Cooper Miller asked:


As summer approaches, it is time to start thinking about our car’s air conditioning system and if it is working properly. One of the most common problems with an A/C system is refrigerant leaks and locating them. Finding the source of the leak can be a tedious and time consuming. The leaking Freon could come literally anywhere in the system from tubing to a accumulator to a tiny pressure switch gone bad. The EPA has made it much more stringent rules in dealing with refrigerant leaks. The days of topping off the air conditioner with a few cans of R12 are long over. Now even small leaks must found and corrected. Here comes technology to the rescue. There are several methods air conditioning repair shops employ to locate and fix refrigerant leaks. Each method has its pros and cons and their use depends on the situation. The three most commonly used are a electronic refrigerant leak detector, ultraviolet dye leak detection kit, and ultrasonic leak detector units.

Electronic Refrigerant Leak Detectors

Electronic Refrigerant Leak Detectors are the quickest and easiest to use of the three methods. Most of the time you will have no idea where the refrigerant is leaking and have to narrow down the possible areas. A electronic refrigerant leak detector can get you very close to the location of the leak and from there you can get more precise. Some of the better models will allow to crank up the sensitivity once you get the area found. For very small leaks you can wrap the suspected area in cling wrap or a rag to try and contain the refrigerant. When you unwrap the area, put in the refrigerant leak detector and see if you get a reading. Remember, refrigerant is heavier than air and it will sink to the ground. It is best to sniff under tubing and compartments when looking for it.

Ultrasonic Leak Detectors

These are state of the art leak detectors and are the newest tool to find refrigerant leaks. They operate on the principle of sound detection. Instead of sniffing for refrigerant gas they listen for the sound it makes as Freon escapes the system. To use an ultrasonic leak detector the system should be pressured in order for the refrigerant to leak out and make noise. Also, the work area must be totally silent. Remember it is looking for sound and no background noise is imperative. This is the main drawback to using an ultrasonic leak detector. Very few auto shops are quiet enough to use it effectively.

Ultraviolet Dye Leak Detectors

This third method ultraviolet dye is injected into the air conditioning system and in theory should escape with the refrigerant. Commonly, an auto shops have an ultraviolet leak detection kit that has all of the tools necessary to complete this task. Generally these kits come with ultraviolet lamp or ultraviolet flashlight, a dye injector, safety glasses and ultraviolet dye. This method is the most technically complex of the three and is the messiest. You have to inject the ultraviolet dye into the system and wait for it to leak out. The dye can be messy and get all over the place. It gets in you’re A/C system, your refrigerant manifold gauges and you. However once you shine your ultraviolet flashlight and spot the leak, you usually can see exactly where it is.

Each method has its pro and cons. For the beginner, I would recommend an electronic refrigerant leak detector and the professional auto shop would be better served with an ultraviolet leak detection kit.



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D Squared asked:


I live in the Appalachian Mtns. & do not have the temp. extremes. Natural gas is not available, electricity is reasonably priced. My under const. home is 5500 sq. ft on 2 floors 1 of which is a walkout basement that is 1/2 exposed & frame.
I have 9′ ceilings & some vaulted ceilings. I have been told by 3 heat pump companies that I need a 5 ton down & at least a 5 up but two 3 ton units would be better.
I received a quote from a geothermal co. using one 4 ton unit.
One of the heat pump men said that he thinks geo requires twice the tonnage as air source.
The geo man checked R- ratings in the walls & fenestration values from the windows when he made his calculations, the heat pump guys mainly used sq. footage allowing for a well insulated house.
No one else in this area knows about geothermal.
Thanks for your input.

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Marc A asked:


I am looking to buy some remote lake front property. I am debating between a grain/pellet burning stove, or a submerged geothermal setup that feeds right into the lake. Any opinions either way are much appreciated.

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Rolo asked:


Geothermal energy is energy that exists in nature as a result of heat from the Earth’s core. The most common utilization of geothermal energy is through hydrothermal means. Hydrothermal energy is energy derived from heated water. Water that is heated by the Earth can be used directly to supply heat to human homes.

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Craig b asked:


how it works

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astatine asked:


Can you provide explanations or links on systems that have been tried (perhaps even successfully) to harness heat during summer for use in winter in a large scale - essentially a very large battery?

I am somewhat aware of utilizing geothermal systems where the relatively constant underground temperature is used to heat cold water pumped down in winter, and cool warm water in summer.

I also know that energy is stored for shorter periods of time (typically overnight) by pumping water up to a reservoir during low power demand times to be used during peak loads.

What are other areas of research, and how much success has there been?

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IC asked:


The Refrigerator is an essential appliance in everyone’s home, it provides the perfect conditions to store foods in bulk so that they won’t get spoiled at ambient temperatures. This device has suffered mayor modifications within the last century, the first refrigerators had only one compartment and ran using toxic gases such as ammonia, that’s why these first appliances were not very practical and definitively not safe enough to keep at home.

As time went by, ammonia was replaced with a safer refrigerant called Freon or R-12, ever since this new substance started to be used to make refrigerators work this machine became highly commercial since it was now safe and convenient to use. Today, modern refrigerators count with more than one compartment, the two basic areas are the fridge which keeps the food at a temperature which is a few degrees above the temperature at which water becomes a solid or frozen and the other compartment which keeps food at temperature below water’s freezing point.

More recently, new refrigerators incorporated more compartments in order to keep different foods refrigerated at different temperatures, for instance some refrigerators have the following compartments: the freezer which runs at around -18 Celsius or 0 Fahrenheit, one which operates at 0 Celsius or 32 Fahrenheit and is meant for meats, another running at 5 Celsius or 40 Fahrenheit which is also called the refrigerator and last a compartment running at 10 Celsius or 50 Fahrenheit which is meant for vegetables.

As you can see, the refrigerator is a critical appliance which has to be working at all times, otherwise our foods get spoiled, but what happens when something goes wrong with it, do you panic and buy a new one or do you try to fix the problem? The first step is to always check the source of the problem, if your problem involves leaks or condensation problems there is a good chance you can do the repairs by yourself, that’s if you are somewhat familiar with electronics; on the other hand if the problem is electrical you might want to have a professional dealing with it since it is very dangerous to deal with appliances which involve water and electricity. If the problem is electric in nature it makes sense to buy a new one because the costs of repair can run pretty high, especially if some new part is required, all other problems should be easy enough to fix and shouldn’t cost too much to have repaired by a professional.



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aaron asked:


Kay i have a homework assignment for geothermal energy and i need to know the following things
Most economicallly promising areas for geothermal energy around the world
Causes of the heat
Methods of converting heat into usable energy
Your method of using this energy directly

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Uliju asked:


The atmosphere of earth was significantly different before the advent of living organisms. Without plants and a replicable process of photosynthesis, the atmosphere was almost completely absent of oxygen.

Nitrogen and carbon rich compounds, such as ammonia and methane were far more common in the environment then they are now. Combined with excess geothermal heat and lightning, it it hypothesized that genetic building blocks could have been created from these chemicals, such as simple self-replicating ammino acids.

Personally, I don’t see how this could be a religious issue at all. How is this similar to, “Evolutionists believe we all evolved from rocks”? Abiogenesis is a sound theory. What do you think?

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SQD asked:


House #1 20 room mansion ( not including 8 bathrooms ) heated by natural gas. Add on a pool ( and a pool house) and a separate guest house, all heated by gas. In one month this residence consumes more energy than the average American household does in a year The average bill for electricity and natural gas runs over $2400. In natural gas alone, this property consumes more than 20 times the national average for an American home. This house is not situated in a Northern or Midwestern “snow belt” area. It’s in the South.House #2 Designed by an architecture professor at a leading national university. This house incorporates every “green” feature current home construction can provide. The house is 4,000 square feet ( 4 bedrooms ) and is nestled on a high prairie in the American southwest. A central closet in the house holds geothermal heat-pumps drawing ground water through pipes sunk 300 feet into the ground. The water (usually 67 degrees F. ) heats the house in the winter and cools it in
summer. The system uses no fossil fuels such as oil or natural gas and it consumes one-quarter electricity required for a conventional heating/cooling system Rainwater from the roof is collected and funneled into a 25,000 gallon underground cistern. Wastewater from showers, sinks and toilets goes into underground purifying tanks and then into the cistern. The collected water then irrigates the land surrounding the house. Surrounding flowers and shrubs native to the area enable the property to blend into the surrounding rural landscape. ~~~~~HOUSE #1 is outside of Nashville, Tennessee; it is the abode of the “environmentalist” Al Gore. HOUSE #2 is on a ranch near Crawford,Texas; it is the residence the of the President of the United States, George W. Bush. An “inconvenient truth”. You can check this out on Snopes.com under “The Story of Two Houses”

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