Post a Comment. Tuesday, 26 July All about Refrigeration system on board the ship. Refrigeration prevents growth of micro-organisms, oxidation, fermentation and drying out of cargo etc. Credits: depositphotos. Any refrigeration unit works with different components inline to each other in series. The main components are:. Drier : The drier connected in the system consists of silica gel to remove any moisture from the refrigerant.
Solenoids : Different solenoid valves are used to control the flow of refrigerant into the hold or room. Master solenoid is provided in the main line and other solenoid is present in all individual cargo hold or rooms. Expansion valve : An Expansion valve regulates the refrigerants to maintain the correct hold or room temperature.
Control unit : The control unit consist of different safety and operating circuits for safe operation of the refer plant. When the pressure on the suction side drops below the set valve, the control unit stops the compressor and when the pressure on the discharge side shoots up, the compressor trips.
LP or low pressure cut out is controlled automatically i. HP or high pressure cut out is provided with manual re-set. The hot compressed liquid is passed to a receiver through a condenser to cool it down. The receiver can be used to collect the refrigerant when any major repair work has to be performed.
The master solenoid is fitted after the receiver, which is controlled by the control unit. In case of sudden stoppage of compressor, the master solenoid also closes, avoiding the flooding of evaporator with refrigerant liquid.
The room or hold solenoid and thermostatic valve regulate the flow of the refrigerant in to the room to maintain the temperature of the room. For this, the expansion valve is controlled by a diaphragm movement due to the pressure variation which is operated by the bulb sensor filled with expandable fluid fitted at the evaporator outlet.
This is how temperature is maintained in the refrigeration plant of the ship. A reefer system is the back bone of ships carrying refrigerated cargo. A malfunction of any of the components of the system can lead to degradation and wastage of perishable and cold storage cargo including provision for a ship. It is therefore important to maintain and run the refrigeration plant properly to avoid any breakdowns.
In this article we will learn about the safety feature of the refrigeration plant. The main safeties adopted for refrigeration plants are. How to Charge Refrigeration Plant on Ships? Short Cycling of Compressor Too low suction pressure Difficult to maintain temperature of rooms and holds Reduction in the efficiency of the plant When the above mentioned problems occur, it indicates that the plant has to be charged with the refrigerant.
There are two methods for charging reefer plants: Liquid charging and Gas charging. Gas Charging of Refrigeration Plant:. For gas charging, a special T piece valve block with mounted pressure gauge is provided to combine three connectors inter-connecting:. Following steps are to be taken for charging gas into the reefer plant:.
Connect gas bottle or charging cylinder, vacuum pump and charging point in the reefer system to the valve block. The discharge of the vacuum pump is to be connected in the empty recovery bottle. First open the valve between vacuum pump and charging bottle located in the valve block without opening the main valve of the charging cylinder.
This will remove all the air inside the pipe. Once vacuum is reached, close the valve of charge cylinder in the valve block. Now open the valve of the charging point pipe in the valve block and run the vacuum pump until the vacuum is reached.1 lb of snow crab legs how much meat
This will remove the trapped air from this pipe.With the blue gauge hooked up? Compressor not running I sho 3 pounds. Compressor on it shows The port that I am connected to is cool and the tube that is coming from the opposite side is barely warm. Thank you so much for sharing this information.
I enjoyed reading your blog and learned lots of tips Heating and Air Conditioning Courses. Thanks for very easy to follow procedure. I am planning to try this soon. What would be cost of freon per KG and how much required to refeel one house hold fridge? Hoping 4 anothr 3 years! Will stopleak work for refrigerators, or do the smaller orifices and tubes mean it'll just gum things up? I ask because I've got a leak in my evaporator and it's basically impossible to get to it's integrated into the skin of the refrigerator.
If you get the leak freeze with magic frost it will also lubricate your compressor for you. We use it at our shop all the time. If my system is totally empty and PSI is "0", should I pull a vacuum first to get the pressure to negative 30 psi before beginning the recharge? I assume you'd want to use a vacuum pump to pull out any air to allow the coolant to flow in.
Absolutely if it has been opened!
If it is still at 1 psi to. Also when you vacuum the system, it removes any moisture trapped in the system from "opening" it up. If I don't pull a vacuum will it still work? I'm pretty sure the freon is empty. With the stop leak, when do you put it in? Right after I pull a vacuum on the system, or should I charge it some first? So I broke down and ripped the foam insulation out of my fridge to get to the stamped aluminum evaporator because I was a bit worried that the stop-leak would screw up my compressor.L
So now I've identified a pinhole leak in the evaporator looks like one of those stamped aluminum things you see in mini-fridges, but it's totally flatand I'd like to know the best way to fix it.
Any ideas? JB Weld? Can I use my propane torch and plumbers solder? I just did a recharge on a small refridg I added what the tag said and now the compressor is noisy and shuts down after min of running and no cooling.
This is a new unit that was not charged from new. It had a pierce valve already on it.InspectAPedia tolerates no conflicts of interest.
We have no relationship with advertisers, products, or services discussed at this website. This article describes the procedures for charging an air conditioner, heat pump, refrigerator, freezer, or similar equipment - how does an HVAC service tech put the proper amount of refrigerant into the system?
Refrigerator Repair - 247around Brings Quality, Convenience & Reliability
We describe use of a traditional charging cylinder, vaporizing connectors for low-side charging, and modern refrigerant recovery, charging, and vacuum equipment.
As we've explained, charging an empty system will require evacuating it first. For a typical household equipment this takes about 15 minutes but for a larger commercial refrigeration system this process can take an hour. On commercial systems being installed or having major service it would be preferable to leave the evacuator pump running for 12 hours - the longer you evacuate the system the cleaner it will be.
That's because as the system warms up moisture in the system will vaporize further and thus be removed.Zpanel vs sentora
Low side charging is also referred to as vapor charging - that is we allow ONLY refrigerant vapor or gas to enter the system. This is an easy but time consuming method of system charging. The canister supplying refrigerant is connected to the gauge service port and opened, and the HVAC equipment or appliance is run which pumps refrigerant gas from the supply source in parallel with pumping from the outlet of the evaporator coil. A step by step example of low-side charging of refrigerant on an older R22 system can be seen.
When charging an air conditioner, heat pump, or refrigeration appliance from the high side, the system being serviced is turned OFF. The refrigerant gas canister is placed upside down so that only pure liquid refrigerant leaves the canister. Note that once you start the system running you will not be able to charge on the high side because the head pressure out of the compressor will be higher than the evaporation pressure in the canister - it would push refrigerant back into the canister.
With critically-charged HVAC or appliance refrigeration systems, such as a household refrigerator or air conditioner, you must measure the refrigerant entering the system. Typically the technician uses a scale that registers in ounces to measure a weighed charge, though we also used other devices such as a charging cylinder that actually shows the volume of liquid refrigerant in the cylinder on a temperature-compensating scale.
In this case the charging board Dial-a-Charge charging cylinder produced by Robinaire, Montpelier OH is loaded with the proper refrigerant charge from the gas cylinder, and the outlet from the charging board is then connected into the high side perhaps through the gauge service port.
The refrigerant vaporizing connector such as Imperial's Kwik-Charge, assures that liquid refrigerant passing through the device will convert to gas as it exits the device. This will let you add a measured refrigerant charge to the low side of the system while still making an accurate measurement of the refrigerant measured in ounces.
Liquid refrigerant charging is always faster than low side vapor charging. On the low side you have to charge, then wait for the system pressures to balance, then reexamine the frost line etc. As an alternative to making refrigerant measurements by weight or temperature-corrected volume using a scale or charging cylinder, some HVAC service technicians may adjust the refrigerant charge by watching the low side pressure and the exact location of the frost line at the evaporator coil blower fan not running.
On small refrigeration systems such as a home refrigerator or window air conditioner the refrigerant charge needs to be accurately measured or the system will not work properly. But on larger HVACR systems and on commercial units that use a liquid refrigerant receiver a sort of buffer that stores extra liquid refrigerantyou might find a sight glass on the refrigerant piping downstream from the condensing coil. Some techs add refrigerant while watching that sight glass, adding refrigerant until the gas bubbles just stop.
If you see bubbles there either the system is badly contaminated or more likely the refrigerant charge is short. We warned just above - don't overcharge the system - you can damage the equipment. Technical Note : if you see bubbles in the sight glass, or if you hear gurgling in the refrigerant lines indeed those can be indicators that the refrigerant charge in the system is low.
Note that a reading of "zero" on these pressure gauges is not really zero, it's 14 psi or 1 atmosphere. Also if you look closely at your gauges you 'll see that one permits pressure readings in the "negative" direction - used when pulling a vacuum on the system using an evacuator pump - a step necessary before charging a system that has been opened for service or repair. To remove all moisture or refrigerant from an air conditioner, heat pump, refrigerator, or other refrigeration equipment your evacuator pump needs therefore to pump past "zero" on the gauge 14 psi to absolute zero or For all your refrigerator repairs, around is your assistant.
We at around have qualified on-ground engineers for Refrigerator Repair to bring back your Refrigerator back to life in short time and at minimum cost. Our engineers visit in shortest possible time which ensures that you get Refrigerator Repair at your home without any delay. Peak summers and you realize the Refrigerator not cooling.
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How to Charge Refrigeration Plant on Ships?
Follow up from their team was prompt. My special time request was taken care without reminders. I didn't get a chance to use the service as I was perfectly consulted on phone how to resolve the issue. Awesome remote diagnostics at no charge. Toggle navigation. Home Prices Blog Call: Select City. Please check Prices to find out around service charges for all appliances. Refrigerator Not Cooling. Read More. Buzzing Noise From Refrigerator? Complaint 3.
Why my fridge makes loud noise? Is something drastically wrong with my refrigerator? Customer Delight.The main use of refrigeration plants on ships is to keep cargo and food provisions at low temperature to prevent them from spoiling.
The reefer plant is a combination of various machines such as compressor, valves, heat exchangers etc. While in operation, the refrigerant used in the refer plant gets consumed or is reduced in quantity because of leakage in the system.
Reduction in quantity of refrigerant may lead to troubles in the plant such as. When the above mentioned problems occur, it indicates that the plant has to be charged with the refrigerant. For gas charging, a special T piece valve block with mounted pressure gauge is provided to combine three connectors inter-connecting:. Connect gas bottle or charging cylinder, vacuum pump and charging point in the reefer system to the valve block.
First open the valve between vacuum pump and charging bottle located in the valve block without opening the main valve of the charging cylinder.
Recharging your Refrigerator
This will remove all the air inside the pipe. Once vacuum is reached, close the valve of charge cylinder in the valve block.
Now open the valve of the charging point pipe in the valve block and run the vacuum pump until the vacuum is reached. This will remove the trapped air from this pipe. Then shut the valve in the valve block. Now keep the system idle for 5 minutes to check there is no pressure drop.
This will ensure there are no leakages in the system. Now open charging bottle pipe valve and the charging point pipe valve located in the valve block.
This will set the line for charging. Ensure that the vacuum pump valve is shut. Ensure that no refrigerant is leaked out in the environment as these effects the ozone layer in the atmosphere.
Mohit Kaushik is a marine engineer sailing with Maersk Shipping. He handles website development and technical support at Marine Insight. Apart from handling web development projects, he also manages a logistics company and have a keen interest in modern logistic technologies.
How do you remove excess charge in a reefer plant? And what are those extra connections found on the sides of the charging block? Datta: The Charging bottle is a pressurized gas bottle hence gas easily flows from the pipes. If the plant is excessively charged, then you have to stop the system, collect the gas and remove it in to the collecting bottle.
As Stated, gas bottle is kept on weighing scale. May i add : Point 9 — Open condenser outlet valve.
Point 10 — Slowly open the compressor suction valve. Once the compressor is running, open it fully. Point 11 — Once the system has settled down, check the liquid line sight glass for bubbles and check individual room temperatures.
Is it necessary to close suction and discharge valves of the compressor during vacuuming the system? And, why is it that once we have charge the system, run the compressor, the high pressure cut outs but the temp still high. Thanks you so much for this site.Until then the most common refrigerant used was R Many AC systems today use a refrigerant known as RA. The refrigerants are very different not only in composition but also in the processes used to charge the system.
The tools needed for charging a system with RA are different from those used for R22 charging. For the purposes of this article, assume there are no leaks in the RA system. If a system is leaking it must be repaired before recharging. Inspect the coils, blower wheels and the blower motor speed to insure they are operating properly. Using the manufacturer's coil specification sheets, confirm the pressure drop across coils.
The airflow measurement is used to find the evaporator load, so it must be accurate. Check the system operating pressures. Attach the hoses from the manifold gauge to the pressure taps on the liquid and suction service valves. Service valve locations can be found anywhere within the outside cabinet, but generally they are located near the coil.
Read and record the information on the pressure gauges for liquid and suction with the pencil and paper. Measure the dry bulb temperature by placing a thermometer where air goes to the indoor unit in the return duct. Wrap the thermometer bulb in wet cloth and then measure the wet bulb temperature the same way as the dry bulb measurement, recording the results. This is an important step since it finds the evaporator load that's having a key effect on system pressures.
Measure the liquid-line temperature to determine sub-cooling. Use a liquid-line thermometer that has a probe that can be tightly attached to the line. Place the attachment approximately 6 inches from the liquid service valve. Write down the measurement results. Connect the hoses from your manifold gauge to the pressure taps on the liquid and suction service valves.
Measure and record the liquid and suction pressures. Measure the high side pressure at the service valve pressure tap for the liquid-line.
Use a pressure conversion chart to change the high side pressure to saturated temperature. Deduct the liquid-line temperature from the saturation temperature of RA refrigerant in the condenser to compute the sub-cooling value.
On the manufacturer's data sheet find the correct operating pressures for the circumstances found for the measured air. Also look at the sheet for needed sub-cooling levels. Charge the unit with enough RA to meet the manufacturer's specification if, based on the information from their data sheet, there may be a too low sub-cooling problem.Photo by Charles J.
Ever had refrigerator angst? I suffered it myself for a short time last summer, after I accidentally discharged the refrigerant from the new fridge unit I had installed. Reading assorted treatises on marine refrigeration only elevated my angst. Various experts on web forums warned direly of the dangers of getting air into the system, failing to purge the refrigeration gauges, overcharging with refrigerant and blinding oneself with escaping gases.
It was time to find out. Had there been an unidentified leak, the repair would have involved tracing and repairing it, then sucking air and moisture out of the system with a vacuum pump before recharging. More than likely, this would have required the services of one of those elusive professionals. I bought the Ra refrigerant over the counter at an auto parts store.
This setup can be used to recharge any system with a Danfoss compressor. Then I connected one of the two valves on the charging kit to the refrigerant canister, making sure the other one—the manifold valve—was closed. It was now the moment of truth.
For an evaporator system like this, the pressure will drop to 3 to 7psi as the box cools down. Holding plates will show a higher initial pressure, psi, and then drop to under 10psi.
Otherwise, its contents will emerge as a spray of freezing liquid. Another 5-second blast brought the pressure up to 10psi. Once the box was fully cooled down, this would almost certainly drop to 7psi or thereabouts.
I checked for overcharging—indicated by frost forming on the suction tube more than a foot from the evaporator plate—and all was well. The refrigerator has worked perfectly since its recharge. How about taking an online course with longtime sail-trainer NauticEd? In addition to being fun, the courses will truly elevate your sailing skills to a whole new April At a time when most people are dreaming about being in public without hand sanitizer, it makes sense that marine enthusiasts are increasingly fantasizing about feeling liberated, rather than cooped up, spending days with family members on a boat.
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