UC Los Angeles Campus & Medical Center Strategic Energy Plan ...

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8.8.5 UCLA Custom Project 5. Install VFDs on Cooling Towers This project considers installing Variable Frequency drives (VFD) on Cooling Tower Fan. With VFD, fan speed is regulated to meet the required cooling needs. Since cooling tower is designed based on outside air wet bulb temperature, variation in wet bulb temperature affects tower performance. Highest wet bulb temperature for a particular location occurs only few hours per year; and it is not required to run tower fan at design speed (100%) for remaining hours. Fan speed can be reduced to meet cooling needs and therefore allowing significant electric energy and demand savings. VFD allows soft start and reduces wear and tear of fan belts, bearings. The power requirement of cooling tower fan varies as a cube of its speed. The VFD allows the cooling tower fan to operate at whatever speed is required to meet the cooing needs. Typically the fan runs at only 40 - 70% of design speed, thus saving 50% or more of the energy consumed by fixed speed system. Every time the actual wet bulb temperature is lower than the design wet bulb, an energy saving potential exists. Changes in the ambient wet bulb temperatures allow the fan speed to be regulated. Running fan at lower speed reduces energy consumed by the fan’s motor. The magnitude of this saving potential depends upon wet bulb temperature fluctuations. In addition to fan energy savings, running fan at lower speed reduces evaporation rate of treated water. 8.8.6 UCLA Custom Project 6. Variable Speed Drives on Pumps This project considers installing Variable Frequency drives (VFD) on HVAC centrifugal pumps to vary pump speed by varying electrical frequency input to pump motor in relation to system heating and cooling load. This project focuses on pumps which run at fixed speed and do not alter flow of water in accordance with the HVAC system load requirements. In other words these pumps run at design speed (100%) independent of system characteristics wasting pumping energy and imposing electric demand charges on the campus. Generally pumps are designed to run at rated speed to meet the peak HVAC system demand which occurs only few hours per year. Rest of the time, due to the diversity in the system, the system does not require pump to deliver design flow (since the peak for each zone does not occur at the same time). Therefore system requires less flow than the design flow providing an opportunity to save pump energy by reducing pump speed to meet reduced system flow requirements. Speed reduction results in a more significant energy reduction. The larger the flow reduction from the designed operating point, the larger the energy savings. Since flow rate is directly proportional to pump speed and the differential pressure is directly proportional to the square of the pump speed, power usage is directly proportional to the cube of the pump speed. For example, reducing speed by 50% requires only 12.5% of the power needed at full speed. The project involves installing Variable Speed Drives on pumps and differential pressure transmitter in HVAC loop to control and monitor pump speed. Pump VFD and differential pressure transmitter will be connected to existing building energy management system. Also existing bypass valves in loop will be disabled for successful implementation of this ECM. This ECM assumes that existing pump motors are inverter duty type. 2413.01/Reports/UC SEP Final Report – UCLA.doc 8-20 December 31, 2008 Newcomb | Anderson | McCormick
9. BUILDING OVERVIEW & PROJECTS The following pages provide an overview of the recommended projects and summary of information for the associated buildings. The section is organized sequentially according to the Building Key, and each contains the following information for each SEP Building. • Basic information about the building is contained in the header. • Annual historical energy use by utility for the FY 06/07 baseline, whether metered or extrapolated. • Monthly historical energy use by utility, where data is available. • Hourly load profiles by utility for one summer week and one winter week, where data is available. • Currently planned energy projects being implemented as part of the 2006-08 UC/CSU/IOU Partnership cycle, and their associated savings as approved for the incentive application. • Projects identified by the Strategic Energy Plan, and the projected savings and economics. The SEP ID Number is a key reference to find the applicable Project Summary. • Benchmarking information, calculating the baseline and projected energy uses after implementation of currently planned energy projects and after implementation of the projects identified in this SEP. 2413.01/Reports/UC SEP Final Report – UCLA.doc 9-1 December 31, 2008 Newcomb | Anderson | McCormick
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UC STRATEGIC ENERGY PLAN University
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TABLE OF CONTENTS (CONTINUED) 12. E
Page 7 and 8: 1. EXECUTIVE SUMMARY 1.1 Policy on
Page 9 and 10: Table 1.1: Summary of Baseline and
Page 11: The campus has reviewed a prelimina
Page 14 and 15: Construction costs of recommended p
Page 16 and 17: Campus Los Angeles Santa Monica Hos
Page 18 and 19: 2.3 Campus Overview University of C
Page 20 and 21: Table 2.4: SEP Buildings (Continued
Page 23: 3. HISTORICAL CAMPUS ENERGY USE 3.1
Page 26 and 27: 4.2 Individual Building Metering Bu
Page 28 and 29: of UCSD buildings is shown in Figur
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Page 35 and 36: 7. RENEWABLE ENERGY GENERATION 7.1
Page 37 and 38: 8. RECOMMENDED ENERGY EFFICIENCY PR
Page 39 and 40: One campus, UC Santa Barbara, has c
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Page 43 and 44: 8.2.3 Air Handler Project 3. Demand
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Page 51 and 52: The budget that each campus has to
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Strategic Energy Plan Projects SEP
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PROJECT DETAIL REPORT SEP Project I
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City: Los Angeles City Index Materi
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11. PROJECT LISTS & SUMMARY OF PROJ
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Table 11.1: SEP Projects by Funding
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educing growth adjusted electricity
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step within the Strategic Energy Pl
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Appendix A Field Data Forms (Electr
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Appendix C Other Calculations and D
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UC Los Angeles Campus & Medical Center Strategic Energy Plan ...

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