Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B41/00—Fluid-circulation arrangements
  • F25B41/30—Expansion means; Dispositions thereof
  • F25B41/31—Expansion valves
  • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B2600/00—Control issues
  • F25B2600/25—Control of valves
  • F25B2600/2513—Expansion valves
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
  • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

• a power control valve is proposed for the electronic, continuous control of a refrigeration machine or noise pump, consisting of a closed refrigerant circuit with one or more evaporators, compressors and condensers.
• the proposed capacity control valve is installed in the liquid line between the condenser and the evaporator, instead of conventional expansion valves.
• Conventional expansion valves have the task of releasing the refrigerant liquid to the pressure prevailing in the evaporator and filling the evaporator with refrigerant to such an extent that a desired, selectable overheating of the suction gas occurs.
• Thermostatic expansion valves are only to be used as automatic regulators for the maximum evaporator charge with the corresponding gas overheating. Due to their properties, electronic expansion valves can additionally optimize the evaporator charge while minimizing gas overheating. If both procedures are lacking further precautions, e.g. Suction throttle control, hot gas bypass control, the chiller continuously generates its maximum possible output, which depends on the delivery volume of the compressor, the dimensioning of the evaporator and the condenser and the prevailing temperature and humidity conditions. However, the power generated by the refrigeration machine rarely corresponds to the actual cooling power requirement. Therefore, the cooling capacity of the M a seem to be matched to current needs.
• the known expansion valves are therefore optimization elements of the refrigeration machine, but are not suitable instruments for power control. Auxiliary devices must therefore often be provided which either restrict or redirect the refrigerant flow circulating in the machine as required. If the amount of refrigerant flowing through the expansion valve is greatly reduced, thermostatic expansion valves tend to regulate the evaporator charge and overheating unstably and therefore inaccurately.
• the power control valve proposed here stands out from the previously known through the following points:
• an electronically operated control valve is proposed, which can be positioned by a variety of control and control signals. It primarily regulates the cooling capacity as required.
• the overheating is not regulated to a constant value, but varies depending on the load.
• the power control valve acts as an actuator of several control loops, each consisting of one or more sensors, controllers and control systems.
• the valve is controlled by electronic control signals (current, voltage).
• the power control valve is closed when de-energized. In this way, it reduces refrigerant migration in the system and eliminates the need for additional shut-off valves in the liquid line.
• the control valve opens continuously with increasing voltage. This increases the flow rate through the control valve. The cooling capacity of the machine increases. If, on the other hand, the control signal drops, the control valve closes continuously and thus throttles the flow rate, and the cooling capacity drops accordingly.
• the power control valve can be positioned by a demand signal (temperature, humidity, etc.) from a power control device. The valve is then the actuator of the power control - The power control valve can be positioned electronically by a control signal from the evaporator charge control (overheating control). The valve is then the actuator of the overheating control. - The power control valve can be electronically positioned using a control signal from a suction gas temperature control. The valve is then the actuator of the suction gas temperature control. The suction gas temperature control is used to monitor the gas temperature at the inlet of the compressor. - The power control valve can be positioned by a control signal of a suction pressure control. The valve is then the actuator of the suction pressure control.
• the suction pressure control is used to monitor the suction pressure at the inlet of the compressor. If, for example, the suction pressure drops below a desired level, the power control valve is opened until the suction pressure adjusts to a desired value. - The power control valve can be moved by control signals to a position that allows the evaporator to be drained.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Air Conditioning Control Device (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4226314

Family Applications (1)

Country Status (3)

Families Citing this family (2)

Citations (9)

• 1987
  • 1987-06-01 CH CH2119/87A patent/CH676286A5/de not_active IP Right Cessation
• 1988
  • 1988-03-10 WO PCT/CH1988/000057 patent/WO1988009908A1/de unknown
  • 1988-03-10 AU AU13669/88A patent/AU1366988A/en not_active Abandoned

Patent Citations (9)

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