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What is the superheat if the suction pressure is 60 psig and the suction line temperature is 40 degrees?
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What is a pressure differential?
its pressure between suction and discharge flow...
Can a suction side cleaner be converted to a pressure side cleaner in a gunite pool?
I've been in the pool business for 19 years. All that's necessary is a couple of simple, inexpensive changes in the pump room and the wall return. We make this change frequently in the industry.
Is it possible to cut a perfect circle in the middle of a pane of glass and remove it without breaking the rest of the glass?
Yes, of course it is. There are class cutters with rubber suction cups that have rotating arm with the cutter at the tip. You stick the suction cup in the middle of the pane of glass, then rotate the arm so that the cutter cuts a circle around it. Then you can tap the center of the pane carefully and, using the suction cup to hold it, take out the circle. There it is! A circle of glass, and a pane of glass with a circular hole. For an experienced glass cutter it is an easy job but, if you have not cut glass before, you may need some practice.
How does the fire department use hydraulic multiplication?
The term hydraulic multiplication is usually applied in fire fighting to indicate that water pressure is increased by the use of multiple "stages" to jack up pressure and delivery rates. Let's look at an example. An engine company arrives at a structure fire and the engine commander knows that fighting this with water in the tank will not be a good tactic. He orders a reverse lay (2 x 2 1/2" lines, or perhaps a 4" supply line, depending), and the engine is then set up at the hydrant to act as a manifold. The engineer connects the pump suction to the hydrant. There is pressure in the mains that feed the hydrant, but the pump in the engine will take that pressure and step it up to pump water through the two lines to the "scene" of the fire. The second-in engine sets up at the end of those two lines, and connects one to the suction of itspump. Let's review what is happening as regards the hydraulic multiplication. Pressure in the mains (at the hydrant) is multiplied by the first-in engine and delivered to the second-in engine. The second-in engine multiplies that to deliver water to large (almost certainly 2 1/2") handlines on the fire ground. Any appliance on that second engine is also employed to direct a stream. If a truck arrives (which it should, eventually), it can hook up to the second-in engine, and that engine will then pump to the suction of the truck's pump. That's hydrant outlet to an engine, to another engine, and on to the truck. The truck will deploy its high reach nozzle(s) to get more wet stuff on the red stuff. It's easy to see that the hydrant can only be tapped for so much flow, but the hydraulic multiplication of the three pieces of apparatus here is a no brainer. If water needs to be moved up a long, steep hill, like perhaps in San Francisco, it might not be unusual for several engines to pump that water up the hill. And there might even be a fire boat at the bottom as the first link in the chain. The San Francisco Bay is a virtually unlimited water source!
Will your air conditioner lose efficiency if the 1 and 1 eighth inch vapor line is connected to the old 3 quarter inch line about halfway to the evaporator coil?
Hi:You wanna know something ???? ( lol ) Something just plain wierd bout this question and I'll tell you why.1,,, one and 1/8th in vapor lines ( Suction Lines ) aretypically used on 7 to 10 or more ton cooling unints.2,,, 3/4" vapor lines ( Suction Lines ) are typically usedon 3 ton and smaller cooling units.So here is the delima !!!!,,,,,, how on earth did you end up with this mix match in the first place?????And just as a side note,,, Bigger suction lines are ( NOT )always better.Reason being: There needs to be a certain velocity in the return pipe for the low pressure side of the system to effectively return any compressor oil that may have migrated into the evaporative system.There are other issues as well ( BUT )I ain't talkin till you tell me how you got this mix match set up. LOL,,,, teasing you,,, but really,,, this I need to know to tell you much more.Jimiwane
How do you measure fre-on?
On smaller residential air conditioners the manufacturer publishes a charging chart that has the outside air temperature and the corresponding suction and liquid pressure measured by a refrigeration manifold set, gauges. If the chart is not available, you can estimate by measuring the suction pressure and then using a pressure temperature chart for your refrigerant and trying to maintain a 35 degree to 40 degree temperature at the condensing unit or compressor. The other measurement on larger units is the subcooling measurement, measure the actual liquid line temperature and compare the liquid pressure using a pressure temperature chart and also checking for bubbles in the liquid line sight glass. On larger systems after the subcooling has been checked then the superheat has to be checked and the thermostatic expansion valve adjusted if necessary. To check the superheat, measure the suction pressure, convert to a temperature and then measure the actual suction line temperature. The difference is the superheat, should be 6 to 20 degrees depending on the system.
What is the purpose of the external equalizer on a TXV?
The purpose of the External equalizer on the TXV is to compensate for the pressure drop in the evaporator coil , This is done since the superheat calculation is based on the difference in the Saturation temperature corresponding to the Suction pressure (Measured after the coil) and the actual suction line temperature. Now, in a TXV measurement of actual line temperature is accomplished by using the Sensing Bulb and the Measurement of the Suction pressure by the External Equalizer of the TXV. The opening/Closing of the Expansion valve is controlled by the setting of the superheat which is governed by the setting of the Spring.
What happening when you are overcharging an air conditioning with freon?
discharge pressure is high, suction pressure is high superheat is low and subcooling is high.
What is suction and discharge superheat?
Suction superheat is the heat added to the refrigerant above that required to change its state from liquid to vapour (as happens in the evaporator). This heat is added both in the evaporator, in the suction line and (where applicable) in the suction accumulator.Discharge superheat is suction superheat plus heat of compression, and must be removed in the condenser before condensation, the change of state from vapour to liquid, can occur.The HVAC Veteran
How do you determine what suction pressure should be in R22 air conditioning compressors suction line?
The proper suction pressure of any air conditioning or refrigeration system is determined by the type of refrigerant used and sometimes the amount of charge. : Suction pressure used is also directly related to the temperature required. : The temperature required in the evaporator relates to the pressure required in the suction line since, the fluid is at saturation in the evaporator. : Knowing the temperature required, use the fluid's saturation tables to find the corresponding pressure required.
What temperature do clear suction cups melt at?
They melt at about 100 degrees celcius; which is about 210 degrees feirnhait
How do calculate the superheat f an air conditioner?
When you are gauged up on the unit, as close to where your temperature reading will be taken as possible, (note: ofter times the there will be access specifically for this purpose very near the txv) use a good thermometer and obtain the temperature of the suction line 6 inches out from the evaporator coil. (right where the sensing bulb is in refrigeration or the equalizer tube for the txv in A/C is best.) Then, convert the pressure reading on your suction gauge to degrees for the type of refrigerant in the system and subtract it from the reading on your thermometer. This is the amount of heat that is being added to the refigerant AFTER it has changed state from a liquid to vapor. Remember to use a temperature pressure chart to get your temps for what kind of refigerant that's in the system. A/C systems should be between 15 and 20 degrees F Refrigeration is more like 6 - 12 degrees .
Where is suction and discharge s?
Answer: The terms suction and discharge are the terms refer to hydraulics. In hydraulics if the the liquid has to be lifted or pumped to the usage area the hydraulic pump will be used . This pump will have to functions that is first suction to lift the fluid and the discharge or delivery . The familiar words in pair are lift and discharge; suction and discharge. The specification of pump for these terms are suction head and discharge head.AnswerThe suction pressure refers to the pressure of the referigerant being "sucked" back into the compressor. The suction pressure is a critical variable in ensuring the accuracy of the refrigerant charge, along with the tepmerature of that line as well. The "superheat", or heat added to the vapor in that line can be monitored in this manner.You have not mention which suction pressure... Actually Where ever the suction is presented that pressure is called suction pressure.... and suction pressure in practical cases normally always less that atmospheric pressure and in case of delivery pressure it is oppositeSaying that suction pressure is " the pressure of the referigerant being "sucked" back into the compressor " is not accurate.Simply , the suction pressure of a pump is the absolute pressure of a fluid , measured at the inlet of the pump ( in your answer , the pump is the compressor , and the fluid is whatever refrigerant. )The discharge pressure , is the absolute pressure of the liquid measured at the outlet of the pump.Obviously, the discharge pressure is usually bigger than suction pressure.
What is the relationship between evaporator air flow and suction superheat?
air flow and liquid change of state
How do you calculate suction pressure for air theoretically?
Air has a pressure, but not a suction pressure. Air pressure is measured with a barometer, you do not calculate it. Suction pressure is a concept which applies to a pump. Suction pressure = static pressure + surface pressure - vapour pressure - friction pressure.
What is vapour binding?
when pressure on the suction side of the pump drop below the vapour pressure of the liquid, vapour forms. It's caused because of insufficient suction head, high suction lift, excessive friction head, or high liquid temperature.
What will happen if suction temperature of centrifugal compressor increased?
There will be little change or effect if the suction temperature of centrifugal compression increases. This is because the gases included incur minimal changes. The required temperature for proper functionality is 43 degrees Celsius.
