Cordon Noir Education / Professional Chef 
Chapter
3
Kitchen
Organization
Rank/
Duties/ Mise-en-place
Kitchenware/
Gastro-Norm
Utensils/
Knives
Cooking
Apparatus
Machines/
Refrigeration
Foodservice
organizations vary in terms of function and size and each must
have its own organization structure. The needs and sizes of food
production units in restaurants, hotels, hospitals, extended care
facilities and collages and universities will differ; the
organization system for each, however, are much the same.
The
location of the foodservice department in the organizational
structure of the facility is significant. The department should
be close to top management because of its complex nature and
importance.
The goals of
a well-organized kitchen are:
·
Efficient work flow
·
Effectively planned work area
·
Correctly planned equipment and appliances appropriate for the
size of the establishment
·
Maximum use of skilled personnel
The
organization of the kitchen depends on the following:
·
Type of establishment
·
Size of establishment
·
Location of establishment
·
Kitchen type
·
Kitchen staff (brigade)
·
Type and method of customer service
·
Extent of the menu
·
Operating hours
The following six kitchen types dictate
different organization systems:
1.
Conventional kitchen
2.
Combined preparation and finishing kitchens
3.
Separate preparation and finishing kitchen
4.
Open or show kitchen
5.
Fast-food kitchen
6.
Industrial kitchen
After this information has been provided,
the kitchen can be planned in one of the following ways:
In selecting one of these types of
kitchens, consideration should be given to:
·
Number of meals to be prepared at each meal period
·
Type of service
·
Customer prices
·
System for serving the meal
·
Serving times
·
Room service 24 hrs.
After determination of these factors, it
should be possible to select a kitchen plan that practical and of
appropriate size. The kitchen plan must also provide:
·
Flexibility related to the location and the size of the rooms
·
Efficient work flow
·
Provision for receiving incoming goods
·
Supplies/ storeroom
·
Adequate refrigeration
·
Preparation kitchen (hot, cold, pastry)
·
Finishing kitchen
·
Sufficient service area
·
Ware washing areas
·
Scullery
·
Secure flatware storage
The kitchen staff can be efficient only if
the Work Flow has been properly planned.
Technical Kitchen Planning
After
the type of foodservice and the organizational structure
of an establishment have been determined, the planning of the
kitchen my begin. Even though an architect may have expertise in
kitchen planning a professional foodservice facility designer
should also be assigned to the job. In addition to standard
design concerns, the following areas require additional
discussion:
·
Optimum size ration among the individual rooms
·
Proper positioning of the equipment in work area
·
Good illumination of the hot and cold sections, including
installation of range hoods above cooking surfaces to control
smoke and steam
·
Working diagrams for the utilities, water, and waste installation
·
Equipment that conforms to sanitation codes
·
Materials for no slip floors
·
Washable wall and ceiling surfaces
·
Drainage systems under sinks and washbasins and under cooking
equipment where necessary
·
Conformance to building codes
·
Conformance to health administration and other safety standards
Before kitchen
planning can begin, planning checklists must be prepared to
ensure that no requirement is left out. Such checklists must
contain each and every part of the kitchen(s) and annexes.
The professional
kitchen consultant or designer is responsible for translating the
specified requirements into building and installation plans.
He or she is also responsible for
reconciling the technical requirements of the building,
sanitation, heating, ventilation, refrigeration, and utility
installation with the relevant official regulations. The state or
local codes and standards for foodservice establishments must
also be met. Only by seriously planning the kitchen in
conjunction with the demands and desires of the professional
staff can there needs be satisfied in a kitchen that functions
efficiently and economically. Independent foodservice designers
and the planning departments of foodservice equipment
distributors can recommend building constructors, professional
foodservice personnel, and architects who are qualified to assist
with planning
Basic research and a professional kitchen
planner are essential in developing kitchen designs and layouts.
The following guidelines should be followed:
·
Throughout the stages of planning, you must make sure that the
kitchen concept is adhered to. Sometimes portions get or changed
between the plan and the drawing board.
·
Make sure that all regulations are followed
·
Let a professional kitchen planner check your plan; he can
save you a lot of worry later
·
Use standard sizes as much as possible when choosing
transport, racking and storage equipment
·
Look at the future when planning kitchens; do not build only
for today make it your business to know how kitchens should
function tomorrow and beyond
·
Think about routing- efficiency through short walking distance
for the kitchen staff. Food items should not travel up and down
the kitchen, but go in a logical straight line from storage to
preparation to finishing and service
·
Plan for labour saving. Aim for maximum efficiency and
production with minimum effort, thus saving labour
·
Good planning will facilities right up to the point where the
meal is issued and served
·
After good planning comes choosing the right equipment and
correct tools
Kitchen can be grouped into three main
types, reflecting various demands.
For small hotels and restaurants that have flexible standards for menus and portions, all departments are grouped together in blocks. Both preparation and finishing are carried out in the same areas. All hot dishes are served at one counter in the kitchen.
Separated Preparation and Finishing
Kitchen (Satellite)
This system
is preferred for larger establishments. The
preparation and finishing blocks (satellite kitchens) are in
separate rooms. Each satellite kitchen should consist of one room
housing all the departments necessary for the dishes on the menu.
Usually, these have no large ranges, frying pans or tilting
stockpots. Instead, there are grills and griddles, microwave and
convection ovens, Bain Marie and fryers. The cold and pastry
sections generally include only refrigerators for storage of
partially and totally finished foods.
Fast Food Kitchen
This system is of
interest to establishments that have no preparation kitchen and
purchasing only convenience foods. Kitchens of this type require
refrigerated and dry storage areas, a preparation section for
convenience foods in-corporations with microwave and convection
oven and deep fryers. The cold food and pastry section consists
only of storage rooms and equipment for refrigerating prepared
foods. Space for washing and preparing ingredients is necessary
in locations where pre-prepared fresh salads cannot be supplied.
Receiving
Storage
Preparation
Service
Counter
Dining Area
Organization of Kitchen
In
the hospitality industry, the kitchen is one of several
departments. A productive and profitable operation requires the
team effort of all departments. The employees of the operation
form a mutual partnership. Open communication, clear directives
and goals, a positive work environment and personal commitment
are essential to success. The kitchen and service departments are
should working in harmony to archive maximum results and guest
satisfaction.
Basic Kitchen and
Service Chart:
Kitchen
|
Service
|
Executive
Chef
Executive Sous Chef |
Maitre dhotel (Host/hostess) |
Sous chef |
Captain
|
Chef de partie, demi chef d
p Commis |
Wait
personnel
|
Apprentices |
Bus
staff/apprentices/(trainees) |
The kitchen
staff is a working team of trained cooks and assistants managed
by the
Head
chef. The size of the staff is usually determined by the
following factors:
·
Type and size of establishment
·
Organization of establishment
·
Equipment
·
Hours of operation
·
Menu
The
classification of the kitchen staff depends on the type of
kitchen organization. It can be organized as:
·
Traditional (conventional) kitchen
·
Combined production and finishing kitchen
·
Separate production and finishing kitchens
·
Open kitchen
·
Fast-food kitchen
·
Institutional kitchen
The
allocation of duties (rosters and duty schedules) also depends on
the type of kitchen organization. Regardless of the type of
operation, however, an ideal working environment depends on
management with tact and empathy and teamwork.
Small kitchen Staff (up to 6 cooks) |
Medium-sized Kitchen
Staff (7 14 cooks) |
Large Kitchen
Staff
(more than 15 cooks) |
Head chef |
Executive
chef
|
Executive
chef
|
Station cooks |
Station chefs |
Sous chef |
Assistant cooks |
Assistant cooks |
Station chefs |
Apprentices |
Apprentices |
Assistant cooks |
|
|
Apprentices |
Ranks and Kitchen Departments
Functions
In
principle, the ranks of dose in the profession are the same for
both conventional and modern kitchens. Only the duties and
functions of the cooks differ. Job responsibilities depend on the
cooks rank and position and his or her experience.
In
Europes Hospitals, nursing homes and health spa facilities,
dieticians and cooks with training and experience in the
preparation of special diets are usually part of the kitchen
staff.
Culinary
Education
Becoming a cook in many countries in Europe requires a three-year apprentice ship combined with attendance at a culinary trade school and passing a final exam. To qualify for a position in a setting that requires special diets, an additional year of formal apprentice ship training is required. An advanced professional degree with the title of chef is awarded after further education, with final exam administered by the states. The highest rank is that of diploma (master chef). Professional titles are protected by low.
| Position |
Duties
|
| Chef-
Chef de cuisine (with diploma) Executive Chef |
Responsible
for all kitchen operation
|
Chef-
Chef de cuisine
|
Responsible
for all kitchen operation |
| Sous-chef
(second in command)-Sous-chef |
Second-in-command,
fills in for the chef |
| Station
chefs- Chefs de partie |
Line
cooks, supervising at least one staff |
| Station
cooks- Cuisinieur de partie |
Lone
cook, supervising no one |
| Independent
cook- Cuisineur seul |
Cook
working alone |
| Assistant
cooks- Commis |
Inexperienced
cooks, supervised by station chefs |
| Apprentices-
Apprentis |
Apprentices
training in a kitchen and attending trade school to
become a chef |
| Position |
Training |
Hospital
or institutional chef- Cuisinier dhotel
|
Cook
or diet cook, who has passed exam for hospital cooks |
| Dietitian-
Dialectician |
Three
years special training, certified by the Swiss Red Cross |
| Diet
cook- Cuisinier en dietetique |
Trained
cook with one year of special training in diet
preparation |
The various kitchen
departments have special duties. These duties should be
coordinated with clear and specific directives. Flexibility is
essential in todays kitchens; the function of each
department and individual duties should at all times meet the
needs of the organization.
Kitchen Departments and their
Functions
Position |
Duties |
Executive
chef/ Chef de cuisine
|
Manages
the whole kitchen and supervises kitchen staff Prepares rosters and assignments Plans and designs menus Handles purchasing and controls Performs cost calculations Trains apprentices Responsible for sanitary conditions Responsible for preparation and
presentation Communicates (visits) with guests |
Sous-chef/
Sous-chef
|
Takes
on the responsibilities of the executive chef when absent Also responsible for apprentice
training Often also holds a station chef position |
| Sauce
cook/ Saucier |
Prepares
sauces, meat, game, poultry, fish and warm appetizers |
| Broiler
cook/ Rotisseur |
Responsible
for the preparation of grilled dishes and roasts and of
dishes that are both oven-roasted and deep-fried |
| A
la carte cook/ Restaurateur |
Only
in very large kitchen brigades Responsible
for a la carte preparation |
| Fish
cook/ Poissonnier |
Only
in very large kitchen brigades, to relieve the sauce cook Preparation fish and seafood dishes |
| Vegetable
cook/ Entremetier |
Prepares
soups, vegetables and potatoes, pasta, cheese and egg
dishes Prepares spa cuisine, health -
food diets and vegetarian dishes |
| Pantry
chef/ Garde-manger |
Monitors
all cold-food preparation and controls freezer and
refrigeration rooms Bones and
portions meat, game, poultry and fish Prepares salads, cold appetizers,
sauces and cold buffets In large kitchens cold dishes are
prepared by an apprentice cook (hors-deuvrier) |
| Butcher/
Boucher de cuisine |
Only
in large kitchen to ease the work of the pantry chef Bones and cuts raw meat |
| Pastry
chef/ Patissier |
Prepares
all pastries and desserts; sometimes also warm pasta
preparations or hot dishes involving pastries (e.g., beef
Wellington) |
| Swing
cook/ Tournant |
Works
as needed in all stations of the kitchen and replaces
station chefs on their day off |
| Duty
cook/ Chef de garde |
Responsible
for the kitchen when the staff is not present, during
off-peak hours Prepares dishes
ordered during those times and does mise en place |
| Dietician/
Dialectician |
Advises
guests with special diets and nutritional requirements Plans and performs cost calculations of
special diet menus Prepares dietary dishes |
| Staff
cook/ Cuisinier pour le personnel |
Only
in very large foodservice operations Prepares
meals for staff |
Mice-en-Place
is pre-preparation and is the first step in the
preparation of dishes or products. A properly organized kitchen
has a correct mice-en-place routinely set up in all
departments and at each post.
The saying
A good mice en place is half the cooking is as
true for small kitchens as it is for large preparation and
finishing kitchens.
Cleaning and
closing a workstation, including checking stored products,
cleaning equipment and work areas, and performing necessary
repairs, is also a part of mice- en-place. The general
term of mice-en-place encompasses everything from the arrangement
of the utensils and ingredients to the presentation of the finish
product.
Basic
Mice-en-Place
Basic
mice-en-place involves assembling the
necessary utensils, food in gradients and linens needed to
perform cooking duties.
Daily and
Station Mice-en-Place
Station
mice-en-place reflects the daily menu,
including any specials offered, banquets or other special
preparation duties. All utensils and ingredients (clean and cut
as needed) are put in the days dishes. Daily mice
en place includes the control of ingredients. As an
example, the miceen-place of
ingredients for the sauce cook would encompass: fats (oil,
butter, margarine), flour, corn or potato starch, fresh bread
crumbs, white & red wine, lemon juice, chopped onion, parsley
etc.
Mice-en-Place of Production Kitchen
The
mice en place of the production kitchen is
based on the needs of the daily menu and the station
mice-en-place with an emphasis on food preparation.
Mice-en-Place of the Finishing Kitchen
The
mice- en- place of the finishing kitchen is based on
the daily menu and the station tasks with an emphasis on
reconstitution and presentation. Most of the foods have been
partially or fully prepared in the production kitchen.
Mise-en-place is merely organizing and completing in
advance all the preliminary tasks involved in the preparation of
a meal. Whether the mise- en- place is carried out for a
conventional kitchen, a preparation kitchen or a finishing
kitchen, prelim work must be completed methodically and carefully
before further work in the kitchen can be executed. When
observing the work of various chefs on the kitchen staff it is
easy to recognize those who have the ability to organize their
work in conjunction with a correct mise-en- place. When a
kitchen is properly organized, the routine mise en place for the
various departments is in written form. Department chefs should
be able to give the assistant exact instructions for the daily mise-en-place
on the basis of the recipe and the menu plans. The saying
a good mise-en-place is half the cooking
applies to small kitchens as well as to large preparation and
finishing kitchens. The aim of an exact mise-en-place is
to complete all the preparatory operations before the actual
cooking begins. The cooking process is then simplified and
unexpected orders can be filled easily and promptly. Before the
service begins, each member of the cooking staff should allow
himself sufficient time to check his mise-en-place
thoroughly- only in this way can the service be completed in an
organized manner?
We prepare a Mise-en-Place according
to the following Menu:
Menu
1. Mise-en-Place
of
Potage
bonne femme
cooking utensils
**
Sauté
de veau
2. Mise-en-Place
of
au
madere
the chefs tools
Spaetzli
Epinarde
en feuilles
3. Mise-en-place
of
**
the food
Salade
de fruits
4. Mise-en-place
of
the serving dishes
Proper
Mise-en-Place set-up:
Pots
and pans can be made of various materials. Materials for
foodservice equipment should be appropriate for the specific use.
The material must meet certain minimum requirements as
established by the joint committee on food equipment standards.
Only such
materials shall be used on the construction of foodservice
equipment as will withstand normal wear, penetration of vermin,
the corrosive action of foods or beverages, cleaning compounds
and such other elements as my be found in the use environments
and will not impart an odour, colour or taste to the food.
Ø
Stainless Steel
Stainless
steel is a no corrosive metal that is used more extensively than
any other in the foodservice industry. Alloys of nickel, chromium
are combined with steel and used for the manufacture of all kinds
of equipment. It is made of 72 % steel, 18 % chrome and 10 %
nickel, this formula is called 18/10. Manufacturers may vary the
formula slightly.
Stainless
steel has many outstanding qualities that make its use important
in foodservice. Its strength, attractive appearance, permanence,
smooth, hard equipment, serving counters, heavy-duty equipment,
tables, machines. It is also used for kitchen utensils, pans,
inserts for serving counters and tableware. Pans made of polished
stainless steel are not recommended for certain uses, such as the
preparation of omelettes, as the food tends to stick to the fine
pores of the metal. Other important features of stainless steel
are its resistance to stain, scratches, and corrosion, its ease
of cleaning and the availability of different finishes, ranging
from dull to bright. It is resistant to any chemical reaction
with foodstuffs and may be used for all food preparation
processes at any temperature. These characteristics are
particularly significant for the foodservice industry, where
sanitation
and safety are of utmost importance.
Ø
Iron
Iron is
used for large pieces of equipment such as ranges and ovens. It
is also used for griddles, grills, and frying pans. It conducts
heat very well, but iron pans are heavy and difficult to clean.
Ø
Copper
Copper kitchenware
was very popular in the kitchens of long ago. Traditional chefs
have been reluctant to give up their shinning copper kitchenware
because of its high conductivity, its attractive appearance, and
its resistance to corrosion. Copper cooking utensils must be
lined with stainless steel or tin to prevent reaction of
foodstuffs with the cooper. The high initial costs, the
heavyweight, the cost of replacing the linings, and the
maintenance costs have limited the use of copper utensils in
todays kitchens. These utensils are frequently used in
display cooking and decorative purposes and sugar boiling.
Ø
Aluminium
Aluminium is a
lightweight metal that is less expensive than other materials. It
has high heat conductivity and is relatively easy to clean. Food
with high acid and/ or alkali content attack pure aluminium. The
surface of aluminium can be treated to be more resistant to
corrosion, discolouration-this treatment is called anodising.
Ø
Plastics
Plastics are
lightweight and have only limited use in the kitchen. There are
two main groups: Thermo durable and Thermoplastic. The former is
harder and more resistant to heat and unbreakable, the latter,
softer and less heat resistant. Plastics are most useful for
storage and in the Cold kitchen (garde-manger).
Ø
Non-stick Materials
Food can be fried
without using fat or butter and does not stick to the pans. The
material can starch easily, especially in commercial use.
Ø
Glass, Porcelain and Ceramic
These have limited use
for commercial kitchen equipment because they are breakable. They
are often used as protective linings in equipment to prevent
absorption of colours and flavours and metallic contamination.
Glass is hard and resistant to acids and very high temperatures.
The materials are easily cleaned and attractive.
Ø
Silver
Silver is a precious
metal, and its cost makes it prohibitive for use in commercial
foodservice. Silver plate is also costly: however, it is
occasionally used for flatware, such as knives, forks, spoons,
and for hollowware including coffee servers, teapots, pitchers,
sugar bowls, sauce boats and silver platters. These items, often
referred to as hotel silver are covered with a thick
layer of silver plating> This sign 90 means 12 spoons and 12
large forks contain 90 gr of pure silver.
Cookware
Pots and pans are available in
different shapes and sizes for specific uses.
Part A
Part B
Ø
Sauteuse
§
-----------------------
Ø
Sautoir
§
-----------------------
Ø
Stewing Pot/ Rondeau
§
-----------------------
Ø
Roasting Pan/ Rotissore
§
-----------------------
Ø
Braising Pan/ Braisiere
§
-----------------------
Ø
Stock Pot w/Handle/ Casserole a Manche
§
-----------------------
Ø
Low Stock Pot/ Marmite Basse
§
-----------------------
Ø
Double Size Stock Pot/ Marmite Haute
§
-----------------------
Ø
Pressure Cooker
§
-----------------------
Ø
Fish Kettle/ Poissoniere
§
-----------------------
Ø
Couscous Pot
§
-----------------------
Ø
Sugar Pan
§
-----------------------
Ø
Frying Pan/ Poele Noir (Lyonnaise)
§
-----------------------
Ø
Crepe Pan/ Poele a Crepe
§
-----------------------
Ø
Non-Stick Pan/ Poele Teflon
§
-----------------------
Ø
Grill Pan/ Poele a Griller
§
-----------------------
Foodservice has its standards in place. The impetus for standardization came from the Swiss. Representatives of several foodservice organizations in Switzerland met in Zurich to sign a document that would standardize domestics for all movable inserts for food dishes and utensils, such as pans, trays, wire racks, drawers and trolleys, and also for kitchen equipment and refrigerators
Originally, the representatives had planned to create a new Swiss standard. But these plans were dropped in favour of the basic size of 530 mm by 325 mm, already the dimensions of standard American pans. The new standard was named Gastro-Norm. Foodservice groups and manufactures throughout the world have adopted this standard.
The food can remain in uniformly dimensioned containers from the time it is received throughout the entire operation (preparation, finishing, service, storage).
The Standardization has many
Applications in Foodservice:
|
|
Applications
Pressure- cooking equipment
------------------------------
Fryers
------------------------------
Ovens
------------------------------
Walk-in and reach-in refrigerators ------------------------------and
freezers
Bain- marie and steam tables
------------------------------
Storage units
------------------------------
Food lifts
------------------------------
Self-service buffets
------------------------------
The
foodservice operator who adopt the Gastro-Norm standard can:
Ø
Speed operating procedures
Ø
Increase stacking volume in small areas
Ø
Simplify internal transportation system
Ø
Reduce working distance for staff and employees
Ø
Allow universal use of the transport and storage units
Ø
Reduce labour cost
Ø
Standardize service ware
Ø
Permit interchange-ability of units GN
Kitchen utensils are tools used daily in commercial kitchens.
They must be scrupulously clean and in excellent working order.
They should be cleaned immediately after each use and returned to
their proper place.
They are grouped as follows:
Ø
Knives
Ø
Kitchen utensils
Part B
Part C
Part D
Ø
Flat Skimmer
Deep Skimmer
Ø
Soup Ladle
Sauce Ladle
Ø
Spider
Reducing Spatula
Ø
Fish Spatula
Whisk
Ø
Wooden Spatula
Chinois
Ø
Fine Chinois
Wooden Sieve (Tamis)
Ø
Etamine (Cheese Cloth)
Spaetzli Sieve
Ø
Food Mouler
Mandoline
Ø
Graters
Colander
Ø
Bain-Marie
Branks, G-N. Containers
Ø
Rubber Spatula
Mixing Bowl
Ø
Potato Spider
Piping Bags, Nozzles
Ø
Can Opener
Steel Brush (cleaning chopping
block)
Ø
Plastic Chopping Block Egg Cutter
Ø
Gastro-norm Trolley
Storage Container
1.
If carried, the knife point must be held downwards
2.
Placed flat on the table, blade downwards
3.
When using knives, keep your mind and eyes on the job
4.
Use the correct knife for the correct purpose
5.
Never leave knives lying in the sink
6.
Always keep knives sharp and clean
7.
A good knife is a good friend but it can be a dangerous weapon!
Ø
Boning Knife
Salmon Slicer
Ø
Chefs Knife
Slicer Knife
Ø
Decorating Knife
Steel
Ø
Fillet Knife
Spatula
Ø
Paring Knife
Sausage Fork
Ø
Apple Corer
Meat Fork
Ø
Butter Curler
Double
Baller
Ø
Lemon Decorator
Lemon Zester
Ø Orange Peeler
The stove is the central preparation area for all hot meals. It consists of hot plates, ovens and gas burners, bain-marie and rechaud.
Ø
Gas
Ø
Electric
Ø
Combined
Ø
Covered gas (Coup de feu)
The system of the stove is dependent on the type of establishment the local conditions also have to be thoroughly examined.
The stove must be cleaned after every
service.
The hot plate must be greased after it
has been cleaned.
Dirty gas burners must be soaked in
acidic water overnight.
Combined Gas
and Electric Stove
Gas- Stove
Electric Stove
Covered Gas
(Coupe De Feu)
Conventional
Oven
Stock Pot
Burner
Convention Oven
Convention
Steamer
Tilting Stock
Pot- Direct Heat or Indirect Heat
Tilting Pan
(Brat Pan)
Pressure Cooker
Tilting
Pressure PanVaro-Steamer
Grills-Hal
Grill, Half Griddle
Griddle
Salamander
Microwave Oven
Deep Fat Fryer
Toaster
Kitchen
Food Processing Machines
Ø
Combination Machine (All Purpose)
-Stainless
steel basin with whisks, beater, dough hook
-Vegetable
mouler
-All purpose
grater / cutter with 3 grating discs and 1 cutting disc
-Meat mincer
with 4 different discs
Ø
Bone-cutting Band Saw
Ø
Chopper Table-Top
Ø
Vacuum Packing Machine
Ø
Slicing Machine
Ø
Blitz Blending Machine
Ø
Blender
Ø
Fruit Juice Machine
Ø
Pasta Making Machine
Ø
Cream Dispenser
Ø
Mechanical Weighting Scale
Ø
Wall Bracket Scale
Ø
Electrical Weighting Scale
Ø
Potato Peeler
Ø
Electrical Bone Saw
Ø
Crushed Ice Machine
Ø
Salad Dryer/ Salad Washer
Ø
Vegetable Cutter
Refrigeration storage requirements are increasing with the use of more perishable, frozen and prepared food. These foods require storage temperatures that will preserve their quality and nutritive value and safeguard against loss from bacterial growth.
Fundamentally, removing heat creates cold. The principle of mechanical refrigeration is based upon the evaporation of a liquid (freon) refrigerant inside a sealed circuit and the re-condensation into a liquid. In order to evaporate, the gas removes heat from the chilling compartment. Every refrigeration and deep freezing plant should be equipped with an automatic defrosting devise. The ice that forms around the cooling element acts as insulation, delaying or even stopping its passage to the compressor. Each refrigerated area should be equipped with a thermostat to control its temperature.
There are basically two types of compressors for refrigeration equipment air-cooled and water-cooled. Air cooled equipment must be installed in a well-ventilated room to ensure the fresh flow of air. An automatic ventilation system can act as an aid. Water-cooled equipment requires relatively little space, but the water consumption is in direct ratio to its performance. The choice of one or the other of these two systems cannot be made until the local conditions have been thoroughly examined. Most compressors today are either partially or totally hermetically sealed. So that the electric motors rarely need servicing.
|
|
The design of refrigerated areas is dependent upon the type of establishment: hotel, restaurant, canteen, hospital or college. Each of these has its own specific requirements, and these must be considered when planning the size of the rooms, the length of time the goods will be stored, and the cooling procedure to be used- fast chilling, blast-freezing and frozen storage.
Refrigerators and freezers should be constructed in blocks, possibly placing the freezer in the centre. His type of construction offers advantages from the technical and insulation standpoint and in terms of construction and costs. The storage rooms for fruit and vegetables, fish and meat should be equipped with humidifiers.
The operational system must be determined before planning the walk-ins. These details will be necessary for calculating capacity and performance. Walk-ins must not have any steps so that trolleys can be pushed in with ease. Sufficient space must also be considered in the case of expansion.
Refrigerators
and Standardized Refrigerated Units
All modern refrigerators, refrigerated units and refrigerated chests are standardized according to the accepted norms (Gastro-norm). All these units may be fitted with drawers to accommodate the gastro-norm inserts for the safe storage of food. The fan-cooling system is absolutely necessary to achieve sufficient airflow in these very compact units.
Storeroom
Temperatures and Humidity
For ideal temperatures and humidity levels according to type of food.
Temperature
Relative Humidity
C
%
Meat
and Sausages
0 2
80 85
Fish
in ice in refrigerator
-1 2
80 100
Milk,
Butter, Cream, Cheese
1 - 3
75
Fruits
and Vegetables
4 - 6
80 90
Potatoes,
Bananas, Papaya
7 - 9
60 75
Daily
Fridge
3 - 5
70 75
Pastry
Products
4 6
65 70
Frozen
Products
-20 22
-
Beverages
7 13
-
Industrial
Food Freezing Processes
Ø Blast- freezer process
Ø Multiple- plate contact process
Ø Tunnel process
Ø Flow- freezer [process
Ø Liquid nitrogen spraying process
Diagram of
Refrigeration