bromochlorofluorocarbon is the most harmful type of refrigerant.
bromochlorofluorocarbon is the most harmful type of refrigerant.
which type of refrigerant is the most harmful?
bromochlorofluorocarbon
Na
Na
flow control, or metering, of the refrigerant is accomplished by use of a temperature sensing bulb, filled with a gas or liquid charge similar to the one inside the system, that causes the orifice in the valve to open against the spring pressure in the valve body as the temperature on the bulb increases. as the suction line temperature decreases, so does the pressure in the bulb and therefore on the spring, causing the valve to close. an air conditioning system with a tx valve is often more efficient than other designs that do not use one. also, tx valve air conditioning systems don't require an accumulator (a refrigerant tank placed downstream of the evaporator's outlet), since the valves reduce the liquid refrigerant flow when the evaporator's thermal load decreases, so that all the refrigerant completely evaporates inside the evaporator (in normal operating conditions such as a proper evaporator temperature and airflow). however, a liquid refrigerant receiver tank needs to be placed in the liquid line before the tx valve so that, in low evaporator thermal load conditions, any excess liquid refrigerant can be stored inside it, preventing any liquid from backflowing inside the condenser coil from the liquid line. at heat loads which are very low compared to the valve's ton of refrigeration rating, the orifice can become oversized for the heat load, and the valve can begin to repeatedly open and close, in an attempt to control the superheat to the set value, making the superheat oscillate. cross charges, that is, sensing bulb charges composed of a mixture of different refrigerants or also non-refrigerant gases such as nitrogen (as opposed to a charge composed exclusively of the same refrigerant inside the system, known as a parallel charge), set so that the vapour pressure vs temperature curve of the bulb charge "crosses" the vapour pressure vs temperature curve of the system's refrigerant at a certain temperature value (that is, a bulb charge set so that, below a certain refrigerant temperature, the vapour pressure of the bulb charge suddenly becomes higher than that of the system's refrigerant, forcing the metering pin to stay into an open position), or even different kinds of bleed passages that generate a minimum refrigerant flow at all times, help to reduce the superheat hunt phenomenon by preventing the valve orifice from completely closing, at the cost, however, of determining a certain flow of refrigerant that won't reach the suction line in a fully evaporated state while the heat load is particularly low, and that the compressor must be designed to handle.
thermal expansion valve