Commercial Kitchen Ventilation- Efficient Exhaust and Heat Recovery

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Commercial Kitchen Ventilation- Efficient Exhaust and Heat Recovery #331-1 CH-89-9-6 Commercial Kitchen Ventilation­ Efficient Exhaust and Heat Recovery D.K. Black ASHRAE Life Member ABSTRACT ciency and, if it malfunctions, can shut down the entire This paper outlines those considerations and kitchen and restaurant. requirements that are pertinent to the design and opera­ The subject of commercial kitchen ventilation covers tion of a properly functioning exhaust system 'for a a number of factors or considerations that combine to form commercial kitchen. It embraces such subjects as air the basis of a system that will perform satisfactorily, be cost quality, energy conservation, air pollution control, sanita­ effective, and comply with applicable codes. tion, and fire safety. Determination of necessary and These factors include smoke capture, grease extrac­ appropriate exhaust air volumes for various items of cobk· tion and disposal, fire protec1ion. and the maintenance of ing equipment is discussed. The potential for heat acceptable air quality and temperature in the kitchen recovery Is detailed, together with a description of the space. Modern systems may also include air pollutioh con­ technology involved. trol and heat recovery equipment. Efficient grease extraction is extremely important. INTRODUCTION Grease that is hOt exhausted will collect in ductwork and The state of the art in commercial kitchen ventilation create a fire hazard. To such areas, the difference between is indeed essentially an art, accepting certain basic funda­ 90% and 95% efficiency is not 5% but rather 100%. mentals of thermodynamics, environmental control, and air Centrifugal ~rease extraction has proved to be highly movement, but responding largely to experience and effective and is currently employed on most leading logic. Certainly, science is very much involved in kitchen designs of exhaust hoods. Many such hoods ate also ventilation; however, it is anything but an exact science. equipped with internal wash systems using hot water with A typical application may involve many variables. some of detergent injection to automatically dispose of the ex­ which may be virtually unknown and/or difficult to estimate. tracted grease. Good judgment is a major factor in kitchen ventilation Fire protection is equally important. There are approx­ engineering and design. imately 27,000 restaurant fires annually in the U.S. and 30% Availability of research data is extremely limited. of those originate in the kitchen. The fire protection system Indeed, most of what is known and accepled today 1s of should be capable bf not only extinguishing a fire on the recent origin and modern tE)c hniques have largely devel­ cooking surface, but also effectively preventing the fire from oped over the past few years. entering the exhaust duct. This paper will endeavor to identify the challenges and potentials as they are seen and explain the responding philosophies and tech~iques to handle them. EFFICIENT EXHAUST There have been numerous standards and codes COMMERCIAL KITCHEN VENTILATION written on desirable exhaust and air change rates. TM Commercial food service, in its many forms, consti­ parameters vary widely and should include some con· tutes one of the largest and most stable industries in the siderat1on of kitchen temperature control. United States. A recent report to the Gas Research Institute The most prominent component of a ki ch en ventila· indicated that there are more than 500,000 food service lion system 1s the exhaust hood. The primary function of t11 e establishments in the US., that they serve 77 million people hood 1s to capture and exhaust smoke. grease vapors. anci per day, and the cooking equipment under their exhaust other contaminants generated by the cooking process hoods consumes more than 200 trillion Btu (211 trillion kJ) The volume of air required to accomplish this mus1 IJ of gas annually. Some 45% of those Btu are wasted in the determined. It is importan that this volume be kept to t11e exhaust air through those hoods. minimum possible since 11 must be replaced by make-up Kitchen ventilation is a vital component of this huge air. whic usually requires heating andtor cooling TtH~ industry; it affects building air balance and energy effi- foll owing are some o! the concef)IS and procedures that D.K. Black, Vice President, Engineering, Gaylord Industries, fnc. , Tualatin . OR. THIS PREPRINT IS FOR D!SCUSSION PURPOSES ONLY. FOR INCLUSION IN ASHRAE TRANSACTIONS 1089 V g - Pt 1 N t t b · d · , · wilhout written e rn· · f th A · S -_ t . ~ .:> • - o o e rcpnnte in w.1 ole or 1n part . c· , P ·'., ,'r55 •on o · e mencan oc1ely o Heating .Refngerahng and Air-Cond11 10n:ng Engineers Inc 1791 Tull1e Circle. NE . Allan: 8. GA 30322. Opinions. finding ..... con.Ju s.,1 .b, or recommendat1ons ~xnre s s e d in This paner are lhosi:: o: ihe aul~or's) an r~ do no! n ·~ Ct.~ssari:, r :f:.;-ct t!-'i·~ viev.':. 81 /-4.SH R/l,C / " I ., COOKING 1000 CFl.4 ) RANGE (472 L/ 5 1000 CFM (472 L/ ) RANGE ONLY, NO HOOD. 5 THERMAL AIR CURRENTS COMING OFF THE COOKING RANGE 1000 CFM(472 L/5) Figure 1 Range only; no hood HOOD BALANCED TO THERMAL AIR CURRENTS have been developed and applied successfully in the real COMING OFF THE COOKING SURFACE. world of commercial kitchens. NET EXHAUST FROM KITCHEN 1000 CFM(472 L/ } To start with. it is not the hood, but rather the cooking 5 equipment, that determines the basic exhaust require­ Figure 2 Hood balanced to thermal currents ment; different types of cooking ~ave different exhaust needs. Certainly the hood design and dimensions are important, but they also are essentially dictated by t11e Equal flow will work under ideal conditions bu leaves cooking equipment. no capture velocity al the lront lip of the hood since all the Exhausting over hot cooking equipment is like han· air is coming lrom the cooking surface and entering the dling most other hot processes; the thermal air currents hood from below. Theoretically, no capture velocity is must at least be matched. Heated surfaces of cooking needed at that point since thermal and exhausi flows are equipment generate thermal air currents. and, iust like any in equilibrium. other heated surlace. the temperature, area. and con· However, in the real world it is necessary to add safety figuration of the surface are major factors in determining factors, as shown in Figure 3, to counteract cross-curre11ts. the extent of those currents. Variable as t11ey may be. tliey turbulence; and surges in thermal currents. These safety establish the minimum exhaust volume. factors are derived from a combination of calculation. Consider a single item of cooking equipment, as experience. and good judgment. They vary according to shown in Figure 1. When heated to operating temperature. application, hood type, and manufacturer. In this case a 11 generates a thermal air trow. such as 1000 cfm (472 Lis) 20% safety factor is applied and thus an increase in the There is no hood 01 fan involved at this time. since a hood exhaust volume to 1200 elm (566.4 Lis) has no control over the thermal currents generated. As The additional 200 elm (94 4 Lis) enters the hood a1 heated air rises from the cooking surface. the resulting low the front lip and thus establishes the "upper level · cap!uro pressure at the surface causes room air to pull in to replace velocity. It does not change the "lower level" capture veloc­ it. Thus. a pattern 1s established Note that air is drawn in ity significantly since nothing has changed at 111e cook111g at the cooking surface level to sustain the cooking process surface. In the event of a tl1ermal surge. the e>:tr,q "Irr !S When an exhaust hood is applied. as shovm rn drawn in at the ··1ower. level" and subtracts lrom :h ~ upoc• Figure 2, the exhaust volume must at least equal the th er level" safely margin. mal air currents being received by the hood. otherwise the it should be pointed out tilat with not equip!·.-w:r:• :11·~· hood will overflow and eject some of the smoke.and heated highest capture velocity will alviays IJe a1 t11e lrn·:er ,c;,1.:;i vapors rnto the kitchen . unless the exhaust volume rs much greater tha r1 ,, neecJs ) 1200 CFM(566.4 L/5 ·:~ .. ¥~':1< 1000 c~ , , ) (472 L/5 ADD A 20% SAFETY FACTOR TO COUNTER 50% COMPENSATING HOOD ) TURBULENCE, CROSS CURRENTS, THERMAL NET EXHAUS.T FROM KITCHEN 1200 CFM{566.4L/5 SURGES, ETC. NET EXHAUST FROM KITCHEN 1200 CFM(S66.4L/5l Figure 4 50% compensating hood Figure 3 Add 20% safety factor HVAC system sees no change in tempered air volume. This would be a 50% short ·circuit hood. to be. This is exactly opposite to operation over cold equip­ As another example, what if 4800 elm (2265.6 Lis) is ment. Some hood designers calculate performance called for. as shown in Figure 5? Simply increase the short requirements under cold conditions and, on paper. arrive circuit lo 3600 cfm (1699.2 Us)_The required 1200 elm at substantial upper-level capture velocities. They tend to (566.4 Lis) is still retained and now it is a 75% hood. ignore thermal air currents and, consequently, end up with The 3600 elm (1699.2 Lis) literally compensates for the a hood that does not operate properly. surplus exhaust and thus the term "compensating hood," Getting back to the example in Figure 3. there is 11ow which is often applied to Ihat design. The 4800 elm (2265.6 a system that should perform adequately at minimum prac­ Us) exhaust permits the 3600 cfm (1699. 2 Us) supply. Con· tical exhaust volume.
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