Refrigerant charging system and method for variable speed compressor based ac system
a charging system and compressor technology, applied in refrigeration machines, lighting and heating apparatus, refrigeration safety arrangements, etc., can solve the problems of not being able to charge the system precisely, not being able to redo the control wires and refrigerant lines in a practical way, and not being able to upgrade them. to achieve the effect of optimal efficiency
Inactive Publication Date: 2021-10-28
ECOER INC
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Benefits of technology
The patent describes a new system and method for charging refrigerant in variable speed AC systems. The goal is to ensure that the system runs efficiently by accurately charging the refrigerant, even when the length of the lines and the parameters of the indoor unit cannot be determined. The system includes a compressor, reversing valve, thermal expansion valve, defroster, and other sensors. The method involves running the system for a predetermined time at a predetermined speed based on the AC tonnage. The parameters obtained from the sensors are used to calculate various sub-cooling degrees, superheat degrees, and heat transfer difference. The thermal expansion valve is then determined to be open if the superheat degrees are within the appropriate range. Overall, this new system and method allow for more precise charging of refrigerant in variable speed AC systems.
Problems solved by technology
It is also not a practical approach to redo control wires and refrigerant lines.
Even upgrading them might not be an option in some cases due to the building structure itself.
On the other hand, because length of existing refrigerant lines and the indoor unit size (the inner volume of the coil) are not known during upgrade, technicians cannot charge the system precisely.
When the system is over charged, the evaporator performance is severely affected, and so is the system's cooling efficiency.
In worse cases, it could also lead to compressor damage because of the liquid slugging.
Conversely, when the system is under charged, the cooling capacity is lowered due to smaller refrigerant rate flow, in effect lowering the system's cooling efficiency.
Method used
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first embodiment
[0014]FIG. 1 is the variable speed AC system configuration diagram of the first embodiment. As shown, it comprises: a variable speed compressor 1, a reversing valve 2, a thermal expansion valve (TXV) 3, a defroster 4, a condenser 5, an inlet refrigerant temperature sensor 6, an outlet refrigerant temperature sensor 7, a suction pressure sensor 8, a discharge pressure sensor 9, a liquid line temperature sensor 10, outdoor air temperature sensor 11, defroster temperature sensor 12, evaporator 13 and controller 14.
[0015]FIG. 2 shows a system diagram of the control method of the variable speed AC system, under cooling operation according to the first embodiment. Before determining the refrigerant charging diagnosis, the AC system should be run for 15-20 minutes under a predetermined speed, where the speed is chosen based on the AC tonnage chart below:
Tonnage2345Speed56665666(cooling) / RPS
[0016]From the chart, if the system is 4 tons or 5 tons, the compressor discharge volume is about twi...
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The present disclosure relates to the field of air conditioning technology. In particular, it involves a refrigerant charging method for variable speed compressor based ac system.
Description
BACKGROUND OF TIE DISCLOSURE[0001]The disclosure below will assume common knowledge of air conditioning and heat pump as well as their heat exchange principle in terms of achieving cooling and heating. Therefore, when discussing particular AC inner working, it is applied to heat pump collectively. The discussion will also treat compressor speed and compressor RPS (rotation per second) interchangeably as well.[0002]With the development of air-conditioning technology, variable speed air conditioner is becoming mainstream product because it is energy efficient, low noise and good thermostatic, etc. Conventional variable speed air conditioner generally includes an indoor unit, an outdoor unit, control wires and refrigerant lines between indoor unit and outdoor unit. The control wires and refrigerant lines are usually berried into building structure. It is also not a practical approach to redo control wires and refrigerant lines. Even upgrading them might not be an option in some cases d...
Claims
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IPC IPC(8): F25B45/00F25B49/02
CPCF25B45/00F25B49/022F25B2345/001F25B2345/003F25B2500/23F25B2700/2106F25B2600/2513F25B2700/1933F25B2700/1931F25B2700/21151F25B2700/21152F25B2600/0253F25B2700/21163
Inventor HUANG, ZHICHENGLI, ZHONGHUI
Owner ECOER INC