1、16.1CHAPTER 16FOOD SERVICE AND GENERAL COMMERCIAL REFRIGERATION EQUIPMENTRefrigerated Cabinets . 16.1Food Freezers . 16.3Blast Chillers and Blast Freezers . 16.3Walk-In Coolers/Freezers . 16.3Vending Machines. 16.5Ice Machines . 16.6Preparation Tables 16.7OOD service requires refrigerators that meet
2、 a variety of needs.FThis chapter covers refrigerators available for restaurants, fast-food restaurants, cafeterias, commissaries, hospitals, schools, con-venience stores, grocery stores, and other specialized applications.Many refrigeration products used in food service applications areself-contain
3、ed, and the corresponding refrigeration systems are con-ventional. Some systems, however, do use ice for fish, salad pans, orspecialized preservation and/or display. Chapters 15 and 17 havefurther information on some of these products.Generally, electrical and sanitary requirements of refrigeratorsa
4、re covered by criteria, standards, and inspections of UnderwritersLaboratories (UL), NSF International, and the U.S. Public HealthService.REFRIGERATED CABINETSReach-In CabinetsThe reach-in refrigerator or freezer is an upright, box-shapedcabinet with straight vertical front(s) and hinged or sliding
5、doors(Figure 1). It is usually about 2.5 to 3 ft deep and 6 ft high and rangesin width from about 3 to 10 ft. Capacities range from about 20 to90 ft3. Undercounter models 3 ft high with the same dimensions arealso available. These capacities and dimensions are standard frommost manufacturers.The typ
6、ical reach-in cabinet is available in many styles and com-binations, depending on its intended application. Other shapes,sizes, and capacities are available on a custom basis from somemanufacturers. Chapter 15 discusses display cabinets in great detail.There are many varied adaptations of refrigerat
7、ed spaces for stor-ing perishable food items. Reach-ins, by definition, are medium- orlow-temperature refrigerators small enough to be moved into abuilding. This definition also includes refrigerators and freezersbuilt for special purposes, such as mobile cabinets or refrigeratorson wheels and displ
8、ay refrigerators for such products as beverages,pies, cakes, and bakery goods. The latter cabinets usually have glassdoors and additional lighting to illuminate the product. Candyrefrigerators are also specialized in size, shape, and temperature.Refrigerated vending machines satisfy the general defi
9、nition ofreach-ins; however, because they also receive coins and dispenseproducts individually, they are classified separately. Generally, thefull product load of a vending machine is not accessible to the cus-tomer as in normal reach-in cabinets. Beverage-dispensing units dis-pense a measured porti
10、on into a cup rather than in a bottle or can.Reach-in refrigerators have doors on the front. Refrigerators thathave doors on both front and rear are called pass-through or reach-through refrigerators (Figure 2). Doors are either full height (oneper section) or half height (two per section). Doors ma
11、y have win-dows or be solid, hinged, or sliding.Roll-In CabinetsRoll-in cabinets are very similar in style and appearance toreach-in cabinets, but vary slightly in construction and functional-ity. Roll-ins (Figure 3) are usually part of a food-handling or otherspecial-purpose system (Figure 4). Pans
12、, trays, or other speciallyThe preparation of this chapter is assigned to TC 10.7, Commercial Foodand Beverage Cooling, Display, and Storage.Fig. 1 Reach-In Food Storage Cabinet FeaturesFig. 1 Reach-In Food Storage Cabinet FeaturesFig. 2 Pass-Through Styles Facilitate Some Handling Situa-tionsFig. 2
13、 Pass-Through (Reach-Through) Refrigerator16.2 2010 ASHRAE HandbookRefrigerationsized/shaped receptacles are used to serve a specific system need,such as the following: Food handling for schools, hospitals, cafeterias, and other institu-tional facilitiesMeal manufacturingBakery processingPharmaceuti
14、cal productsBody parts preservation (e.g., blood)The roll-in differs from the reach-in in the following ways:The inside floor is at about the same level as the surrounding roomfloor, so wheeled racks of product can be rolled directly from thesurrounding room into the cabinet interior.Cabinet doors a
15、re full height, with drag gaskets at the bottom.Cabinet interiors have no shelves or other similar accessories.Product TemperaturesRefrigerators are available for medium- or low-temperatureranges. The medium-temperature range has a maximum of 41F anda minimum of 33F core product temperature, with th
16、e most desir-able average temperature close to 38F. Low-temperature refriger-ators cover a range of core product temperatures between 10 and+10F. The desirable average core product temperature is 0F forfrozen foods and 5F for ice cream. Both temperature ranges areavailable in cabinets of many sizes,
17、 and some cabinets combine bothranges.Typical ConstructionRefrigerators are available in two basic types of construction.The older style is a wood frame substructure clad with a metal inte-rior and exterior. The newer style is a welded assembly of exteriorpanels with insulation and liner inserts.Ext
18、erior. Materials used on exteriors (and interiors) are stainlesssteel, painted steel, aluminum-coated steel, aluminum, and vinyl-clad steel with wood grain or other patterns. The requirements arefor a material that (1) matches or blends with that used on nearbyequipment; (2) is easy to keep clean; (
19、3) is not discolored or etchedby common cleaning materials; (4) is strong enough to resist dent-ing, scratching, and abrasion; and (5) provides the necessary framestrength. The material chosen by an individual purchaser depends agreat deal on layout and budget.Interior. Shelves, usually three or fou
20、r per full-height section,are standard interior accessories. Generally, various types of shelfstandards are used to provide vertical shelf adjustment.Racks for roll-in cabinets are generally fitted with slides to handle18 by 26 in. pans, although some newer systems call for either 12 by20 in. or 12
21、by 18 in. steam table pans. Racks designed for specialapplications are available but usually custom designed.Manufacturers and contractors offer various methods of floorinsulation. This is important if the roll-in holds frozen food.Specialty ApplicationsReach-in and roll-in cabinets are regularly mo
22、dified and adaptedto fit the needs of many specialty applications. Variations from stan-dard construction practices are needed to meet the different temper-ature, humidity, product volume, cleanliness, and other specificationsof various refrigeration applications.Food Service. These applications oft
23、en require extra shelves ortray slides, pan slides, or other interior accessories to increase food-holding capacity or make operation more efficient. Because certainstored foods create a corrosive atmosphere in the enclosure, theevaporator coil may have special coatings or fin materials to pre-vent
24、oxidation. As use of foods prepared off-premises increases,on-site storage cabinets are becoming more specialized; there isgrowing pressure for designs that consider new food shapes, aswell as in-and-out handling and storage.Beverage Service. If reach-ins are required, standard cabinets, areused, ex
25、cept when glass doors and special interior racks are neededfor chilled product display. These cabinets generally have oversizedrefrigeration systems to allow for product pulldown cooling.Meal Factories. These applications, which include airline orcentral feeding commissaries, require rugged, heavy-d
26、uty equip-ment, often fitted for bulk in-and-out handling.Retail Bakeries. Special requirements of bakeries are the doughretarder refrigerator and the bakery freezer, which allow the baker tospread the work load over the entire week and to offer a greater vari-ety of products. The recommended temper
27、ature for a dough retarderis 36 to 40F. The relative humidity should be in excess of 80% toprevent crusting or other undesirable effects. In the freezer, the tem-perature should be held at 0F. All cabinets or wheeled racks shouldbe equipped with racks to hold 18 by 26 in. bun pans, which arestandard
28、 throughout the baking industry.Retail Stores. Stores use reach-ins for many different nonfooditems. Drugstores often have refrigerators with special drawers forstoring biological compounds. (See the section on Nonfood Instal-lations.)Fig. 3 Open and Enclosed Roll-In RacksFig. 3 Open and Enclosed Ro
29、ll-In RacksFig. 4 Roll-In Cabinet Usually Part of a Food-Handling orOther Special-Purpose SystemFig. 4 Roll-In Cabinet, Usually Part of Food-Handling or Other Special-Purpose SystemFood Service and General Commercial Refrigeration Equipment 16.3Retail Florists. Florists use reach-in refrigerators fo
30、r displayingand storing flowers. Although a few floral refrigerator designs areconsidered conventional in the trade, the majority are custom built.The display refrigerator in the sales area at the front of the shop mayinclude a picture window display front and have one or more displayaccess doors, e
31、ither swinging or sliding. A variety of open refriger-ators may also be used.For the general assortment of flowers in a refrigerator, most re-tail florists have found best results at temperatures from 40 to45F. The refrigeration coil and condensing unit should be se-lected to maintain high relative
32、humidity. Some florists favor agravity cooling coil because the circulating air velocity is low.Others, however, choose forced-air cooling coils, which develop apositive but gentle airflow through the refrigerator. The forced-aircoil has an advantage when in-and-out service is especially heavybecaus
33、e it provides quick temperature recovery during these peakconditions.Nonfood Installations. Various applications use a wide range ofreach-ins, some standard except for accessory or temperature modi-fications and some completely special. Examples include (1) bio-logical and pharmaceutical cabinets; (
34、2) blood bank refrigerators;(3) low- and ultralow-temperature cabinets for bone, tissue, and red-cell storage; and (4) specially shaped refrigerators to hold columnchromatography and other test apparatus.Blood bank refrigerators for whole blood storage are usuallystandard models, ranging in size fro
35、m under 20to 45 ft3, with thefollowing modifications:Temperature is controlled at 37 to 41F.Special shelves and/or racks are sometimes used.A temperature recorder with a 24 h or 7 day chart is furnished.An audible and/or visual alarm system is supplied to warn ofunsafe blood temperature variation.An
36、 additional alarm system may be provided to warn of powerfailure.Biological, laboratory, and mortuary refrigerators involve thesame technology as refrigerators for food preservation. Most bio-logical serums and vaccines require refrigeration for proper pres-ervation and to retain highest potency. In
37、 hospitals and laboratories,refrigerator temperatures should be 34 to 38F. The refrigeratorshould provide low humidity and should not freeze. Storage inmortuary refrigerators is usually short-term, normally 12 to 24 h at34 to 38F. Refrigeration is provided by a standard air- or water-cooled condensi
38、ng unit with a forced-air cooling coil.Items in biological and laboratory refrigerators are kept in spe-cially designed stainless steel drawers sized for convenient storage,labeled for quick and safe identification, and perforated for properair circulation.Mortuary refrigerators are built in various
39、 sizes and arrange-ments, the most common being two- and four-cadaver self-containedmodels. The two-cadaver cabinet has two individual storage com-partments, one above the other. The condensing unit compartment isabove and indented into the upper front of the cabinet; also, ventila-tion grills are o
40、n the front and top of this section. The four-cadavercabinet is equivalent to two two-cadaver cabinets set together; thestorage compartments are two cabinets wide by two cabinets high,with the compressor compartment above. Six- and eight-cadavercabinets are built along the same lines. The two-cadave
41、r refrigeratoris approximately 38 in. wide by 94 in. deep by 77 in. high and isshipped completely assembled.Each compartment contains a mortuary rack consisting of a car-riage supporting a stainless steel tray. The carriage is telescoping,equipped with roller bearings so that it slides out through t
42、he dooropening, and is self-supporting even when extended. The tray isremovable. Some specifications call for a thermometer to bemounted on the exterior front of the cabinet to show the insidetemperature.Refrigeration SystemsReach-in cabinets can be supported by either remote or self-contained refri
43、geration systems. The following two types of sys-tems apply to all types of refrigeration equipment.Self-contained systems, in which the condensing unit and con-trols are built into the refrigerator structure, are usually air-cooledand are of two general types. The first type has the condensing unit
44、beneath the cabinet; in some designs it takes up the entire lower partof the refrigerator, whereas in others it occupies only a corner at onelower end. The second type has the condensing unit on top.Remote refrigeration systems are often used if cabinets are in-stalled in a hot or otherwise unfavora
45、ble location where noise orheat of the condensing units would be objectionable. Other specialcircumstances may also make remote refrigeration desirable.There are tradeoffs associated with locating a self-contained con-densing unit beneath the refrigerator; although air near the floor is gen-erally c
46、ooler, and thus beneficial to the condensing unit, it is usuallydirtier. Putting the condensing unit on top of the cabinet allows full useof cabinet space, and, although air passing over the condenser may bewarmer, it is cleaner and less obstructed. Having the condensing unitand evaporator coil in t
47、he same location provides a refrigeration unitthat can be removed, serviced, and replaced in the field as a whole. Ser-vicing can then be done at an off-site repair facility.FOOD FREEZERSSome hospitals, schools, commissaries, and other mass-feedingoperations use on-premises freezing to level work lo
48、ads and operatekitchens efficiently on normal schedules. Industrial freezing equip-ment is usually too large for these applications, so operators useeither regular frozen food storage cabinets for limited amounts offreezing or special reach-ins that are designed and refrigerated tooperate as batch-t
49、ype blast freezers.Chapter 29 covers industrial freezing of food products.BLAST CHILLERS AND BLAST FREEZERSThese units are designed to rapidly chill or freeze food immedi-ately after it has been cooked. Blast chillers and freezers are used byfood-service establishments, such as restaurants, hotels, and cafete-rias, that cook large quantities of food items, chill or freeze them,and later reheat portions to be served. Blast chillers are designed toallow operators to comply with food preparation, handling, andstorage guidelines on preventing the growth of dangerous bacteria.These
