ASHRAE Journal -November 2012 - 44
Response Time
In addition to evaluating Temperature Constant Constant Constant the exhaust airflow achieved Appliance Temperature + Cooking Temperature, Temperature, Temperature, with different types of DCV Only Curve Activity Sensor SP=90°F SP=100°F SP=130°F systems, the response times of the systems were compared Charbroiler 23 N/A N/A N/A N/A as shown in Table 2. An entry Griddle 35 174 N/A 181 N/A of “N/A” indicates that the Open-Vat Fryer 23 N/A 297 N/A N/A system either was not able to meet or remained at design Table 2: Response time comparison. airflow during the test. Note the response time of the systems with the CAS was substan- for tested appliances. When using only the temperature sensor, tially faster than the temperature-based systems. This is be- system response is more dependent on the correct selection setcause the sensor actively monitors what is occurring at the ap- points and is always delayed. If improperly configured, temperpliance level, and can indicate when cooking occurs as soon as ature-based systems can operate at either idle or design airflow the product is placed in/on the appliance and drive the exhaust at all times, resulting in loss of C&C or no energy savings. fan to design airflow for the entirety of the process; whereas, Each appliance shown has different exhaust temperatures a temperature-based system can only react to a by-product of that represent the transition from idle to cooking states. Rarethe cooking process: a change in temperature that takes longer ly, appliances are configured so that each has a dedicated exto observe. haust hood; the mixed lineup under a long hood is typical. Appliance lineups will vary from site to site, making a generic Discussion temperature curve or setpoint nearly impossible to obtain. The inclusion of the cooking activity sensor ensures the sysSome configurations can perform well without the CAS. tem goes to design airflow at the onset of the cooking process For example, convection or conveyor ovens produce little to
Time From Start of Cooking (Seconds) When Design Airflow Reached
www.info.hotims.com/41645-26
44
ASHRAE Journal
November 2012
ASHRAE Journal -November 2012
Table of Contents for the Digital Edition of ASHRAE Journal -November 2012
ASHRAE Journal -November 2012
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Methods for Effective Room Air Distribution: Part One
Technology Award Case Studies:
TES for Medical Center
Feature Articles
Demand-Controlled Ventilation for Commercial Kitchens
Special Supplement: BACnet® Today and the Smart Grid
Commentary
BACnet for a City
Electric Utilities and the HVAC Industry
OpenADR Advances
Demand Response and Light Control
Standing Columns
Building Sciences
Special Section
InfoCenter
Data Centers
Emerging Technologies
Refrigeration Applications
Engineer's Notebook
Special Products
Washington Report
Products
Classified Advertising
Advertisers Index
ASHRAE Journal -November 2012 - ASHRAE Journal -November 2012
ASHRAE Journal -November 2012 - Cover2
ASHRAE Journal -November 2012 - 1
ASHRAE Journal -November 2012 - 2
ASHRAE Journal -November 2012 - Contents
ASHRAE Journal -November 2012 - Commentary
ASHRAE Journal -November 2012 - 5
ASHRAE Journal -November 2012 - Industry News
ASHRAE Journal -November 2012 - 7
ASHRAE Journal -November 2012 - 8
ASHRAE Journal -November 2012 - 9
ASHRAE Journal -November 2012 - 10
ASHRAE Journal -November 2012 - 11
ASHRAE Journal -November 2012 - Letters
ASHRAE Journal -November 2012 - 13
ASHRAE Journal -November 2012 - Meetings and Shows
ASHRAE Journal -November 2012 - 15
ASHRAE Journal -November 2012 - 16
ASHRAE Journal -November 2012 - 17
ASHRAE Journal -November 2012 - Methods for Effective Room Air Distribution: Part One
ASHRAE Journal -November 2012 - 19
ASHRAE Journal -November 2012 - 20
ASHRAE Journal -November 2012 - 21
ASHRAE Journal -November 2012 - 22
ASHRAE Journal -November 2012 - 23
ASHRAE Journal -November 2012 - 24
ASHRAE Journal -November 2012 - 25
ASHRAE Journal -November 2012 - 26
ASHRAE Journal -November 2012 - 27
ASHRAE Journal -November 2012 - TES for Medical Center
ASHRAE Journal -November 2012 - 29
ASHRAE Journal -November 2012 - 30
ASHRAE Journal -November 2012 - 31
ASHRAE Journal -November 2012 - 32
ASHRAE Journal -November 2012 - 33
ASHRAE Journal -November 2012 - 34
ASHRAE Journal -November 2012 - 35
ASHRAE Journal -November 2012 - Demand-Controlled Ventilation for Commercial Kitchens
ASHRAE Journal -November 2012 - 37
ASHRAE Journal -November 2012 - 38
ASHRAE Journal -November 2012 - 39
ASHRAE Journal -November 2012 - 40
ASHRAE Journal -November 2012 - 41
ASHRAE Journal -November 2012 - 42
ASHRAE Journal -November 2012 - 43
ASHRAE Journal -November 2012 - 44
ASHRAE Journal -November 2012 - 45
ASHRAE Journal -November 2012 - 46
ASHRAE Journal -November 2012 - 47
ASHRAE Journal -November 2012 - 48
ASHRAE Journal -November 2012 - Special Supplement: BACnet® Today and the Smart Grid
ASHRAE Journal -November 2012 - B2
ASHRAE Journal -November 2012 - Commentary
ASHRAE Journal -November 2012 - BACnet for a City
ASHRAE Journal -November 2012 - B5
ASHRAE Journal -November 2012 - B6
ASHRAE Journal -November 2012 - B7
ASHRAE Journal -November 2012 - B8
ASHRAE Journal -November 2012 - B9
ASHRAE Journal -November 2012 - Electric Utilities and the HVAC Industry
ASHRAE Journal -November 2012 - B11
ASHRAE Journal -November 2012 - B12
ASHRAE Journal -November 2012 - B13
ASHRAE Journal -November 2012 - B14
ASHRAE Journal -November 2012 - B15
ASHRAE Journal -November 2012 - OpenADR Advances
ASHRAE Journal -November 2012 - B17
ASHRAE Journal -November 2012 - B18
ASHRAE Journal -November 2012 - B19
ASHRAE Journal -November 2012 - Demand Response and Light Control
ASHRAE Journal -November 2012 - B21
ASHRAE Journal -November 2012 - B22
ASHRAE Journal -November 2012 - B23
ASHRAE Journal -November 2012 - B24
ASHRAE Journal -November 2012 - 49
ASHRAE Journal -November 2012 - Building Sciences
ASHRAE Journal -November 2012 - 51
ASHRAE Journal -November 2012 - 52
ASHRAE Journal -November 2012 - 53
ASHRAE Journal -November 2012 - 54
ASHRAE Journal -November 2012 - 55
ASHRAE Journal -November 2012 - InfoCenter
ASHRAE Journal -November 2012 - 57
ASHRAE Journal -November 2012 - 58
ASHRAE Journal -November 2012 - 59
ASHRAE Journal -November 2012 - 60
ASHRAE Journal -November 2012 - 61
ASHRAE Journal -November 2012 - 62
ASHRAE Journal -November 2012 - 63
ASHRAE Journal -November 2012 - Data Centers
ASHRAE Journal -November 2012 - 65
ASHRAE Journal -November 2012 - 66
ASHRAE Journal -November 2012 - 67
ASHRAE Journal -November 2012 - Emerging Technologies
ASHRAE Journal -November 2012 - 69
ASHRAE Journal -November 2012 - 70
ASHRAE Journal -November 2012 - 71
ASHRAE Journal -November 2012 - Refrigeration Applications
ASHRAE Journal -November 2012 - 73
ASHRAE Journal -November 2012 - Engineer's Notebook
ASHRAE Journal -November 2012 - 75
ASHRAE Journal -November 2012 - Special Products
ASHRAE Journal -November 2012 - Washington Report
ASHRAE Journal -November 2012 - Products
ASHRAE Journal -November 2012 - Classified Advertising
ASHRAE Journal -November 2012 - Advertisers Index
ASHRAE Journal -November 2012 - Cover3
ASHRAE Journal -November 2012 - Cover4
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