As with any other aspect of a car, it is vitally important for you to get your air conditioning system checked on a regular basis. Due to the a/c unit not being checked in regular MOT testing, people unfortunately make the mistake of forgoing any further checks until it is too late and something has gone wrong. Here are a few reasons why you should get your air conditioning checked on a regular basis.
1. Smell in the A/C system - This is a very common problem found in older air conditioning systems whether it be an Audi or a Rover. As your car gets older, there is a higher chance that bacteria and fungus can grow in the system just behind the dashboard. This makes it near impossible for you to clean yourself and can lead to an awful smell being produced when the a/c is on. These microorganisms not only smell awful but, if continually inhaled, could lead to further problems such as flu like systems and tight airways. This is more commonly known as 'sick car syndrome'.
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A/C isn't cold enough - There is no point in having the air conditioning on if it is not making a substantial difference to the temperature of the car. As the weather gets warmer, cars get significantly hotter especially when left in the sun. Some people may opt for the alternative of driving with the windows open as this 'saves' petrol. This may save the very small amount of petrol used by the a/c unit however all the extra drag caused by having the windows open will ultimately amount to the same petrol being used. If your a/c system is not producing enough cold air then you will need to have it recharged. This will return the system to its original functioning by replacing the coolant. Your vehicle can lose up to 15% of its coolant every year so it is important to keep topping it
First, I will discuss exactly what happens on the low pressure, low temperature side of the refrigeration system. The refrigerant runs through the expansion valve which regulates the flow of the refrigerant between the high and low side. The low pressure, cool liquid then goes to the evaporator where heat from the inside air is absorbed and changes the liquid to a gas. The hot, low pressure gas then moves to the compressor where it then compressed to a high pressure, hot gas.
Standard Air Conditioner There are a number of standard air conditioner systems that are available on the market. One is a unitary system. The one room air conditioners sit in a window or wall opening, with interior controls. A large house or building may have several units, permitting each room to be cooled separately. Another type is the basic central air conditioning unit, which offers whole house-house cooling. It is usually a large, loud, mechanism that sits outside of the home. Although these standard air conditioners may be effective, they come with drawbacks. According to the U.S. Department of Energy, Americans spend $22 billion a year and use more than 183 billion kilowatt-hours of electricity to cool their homes with standard air conditioning. Also those air conditioners release about 100 million tons of carbon dioxide into the air annually -- two tons for each home that has one.
In warmer climates such as Egypt they used techniques as evaporative cooling, “if water is placed in shallow trays during the cool tropical nights, its rapid evaporation can cause ice to form in the trays, even if the air does not fall below freezing temperatures”. Although refrigeration developed in the 18th century it wasn’t until the mid-19th century when the first refrigerator built using vapor technology was build by American John Gorrie in 1844. A few years later commercial refrigeration was introduced as well as vapor compression technology which was the beginning of our modern refrigeration. Later that century ammonia was popularized as the evaporation chemical in refrigeration. All the trials and tribulations of refrigeration where all stepping stones to the 20th century and the introduction of modern refrigeration as we know it
Refrigeration, the production of cold, is an essential practice for present-day living. It is used in a many place like the processing and preservation of food, conditioning of air for comfort, manufacture of chemicals and other materials, cooling of concrete, medical applications etc. Refrigeration is defined as the science of maintaining the temperature of a particular space lower than its surrounding space. Refrigeration and air conditioning involves various processes such as compression, expansion, cooling, heating, humidification, de-humidification, air purification, air distribution etc. In all these processes, there is an exchange of mass, momentum and energy. All these exchanges are subject to certain fundamental laws. Hence to understand and analyses the refrigeration and air conditioning systems, a basic knowledge of the laws of thermodynamics, fluid mechanics and heat transfer is essential.
some people are trying to reduce the waste from using air conditioning, “Recently, New York City prohibited stores from pumping arctic air out on to the searing
Do you regularly suffer from irritating symptoms including headaches, a runny nose and itching? If so, it could be a case of Sick Building Syndrome. The problem could be with the building you work in and live in, your working environment or the way you or living environment.
While Driving?). (Cover story)." CPCU eJournal 63.11 (2010): 1-13. Academic Search Premier. Web. 13 Apr. 2011.
There's nothing worse than when someone goes to the toilet and leaves their utter stench of last nights meal behind them. Then, it always happens, they think they can make it all better by spraying some air freshener. Instead of making things better, they get worse. The air condition goes from unbearable to lethal. When the stench particles combine with the air freshener, it makes a deadly mask that seems to forever hang. Even napalm gas is better than this.
Since the evaporator coil is responsible for making the air in the system cool, it’s an incredibly important part that must always be in working condition. It’s job is to turn the coolant in the unit to a gas form, which then cools down the coil. When warm air passes over this coil, it becomes chilled before passing through all the vents in your home.
Refrigeration Refrigeration is defined as “The process of removing heat from an enclosed space, or from a substance, to lower its pressure.” (First website given in bibliography) In simpler terms, it is removing heat from states of matter in order to keep them cooler. The basic need for refrigeration is to cool food and beverages, as they often get spoilt if the temperature is high. Before actual refrigerators and other such mechanical systems were introduced, it was very common for people to cool their food with ice and snow.
Humanity is threatened by the overwhelming growth of science and technology. People are expanding their knowledge through observation and experiment, oblivious to the consequences that result from improper motive. Isaac Asimov—author of The Life and Times of Multivac—uses the science of numbers, or mathematics, as a solution to the fear that arises in a world controlled by a human-like machine. What human beings are afraid of is losing the very word that separates them from everything else in the world—human, and they will do whatever they can to keep that title to themselves.
Finally, the liquid moves to the evaporator, where heat from the inside air is absorbed and changes it from a liquid to a gas. After that, it goes again to the compressor, where the entire cycle is repeated.
Air is composed of molecules. Air is matter. It has mass and takes up space. Air is composed of different gases such as nitrogen, oxygen, carbon dioxide, water vapor, and other gases. Air molecules are in constant motion. As they move, they come in contact with surfaces. Air molecules push and press on the surfaces they contact. The amount of force per unit area that air molecules exert on a surface is called air pressure. (What is Air Pressure 6) Air pressure is caused by all of the air molecules in the Earth's atmosphere pressing down on the Earth's surfaces. We can measure air pressure to help us predict weather conditions around the world. Temperature also affects air pressure because air contracts when it cools and expands when it is heated. So if air above a region of Earth cools, it does not extend to as high an altitude as the surrounding air. In this case, its pressure at higher temperature is lower than in the surroundings even when the pressure at the surface is the same as in surrounding areas. Then air flows into the cooler region at high altitude, making the total weight of air above the region greater than in the surroundings. This is a "high". The cool air descends to the earth's surface. Near the surface, the falling air spreads out,
Process cd : This liquid refrigerant is collected in the liquid storage tank and later on it is expanded to low pressure and temperature by passing it through the throttle valve. At point d we have low temperature liquid refrigerant with small amounts of vapour .