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HomeMy WebLinkAboutDesign NarrativeAPPENDIX B DESIGN NARRATIVE ASLC Heat Recovery Project AEA Renewable Energy Fund Round VII Application DESIGN NARRATIVE FOR HEAT RECOVERY PROJECT TO RECOVER WASTE HEAT FROM EXHAUST FAN EF-4, EXHAUST FAN EF-6, IT SERVER ROOM, TISSUE STORAGE ROOM, ELECTRICAL ROOM, MECHANICAL ROOM, NECROPSY FREEZER CONDENSER FOR ALASKA SEALIFE CENTER 301 RAILWAY AVENUE SEWARD, ALASKA 99664 USA FINAL DESIGN NARRATIVE COMPLETED AUGUST 5, 2010 UPDATED FOR AEA ROUND 7 GRANT APPLICATION - SEPTEMBER 2013 Your Clean Energy TABLE OF CONTENTS EXECUTIVE SUMMARY — HEAT RECOVERY SYSTEM COMPONENT COSTS.......................3 INTRODUCTION (UPDATED FROM THE AUGUST 5, 2010 EVALUATION BY YCE)...............4 EXISTING ASLC HEAT PRODUCTION AND DESIGN DEMANDS (NAMEPLATE CAPACITY).5 MONTHLY SEA WATER TEMPERATURES AND HEAT PUMP / HEAT RECOVERY OPERATION..............................................................................................................................6 HEAT RECOVERY FROM EXHAUST FANS AND OTHER EXISTING BUILDING SOURCES ...7 OPINION OF PROBABLE COST FOR HEAT RECOVERY PROJECT.......................................8 'Celebrate the power of nature' . with YourCleanEnergy . DESIGN NARRATIVE ASLC HEAT RECOVERY PROJECT 9/18/13 PAGE 3 OF 10 EXECUTIVE SUMMARY - HEAT RECOVERY SYSTEM COMPONENT COSTS Summary Opinion Of Probable Cost Heat Recovery System - ASLC Heat Pump Proiect EF-4 $49,200 EF-5 &IT Servers $40,910 Animal & Necropsy Freezers $7,800 FC-701 & 702 $23,566 Tissue Storage (FC-703) $25,625 Controls and Instrumentation $45,500 Subtotal before contingency $192,601 20% Construction Contingency $39,000 $231,601 Construction Inspection Services $18,399 Total Project Cost $250,000 NOW Evaluation Of Heat Recovery System [with EF-0 & F--5 wade heat recovery as financial driver) - AGAINST HEATING OIL Net Present Worth (NPW) I _ _ _ YEAR I Descripton Of Financial Bement 0 1 2 3 4 5 10 20 Total Project Cost For Heat Reemery $250.000 Gnd Elect -1 5 hp PG Pumps 4%/yresc $1 020 $1,061 $1.103 $1,147 $1,193 $1.241 $1 510 $2.235 20 yearsof Glycol Pumping - Present Worth $20,400 $1 020 $1 020 S1,020 $1,020 $1.020 $1 020 $1.020 O&M Cost with 6%/yr inflation $3 000 $3.180 $3 37'. $3,573 $3,787 $4 015 $5,373 $9.621 20 yrs; O&M Present Worth $73,728 53,058 $3 -7 $3 176 $3,237 $3,300 $3,630 $4 39' #2 Fuel Oi' Savad Wth 6%/yrescalation $53.918 $57 153 $60582 $64,217 $68.070 $91,093 $163.134 Discount Rate Factor (P/F) 4% 09615 C.9246 0 889 1.8.548 08219 0.6756 04564 20 yrs#2 fuel oil saved -Present Worth $1,250,081 $51.842 $52 844 $53.858 $54.893 $55,947 $61.543 $74.454 Net Present Worth of Project $905,953-$202,235-$153.528 -$103.867 -$53,232 $272.125 $905.953 Years To Payback Initial Investment Payback = 5 years Classic formula: pw(B) I Q + pw (O&M)) - 3.63 Benefft / Cost Ratio Description Of Financial Bement YEAR 20 0 1 2 3 4 5 10 Total Project Cost For Heat Recovery $250.000 G^d Elect - " 5 hp PG P-mp • Year 1 $1.020 $1,061 $1,103 $1 147 $1 193 $1 241 $1 5'0 $2 235 20 years Glycol Pumping - Present Worth $20,400 $1 020 $1,020 $1,020 $1.020 $1.020 $1.020 $1.020 O&M Cost - Year 1 $3 000 $3.180 $3 371 $3,573 S3,787 $4 0.5 $5 373 $9.621 20 yrs O&M - Present Worth $73,728 $3,058 $3117 $3176 $3,237 $3 300 $3 630 S4 391 #2 Fuel Oi; Saved In Year' $54.043 $57.286 $60,723 $64,366 $68.228 $91 305 $163 513 D scount Rate Factor (P/F) 4% 09615 09246 0 889 08548 0.8219 06756 0.4564 20 yrs boiler electricity saved - Present Worth $1,252.981 $51.962 $52 966 $53 983 $55.020 $56'M $61 685 $74 627 Net Present Worth of Project $908,853 -$202,115 -$153.286 -$103.499 -$52 737 $980 $273437 $908 853 Years To Payback Initial Investment Payback = 5 years votes Current rate of gnd electricity -s SO 104 (4%'year esc) current cost of heat-ng o is $3.65/gallon (6%/year esc) input = annual glycol pumping cost = 15 HP pump running 2417 @ S0101KWH input = value of annua #2 fuel or saved = 19' MBH 'EF4 & EF-5 runnng 24.7. = 13.936 gal/yr @$3 65/ga ,nput = value of electric haler saved = 19' MBH (EF4 & EF5 running 24/7) = 490,236KWWyr @SO ' 04/KWH 'Celebrate the power of nature" with You rC'eanEnergy DESIGN NARRATIVE ASLC HEAT RECOVERY PROJECT 9/1 a/13 PAGE 4 OF 10 INTRODUCTION (UPDATED FROM THE AUGUST 5, 2010 EVALUATION BY YCE) The Alaska SeaLife Center (ASLC) is the only marine research aquarium in the State of Alaska and one of the northern most on the planet. The Seward Association for Advancement of Marine Science (SAAMS) is the non-profit corporation that established the Alaska SeaLife Center which was opened to the public in May 1998. The Exxon Valdez Oil Spill Settlement Fund provided $26 million to help build the $56 million facility. Other funding was provided through grants, revenue bonds, and corporate and private donations. The city of Seward donated the seven -acre waterfront site for the SeaLife Center. The facility was designed in 1996 by Livingston Slone, Inc., an architecture, planning and design firm based in Anchorage. While the SeaLife Center receives approximately 20% of its annual budget from visitor fees and retail sales; the remaining portion of the financial income needed to maintain the facility is derived from federal, private and foundation grant funding. With recent escalations in both electricity and heating oil costs, and reductions in federal funding, the SeaLife Center is motivated to reduce its monthly operational expenses through both energy efficiency and evaluating heat production methods that are more cost effective than continued direct use of heating oil and grid electricty. The SeaLife Center is also interested in reducing its current production of greenhouse gas (CO2) as part of the greater mission to preserve and protect the fragile marine environment of Alaska. Under the direction of CEO Ian Dutton and General Manager Darryl Schaefermeyer, the Alaska Sealife Center secured YourCleanEnergy LLC to complete an economic evaluation of a seawater heat pump system in March 2009. In 2010, ASLC received for a demonstration seawater heat pump project a total of $426,000 in grant funding from the Alaska Center For Energy & Power (ACEP); and an additional $286,000 in grant funding from the Alaska Energy Authority (AEA). These grant funds provided a total project budget of $713,300 for the design, procurement, construction and construction inspection of the new system. In July, 2010, ASLC secured the services of YourCleanEnergy LLC in association with EDC, Inc, to complete mechanical and electrical design of the demonstration seawater heat pump system. The final design is expected to be completed by early November 2010, and ASLC plans to procure equipment through the fall and winter so that installation of the new system can be completed by March 2011. It is self evident that the months of March through May present the coldest seawater temperatures that will be encountered during the heating season, and thus this is an ideal time to start up and commission the system. The demonstration -seawater heat pump prMecthas had the desired result# reducing-heating-W-usage associated with ASLC's air handlers, slab heat and with domestic hot water production. The heat recovery project described herein has the additional goal of making use of exhaust fan and other waste heat in the building to enhance the performance of the heat pump system. In 2012, with the assistance of grant monies from the M.J. Murdock Foundation, ASLC secured the services of YourCleanEnergy LLC in association with EDC, Inc, to complete mechanical and electrical design of the proposed heat recovery system. Using current construction cost opinions, fuel and electricity escalation, labor escalation and discount rate, the Net Present Worth evaluation of this project indicates a very favorable economic return on investment. The payback is in the range of five years using only the energy recovered from Exhaust Fans EF-4 and EF-5, these fans currently waste heated air to the outside. The quantity of heated that is anticipated to be recovered from the exhaust fans on a continuous basis is in the range of 191 MBH, depending on the temperature of the evaporator loop. ASLC is making application to the Alaska Energy Authority Renewable Energy Grant Fund Round 7 as a means of assisting with the construction cost of the heat recovery project. If successful in receiving grant funding under this AEA program, the heat recovery project would be installed in the fall of 2014 ® "Celebrate the power of nature th You Gear.Energy DESIGN NARRATIVE ASLC HEAT RECOVERY PROJECT 9118/13 PAGE 5 OF 10 EXISTING ASLC HEAT PRODUCTION AND DESIGN DEMANDS (NAMEPLATE CAPACITY) For the purpose of reference, the following table is included to show the design capacity and demands of existing heating equipment and loads in the ASLC facility (heat pumps are not included): SUMMARY OF ASLC HEAT PRODUCTION & DESIGN DEMANDS (NAMEPLATE) Heat Production Eauioment Delivers Heat To: MBH* %of Total Cauaoity Boiler No. 1 - Fuel Oil - 87.9% Eff 185F Main Glycol Loop 2911 38.60% Boiler No. 2 - Fuel Oil - 87.9% Eff 185F Main Glycol Loop 2911 38.60% Boiler No. 3 - Electric - 500 KW 185F Main Glycol Loop 1706 22.62% Electric Unit Heater (EUH-1) ]4 0.19% Total Heating Capacity 7542 *Fuel oil boilers rated at 24 gal #2 fuel oil/hr x 138 MBH/gal fuel oil x 87.9% eff= 2911 MBH Heat Demand Eauioment Receives Heat From: MBH %of Total Demand Pavement Heating - 12,000 LF 185F Main Glycol Loop via HX 1 1204 15.27% AHU-5 185F Main Glycol Loop 1782 22.61% AHU-6 185F Main Glycol Loop 1342 17.02% AHU4 185F Main Glycol Loop 521 6.61% AHU-7 185F Main Glycol Loop 488 6.19% AHU-8 185F Main Glycol Loop 244 3.10% AHU-1 185F Main Glycol Loop 144 1.83% AHU-2 185F Main Glycol Loop 130 1.65% AHU-3 185F Main Glycol L000 Z8 0,99% Total AHU Demand 4729 59.990/0 Duct Coil HC-1 (Lobby) 185F Main Glycol Loop 170 2.16% Duct Coils HC-1 thru HC 24 185F Main Glycol Loop 396 5.02% Ceiling Unit Heaters (CUH -1, 2, 3) 185F Main Glycol Loop 140 1.78% Wall Unit Heaters (UH-1, 2, 3) 185F Main Glycol Loop 74 0.94% V Tube Fin BB Heaters (@600 LF) 185F Main Glycol Loop 468 5.94% 1-1/4" Tube Fin BB Heaters (@200 LF) 185F Main Glycol Loop 286 3.63% Total Unit Heater Demand 1534 19.46% Domestic Hot Water Tank, 630 Gal 185F Main Glycol Loop 4J6 6.28% Total Design Heat Demand 7883 Notes: 1. Heating demands listed above taken from 1996 Livingston Slone Design Drawings 2. Max monthly fuel oil usage was 18,442gal/mo in Mar07 = 3421 MBH avg demand P1-Celeb ate 'he power of • ature .with YourCleanEnergy ... DESIGN NARRATIVE ASLC HEAT RECOVERY PROJECT 9/18113 PAGE 6 OF 10 MONTHLY SEA WATER TEMPERATURES AND HEAT PUMP / HEAT RECOVERY OPERATION Seawater temperatures recorded at the ASLC raw seawater wet well for five years were presented in the March 28, 2009 Evaluation by YCE. For the purpose of reference they are again shown below, followed by a discussion of their effect on heat pump operations. Seawater temperatures recorded for the past five years (2003 through 2008) at the Alaska SeaLife Center's raw seawater influent well were compiled to determine the average seawater temperature for each month. The maximum monthly seawater temperature (56F) and minimum monthly seawater temperature (37F) were also identified. As shown in the graph below, it is evident that the large mass of seawater contained in Resurrection Bay is absorbing a significant quantity of solar heat during the summer months and releasing the same heat slowly through the winter heating season. ASLC Raw Seawater Temperatures for 2003-2008 56 Maximum Monthly Sea,. ater Temperature 51 (F) Average d Monthly Seawater 4fi Temperature p (F) -Minimum 41 - Monthly Seav,ater e. Temperature � (F) H 36 Jul Aug Sept Oct Nov Dec Jan Feb Mar Apr May Jun The amount of heat contained in the influent seawater that can be used to supply heat pumps is a function of the seawater flow rate, seawater temperature, and the amount of temperature drop achieved in the seawater heat exchanger. The most critical time of the heating, season for heat pump op.eratiQn is the spring months of February, March, April and May, when seawater temperatures typically fall below 41 F. The coldest seawater temperature considered in this Design Narrative is 37 F; this represents the coldest seawater temperature recorded at ASLC in the past five years. The effect of colder seawater temperatures on the efficiency of the heat pump system is significant because it reduces the amount of heat that can be extracted from the evaporator loop by the heat pump. Another factor of consideration for cold seawater temperature design is the percentage of propylene glycol used in the evaporator loop. In the case of this project, with coldest seawater temperature of 37F, the coldest evaporator entering temperature at the heat pump is anticipated to be 35F. The coldest evaporator leaving temperature will then be 27F. It is necessary to freeze protect the evaporator loop fluid to 17F (10 degrees F below its coldest leaving temperature); this requires a minimum 20% propylene glycol concentration in the evaporator loop. This project proposes the use of heat recovery as a means of adding additional low cost heat into the evaporator loop in advance of the heat pump. Keeping the evaporator entering temperature as high as possible will increase the coefficient of performance (COP) of the heat pump system; and potentially reduce the percentage of PG required in the evaporator loop. The heat recovery potential identified in this project of 361 MBH; the anticipated temperature rise in the evaporator loop as a result of heat recovery is estimated to range from 1.5F to 3.OF. W.I. "Celebrate the power of nature' .with YourCleanEnergy . DESIGN NARRATIVE ASLC HEAT RECOVERY PROJECT 9/18/13 PAGE 7 OF 10 HEAT RECOVERY FROM EXHAUST FANS AND OTHER EXISTING BUILDING SOURCES Recovered heat from various sources is also added to the evaporator loop to keep the glycol temperature entering the heat pump evaporators as high as possible to improve system performance. Heat is recovered by circulating the evaporator loop glycol through coils placed in exhaust ductwork from EF-4 and EF-5. Glycol is also circulated to a fan coil unit in the IT room (replacing the existing undersized AC unit) to provide cooling. Similar fan coil units are located in the main Electrical Room 018 and in the Mechanical Room 010 to extract heat given off by the equipment (and secondarily provide cooling of the rooms.) The IT room and main electrical room fan coils will have thermostatic controls to avoid overcooling. In addition, heat from the refrigeration condensing units serving the Animal Food Storage Freezer and the Necropsy Freezer will be extracted by converting the existing air-cooled condensing units to liquid -cooled. Two options exist for the two refrigeration units: Addition of a heat exchanger to the existing unit while maintaining the air cooled condenser coil, or complete replacement of the condensing units with packaged liquid cooled condensing units. Heat recovery glycol circulation pumps will be constant speed with one pump operating continuously and the second in standby with automatic switchover in case of primary pump failure to maximize heat recovered from the sources. w iES. HEA- HEAT 1 ALL HEAT RECOVERY LOOP RECOVERY gECOVERY P P NG IS TYPE L COPPER FROM FROM EF-4 BOILER 2 ALL PIPING TO BE INSULATED 149 MBH RM 010 TO PREVENT CONDENSATION 30 MBH "•'1=' F. 3. ALL HEAT RECOVERY COILS GPI _ _ WILL HAVE CONDENSATION DRAINS 4. ALL HEAT RECOVERY COILS W ILL HAVE BALANCING OR FLO' HEAT REGULATING VALVE RECOVERY FROM RM 118 V 8 GPM 30 MBH HEAT HEAT 2 RECOVERY FROM NEW FRO 1 NEW ANIMAL NECROPSY FOOD CONDENSER STORAGE 30 AIBH 40 MBH T y HEAT > RECOVERY } 1 FROM EF•5 i 42 MBH `l 2" 11. 8 GPRI� 31. 45 GPRI __` I0 GPM TOTALHEAT HEAT RECOVERY RECOVERED FROM HEAT RECOVERY 351 MBH IT Rh1 GLYCOL PUMPS 30 MSH FROM HX-3 SEAWATER _} TO HPA 8 HP-2 HEAT EXCHANGER EVAPORATOR LOOP HEAT PUMPS HEAT RECOVERY 1@35F) 2216PG 365F1 SYSTEM SCHEMATIC NO SCALE E0 'Celebrate the power of nature" with YourCleanEnergy DESIGN NARRATIVE ASLC HEAT RECOVERY PROJECT 9/18/13 PAGE 8 OF 10 OPINION OF PROBABLE COST FOR HEAT RECOVERY PROJECT Summary Opinion Of Probable Cost Heat Recovery System - ASLC Heat Pump Project EF-4 $49,200 EF-5 &IT Servers $40,910 Animal & Necropsy Freezers $7,800 FC-701 & 702 $23,566 Tissue Storage (FC-703) $25,625 Controls and Instrumentation $45,500 Subtotal before contingency $192,601 20% Construction Contingency $39,000 $231,601 Construction Inspection Services $18,399 Total Project Cost $260,000 Exhaust Fan 4 Heat Recovery & Circ Pumps - Opinion Of Probable Cost Material Labor Item Qtv Unit Cost Man Hrs Pumps 701 & 702, 1.5HP motors 2 EA $3,000.00 16 6" x 3" Sch 80 PVC tee 2 EA $400.00 4 3" Sch 80 PVC Piping 16 LF $50.00 4 3" butterfly Valve 2 EA $400.00 4 2" butterfly valve 4 EA $300.00 4 2" Check Valve 2 EA $200.00 4 2.5" Sch 80 piping 100 LF $40.00 24 2" Sch 80 PVC Piping 180 LF $30.00 24 Cooling Ccil CC.6 1 EA 47,500-W 1-6 Hangers and ductwork for CC-6 1 EA $2,000.00 8 3/4" Sch 40 PVC condensate drain 40 LF $20.00 4 Fitting Allowance 1 LS $2,000 16 Shipping for above 1 LS $2.000 0 Electrical & controls 1 LS $2,000 16 by A. Baker 7/14/12 Labor Labor Rate Extension Item Total $75 $1,200 $7,200 $75 $300 $1,100 $75 $300 $1.100 $75 $300 $1,100 $75 $300 $1,500 $75 $300 $700 $75 $1,800 $5,800 $75 $1,800 $7,200 -$7� -$I,?M - W $75 $600 $2,600 $75 $300 $1,100 $75 $1,200 $3,200 $75 $0 $2.000 $75 $1,200 $3,200 $10,800 $46,500 Contractor Overhead & Profit (25%) On Labor Only Celeb•ate the powe, of nature with YourCleanEnergy 2 700 $49,200 DESIGN NARRATIVE ASLC HEAT RECOVERY PROJECT 918/13 PAGE 9 OF 10 Exhaust Fan 5 & IT Room Heat Recovery - Opinion Of Probable Cost by A. Baker 7/14/12 Material Labor Labor Labor Item Qtv Unit Cost/Unit Man Hrs Rate Extension Item Total 2.5" Sch 80 piping 100 LF $40 24 $75 $1,800 $5,800 2" Sch 80 PVC Piping 102 LF $30 24 $75 $1,800 $4,860 1.5" Sch 80 PVC Piping 30 LF $25 16 $75 $1,200 $1,950 1.25" Sch 80 PVC Piping 180 LF $20 32 $75 $2,400 $6,000 Cooling Coil CC-7 1 EA $3,000 16 $75 $1,200 $4,200 Hangers and ductwork for CC-7 1 EA $1,200 8 $75 $600 $1,800 3/4" Sch 40 PVC condensate drain 40 LF $20 4 $75 $300 $1,100 Fan Coil FC-704 1 EA $2,800 8 $75 $600 $3,400 Hangers and valves for FC-704 1 LS $2,000 4 $75 $300 $2,300 Fitting & Valve Allowance 1 LS $2,000 16 $75 $1,200 $3,200 Shipping for above 1 LS $1,500 0 $75 $0 $1,500 Electrical & controls 1 LS $1,200 8 $75 600 $1,800 $12,000 $37,910 Contractor Overhead & Profit (25%) On Labor Only $3.000 $40,910 Animal Food & Necroosv Freezer Heat Recovery - Opinion Of Probable Co: by A. Baker 7/14/12 Material Labor Labor Item Qty Unit Cost Man Hrs Rate 1" Sch 80 PVC Piping to/from HX-7 30 LF $15 4 $75 1" Sch 80 PVC Piping to/from HX-8 20 LF $15 4 $75 HX-7 For Animal Food Condenser 1 EA $800 8 $75 1" ball valve for HX-7 2 EA $100 4 $75 pressure regulating valve for HX-7 1 EA $200 2 $75 HX-8 For Necropsy Condenser 1 EA. $800 8 $75 1" ball valve for HX-8 2 EA $100 4 $75 pressure regulating valve for HX-8 1 EA $200 2 $75 Fitting & Valve Allowance 1 LS $400 4 $75 Shipping for above 1 LS $500 0 $75 Labor Extension Item Total $300 $750 $300 $600 $600 $1,400 $300 $500 $150 $350 $600 %1400 $300 $500 $150 $350 $300 $700 $0 $500 $3,000 $7,050 Contractor Overhead & Profit (25%) On Labor Only 50 $7,800 i .r "Celebrate the power of nature" with YourC;eanEnergy DESIGN NARRATIVE ASLC HEAT RECOVERY PROJECT 9/18/13 PAGE 10OF 10 Electrical & Mechancal Room Heat Recovery - Opinion Of Probable Cost by A. Baker 7/14/12 Material Labor Labor Item O yt Unit Cost Man Hrs Extension Item Total 1.5" Sch 80 branch piping to FC-701 80 LF $20 8 $600 $2,200 1.25" Sch 80 PVC branch Piping to FC-702 12 LF $18 4 $300 $516 2" Sch 80 PVC common Piping 60 LF $25 8 $600 $2,100 Fan Coil FC-701 1 EA $2,800 8 $600 $3,400 Hangers and valves for FC-701 1 EA $1,200 4 $300 $1,500 3/4" Sch 40 PVC condensate drain 40 LF $10 4 $300 $700 Fan Coil FC-702 1 EA $2,800 8 $600 $3,400 Hangers and valves for FC-702 1 LS $2,000 4 $300 $2,300 Fitting & Valve Allowance 1 LS $800 16 $1,200 $2,000 Shipping for above 1 LS $1,500 0 $0 $1,500 Electrical & controls 1 LS $2,000 8 600 $2,600 $5,400 $22,216 Contractor Overhead & Profit (25%) On Labor $1,350 $23,566 Tissue Storage Room Heat Recove FC-703 - O i ion Of Probable Cost by A. Baker 7/14/12 Material Labor Labor Labor Item Q-t Unit Cost Man Hrs Rate Extension Item Total 2" Sch 80 PVC branch Piping to FC-703 160 LF $25 24 $75 $1,800 $5,800 Fan Coil FC-703 1 EA $4,500 8 $75 $600 $5,100 Floor stand and valves for FC-703 1 EA $1,200 4 $75 $300 $1,500 3/4" Sch 40 PVC condensate drain 20 LF $10 4 $75 $300 $500 Condensate sump pump 1 EA $500 4 $75 $300 $800 FZimdampers 2 EA $500 4 $75 $360 $13W Return Grille 24" x 30" 1 EA $200 4 $75 $300 $500 Square ductwork & transitions 1 LS $800 8 $75 $600 $1,400 12" dia round duct 50 LF $10 16 $75 $1,200 $1,700 12" round duct balancing dampers 3 EA $200 4 $75 $300 $900 24" x 24" ceiling diffusers 3 EA $100 4 $75 $300 $600 Fitting & Valve Allowance 1 LS $800 4 $75 $300 $1,100 Shipping for above 1 LS $1,800 0 $75 $0 $1,800 Electrical & controls 1 LS $600 4 $75 $300 900 $23,900 Contractor Overhead & Profit (25%) On Labor Only $1,725 $25,625 0 'Celebrate the power of nature' with Your0eanEnergy