Presentation on theme: "Alabama Water Resources Conference 2013"— Presentation transcript:
1 Alabama Water Resources Conference 2013 Case Study of Condensate Recovery and Its Reuse at The University of Alabama at BirminghamPresented byAtul KajaleDr. Robert W. Peters, Ph.D., P.E.Mr. Matt WinslettAlabama Water Resources Conference 2013Orange Beach, ALSeptember 5-6, 2013
2 Overview Introduction Condensate recovery Chilled water usage Results Discussion and Conclusions
3 IntroductionCondensate Recovery: Recovery of the condensate water produced from the air handling units (AHUs) and its reuse in processes where non-potable water is required.Condensate Recovery Systems (CRS) in new constructions and in existing buildings.Uses of condensate water- for irrigation, flushing toilets, reuse in chilled water plantsSoutheastern states have potential of capturing more than 15 gallons per cfm of air [Lawrence and Perry, 2010].
4 IntroductionResearch done in co-operation with the Energy Management Division of the Facilities Management Department at the University of Alabama at Birmingham (UAB)CRSs in seven campus buildingsLaboratories, and research buildings use- 100% outside airPipes, joints/connectors, water storage tanks ( gallons), pumps, floating devices, filters, and water - meters.
5 Condensate RecoveryFigure 1. Condensate Collection Potential in United States. [Lawrence and Perry, (2010)]
7 Condensate Recovery at UAB Figure 2. Schematic of the Condensate Collection System at UAB.
8 Condensate Recovery at UAB Figure 3. Condensate Recovery System at UAB: Small storage tank, 500-gallon storage tank
9 Condensate Recovery at UAB Condensate from each 500-gallon storage tanks is measured by a water - meterCondensate production in 4 AHUs is continuously monitored and recorded in real-time using HOBO- U20 water level dataloggersChange in water level, temperature, and pressure.Condensate is fed to the chilled water return pipeTemperature of condensate (53⁰F-73⁰F)
10 Condensate Recovery at UAB Main objectives of the study:Develop a multiple regression model to analyze the effect of indoor and outdoor operating conditions.Model validation, hypothesis testingSensitivity analysis and uncertainty analysisProjection for other campus buildingsFeasibility analysis and applicability for other locations in Alabama.
11 Condensate Recovery at UAB Building NameInstallation CostMcCallum Building$ ,000Kaul Building$ ,000Zeigler Building$ ,500Tinsley Harrison Tower$ ,500Bevill Building$ ,000Resreach Support Building$ ,500Volker Hall Tower$ ,000Wallace Tumor Institute$ ,000Total$ ,000Table 1. Detailed Cost of Condensate Recovery System at UAB
12 Results 3 chilled water plants serve 52 campus buildings. Make-up water demand and costFigure 4. Water demand of UAB Central Chilled Water Plant
13 Results Year Water in gallons 2012 (12 months) 3,232,962 2,128,719Figure 5. Condensate volume recovered at McCallum and Tinsley Harrison Tower
14 ResultsFigure 6. Condensate volume recovered from six condensate recovery systems
15 ResultsIn 2011, total water demand was 311,00 CCF and the cost $2,170,000.In 2012, total water demand was 310,199 CCF and the cost $1,960,075.More than 7 million gallons of water was captured and reused in 2012.5.7 million gallons of condensate is captured in till the end of July.12.7 millions gallons accounts for $54,500.This accounts for 5% of water demand and 2.7% of associated cost
16 ResultsThe peak condensate recovery during summer was 4.38 gph/1000 ft2.Average condensate was is 6 times higher than predicted by Guz’s study (2005).The minimum and maximum hourly condensate volumes ranged from 0 to 230 gph.12.7 millions gallons of condensate recovery accounts for $54,500 of savings.Average payback period of 3 years for the entire project.
17 DiscussionAdvantages of reuse of condensate water in chilled water plants:Lowers the water demand of the chilled water plant.Efficient use of potable water.Temperature of condensate varies between 53 ⁰F and 74 ⁰F whereas the temperature of municipal water is 81 ⁰F.Feasibility: water savings, energy savings, and sewer cost
18 DiscussionMajority of the southeastern United States is prone to drought condition and hence conservation of water is very important.Hot and humid weather is favorable for successful condensate recovery.There is great potential for water conservation in commercial, industrial, and institutional buildings.CRS at UAB have shown significant collection of condensateIndicating opportunity to install more systems across the campus buildings.
19 AcknowledgementEnergy Management Division of Facilities Management Department at UABSigma Xi Scientific Research SocietyDepartment of Civil, Construction, and Environmental Engineering at University of Alabama at Birmingham