Deep Freezer

deep freezer is an electric refrigerator used for preserving foods, fruits and vegetables for long periods of time. Foods kept in a deep freezer can be preserved several times longer than a refrigerator’s freezer by keeping its freshness, texture and nutritional qualities. So it is better than regular freezing.

What is Deep Freezing?    

Deep-freezing is an industrial technique which involves cooling rapidly and brutally (a few minutes to an hour) food by exposing them intensely to temperatures from -30 ° C to -50 ° C, until the product core temperature reaches -18 ° C. With this process, the water contained in the cells is finely crystallized. The killing of cells and the proliferation of microorganisms are limited. The cells become dormant as result of the low-temperature. Thus the products treated retain their freshness, textures and flavours keeping their essential nutrients and vitamins.

To ensure optimum efficiency, deep-freezing equipment must be adapted according to the frozen food. It is therefore necessary to observe the freezing capacity given on the data sheet of the deep freezing unit (deep-freezer, blast chiller for trays or trolleys, deep-freezing tunnel).

Deep freezing equipment for food industry professionals and other sectors such as medical on request. Once the deep-freezing cycle is performed, products are transferred to a negative cold room or freezing storage system for storage.

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How does a deep freezer work?

Throughout history, people have sought ways to keep food cool to prevent spoilage and protect their health. One of the earliest strategies, first used in India several hundred years ago, was to harness the cooling power of evaporating water. As long ago as the 11th century, techniques had been developed to condense water vapor in coils, pressurize it and send it through an aperture to make it evaporate. Water isn’t a very good refrigerant, however, and these early cooling systems weren’t very efficient.

Fast forward to the 18th century, when inventors began building refrigeration systems by compressing air, ammonia and other gases and then forcing them to absorb heat by reducing the pressure and allowing them to expand. Refrigeration didn’t become viable on a large scale, however, until 1876, when German engineer Carl von Linde built a condensing system that could liquify these gases. Some 50 years later, General Electric ended the age of the icebox by marketing the first widely available refrigeration system, which used a proprietary gas known as Freon as the refrigerant.

Refrigerators and freezers are now commonplace and every household has one, although Freon is now obsolete. Most units have both a refrigerator and freezer compartment, but the cooling actually occurs in the freezer, and a fan circulates the cool air into the refrigerator compartment. Whether the unit is a small household appliance or a large commercial walk-in area, the cooling system works on the same basic principle of a deep freezer.

The Freezer Compressor Is the Heart of the Refrigeration System

The refrigeration system you see on a typical freezer has two sets of coils, the condenser coils and the evaporative coils, and they’re separated by a small aperture known as the expansion valve. If the freezer runs on electricity, which not all freezers do, an electric freezer compressor pump pressurizes the refrigerant in the first coil and that forces it to spray through the expansion valve into the second coil. Because the pressure in the second coil is much lower, the refrigerant evaporates, and that’s what provides the cooling.

In the language of chemistry, evaporation is an endothermic process, which means it absorbs heat. The heat comes from the surrounding air, and it provides the energy the refrigerant molecules need to enter the gaseous state. A freezer doesn’t so much add coolness to the air as it does subtract warmth from it, and that warmth has to go somewhere.

After turning into a gas, the refrigerant cycles back into the condenser coils where it gets pressurized by the condenser pump and turns back into a liquid. The pressurization generates heat, which completes the thermal cycle, and the heat must be dissipated away from the freezer compartment to maintain the low temperature in the freezer. Many units have a fan to facilitate this. The thermal cycle can continue indefinitely, provided the coils are sealed and none of the refrigerant can escape.

A Freezer Compartment Must Be Well Sealed

The deep freezer temperature can go down to 0 degrees Fahrenheit (-18 C) and even lower, but for this to happen, the compartment has to be well sealed. The evaporative coils are usually located behind the back wall of the freezer. As long as the compartment is sealed, the coils continue to absorb warmth from the freezer compartment and dissipate it through the condenser coils, and the temperature in the freezer continues to drop.

Most freezers have a thermostat that monitors the temperature. When the target temperature is reached, the thermostat signals the freezer compressor to shut off. If the compartment is well sealed and insulated, it takes a long time for the temperature to rise and for the compressor to cycle on. Poor door seals that allow warm air into the freezer compartment cause the compressor to cycle on more often, and this wastes energy.

Freezers Need Periodic Defrosting

One of the reasons you have a freezer is to make and store ice, but the ice should be in trays or bags, not on the freezer walls. When ice collects on the freezer wall next to the evaporative coils or the coils themselves, it interferes with airflow and reduces their cooling efficiency. As a result, the condenser has to work harder, and that wastes energy.

The working principle of a deep freezer is that the coils absorb heat from the surrounding air, but they can’t do this if they’re covered with ice or frost. This is why periodic defrosting is so important and why many freezers have an automatic defrost function. If a freezer doesn’t have a defrost function, it must be manually defrosted by turning it off long enough for the ice to melt.

When a freezer does have a defrosting mechanism, it usually takes the form of a heating element attached to the evaporative coil. The defroster may come on automatically or you may have to turn it on manually. Either way, it melts the ice on the coils and the water goes through a system of drainage pipes to a pan from where it can evaporate.

What Makes a Freezer Different From a Refrigerator?

Most refrigerators come with an attached freezer and they’re in separate compartments. The ideal deep freezer temperature is around 0 F (-18 C), but in the refrigerator compartment, it’s more like 40 F (4 C). To maintain this temperature difference, the compartments are separated by a vent opening and a fan blows cool air from the freezer into the refrigerator only when it’s needed.

You regulate the temperature in the refrigerator compartment by adjusting the operation of the fan. If the door seals and insulation are intact and the freezer is at the proper temperature but the refrigerator is too warm or too cold, the reason is usually a fan malfunction. If the freezer temperature is higher than it should be, however, it’s usually the condenser that’s at fault, and that’s a more serious problem.

The Advantages of Deep Freezer

Deep Freezer is a type of freezer with the storage of large quantities of food items. Deep freezer maintains the constant temperature of zero degrees of Fahrenheit. Because the frozen food should not keep at the place where the temperature is more than 40degree celsius. The question arises now that the refrigerator freezer is great enough for storing frozen food why do we need the deep freezer. The answer is refrigerator is not with a large amount of space and specific features for maintaining right temperature for frozen temperature.

What are the benefits of the Deep freezer

The very important thing is it helps us to maintain a large number of food items in a specifies temperature. We can buy the food item in bulk for our future purpose, the deep freezer doesn’t spoil the food taste and also helps to reduce the amount of food waste in our home.

Medical Uses

Deep freezer not only helps to store the food items but also help to store medicines. Because of some medicines need to be stored in right temperature otherwise it leads to some other negative results. So that deep freezer helps us in all the way of storage items without spoiling them.

Various features

The deep freezer has the various kinds of features like maintain the particular temperature includes manual setting and automatic settings. It gives some alarm or notification once the system creates the malfunction. It requires minimum space for store large amount food items.

ultra-low-temperature-laboratory-freezer

Differences Between Fridge Freezers & Deep Freezers

Freezer or deep freezer? Which should you buy? What is the difference between the two? Either of these types of freezers will be your friend when that chicken goes on sale. Both will do a good job of preserving your leftovers, making sure your family eats nutritional meals without you having to spend all day, every day in the kitchen. But there are important differences to consider.

Freezing vs. Deep Freezing

First, let’s get some terminological confusion out of the way. The terms “freezing” and “deep freezing” originally referred to two different methods of preserving food. Both processes freeze the food to the same temperature (-18 °C), but they achieve it in two different ways. With freezing, the temperature of the food is decreased slowly, usually up to 24 hours. Deep freezing refers to a process where the food is exposed to a temperature from -30 °C to -50 °C so that the core of the product reaches -18 °C within an hour. Deep freezing is a method typically used in industrial settings. It is considered to be better than regular freezing in allowing the food to preserve its freshness, texture and nutritional qualities.

Today, however, the term “deep freezer” refers to a type of freezer that’s opened like a chest, as opposed to an upright freezer on top of the refrigerator. Although the two can maintain the same temperature (and most modern models have a temperature control setting), there are some important differences between the two.

Configuration and Capacity

Unlike a freezer that is located at the top of a refrigerator and has the capacity of up to 150 litres, deep freezers open horizontally and typically have the capacity from 100 litres up to 510 litres. Unlike upright freezers, deep freezers don’t come with shelves or drawers. This makes it harder to find and organize things, but does make them better suited for storing large items, such as a whole moose head.

Energy Efficiency

A deep freezer is more energy efficient than an upright freezer, using about 10 to 25 percent less energy. There are two reasons for this: It is generally better insulated and, because the door is opened less frequently, it doesn’t lose as much cold air as an upright freezer.

The Bottom Line

So which kind of freezer is best for you? It depends. If you have a small family and don’t have any extra space, a regular freezer will likely suit your needs. However, if you have many mouths to feed or have room to spare, you will do well to purchase a deep freezer.

Similarities

Now that we’ve seen all of the differences between home freeze dryers and lab freeze dryers, it’s worth noting the ways they are alike. They are both designed to remove moisture for long-term storage of samples. Both use a vacuum pump, though the home pump is smaller and provides less vacuum than lab freeze dryers require. They also share some similar design traits. Home freeze dryers are designed like a lab’s bulk tray dryer with multiple shelves to place the food (samples) for lyophilizing.

How Long Does It Take for a Deep Freezer to Start Working After Defrosting It?

You can freeze dry a wide variety of fruits, vegetables, and meats — Things like apples, peaches, strawberries, bananas, tomatoes, avocados, green beans, peppers, onions, potatoes, spinach, shrimp, chicken, turkey, pork, beef, lobster, and more. Even your favorite meals and desserts can be freeze dried! Lasagna, spaghetti, casseroles, macaroni & cheese, chili, soups and stews, steak, pork chops, pasta sauces, cheesecake, pudding, and pie filling to name a few. You can even freeze dry dairy and egg products too! Ice cream, cheese, yogurt, raw eggs, scrambled eggs, omelets, and so much more! Create healthy, allergen-free and inexpensive snacks or pureed baby foods. Kids of all ages love the taste and texture of freeze-dried foods. And don’t forget about your pets! Homemade pet food and pet treats can be far healthier, tastier, and less expensive than commercially produced pet foods.

Stabilized Freezer Temperature

During your defrosting ritual, your freezer temperature will warm up — it’s the only way to get the ice to melt so you can remove it. However, each person’s methods, the temperature of the air surrounding it, and even the type of freezer itself can slightly influence how much the freezer warms. Defrosting a freezer in the middle of a sweltering summer day, for instance, will likely produce a much warmer freezer interior than doing it on a cool winter day when the air temperature is much lower.

Once you plug in the freezer afterwards, it immediately begins to run and cool. As with a brand new freezer, it will take several hours for the temperature to stabilize at 0 degrees Fahrenheit. Replacing frozen foods after the first 20 or 30 minutes will help lower the temperature more, similar to adding ice to a cooler. It may take anywhere from 4 to 12 hours to reach and stay the proper temperature, however. Use a thermometer to monitor the freezer temperature and determine the time needed for subsequent defrosts.

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