What does a discharge line have to do • Discharge gas lines (often referred to as hot gas lines) allow refrigerant to flow from the discharge of the compressor to the inlet of the condenser. • Undersizing discharge lines will reduce compressor capacity and increase compressor work.
What does a discharge gas line do on a refrigerator?
What does a discharge line have to do • Discharge gas lines (often referred to as hot gas lines) allow refrigerant to flow from the discharge of the compressor to the inlet of the condenser. • Undersizing discharge lines will reduce compressor capacity and increase compressor work.
What is a a discharge line?
A discharge line is a section of piping where the pressure is higher than atmospheric pressure (e. g. Pump system). what is the difference between suction line and discharge line?
What is the function of the liquid line in a refrigerator?
The liquid line is full of high-pressure liquid refrigerant. When the high-pressure liquid hits the small restrictor in the metering device, the pressure is immediately reduced.
What is the suction and discharge line size of R410A refrigeration system?
Determine the suction and discharge line sizes of a 130 kW R410A refrigerating system operating at 5 °C suction and 40 °C of condensing temperatures. The suction line consists of Lt=15 m of straight tube with 8 long radius elbows while the discharge line consists of 15 m with 10 standard elbows.
What is the discharge line?
A discharge line is a section of piping where the pressure is higher than atmospheric pressure (e.g. Pump system).
What is the difference between suction line and discharge line?
The suction line connects the evaporator to the compressor, the discharge line connects the compressor to the condenser, and the liquid line connects the condenser to the expansion device.
Is the discharge line the high side?
The high side, or discharge line, will be the line connected to the compressor from the bottom or lower position. It will not be wrapped in insulation and will be warm to the touch. This is where freon exits the compressor as a liquid.
What is the discharge line of an AC compressor?
The discharge line exiting the compressor is the hottest part of a refrigeration or air conditioning system. The compressor's discharge line temperature can be measured by placing an insulated thermistor on the discharge line about 3 inches from the compressor.
Is suction line Hot or cold?
The Copper Pipe (Suction Line) should be sweating and cold to the touch during a hot day. If it is not cold, your compressor could be off (bad capacitor/ hard start kit) or low on Refrigerant. Your Breaker is Tripped. Be Careful because this usually indicates a problem with the compressor or wiring.
What is the discharge temperature?
The discharge temperature is a measure of the superheated refrigerant's vapor temperature. Since the compressor's discharge temperature is a superheated vapor temperature measurement, a pressure/temperature relationship does not exist, and a pressure gauge cannot be used for its measurement.
Is discharge line big or small?
But, in general, discharge lines are smaller because they can tolerate more pressure drop without hurting the system's performance.
Which line is bigger discharge or suction?
The discharge pipe may be larger than the suction pipe. The purpose of the lines is to keep the losses to a minimum. This is done to make sure there is enough Net Positive Suction Head available to meet the requirements of the pump.
Which is suction line?
The larger line typically carries a cool gas and is insulated. This is commonly referred to as the suction line, but it is also called the return line or vapor line. The smaller uninsulated line typically carries a warm liquid. It is most often called the liquid line.
Why is my discharge line so hot?
What causes high discharge temperature? High discharge temperature is the result of temperatures in the compressor head and cylinders becoming so hot that the oil loses its ability to lubricate properly. This causes rings, pistons and cylinders to wear resulting in blow by, leaking valves, and metal debris in the oil.
What is HVAC subcooling?
Subcooling occurs when you cool a vapor below the temperature at which it turns into a liquid. Let's use the same refrigerant with a high pressure boiling point of 120 degrees for the following example: The refrigerant is a 140 degree vapor heading into the condenser.
What is superheat and subcooling?
Superheat is defined as the amount of heat added to a vapor above its boiling point. Subcooling is defined as the amount of heat removed from a liquid below its condensing point.
Why should the discharge line be turned flat after the reducer?
To enable good access to valve handwheels and ease of supporting, the discharge line should be turned flat after the reducer, and the line angled away from the nozzle to enable the line to be supported from grade. •.
What is a PRV discharge line?
The PRV discharge line and flare header should be designed so that the built-up back pressure does not exceed the allowable limits in Section 8.3.3. The flare header system should also be designed to ensure that the superimposed back pressure, caused by venting or relief from another source, does not prevent PRVs from opening at a pressure adequate to protect equipment per the ASME Code. Once the superimposed, built-up, and total back pressures are calculated based on a pressure drop analysis of the discharge system, they should be specified on the data sheet for the PRV under consideration.
What is the critical section of a compressor circuit?
The critical section of the circuit is where there is no liquid refrigerant left to help move the oil, that is the evaporator outlet and the suction line back to the compressor. Suction lines should be sloped downwards towards the compressor but not as to allow liquid to flood the compressor.
What is pump discharge?
A pump discharge line is like a potential organ pipe. Just like an organ pipe, or any other wind instrument, it can acoustically resonate in response to a periodic signal located at one end. Acoustic mechanics tells us that the resonant frequency is a function of pipe length.
Why is it necessary to have adequate velocity in the line from the compressor?
This will avoid accumulation of oil or liquid refrigerant in the discharge head of the compressor during idle periods. Where the condenser is above the compressor, it is necessary to have adequate velocity in the line from the compressor, or oil separator, to ensure that oil is carried forward.
What happens when a pipe is short?
If the line is very short, the resonant frequency is high – usually far too high to be excited by anything within the pump. As the line gets longer, then it is possible for the pump to generate vane-passing pulsations at frequencies corresponding with the pipe acoustic resonant frequency.
Why do you need a non return valve?
A non-return valve may be fitted as a safeguard to prevent oil flowing back. Horizontal lines should sloped downwards in the flow direction. Traces of oil, which enter the condenser, will settle on the cooling surfaces and fall to the bottom as a liquid or become dissolved in the condensed refrigerant.
What is the outside unit of a split air conditioner called?
The word “condenser” can mean two different things. Many in the industry will refer to the outside unit on a split air conditioner, heat pump, or refrigeration unit as a “condenser, ” even though it will often contain the condenser, compressor, and other parts. It's better to call the outside component the “condensing unit” or simply the “outside unit” to reduce confusion.
Why does the air flow over the coil lower?
When the air temperature or airflow over the coil is lower, it will have lower pressure and temperature in the coil due to less heat being absorbed in the coil. The refrigerant leaves the evaporator, travels down the suction line, and heads back to the compressor, where the cycle starts all over again.
How does a condenser work?
Most modern condensers flow air over the tubing where the refrigerant is flowing—the heat transfers out of the refrigerant and into the air. The cooling medium can also be water. In the case of a water-source system, water is circulated across the refrigerant in a heat exchanger.
Do refrigeration systems require a compressor?
It prepares the refrigerant for the condensing process, which is crucial for heat rejection. However, some refrigeration methods don’t require a compressor.
Is the expansion line full of gas?
The expansion line is full of mixed vapor/liquid flash gas. Yes, this was a long one, but more than anything else, just keep repeating the following over and over: compressor > discharge line > condenser > liquid line > metering device > expansion line > evaporator > suction line and on and on and on….
What causes a higher discharge line temp?
A high head or low suction pressure can cause a higher discharge line temp. Think of it this way: if the compressor is working against a higher pressure in the discharge line, it will need to do more work (higher compression ratio) to get it to that pressure. This increases the electrical consumption of the motor in the compressor, ...
Why is my condenser discharge line temperature high?
You can also see an increased discharge line temp if you have a high suction superheat at the condenser due to an uninsulated or improperly insulated suction line . On the condenser side, anything that causes a high head will also cause a high discharge line temperature: overcharge, low condenser airflow due to improper motor or blade, ...
Why is my heat pump running in heat mode?
In the case of heat pump units running in heat mode, the most common causes are dirty air filters or other indoor airflow restrictions (because the condenser is now inside during heat mode). In short, high discharge temp can commonly be caused by: Low charge (high suction superheat, low suction pressure, low subcool) Severe overcharge.
What does a discharge line do?
• Discharge gas lines (often referred to as hot gas lines) allow refrigerant to flow from the discharge of the compressor to the inlet of the condenser. • Undersizing discharge lines will reduce compressor capacity and increase compressor work.
What does a suction line do?
What does a suction line have to do . •Suction gas lines allow refrigerant gas from the evaporator to flow into the inlet of the compressor. •Undersizing the suction line reduces compressor capacity by forcing it to operate at a lower suction pressure to maintain the desired evaporator temperature.
