摘要:
A service valve for isolating the compressor of a chiller system from a flooded evaporator cooler that includes a suction pipe mounted in the top section of the evaporator that extends downwardly into the evaporator shell and a shut-off valve mounted inside the shell that is arranged to close against the bottom opening of the suction pipe. The valve is connected by linkage to a shaft that passes through the suction pipe outside the evaporator which when rotated, permits the valve to be opened and closed.
摘要:
An oil separator for a refrigeration system having two inlets for receiving two streams of a mixture of oil and refrigerant for separation. One inlet is on each side of the oil separator. This allows for a separator with a smaller diameter to be used to achieve the same preferred speed of travel of the oil-refrigerant mixture.
摘要:
The present invention is a method for controlling oil lubricant pressure of a screw type compressor in an air conditioning system. In response to a low oil pressure condition, evaporator pressure is lowered to increase the pressure differential across a compressor, to thereby bring about an increase in oil pressure. Evaporator pressure can be lowered by decreasing the maximum operating pressure of the evaporator, and by throttling an expansion valve by the amount required to lower the evaporator pressure in accordance with the reduced maximum operating setpoint.
摘要:
A flash tank economizer containing a first expansion device to expand high pressure refrigerant from a system condenser to an intermediate pressure and a second expansion device for further expanding liquid refrigerant at the intermediate pressure that has collected in the tank to a desired low pressure for delivery to the system evaporator. Vapor phase refrigerant produced by the first expansion in the tank is injected back into the system compressor at the intermediate pressure.
摘要:
Programmable headers with fixed jumpers are used at the input of a microprocessor to develop a binary code for use by the microprocessor to configure the microprocessor to the physical characteristics of an assembled refrigeration unit. The programmable header is programmed at the factory by selectively breaking the jumpers to develop the binary code. The programming of the microprocessor for accessory equipment can be performed by field service personnel by using small DIP switches to develop a binary code for the microprocessor.
摘要:
A method and control system are disclosed for operating a refrigeration system to protect the refrigeration system compressor from adverse operating conditions. A first signal indicative of the saturation temperature of the refrigerant in an evaporator of the refrigeration system, and a second signal indicative of the temperature of gaseous refrigerant flowing from the evaporator to the compressor of the refrigeration system compressor, are provided to a microcomputer system which processes the first and second signals to determine the superheat of the gaseous refrigerant flowing to the compressor. The microcomputer system generates an alarm signal to shut down operation of the refrigeration system if the detected superheat is less than a lower limit or greater than an upper limit of a normal range of superheat values.
摘要:
A refrigeration system is disclosed which may have multiple compression and condenser stages, in which an electronic refrigerant expansion valve is controlled by the digital output of a microcomputer which adjust the expansion valve in response to a valve change signal which is a function of a fraction of the deviation of the sensed refrigerant superheat from a desired superheat added to a multiple of the computed rate of change of the refrigerant superheat.
摘要:
A refrigerant system has an electric motor positioned either inside or outside of a hermetically sealed shell containing a compressor pump unit and is mechanically coupled to drive this compressor pump unit. The electric motor has at least one thermoelectric cooler to cool, or assist in cooling, of at least one component of the electric motor.
摘要:
An oil separator for a refrigeration system having a screw compressor for pressurizing and circulating refrigerant through the system, an evaporator, a condenser and an oil separator. The oil separator is placed within the housing of the condenser.
摘要:
A method and control system are disclosed for operating a refrigeration system to protect the refrigeration system compressor from flooding at startup of the refrigeration system. When the refrigeration system is to be shut down, refrigerant flow from a condenser to an evaporator of the refrigeration system is effectively closed off and the refrigeration system compressor is run for a first preselected time period sufficient to reduce the refrigerant pressure in the evaporator to a first desired, relatively low level. Then, prior to restarting the refrigeration system, the compressor is again run with the refrigerant flow from the condenser to the evaporator closed off to pump refrigerant out of the evaporator to reduce the refrigerant pressure in the evaporator to a second desired, relatively low level.This dual pump down cycle ensures that no liquid refrigerant from the evaporator will enter the compressor when the refrigeration system is restarted.