the fan time at the maintenance cycle.

5. An air conditioning system according to claim 4 in which the electronic control measures the compressor temperature and provides compressor cooling via a fan.