scope:

INTRODUCTION

The capture and containment (C&C) exhaust ventilation rates for commercial cooking appliances currently published in the ASHRAE Applications Handbook, Kitchen Ventilation, Chapter 30 (ASHRAE, 2005) were obtained through a consensus of industry representatives, including hood manufacturers, appliance manufacturers, kitchen designers, and foodservice consultants. To support this consensus, the body of research regarding capture and containment to date has been significant. However, many appliance types have not been documented and others need review. The test matrix for the ASHRAE RP-1362 work statement identified 20 additional appliances to be tested with the goal of improving the heat gain information available in Table 5, Recommended Rates of Heat Gain from Typical Commercial Cooking Appliances, in Chapter 31 (ASHRAE, 2008) and provide expanded data for Chapter 30. To compliment the specified appliances, refrigeration equipment was added to the test matrix. The compilation of new capture and containment data, in parallel with new heat gain data, will support the efforts of ASHRAE in providing engineers with better design guidelines for commercial kitchen ventilation systems. The information regarding the heat gain evaluation can be found in the technical paper titled Revised Heat Gain Rates from Typical Commercial Cooking Appliances from RP-1362 (Swierczyna, et al, 2008), as well as in the main project report titled ASHRAE Research Project 1362 Revised Heat Gain and Capture and Containment Exhaust Rates from Typical Commercial Cooking Appliances (Swierczyna, et al, 2008).

The capture and containment performance of the hooded equipment was characterized by the threshold capture and containment exhaust airflow rate as determined in accordance with ASTM F1704-05 Standard Test Method for Capture and Containment Performance of Commercial Kitchen Exhaust Ventilation Systems (ASTM, 2005). The capture and containment conditions were established for full-load cooking conditions using two full-scale schlieren systems and one shadowgraph system that allow visualization of the thermal and cooking plumes in real time (Schmid, et al, 1997). Heavyload cooking or simulation was conducted in accordance with the appropriate ASTM performance test methods or as otherwise recommended and endorsed by the project monitoring sub-committee (PMS) (ASTM, 2008).

In this paper, exhaust capture and containment rates are discussed. First, the data is summarized across all appliance duty classes. Then, the impact of side panels on capture and containment performance is presented. Next, a more detailed review of the capture and containment results are presented by duty class, including the extra-heavy, heavy, medium, and light duty classes, as well as typically unhooded equipment that could operate as hooded equipment. Lastly, capture and containment exhaust rates that greatly differed from the rates established for the duty class are highlighted, along with potential duty class reclassification.