VAV-AHU Variable Static Pressure Control And …

1 2007 Matrix Controls Pte Ltd VAV-AHU Variable Static Pressure Control And Constant Static Pressure Control Comparison Test Report Version VAV-AHU Variable Static Pressure Test Report Version Matrix Controls Pte Ltd i Revision History Version Description Prepared by Date Version Create this report base on 4 weeks testing data Fan Jinsong 17 Nov. 2007 VAV-AHU Variable Static Pressure Test Report Version Matrix Controls Pte Ltd ii Contents 1 1 2 TESTING DATA AND TREND GRAPHIC.

2 2 Supply Air Fan Power Consumption 2 AHU Trend Graphic Summary .. 3 VAV Boxes Trend Graphic .. 5 3 CONCLUSIONS .. 9 4 REFERENCE:.. 10 AHU Trend Graphic .. 10 Constant Static Pressure 10 Variable Static Pressure 25 Ambient Air Temperature Trend Graphic .. 37 Tables Table 1 Testing 1 Table 2 AHU-3-2-2 Supply Air Fan Power Consumption 2 Table 3 Summary of AHU Trend Graphic .. 3 Table 4 Summary of AHU Trend Graphic (Cont') .. 4 Table 5 VAV-3-2-2-1 ~7 Space Temperature Trend Graphic .. 5 Table 6 VAV-3-2-2-1 ~7 Space Temperature Trend Graphic (Cont ) .. 6 Table 7 VAV-3-2-2-8 ~10 Space Temperature Trend Graphic .. 7 Table 8 VAV-3-2-2-8 ~10 Space Temperature Trend Graphic (Cont ) .. 8 Table 9 Ambient Air Temperature Trend.

3 37 Table 10 Ambient Air Temperature Trend (Cont') .. 38 VAV-AHU Variable Static Pressure Test Report Version Matrix Controls Pte Ltd 1 1 Description In VAV-AHU system the most energy efficiency Control logic for supply air fan speed Control is Variable Static Pressure Control strategy that modulates fan speed to fulfill total airflow demand from all serving VAV terminal boxes. This comparison testing report shows how much fan power energy can be saved comparing with traditional constant Static Pressure Control . Table 1 Testing AHU AHU AHU-3-2-2 Location 2nd floor of Li Ka Shing Library in Singapore Management University (SMU) Controller Matrix Controls LonWorks Variable Pressure Regulator DDC UVP0000L Communication Network LonWorks Network.

4 Terminal Quantity 10 VAV boxes AHU Configuration Static Pressure set point: 150 Pascal Supply Air Temperature Set point: 14 C Constant Static Pressure Control : 17 Oct. 2007 ~ 31 Oct. 2007, 15 days Testing Date Variable Static Pressure Control : 2 Nov. 2007 ~ 13 Nov. 2007, 12 days Testing location is shown in picture below. Red block is the location of testing AHU-3-2-2, and blue dots are the location of 10 VAV boxes severed by AHU-3-2-2. This area is at north side of building. In sunny afternoon, sunlight will shine in this area through windows. Cooling demand will be significantly changes with time throughout the day, and differes day-by-day. VAV-AHU Variable Static Pressure Test Report Version Matrix Controls Pte Ltd 2 2 Testing Data and Trend Graphic Supply Air Fan Power Consumption Comparison Table 2 AHU-3-2-2 Supply Air Fan Power Consumption Comparison S/N Date Start Time End Time Running Hours Daily Consumption (KWH) Total Consumption (KWH) Hourly Average (KWH) Daily Average (KWH) Daily Saving (%) Hourly Saving (%) Constant Static Pressure Control (Ps= 150 pa)

5 1 17-Oct-2007 7:30 0:00 28 2 18-Oct-2007 7:30 0:00 31 3 19-Oct-2007 7:30 0:00 28 4 20-Oct-2007 8:30 17:00 18 5 21-Oct-2007 13:00 21:00 30 6 22-Oct-2007 6:30 0:00 37 7 23-Oct-2007 6:30 0:00 33 8 24-Oct-2007 6:30 0:00 30 9 25-Oct-2007 6:30 0:00 31 10 26-Oct-2007 6:30 0:00 34 11 27-Oct-2007 7:30 17:00 20 12 28-Oct-2007 13:00 21:00 26 13 29-Oct-2007 6:30 0:00 33 14 30-Oct-2007 6:30 0:00 30 15 31-Oct-2007 6:30 0:00 28 437 Variable Static Pressure Control 1 2-Nov-2007 7:30 0:00 17 2 3-Nov-2007 7.

6 30 17:00 11 3 4-Nov-2007 13:00 21:00 18 4 5-Nov-2007 6:30 0:00 25 5 6-Nov-2007 6:30 0:00 20 6 7-Nov-2007 6:30 0:00 21 7 8-Nov-2007 6:30 0:00 10 8 9-Nov-2007 6:30 0:00 16 9 10-Nov-2007 7:30 17:00 9 10 11-Nov-2007 13:00 21:00 14 11 12-Nov-2007 6:30 0:00 19 12 13-Nov-2007 0:00 0:00 19 180 617 VAV-AHU Variable Static Pressure Test Report Version Matrix Controls Pte Ltd 3 AHU Trend Graphic Summary Refer to reference section to see detail trend graphic.

7 Table 3 Summary of AHU Trend Graphic (Red: Static Pressure , Blue: Fan VSD Output, Brown: Power Rate) 22 Oct. 2007 29 Oct 2007 5 Nov 2007 12 Nov 2007 23 Oct 2007 30 Oct 2007 6 Nov 2007 13 Nov 2007 17 Oct 2007 24 Oct 2007 31 Oct. 2007 7 Nov 2007 VAV-AHU Variable Static Pressure Test Report Version Matrix Controls Pte Ltd 4 Table 4 Summary of AHU Trend Graphic (Cont') (Red: Static Pressure , Blue: Fan VSD Output, Brown: Power Rate) 18 Oct 2007 25 Oct 2007 8 Nov 2007 19 Oct 2007 26 Oct 2007 2 Nov 2007 9 Nov 2007 20 Oct 2007 27 Oct 2007 3 Nov 2007 10 Nov 2007 21 Oct 2007 28 Oct 2007 4 Nov 2007 11 Nov 2007 VAV-AHU Variable Static Pressure Test Report Version Matrix Controls Pte Ltd 5 VAV Boxes Trend Graphic Table 5 VAV-3-2-2-1 ~7 Space Temperature Trend Graphic 22 Oct.

8 2007 29 Oct 2007 5 Nov 2007 12 Nov 2007 23 Oct 2007 30 Oct 2007 6 Nov 2007 13 Nov 2007 17 Oct 2007 24 Oct 2007 31 Oct. 2007 7 Nov 2007 VAV-AHU Variable Static Pressure Test Report Version Matrix Controls Pte Ltd 6 Table 6 VAV-3-2-2-1 ~7 Space Temperature Trend Graphic (Cont ) 18 Oct 2007 25 Oct 2007 8 Nov 2007 19 Oct 2007 26 Oct 2007 2 Nov 2007 9 Nov 2007 20 Oct 2007 27 Oct 2007 3 Nov 2007 10 Nov 2007 21 Oct 2007 28 Oct 2007 4 Nov 2007 11 Nov 2007 VAV-AHU Variable Static Pressure Test Report Version Matrix Controls Pte Ltd 7 Table 7 VAV-3-2-2-8 ~10 Space Temperature Trend Graphic 22 Oct.

9 2007 29 Oct 2007 5 Nov 2007 12 Nov 2007 23 Oct 2007 30 Oct 2007 6 Nov 2007 13 Nov 2007 17 Oct 2007 24 Oct 2007 31 Oct. 2007 7 Nov 2007 VAV-AHU Variable Static Pressure Test Report Version Matrix Controls Pte Ltd 8 Table 8 VAV-3-2-2-8 ~10 Space Temperature Trend Graphic (Cont ) 18 Oct 2007 25 Oct 2007 8 Nov 2007 19 Oct 2007 26 Oct 2007 2 Nov 2007 9 Nov 2007 20 Oct 2007 27 Oct 2007 3 Nov 2007 10 Nov 2007 21 Oct 2007 28 Oct 2007 4 Nov 2007 11 Nov 2007 VAV-AHU Variable Static Pressure Test Report Version Matrix Controls Pte Ltd 93 Conclusions 1)

10 Variable Static Pressure Control can use least supply air fan energy to satisfy air-con space heat demand. 2) It saves 48% fan energy to use Variable Static Pressure Control compare with using constant Static Pressure Control . Constant Static Pressure Control wastes much energy maintaining Static Pressure . 3) Most energy consumption period is at first 2 to 3 hours after AHU operating. During this period system, energy is used mainly to remove the heat accumulated during AHU non-operation period. Rest of time, the energy is used to balance dynamic cooling demand. On 12 and 13 Nov 2007, the AHU operated continuously. Even if it operated 24 hours on 13 November the fan power consumption is still same as previous day on 12 Nov that only operated hours.