Which Central Air Conditioner Is Better: Air Cooled, Water Cooled, Or Variable Refrigerant Volume?
Each of them have their special characteristics, common features, pros and cons. One need to select based on the objectives, resources and constraints of the individual. Lets analyse the basic features.Air cooled Chiller -In comparison to water cooled chillers-Less complicated, lower installation cost, Cost effective in less than 1000 tons range, cooling is not affected by air humidity, lower area for plant equipment, higher power consumption per ton, less complicated maintenance and lower efficiency. Compared to Variable refrigerant Flow system-Less efficient, less complicated, easy for expansion or modification, more expensive, suitable for higher capacity, no pipe length restrictions and less prone to complete shutdown.Water cooled chillerSuitable for high capacity systems particularly group of buildings etc in places where air humidity is not very high and water is available plenty. No system can match its operational economy here. Variable refrigerant Flow system-Highly efficient due to VF driven compressors and efficient refrigerant. Systems, once designed and installed can not be easily expanded or altered. Very sensitive to installation expertise as piping mismatches and leakages can spoil the show. Better acoustic performance, complicated controls and continuous reliance on manufactures support.Which central air conditioner is better: air cooled, water cooled, or variable refrigerant volume?â¢ Related QuestionsWhat kind of central air conditioner is good to buy for the Miami Florida weather?Pay attention to the SEER (cooling efficiency) and, just as importantly, the dehumidification capacity since comfort is a function of both temperature and humidity, the control unit should be both a thermostat and humidistat.If you opt for a single external cooling tower/evaporation unit, be aware that such units may be stolen if the house is unoccupied even for a week and they should be secured either within an enclosure or with some form of impervious fixation.Look for a multi-stage compressor. That means that instead of on or off, your compressor can more efficiently adapt itu2019s power to the need, as well as operate more quietly as levels under full power. If you are near the ocean, it pays to have a u201csea airu201d-proofed external unit. Salt air can destroy unprotected aluminum cooling fins in a few years, turning them to a powdery aluminum oxide. Choose units that are specially coated or, if you are thinking very long-term, look for stainless steel units that are usually needed on ships. It is worthwhile rinsing off the fins regularly if you live on the seafront.Finally, if it for a secondary home, it may make more sense, especially if there is no attic or preexisting duct work, to use multiple mini split systems, cooling only the rooms used and minimizing ductwork costs.What kind of central air conditioner is good to buy for the Miami Florida weather?.------How do I maintain an air conditioner?Central air conditioners have two separate components: the condenser and the evaporator. The condenser unit is usually located outside the house on a concrete slab. The evaporator coil is mounted in the plenum or main duct junction above the furnace. Most central air conditioners are connected to a home's forced-air distribution system. Thus, the same motor, blower, and ductwork used for heating are used to distribute cool air from the air conditioning system. When a central air conditioner is operating, hot air inside the house flows to the furnace through the return-air duct. The hot air is moved by the blower across the cooled evaporator coil in the plenum and is then delivered through ducts to cool the house. When the air conditioner works but the house doesn't cool, the problem is probably in the distribution system. Both the evaporator and the condenser are sealed. Therefore, a professional service person should be called for almost any maintenance other than routine cleaning. Central air conditioners should be professionally inspected and adjusted before the beginning of every cooling season. However, don't let your maintenance end with this annual checkup. While there aren't many repairs you can make yourself, there are specific maintenance procedures you can follow to keep your system operating at peak efficiency------Why can we not use vapor absorption refrigeration system in our normal household air conditioners?We could. But it would not be cost effective. First of all, the equipment is MUCH more expensive than your average central air conditioner. It should also be noted that absorption systems are larger and more complex, which means that more space is required. Some types also require a cooling tower, which further increases costs and space requirement along with now requiring cooling water. The requirement of a cooling tower also means decreased performance in humid climates. Of course, absorption cooling is also well-known to have a lower coefficient of performance, which increases operating costs.In the end, absorption cooling really only makes sense when you have a free source of heat that would otherwise be wasted. Examples of such heat sources include engine exhaust and geothermal energy. It should also be noted that the heat source must be of fairly high temperature, which rules out the use of MANY sources of waste heat. Absorption cooling has been used in solar applications. But in recent years, it has become less attractive due to the possibility of using conventional vapor compression systems powered by photovoltaics (which get cheaper by the year).The bottom line? Absorption cooling can work well in certain situations. But the high cost of equipment, low efficiency, and need for a free and relatively high temperature heat source precludes its use for typical residential applications. Why can we not use vapor absorption refrigeration system in our normal household air conditioners?------What are the main reasons why a central air conditioner unit would make a rattling noise?What are the main reasons why a central air conditioner unit would make a rattling noise?Hello Kim Dalessandro,There are two main reasons.First, something is loose somewhere and needs to be secured. One would have to trace down as to where and what. Also the blower (fan) assembly might need servicing such as cleaning and lubrication. On the outdoor unit, you might have a cracked, broken or out of balance fan blade. Make sure the outdoor unit is sitting level. Second, you might have a Heat Pump system instead of just an air conditioner. Sometimes the check valve in the indoor coil of a Heat Pump system will rattle after the system shuts down and near the end of system equalization. This would only rattle somewhere between half to three minutes after the system cycled off and it would be a relatively short burst, maybe 10 to 20 seconds. The first reason, you can probably trace down yourself by listening an looking. If you should attempt a repair, TURN OFF ALL ELECTRICAL POWER TO THE SYSTEM. THERE ARE USUALY TWO AND SOMETIMES MORE CIRCUIT BRAKERS INVOLVED. DO NOT attempt to do anything about the second reason. Only a qualified service technician has the knowledge and tools to perform a proper diagnosis and repair.I hope this helps.What are the main reasons why a central air conditioner unit would make a rattling noise?.------My central air conditioner is not cooling the house. Can you help troubleshooting?There are three basic reasons for air conditioner freeze ups: Insufficient air flow Refrigerant charge Outdoor temperature 1) The two most common causes of insufficient air flow are dirty filters and under sized ducts. A dirty filter limits air flow which in turn allows the cooling coils temperature to drop below freezing. Replacing the filter, monthly, usually alleviates this problem. Under sized ducts will also cause the system to freeze Because it also limits the amount of air flowing over the cooling coil. This results in lowering the coil temperature and allowing the humidity in the air to collect on the coil and freeze. 2)Refrigerant charge. The refrigerant system teeters on a delicate balance. If the system is not charged correctly, the system will not function properly. This malfunction may result in the poor cooling output and/or freezing up. Only a qualified, certified service technician can properly test and charge a refrigerant system. 3) Outdoor temperature. If night time temperatures are too low, the system will not operate properly, and freeze up may occur. The outdoor unit does not function well in temperatures below 60 degrees F. A special ambient temperature control must be installed to allow the unit to run properly in cool temperatures, or you may open your windows and save energy.------Whats a good alt to central air conditioning?you could no longer pass incorrect with an attic fan. They deploy interior the attic floor with a louvered beginning to the residing house or in a louvered beginning interior the attic wall with self-final louvers interior the residing house ceiling. They suck cool night air into the residing house by open residing house windows and rigidity it out the attic. whilst sized surprising they are able to do sufficient air transformations that the great residing house reaches the exterior air temperature interior minutes. they are going to furnish each and all the cooling you pick different than on those few nights a 365 days that it continues to be warm and muggy all night. you're working a fractional horsepower motor and pay for hundreds of kilowatt hours. in case you had an equivalent air conditioner you would be paying for hundreds of kilowatt hours so the decrease fee expenses are significant (previous the preliminary extra low priced fee). whether in some unspecified time interior the destiny you put in an air conditioner, working the attic fan for a on a similar time as gets the nice and snug air out of the attic (a hundred and forty ranges on a bad summer season day) and ease the burden that the air conditoner will could conflict------How does Air conditioner/ central heating/cooling System work?Central air conditioners incorporate two different coils in order to cool your home. This type of cooling system is used to cool the entire home, versus a window air conditioner that is used to cool a specific area or room of your home. The cooling compressor is set outside the home, separate from the fan unit used to blow the cool air throughout the home on the central air unit, unlike the window air conditioner that utilizes everything within one concealed unit. By using the existing heating/cooling ducts that encompass the entire home, the central air unit can cool the entire home evenly.The coil that is placed outside of your home is called the condensing coil. It consists of a compressor, condensing coil condenser fan, a grill to protect persons from coming into contact with the fan blade, a case built around all of the components, controls, and two refrigerant lines that run into the home to the evaporator coil. The refrigerant inside the compressor is pumped through the evaporator coil inside, which cools the air as the furnace fan blows air through the coil.The coil absorbs the heat from the air. Then the refrigerant flows back outside to the condenser coil and this is where the heat that was absorbed is released. At this point, the refrigerant is returned to a liquid form as it is cooled and the cycle of refrigerant flow continues.