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As rule of the thumb, refrigerant condensing temperature should between 1-2 degreeC higher than the exiting water temperature, this temperature difference is technically called condensing temperature approach. I f the approach is below or above means, system is flooded with refrigerant or system got starve. Above method is also effective in determining if the condenser shell needs maintenance for sclale, sludge build up removal.
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When outside ambient air temperature is 90 degree the temperature of the condening refrigerant in a standard efficiency unit should be approximately?
The condensing temperature of the refrigerant in a standard efficiency unit should be around 30-40 degrees Fahrenheit higher than the outdoor ambient temperature. Therefore, when the outside temperature is 90 degrees, the condensing temperature of the refrigerant would be around 120-130 degrees Fahrenheit.
When testing the efficiency of a water cooled condenser the refrigerant condensing temperature should be approximately higher than the leaving water temperature?
When testing the efficiency of a water-cooled condenser, the refrigerant condensing temperature should indeed be higher than the leaving water temperature to ensure effective heat transfer. This temperature difference allows the refrigerant to release heat to the water, facilitating condensation. If the condensing temperature is not sufficiently above the leaving water temperature, the condenser may not operate efficiently, leading to reduced system performance and potential overheating. Properly managing this temperature difference is crucial for optimal condenser operation.
When a standard efficiency air cooled condenser is used the condensing refrigerant will normally be what degree higher in temperature than the entering air temperature?
When a standard efficiency air-cooled condenser is used, the condensing refrigerant typically operates about 15 to 20 degrees Fahrenheit higher than the entering air temperature. This temperature difference is necessary to facilitate the heat transfer process, allowing the refrigerant to release heat to the surrounding air effectively. Variations can occur based on specific system design and environmental conditions.
Can an undercharge cause superheat?
Undercharge can cause HIGH superheat. Overcharge can cause LOW superheat. You need some superheat when charged correctly. How much is needed is depending on outdoor air temperature and indoor wet-bulb temperature.
Why do refrigerants trun from liquid to gas?
This is because as the liquid passes through the refrigerator, it absorbs the heat from the food in the fridge. Therefore as heat is transferred from the food to the refrigerant, the following happen: - The temperature of the food falls - the temperature of the refrigerant rises. Thus, a higher temperature would change the refrigerant from liquid to gas.
How does the sunshine affect the operation of a condensing unit?
Sunshine can increase the operating pressure and temperature of a condensing unit, which can affect its efficiency and cooling capacity. This can lead to higher energy consumption and potential strain on the system, especially if it's not designed to handle the increased load. Providing shade or proper ventilation for the condensing unit can help mitigate these effects.
What is the low side and high side pressure for r410a?
Technicians with R-22 experience will need to become familiar with working with high and low side pressures that are much higher when using R-410A. A typical R-22 system operating normally with a head pressure of 260 psig at a 120-degree condensing temperature and a low side pressure of 76 psig at a 45-degree evaporator saturation temperature will find the equivalent pressures in a R-410A system to be much higher.A normally operating R-410A system with the same condensing temperature of 120 degrees and a 45 degree evaporator saturation temperature will have a high side pressure of 418 psig and a low side pressure of 130 psig.Although refrigerant 410A is a near-azeotrope and has a slight temperature glide, there is no need to correct for refrigerant dew point and bubble point differences. Superheat and sub cooling calculations can be calculated the same way we have always done with R-22 refrigerant. The only difference will be the higher pressure-temperature relationship when reading the temperature-pressure chart. The temperature glide for R-410A is only .3 degrees Fahrenheit and can be ignored and fractionation is not a concern.
How does the refrigeration cycle in a heat pump work to transfer heat from a lower temperature source to a higher temperature sink?
The refrigeration cycle in a heat pump works by using a refrigerant to absorb heat from a lower temperature source, such as the air outside, and then transferring that heat to a higher temperature sink, such as the inside of a building. This process is achieved through the use of a compressor, condenser, expansion valve, and evaporator, which work together to circulate the refrigerant and facilitate the transfer of heat.
When charging a system with a low pressure refrigerant should be introduced as a vapor to raise saturation temperature to a minim of?
When charging a system with a low-pressure refrigerant, it is generally recommended to introduce the refrigerant as a vapor to raise the saturation temperature to a minimum of about 25°F (-4°C) or higher, depending on the specific refrigerant being used and the system design. This helps to ensure proper circulation and prevents liquid refrigerant from flooding the compressor, which could lead to damage. Additionally, maintaining the correct saturation temperature is crucial for optimal system performance and efficiency. Always refer to the manufacturer’s guidelines for the specific refrigerant being used.
How do you read discharge superheat?
Discharge superheat is read by measuring the temperature of the refrigerant gas at the compressor discharge and comparing it to the saturation temperature of the refrigerant at the corresponding pressure. This is typically done using a temperature probe and pressure gauge. The difference between these two temperatures indicates the degree of superheat; a higher superheat value suggests that the refrigerant is well vaporized and there is less risk of liquid refrigerant returning to the compressor. Maintaining appropriate superheat levels is crucial for efficient system operation and to prevent compressor damage.
Which refrigerant has the highest boiling temperatures at atmospheric pressure?
The refrigerant plays a key role in achieving vapor cycle air ... After that, and until all the water has been evaporated, the remaining boiling liquid stays at the ... of the higher temperature of boiling resulting from increased pressure.
Will ac consume less power during winter?
Air conditioning usually consumes less power in winter, but mainly because it isn't needed as much. You should expect the air moving parts of the machine to have litttle interest in the outdoor air temperature. You might expect that the refrigerant compressor would consume less power in the winter because the the condensing temperature and head pressure would be lower. In practice, the the A/C must limit the system condensing temperature and maintain a higher head pressure to avoid the compressor oil being pumped out and/or liquid refrigerant being returned instead of vapor and damaging the compressor. Head pressure controls often begin to maintain condensing pressure and temperature at roughly 80°F, below which the condenser fans are either slowed or cycled on and off. Larger systems will employ additional safeguards. Any electrical savings from the condenser fan running slower or less often are made up for by a compressor heater that runs in the compressor off cycle to keep refrigerant from condensing in a cold compresssor shell and filling it with liquid refrigerant that would result in damage when it started. Simple systems lacking head pressure controls risk shortened operating life below 60°F and may suffer compressor damage at lower temperatures. So... if you are looking for efficiency in data center cooling in a cold area, the A/C itself won't help. A more complex system with a chilled water loop may be configured to use either refrigeration or simple heat exchange. Air to Air heat exchangers can also be employed.
