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Search Results - Refrigeration

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Refrigeration is the process of removing heat from an enclosed space, or from a substance, and moving it to a place where it is unobjectionable. The primary purpose of refrigeration is lowering the temperature of the enclosed space or substance and then maintaining that lower temperature. The term cooling refers generally to any natural or artificial process by which heat is dissipated. The process of artificially producing extreme cold temperatures is referred to as cryogenics.

Cold is the absence of heat, hence in order to decrease a temperature, one "removes heat", rather than "adding cold." In order to satisfy the Second Law of Thermodynamics, some form of work must be performed to accomplish this. This work is traditionally done by mechanical work but can also be done by magnetism, laser or other means.[citation needed]

The use of ice to refrigerate and thus preserve food goes back to prehistoric times.[1][2] Through the ages, the seasonal harvesting of snow and ice was a regular practice of most of the ancient cultures Chinese, Hebrews, Greeks, Romans, Persians. Ice and snow were stored in caves or dugouts lined with straw or other insulating materials. The Persians stored ice in pits called yakhchals. Rationing of the ice allowed the preservation of foods over the warm periods. This practice worked well down through the centuries, with icehouses remaining in use into the twentieth century.

In the 16th century, the discovery of chemical refrigeration was one of the first steps toward artificial means of refrigeration. Sodium nitrate or potassium nitrate, when added to water, lowered the water temperature and created a sort of refrigeration bath for cooling substances. In Italy, such a solution was used to chill wine.[3]

Showing 1 to 25 of 184 Articles matching 'Refrigeration' in related articles.
Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | Next >>

1. Home Hvac: Providing Comfort
November 01, 2009

HVAC (pronounced either as "H-V-A-C" or "H-vak") is an acronym that stands for the directly related functions of "Heating, Ventilating, and Air Conditioning"- the technology meant for indoor environmental comfort. HVAC (Heating Ventilation Air Conditioning) system design is a most important sub discipline of mechanical engineering, working using the principles of thermodynamics, fluid mechanics, and transfer of heat. Refrigeration is at times added to the field's abbreviation as HVAC&R or HVACR, or ventilating is dropped like in HACR (such as the designation of HACR-rated circuit breakers). ... (read more)

Author: Todd Submitoff

2. My Parent Rewards card, My Parent Reward Discount Card
October 29, 2009

My Parent Rewards (www.myparentrewards.com) My Parent Rewards is everything a coupon book is in a card! Instead of buying a coupon book that can only be used in 1 city, the My Parent Rewards Card is less expensive and can be used at 100,000 locations across the US and Canada. Learn More: (www.myparentrewards.comRead More on My Parent Rewards Card (MPR Card) Reviews: http://www.squidoo.com/my-parent-rewardshttp://www.squidoo.com/MPR-cardshttp://www.squidoo.com/my-parent-rewardsAdvantages of My Parent Rewards ProgramThis fundraiser requires no minimums, no storage, no refrigeration, and NO RISK!... (read more)

Author: Dexter Mcguire

3. Things to Consider When Shopping for Commercial Refrigeration Units
October 26, 2009

Commercial Refrigeration equipments are an absolute necessity in any business establishment that offers food and beverages. These units are available in various sizes, designs and features which can make shopping for the best equipment for your refrigeration needs quite daunting. Below are the types of commercial refrigeration units and the essential things to consider when you go shopping for them. Commercial refrigeration units usually come as standard reach-in models. However, there are many commercial refrigerator types that may fit your cold-storage needs. There are worktop refrige... (read more)

Author: Johson Mckell

4. Air conditioning system basics and theories
October 26, 2009

In the refrigeration cyclehe refrigeration cycle, a heat pump transfers heat from a lower-temperature heat source into a higher-temperature heat sink. Heat would naturally flow in the opposite direction. This is the most common type of air conditioning. A refrigerator works in much the same way, as it pumps the heat out of the interior and into the room in which it stands. This cycle takes advantage of the way phase changes work, where latent heat is released at a constant temperature during a liquid/gas phase change, and where varying the pressure of a pure substance also varies its condensa... (read more)

Author: Wendy zong

5. Thermal Energy Storage Systems
October 22, 2009

Thermal Energy Storage (TES) may be considered as a useful tool to reduce the number of refrigeration machines by means of spreading the daytime load over 24 hours period. Hence, any type of TES systems can be considered as useful tool to reduce the overall environmental impact for a given cooling application. Ice TES has the advantage of universal availability, low cost and transport ability through other system components. However, a conventional water based TES system for air conditioning application requires low temperature chillers and therefore standard water chillers must be replaced w... (read more)

Author: Zafer Ure

6. Restaurant equipment for appearance and durability
October 05, 2009

So you are getting ready to open up your own restaurant – where do you begin to figure out what you need? Going to a one stop shop like an online retailer is a great place to start. They tend to have just about every piece of restaurant equipment that you need to get started. Starting with the major appliances, you must have a good refrigeration system, freezers and ice machines. An important part of restaurant equipment is the dishwasher. Prep and working tables along with large kitchen sinks are all must have restaurant equipment. There are so many vital elements that make up comp... (read more)

Author: rossmc cullum

7. Quality and efficiency - Commercial Fridges
October 05, 2009

Refrigeration is key to the restaurant industry and commercial fridges are geared especially to be used in places that will use it more intensively than the regular homeowner. Keeping foods at the right temperature is important for the safety of your customers and is something that health inspectors take very seriously. Keeping foods at an incorrect temperature could mean a fast spread of bacteria that will make the food inedible and possibly make someone ill. There are a number of commercial fridges on the market that will make sure that your foods are always kept at just the right tempe... (read more)

Author: rossmc cullum

8. Arizona and California Residents Buying More Heat Pumps
October 02, 2009

Heat Pumps becoming More Popular for Heating and Air Conditioning Arizona and Southern California are excellent areas for Heat Pumps Areas like Arizona and Southern California are really starting to warm up to heat pumps. Heat pumps have been available for years, but recent rises in energy costs mixed with economic concerns have lead people to replace their aging air conditioners with heat pumps to save on costs. The reason why heat pumps are gaining popularity in southwest states like Arizona and California is because their limitations are nullified by the warm winters. Heat pumps ... (read more)

Author: William Hauselburg

9. Air & Fuel Industrial Filters
October 01, 2009

If you want to clean out automobile, air elements are often utilized. Air filters remove particles and clean dust, mold and other baceterium that can inhibit and smallen the life of your vehicle. There are a multitude of brands available and many different options of filters to use in your automobile. There are a variety of filters out there in the world. These include Inlet Elements, Refrigeration Oil Filters, Dust Collector Elements and Bags, and Panel Filters. Common filter cleaning services are able of washing out an air cleaner element up to six times. Whether you pick a cleanin... (read more)

Author: Ross Hudgens

10. California Technical Schools Popular in Today's Economy
October 01, 2009

Rancho Cordova Technical Schools Offer what a 4-year Bachelor Degree Can’t For years, industrial jobs like HVACR maintenance were looked down upon. Because of this, enrollment in traditional 4-year colleges steadily increased. As a result, the number of people going into the trade industry went down. Now, as a record number of high school graduates are continuing onto college, attending a trade school is starting to look more appealing. Cost plays a big role in this shift in perception. Receiving an education from a CA trade school costs less than getting a bachelor's degree from a 4... (read more)

Author: William Hauselburg

11. Southern California Air Conditioning Sales Slow, Bright Future Expected
September 24, 2009

Despite Slowing Sales, Air Conditioning Industry Looking Forward to a Bright Future According to a report by the Heating, Air conditioning and Refrigeration Distributors International (HARDI) summer 2009's air conditioning sales were like the weather, not so hot. Summer weather and air conditioning sales generally go together in California. When it is hot outside for weeks on end, people need an air conditioning unit which can keep up with the demand. Extended heat during the summer month can also lead to older units burning out. With a more mild summer, these issues don't pop up. Because... (read more)

Author: William Hauselburg

12. Is DIY (Do It Yourself) Spray Foam the Best Choice, or Is It Better to Have a Professional Installa
September 22, 2009

When you plan to insulate your home, your first thoughts should focus on quality, as there are numerous different ways one can have one's abode securely insulated. One particularly good type of insulation to consider is spray foam. Both durable and water resistant, spray foam is so versatile that it is used in a variety of practical applications like refrigeration and packaging, but it is especially useful as insulation. There is little doubt that spray foam is better than fiberglass and cellulose insulation. Both fiberglass and cellulose have low R-values per inch and therefore do not prevent... (read more)

Author: Robert Bell

13. Commercial and Industrial Air Curtains
September 24, 2009

Properly installed air curtains cut cold air loss and reduce humidity, thus reducing the load on refrigeration or air-conditioning plant and thereby saving energy by reducing compressor running time, maintenance, gas and recharging intervals. These units are an alternative to fast-acting roller doors and PVC slat curtains, and can be situated above or to the side of industrial doorways to create a powerful seal across the opening, keeping cold air in while providing complete visibility and access. This means that forklift drivers don't have to get out of their cabs to open and close doors s... (read more)

Author: Oleg Chechel

14. Roo Boxes
September 21, 2009

A mobile roo box is a very handy structure that makes the job of the weighing and storing of hunted kills a lot less cumbersome. It is essentially a cold room with some features added specifically for the work that has to be performed in it. The parts of a roo box include – The trailer – The trailer is the frame on which the room is constructed. It consists of galvanised rhs frame, galvanised rhs draw bar, led lights, 2 tonne coupling, 3 tonne springs and axels, mechanical over ride brakes, rear stands and rear step. The cold room – This is the functional area of the roo box... (read more)

Author: Nick Todd

15. China Refrigeration
September 18, 2009

As the world leading HVAC&R trade show, China Refrigeration features a wide range of exhibits, with the latest advances in technologies reflecting the most significant developments and achievements in the industry. China Refrigeration is an ideal marketplace for the companies in the industry to launch the latest products, technologies and to find what they want, for professionals to buy, sell and build up business network. It is an annual grand occasion for the industry to share their innovations, create market opportunities and to meet cooperation partners. Sanben Technology CO.,LTD will prov... (read more)

Author: Ricardo Liu

16. Important Things That You Must Learn About Industrial Freezer
September 17, 2009

One will find various needs for an industrial freezer in their businesses. Most businesses that handle large volumes of frozen food items and perishable products will definitely have one or more units of commercial refrigeration equipment in the business establishment. The main function of this cooling equipment in business is to keep large quantities of food stuffs in frozen state to keep them safe and fit to eat when they are purchased by their customers. At this point, it is important to note that there are basic difference between the commercial refrigeration equipment and household type. ... (read more)

Author: Ricardo Lumbardo

17. Understanding the Operating Principles of Industrial Fridge
September 15, 2009

A lot of business owners find difficulty in deciding on the right industrial fridge when considering the long term requirement of storage space for frozen stuffs. This class of commercial refrigeration equipment is classified into 2 categories. These are the reach-in type, which is the more common type of industrial refrigeration equipment and the walk-through type. It is essential that these freezer units operate just under 0 degrees C for proper storage of frozen food items. Under this condition, the evaporator must be well within the range of chilly temperature so that there is a cons... (read more)

Author: Ricardo Lumbardo

18. Practical Options for Your Catering Kitchen EquipmentYour Catering Kitchen Equipment
September 11, 2009

A practical and high quality catering kitchen equipment is essential for any food serving business. One cannot expect good performance from the food caterers if they don’t have the reliable and appropriate kitchen devices and utensils. A functional and complete set of these kitchen devices and utensils shall include refrigeration appliances, ovens as well as wide array of cooking utensils. On top of these essentials, you must also include in your list of must-have the cutleries, tableware and other cooking tools. The catering kitchen equipment does not only refer to those things that you... (read more)

Author: Ricardo Lumbardo

19. Restore Marketable Refrigeration Thermostats Yourself
September 08, 2009

There are two kinds of temperature controls used in moneymaking refrigeration: 1. Thermostatic: moreover an Air Sensing kind or Evaporator Coil Sensing kind 2. Low force control Let's begin with the thermostatic controls. An air-sensing thermostat only does that: it feels air warmth. The control feeler tube is frequently increasing in the evaporator housing. The evaporator is situated within the unit, frequently at the peak where the fan motor is built up. The thermostat has a direct sensor or capillary. The tube of capillary is built up on the exterior of the evaporator coil g... (read more)

Author: Francis Adam

20. Tip for running your air conditioner
September 10, 2009

Do you find your electricity bill expensive? If that is the case your air conditioner could be the main culprit. Most air con units are costly to operate as they use up a lot of energy. This is the reason why households with air conditioners installed customarily have much higher electricity bill. So in this case, how does one economize on your electricity bill? Now, here are three tips for you : 1. Use air conditioner only on hot and damp days. Try not to use air conditioners each day. If the weather is not particularly hot, employ a fan instead. When you are not using the air cond... (read more)

Author: Austin Sullivan

21. Tips for running your air conditioner
September 10, 2009

Do you find your electricity bill expensive? If so , your air conditioner may be the main culprit. Most air con units are costly to operate as they use up a lot of energy. This is the reason why households with air conditioners installed usually have much higher electricity bill. So in this example, how does one save cash on your electricity bill? Now, here are 3 tips for you : one. Use air conditioner only on hot and wet days. Try not to use air conditioners every day. If the weather isn't very warm, use a fan instead. When you are not using the air conditioner compressor, you are ... (read more)

Author: Xavier Mcconnell

22. Refrigeration Engineering Professionals are Skilled Workers in High Demand
September 09, 2009

Outside of a person who is educated in the industry, how many people do you think could honestly say that they know anything about refrigeration engineering? Most people couldn’t define ammonia refrigeration to save their lives. While engineering of this type isn’t the most glamorous job out there, it is highly sought after. So many people use the benefits of refrigeration engineering work without even thinking much about it. What is Refrigeration Engineering? Refrigeration engineering deals with a background science in the life of most average American people. The refrigerator isn’t jus... (read more)

Author: Caitlina Fuller

23. Looking for a Rewarding Career? Consider Industrial Refrigeration Systems
September 09, 2009

In this day and age, when you are looking to start a new career it is important to think of things using the bigger picture. While everybody wants to do what they know will be good for their pockets, it is also easy to want a rewarding career as well. Who wants to be stuck in a dead-end job that they know they hate? Life is about challenges, and if you need a new challenge and a new job, refrigeration engineering and industrial refrigeration systems may be the type of career for you. The topic of engineering can encompass a variety of industries. Refrigeration engineering is just one of m... (read more)

Author: Caitlina Fuller

24. Plan Well To Get Right Commercial Catering Equipment
September 02, 2009

So, you are interested in starting your own commercial kitchen. This is a great idea, especially because this business is not considered as one of the more prolific businesses. But, you should understand that though it seems like setting up a commercial kitchen is a simple thing, it is not. There are so many problems that can arise from time to time to make things difficult for you. Those problems should be identified to find a right solution. Actually, many people think starting a commercial kitchen is all about getting some commercial catering equipment and that’s it. The reality is a ... (read more)

Author: Robart Alex

25. Implementing A Restaurant Kitchen Design In Your Residential Kitchen
September 02, 2009

Kitchens, without a doubt, are the most important rooms in modern homes. It doesn’t matter if you spend a lot of time in kitchen, or not, the room should be according to the latest trends to add to the grace of your home. Considering this particular fact, many people are now trying different things to make their kitchens look attractive and functional as well. When it comes to functionality, it is easy to see many people opting for commercial kitchen designs. Yes, implementing a restaurant kitchen design in your residential kitchen is the latest trend. Though some people are still not co... (read more)

Author: Robart Alex

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