Southern California Gas Company Customer Programs Department

Transcription

1 Appliance Test Report SCGAT090211A Middleby Marshall PS-X40 Full-Size Gas Conveyor Oven Performance Test Revision 0 Southern California Gas Company Customer Programs Department Issued Date: March Southern California Gas Company. All trademarks belong to their respective owners. All rights reserved.

2 Disclaimer "The information and analysis contained in this report is based on data collected at the Energy Resource Center. The Gas Company has made reasonable efforts to ensure that all information is correct; however, the Gas Company makes no representation or warranty, express or implied, as to the accuracy, correctness or usefulness of any data or information in this report. Nothing contained in this report is intended to constitute a recommendation, endorsement, approval or guaranty of any product or service. The Gas Company shall not be responsible for errors or omissions in this report or for claims or damages relating to the use of this report, even if it has been advised of the possibility of such damages. All trademarks, methods, processes or other intellectual property contained in or described in this report are the property of their respective owners and the Gas Company makes no representation or warranty that their use will not infringe privately owned rights." Legal Notice This report was prepared as a result of work sponsored by the California Public Utilities Commission (Commission). It does not necessarily represent the views of the Commission, its employees, or the State of California. The Commission, the State of California, its employees, contractors, and subcontractors make no warranty, express or implied, or assume no legal liability for the information in this report; nor does any party represent that the use of this information will not infringe upon privately owned rights. This report has not been approved or disapproved by the Commission nor has the Commission passed upon the accuracy of the information in this report."

3 Revision History Revision Date Description Author No. 0 March 9, 2009 Initial Release Ricardo Vargas

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5 Executive Summary The Middleby Marshall Model PS-840, PS-740, or PS-640 (from here on referred to as PS-X40) gas-fired conveyor oven (Figure.1) was re-evaluated for energy performance at the Southern California Gas Company s Commercial Food Service Equipment Testing Laboratory. Southern California Gas Company (SCG) tested the gas conveyor oven according to the specifications of the American Society for Testing and Materials Figure 1 (ASTM) standard test method F (2003). To be Middleby Marshall PS-Series considered energy efficient a conveyor oven must achieve at least 42% efficiency in the heavy-load cooking-energy efficiency test and have an Idle Energy Rate less than or equal to 57,000 Btu/h. The Middleby Marshall Model PS-X40 oven did not pass the standards as set forth. The test results for the Middleby Marshall Model PS-X40 are as follows: Table ES-1. Summary of ASTM Conveyor Oven Performance Results Heavy-load cooking-energy Efficiency (%) 38.2 Idle Energy Rate (Btu/h) 49,029 Manufacturer rated Energy Input Rate (Btu/h) 99,000 Measured Energy Input Rate (Btu/h) 101,986 Preheat Time room temperature to 465 F (min) 13.7 Preheat Energy room temperature to 465 F (Btu) 24,744 Pilot Energy Rate (Btu/h) N/A Based on the nominal conveyor width and cavity length, the heavy-load cooking energy efficiency test required a total of thirty-six (36) 12-inch diameter tomato and cheese pizzas for a heavy-load energy efficiency test. As specified by the ASTM test method, Cooking-Energy Efficiency is a measure of how much energy an appliance consumes is actually delivered to the food product during the cooking process. Cooking-energy efficiency is defined by: Cooking Energy Efficiency = Energy to Food Energy to Appliance - SCGAT090211A i

6 Mission Statement- Commercial Foodservice Equipment Testing Program Recent advances in equipment design have produced commercial foodservice equipment that operates more efficiently, quickly, safely and conveniently. Energy efficient commercial equipment reduces energy consumption primarily through advanced technology and design. The purpose of Southern California Gas Company s Energy Efficiency Commercial Foodservice Equipment Testing Program is to provide energy efficiency measurement data for cost effectiveness modeling in order to establish energy efficiency standards and ratings for commercial food service equipment. This measurement data is then utilized and integrated with typical equipment usage profiles for California Utility Customers participating in the Food Service Equipment Rebate program. Equipment performance is determined by applying the American Society for Testing and Materials (ASTM) standard test method for performance. The ASTM standard test method is considered the industry standard for quantifying the efficiency and performance for cooking equipment. - SCGAT090211A ii

7 Table of Contents Executive Summary... i Mission Statement- Commercial Foodservice Equipment Testing Program... ii Table of Contents... iii Scope...1 Appliance and test overview...1 Comments, Deviations and Exceptions...2 Testing equipment inventory...3 Testing Equipment Inventory (continued)...4 Testing Equipment Inventory - Photos...4 Testing Equipment Inventory Photos (continued)...5 RESULTS Summary (11) Appliance Type (11.1) Apparatus (11.2) Thermostat Calibration (10.2) Energy Input Rate (11.4) Preheat Energy and Time (11.5) Preheat Curve (11.5) Idle Energy Rate (11.6) Pilot Energy Rate (11.7) Cooking Energy Efficiency, Cooking Energy Efficiency & Production Capacity (11.8)...10 UNCERTAINTY results for cooking Energy Efficiency...11 UNCERTAINTY results for Production Rate SCGAT090211A iii

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9 Scope The scope of this test is to evaluate the performance of the Middleby Marshall Model PS-X40 gas-fired conveyor oven by using ASTM F (2003) Standard Test Method for The Performance of Conveyor Ovens for the test procedure and evaluation criteria. In order to evaluate the oven s energy performance the following tasks were performed: Verify energy input rate Verify thermostat calibration Determine preheat energy consumption and time Determine idle energy rate Determine pilot energy consumption 1 Determine cooking energy efficiency Determine cooking energy rate & production capacity Report findings Appliance and test overview The Middleby Marshall Model PS-X40 is a single deck, natural gas-fired, conveyor oven equipped with a burner rated at 99,000 Btu/h. The oven s rated electric power requirements are 208 Volts AC single phase A. The inner oven cavity measured 34.0 inches width and 40.5 inches depth for a total cooking area of 1,377 square inches and a maximum food cooking height (pass through) of 3.0 inches. The oven is equipped with a conveyor belt that is 72 inches long and 32 inches wide, and controls for conveyor speed and temperature adjustment. The test required pizzas with a 12-inch diameter crust topped with a tomato based pizza sauce and low moisture mozzarella cheese. The testing consisted in taking the pizzas with an initial temperature of 39 ± 1 F and cooking them until the temperature at the sauce-crust interface directly beneath the cheese reached 195 ± 3 F after the pizzas exited the oven cavity. The final 1 Not performed TEST REPORT Page 1 of 12

10 pizza temperature was determined using a structure instrumented with six (6) thermocouple probes. Weight measurements were taken before and after cooking to determine moisture loss. The results from the production capacity of the three (3) test iterations exhibited an average percent uncertainty above 10%. An additional test iteration was performed and yielded a percent error of less than 10% for both the cooking energy efficiency and production capacity results. During the test the gas volume, pressure and temperature were monitored and recorded as well as the ambient air temperature and pressure. Type K thermocouples were used to monitor and record the inside cavity temperature of the oven as well as the ambient air temperature. Electrical power measurements were also monitored and recorded. A Logic Beach data logger was used to monitor and record all data. See Section Testing Equipment Inventory for more detail regarding the testing equipment. Comments, Deviations and Exceptions Comments: This oven was originally tested on May The manufacturer requested a retest of this oven due to updated duct fingers which gave the opportunity to provide improved energy efficiency. The higher heating values for each test were obtained from the SCG s Measurement Collection System (MCS) Gas Analysis daily reports. Energy efficiency calculations are based on half of the total number of pizzas cooked during the Heavy load test, per ASTM F section The oven temperature was taken at the geometric center of cooking cavity two (2) inches above the conveyor belt. The oven s cavity inlet and outlet openings for the conveyor belt were both set to 1.5 inches. Deviations: Testing deviated from the ASTM test method by using a revised loading pattern and increasing the amount of pizzas per iteration from 12 to 18 pizzas. Light Load cooking iterations were not performed. Exceptions: The Middleby Marshall Model PS-X40 conveyor oven came equipped with an electronic pilotless ignition system, no pilot energy data was collected. TEST REPORT Page 2 of 12

11 Testing equipment inventory Energy efficiency testing is conducted at SCG s Commercial Food Service Equipment Food Testing Laboratory located at the Energy Resource Center (ERC) in Downey California. The laboratory can provide utility services such as natural gas, water, electricity, sewer and fume exhaust for a variety of tests. Testing equipment is mounted onto a mobile test bench providing the flexibility of movement within the test lab or for field use. The mobile test bench holds a data logger, various pressure and energy transducers. The data logger provides up to 24 channels with 13 bit analog to digital conversion, and sampling rates of up to 150 samples per second. The bench mounted barometric pressure transducer monitors ambient lab pressure and a differential pressure transducer monitors the natural gas pressure at the gas meter. The electrical transducers are capable of measuring different voltage and phase setups. An analog gas meter fitted with an encoder is used to measure gas consumption. See Tables TEI 1-1, 1-2 for inventory and specifications on testing equipment. Table TEI 1-1. Testing Equipment Inventory Description Manufacturer Model Quantity Data Logger Logic Beach HLP-10 1 Barometric Pressure Transducer Omega EWS-BP-A 1 Differential Pressure Transducer Dwyer Thermocouple Omega Type K 3 Thermocouple probe Omega Type K 6 Gas Meter American Meter DTM 200A 1 Energy Transducer Veris - Hawkeye Table TEI 1-2. Testing Equipment Specifications Description Measures Signal output Measurement range Data Logger Data input Data Varies Barometric Pressure Transducer Pressure 4-20mA psia Differential Pressure Transducer Pressure 4-20mA 0 25 in.-h 2 O. Thermocouple Degree Fahrenheit ± 2 Volts F Gas Meter Cubic feet On / Off pulse 0 or 1 VDC Energy Transducer Current, Voltage Amps, Voltage 100 A (max) VAC TEST REPORT Page 3 of 12

12 Testing Equipment Inventory (continued) The mobile testing bench is equipped with additional testing equipment. The additional testing equipment is listed as miscellaneous testing equipment in Table TEI 2-1. Table TEI 2-1 Miscellaneous Testing Equipment Description Make Model Function Power supply Omega U24y101 Converts 120VAC to 24VDC at 1 Amp max Power supply Idec PS5R Converts 120VAC to 24VDC at 0.3 Amp max Digital multimeter Fluke 189 Measures Voltage, resistance, current & temperature Digital manometer Testo 512 Measures gauge pressure (0 29 psig, 0.5% of fsv) Pressure gauge Ashcroft - Measures gauge pressure (0 15 psig) Testing Equipment Inventory - Photos Data Logger Barometric Pressure Transducer Power Supplies Differential Pressure Transducer Figure 2 Testing equipment on mobile cart TEST REPORT Page 4 of 12

13 Testing Equipment Inventory Photos (continued) Energy transducer Figure 3 Six probe temperature assembly Figure 4 Fuse box and energy transducers Pressure gauge Figure 5 Gas meter and pressure gauge Figure 6 Gas meter & mobile testing cart TEST REPORT Page 5 of 12

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15 Performance of Conveyor Ovens RESULTS SUMMARY (11) ASTM F (2003) Manufacturer Model Date Test Reference Number Middleby Marshall Wow PS-840,740,640 March 9, 2009 SCGAT090211A 1. Appliance Type - Conveyor Oven (11.1) Fuel type: Oven Btu/h rating Natural gas 99,000 Btu/h Physical dimensions Size of Oven: Nominal conveyor width: Nominal conveyor length: 41.5 H x 57.0 W x 77.0 L inches 2 feet 6 feet Inner cavity dimension 3.0 H x 34.0 W x 40.5 L inches Controls: The controls for operating the oven, setting temperature and conveyor belt speed are accessed and monitored through a flat panel color touch screen located on right side of the oven. The touch panel also serves as maintenance and service access to the ovens diagnostic features and special settings menu which are password protected to the end user. Description of operational characteristics: With the oven s thermostat set point at 475ºF, the average temperature at the center of the oven was determined to be 476ºF within the ± 5ºF tolerance set forth in the ASTM F (2003) test method section Apparatus (11.2) Check if testing apparatus conformed to specifications in Section 6. RESULTS SUMMARY Performance of Conveyor Ovens Page 7 of 12

16 3. Thermostat Calibration (10.2) As-Received: Oven temperature control setting ( F) 475 Oven cavity temperature ( F) 476 Oven temperature control setting ( F) N/A Oven cavity temperature ( F) N/A As-Adjusted: Oven temperature control setting ( F) Oven cavity temperature ( F) Oven temperature control setting ( F) Oven cavity temperature ( F) N/A N/A N/A N/A 4. Energy Input Rate (11.4) Test Voltage (V) Higher heating value of natural gas (Btu/ft 3 ) 1,020 Rated (by manufacturer) (Btu/h) 99,000 Measured (Btu/h) 101,986 Percent Difference between Measured & Rated (%): 3.0 Fan / Control Energy Rate (kw) Preheat Energy and Time (11.5) Test Voltage (V) Higher heating value of natural gas (Btu/ft 3 ) 1,024 Total Energy consumption (Btu) 24,744 Starting temperature of oven cavity ( F) 71 Duration from RT to 465 F (minutes) 13.7 RESULTS SUMMARY Performance of Conveyor Ovens Page 8 of 12

17 5. Preheat Curve (11.5) Preheat Curve Middleby Marshall PS-X Temperature (ºF) Time (min) 6. Idle Energy Rate (11.6) Test Voltage (V) Higher heating value of natural gas (Btu/ft 3 ) 1,029 Idle energy rate at 475 F (Btu/h) 49, Pilot Energy Rate (11.7) Higher heating value of natural gas (Btu/ft 3 ) Pilot energy rate (Btu/h) See Comments, Deviations and Exceptions N/A N/A RESULTS SUMMARY Performance of Conveyor Ovens Page 9 of 12

18 8. Cooking Energy Efficiency, Cooking Energy Efficiency & Production Capacity (11.8) Cook Time Determination Cook time (minutes) 5.5 Conveyor setting (minutes, seconds) 3,00 Light-Load (For information only): Test voltage (V) Gas heating value (Btu/ft 3 ) Cooking Energy Efficiency (%) Cooking Energy Rate (Btu/h) Electric Energy Rate (kw) Production Capacity (lb/h) See Comments, Deviations and Exceptions Heavy-Load: Test voltage (V) Gas heating value (Btu/ft 3 ) 1,014 Cooking Energy Efficiency (%) 38.2 Cooking Energy Rate (Btu/h) 104,472 Electric Energy Rate (kw) 1.28 Production Capacity (lb/h) 289 RESULTS SUMMARY Performance of Conveyor Ovens Page 10 of 12

19 Performance of Conveyor Ovens UNCERTAINTY RESULTS FOR COOKING ENERGY EFFICIENCY Annex A1 Make: Middleby Marshall Model: Wow PS-840,740,640 Equipment Type: gas conveyor oven Calculations from: ASTM F (2003) Annex A1 Results Evaluated: Cooking Energy Efficiency (%) A. Iteration results 1. Iteration 1 X 1 = Iteration 2 X 2 = Iteration 3 X 3 = Iteration 4 X 4 = Iteration 5 X 5 = B. Uncertainty results Average Standard deviation Absolute Uncertainty % Uncertainty Xa n = 38.2 S n = 1.22 U n = 1.94 %U n = 5.1 UNCERTAINTY RESULTS Performance of Conveyor Ovens Page 11 of 12

20 Performance of Conveyor Ovens UNCERTAINTY RESULTS FOR PRODUCTION RATE Annex A1 Make: Model: Equipment Type: Calculations from: Results Evaluated: Middleby Marshall Wow PS-840,740,640 gas conveyor oven ASTM F (2003) Annex A1 Production Rate (lb/h) C. Iteration results 1. Iteration 1 X 1 = Iteration 2 X 2 = Iteration 3 X 3 = Iteration 4 X 4 = Iteration 5 X 5 = D. Uncertainty results Average Standard deviation Absolute Uncertainty % Uncertainty Xa n = 289 S n = 14.4 U n = 22.9 %U n = 7.9 Signatures: The undersigned has performed stated tests and has verified that the results recorded were the actual results observed. SCG s Tester: (signature) (date) Ricardo Vargas (print name) UNCERTAINTY RESULTS Performance of Conveyor Ovens Page 12 of 12