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New Applied Technology, Efficiency, and Lighting InitiativeCorporate Agreement # 114-A-00-05-00106-00Energy Audit Report of the#9 Georgian Technical University BuildingThe information provided in this report is not official U.S. Government information and does not representthe views or positions of the U.S. Agency for International Development or the U.S. Government


Energy Audit Report of the#9 Georgian Technical University BuildingPrepared for: USAID/Caucasus11 George Balanchine Street,0131 Tbilisi, GeorgiaPrepared by: NEW APPLIED TECHNOLOGY, EFFICIENCYI. Chavchavadze AvenueAND LIGHTING INITIATIVE (NATELI) II Blind Alley, 4-8, Apartment 6Tbilisi, 0105, GeorgiaTel: +995 32 50 63 43Fax: +995 32 93 53 52Prepared by Sustainable Development and Policy Center for Winrock InternationalTbilisiJune, 20112


Contents1 Summary .................................................................................................................................... 42 Introduction ................................................................................................................................ 52.1 Background .......................................................................................................................... 52.2 The Project Development Process ..................................................................................... 53 Project Organisation ................................................................................................................ 74 Standards and Regulation ......................................................................................................... 75 Building State Description ........................................................................................................ 85.1 General Conditions ................................................................................................................. 85.2 Heating System ..................................................................................................................... 105.3 Lighting System .................................................................................................................... 115.5 Outdoor .................................................................................................................................. 126 Energy Consumption ............................................................................................................ 126.1 Measured Energy Consumption .......................................................................................... 126.2 Calculated and baseline energy consumption .................................................................... 127 Energy Efficiency Potential ................................................................................................... 148 Energy Efficiency Measures ................................................................................................. 158.1 List of Measures .................................................................................................................... 158.2 Measures ............................................................................................................................... 169 Environmental Benefits ........................................................................................................... 19Photo materials of the existing situation in the #9 GTU building ............................................ 203


1 SummaryThe baseline for energy consumption of the # 9 Georgian Technical University (GTU) Building, toensure normal operating conditions, is approximately 439,832 kWh/year for space heating suppliedby a local boiler and 116,892 kWh/year for electricity with a total energy consumption of 556,724kWh/year.The Energy Auditing team identified a considerable energy efficiency improvement potential forthis building:Savings in delivered energy 266 879 kWh/yearNet savings 59343 GEL/yearInvestments 545301 GELPayback 9.2 YearsThe energy savings potential for the identified energy efficiency and renovation measures issummarised in the following table, with a ranking of measures and their profitability - Net PresentValue Quotient (NPVQ). 1EE Potential - Energy Audit#9 GTU building Heated area: 2875.0 m²EE measures Investment Net savings Payback NPVQ[GEL] [kWh/yr] [GEL/yr] [year] *1. Installation of modern heating system 430193 83651 44 781 9.6 0.202. Installation of the double glazed metalplastic windows80 380 111851 6767 11.9 0.203. Insulation of roof 20591 65990 3992 5.2 1.754. Renovation of the lighting system 14137 5387 3803 3.7 0.21Profitable EE measures1. Installation of modern heating system 430193 83651 44 781 9.6 0.202. Installation of the double glazed metalplastic windows80 380 111851 6767 11.9 0.203. Insulation of roof 20591 65990 3992 5.2 1.754. Renovation of the lighting system 14137 5387 3803 3.7 0.21Total of all profitable measures 545301 266879 59343 9.2 Based on a 3.5% real interest rateThe real interest rate used in these economic calculations is taken as 3.5%. This number derivesfrom a 15.1% nominal interest rate and the 11.2% official annual inflation rate. 2For investment and savings assumptions to be realized, all measures should be implemented asone project. The payback is the time it takes to repay the investments, based on equal annual netsavings. The figures have an accuracy of ±10-15%.The proposed savings for the package of profitable measures in delivered energy are divided intosavings per energy carrier:1 NPVQ is the ratio of NPV to the total investment: NPVQ= NPV/IWhere: NPV is today's value (discounted value) of the future annual net savings during the economic lifetime minus the investment.I is investment2 Annual inflation rate was taken from the National Bank of Georgia web site: www. nbg.gov.ge.4


Energy carrierUnitPresent After measures Savings(baseline)Electricity kWh/year 116892 103894 12997Local heating kWh/year 439832 185950 253882Gas needed forlocal heatingm 3 /year 46990.6 19866.5 27124.1There is no installed modern space heating system in the #9 GTU building operating in any ofbuilding area. After the collapse of the USSR the GTU administration couldn’t restore central spaceheating in the building. This situation caused an overloading of the indoor electricity system, whichresulted in damaged wiring, because it was not designed for such high loads. Currently only a limitednumber of local electric heaters are used in winter in the #9 GTU building.Currently the GTU administration is planning to renovate the building and set up a large-scalecomputer center, in which they will install a space heating system in the abovementioned buildingand for this they are expecting to use natural gas as a fuel for the boiler.The above table includes the assumed amounts of gas that will be necessary for heating as it isat the present (baseline) condition and after ENCON measures.The reduction of CO 2 emissions achieved by the implementation of all measures identifiedthrough the energy audit is estimated as 56.442 tons/year.2 Introduction2.1 BackgroundUnder the NATELI project administrated by USAID, within the scope of the work for theSustainable Development and Policy (SDAP) Center, this project includes carrying out energy auditsof the Georgian Technical University’s buildings. In spring 2011 the university administration madethe decision to renovate the Georgian Technical University’s (GTU) Building #9, with the aim ofsetting up a large-scale computer center equipped with 500 computers.The university administration selected the #9 GTU Building for conducting the energy audit sothat major renovations will comply with the implementation of energy efficiency measures.The energy audit of the abovementioned building was carried out using both ENSI InternationalKey Number Software and Profitability Software Programs.Currently in the winter the #9 GTU building only uses a limited number of electric space heaters,some of which are not even factory produced and cannot cover all the heat losses of the buildingbecause their installed capacity is less than is needed by the baseline. This situation causesuncomfortable conditions for university staff and students. It is known that comfortable conditionsresult from a properly designed heating system with a heat load that must comply with theappropriate heat losses.After the collapse of the USSR GTU couldn’t restore central space heating in the building. Thissituation caused an overloading of the indoor electricity system, because it was not designed forsuch high loads. The damaged wiring has recently been partly renovated.The #9 GTU Building was constructed in the 1980-s, and is characterized by a medium thermalcapacity of the building envelope. The decision to undertake the energy audit was made within theframework of the program activity for promoting Energy Efficiency in Higher Education with GTU.The preliminary evaluation of the energy consumption in the #9 GTU building shows that anacceptable level of the energy efficiency could be reached through the installation of a moderncentral space heating system. Thus the aim of the energy audit is to estimate the ENCON (energyconservation) potential and propose cost saving measures for this building. The results of theassessment and an evaluation of these measures are given in this report.The goal of the project is to reduce the energy costs compared to the baseline, improve theindoor environment, and ensure more efficient operation and maintenance of the building and thetechnical appliances and equipment.2.2 The Project Development ProcessProject development includes the evaluation and implementation of profitable energy efficiency(EE) measures in the building. Each building is unique and each project must be treated separatelyto find individual energy saving possibilities. The building owners might have various plans for5


enovation and different requirements for the profitability of EE measures. Hence, the total ProjectDevelopment Process is divided into six main activities as illustrated in the flow chart below.1. Project IdentificationProjectIdentification2. ScanningScanning3. Energy Audit4. Business PlanSimplifiedAuditingImprovementPotentialBusiness PlanningDetailed Auditingwith guarantee5. ImplementationImplementationOperation6. Operation6


3 Project OrganisationName of project/building/site:#9 GTU BuildingAddress:77 Kostava Street, TbilisiContact person:Gia ArabidzePhone: 599 75 24 58Fax:Beneficiary. Results of an evaluation of energy consumptionRole in the project:of GTU #9 will be communicated in the form of an EnergyAudit Report.Building owner:Ministry of Economy and Sustainable Development ofGeorgiaContact person for the Energy Audit: Karina MelikidzeAddress:#34 Al. Kazbegi Ave. plot # 3, office 104, TbilisiPhone: (99532) 220 67 73Fax: (99532) 242 00 60Role in the project:Director of the SDAP CenterExpert:Karina MelikidzePhone: 593 14 62 54Role in the project:In charge of conducting an energy audit with the Key Numbersoftware program and writing a reportConsultant:O. Purtseladze – GTU full-time ProfessorPhone: 899 14 13 26Role in the project:Energy AuditorConsultant:N. Meparishvili – GTU tenured ProfessorPhone: 593 95 53 58Role in the project:Energy Auditor4 Standards and RegulationThe following Standards and Regulations are relevant to energy efficiency and renovationmeasures: Heating, Ventilation and Conditioning SNIP 2.04.05-86 Boiler Plant Sanitary Regulations Construction Thermal Engineering SNIP II-3-79 *From these standards and regulations, the following requirements are relevant: Heating, Ventilation and Conditioning SNIP 2.04.05-86 Boiler Plant Sanitary Regulations Construction Thermal Engineering SNIP II-3-79 *7


U value, W/m 2 K 1.74 1.74 1.74 1.74The coefficient of thermal conductivity for bricks was taken as λ=0.70 W/m K with thickness δ=0.25m, because total thickness was measured as δ= 0.29 m, so δ=0.02 m was taken for eachinside and outside plaster layers.Material type m1Required thermal resistance value was calculated as:R req = 1/ 8.7 +0.02/ 0.76 + 0.25/0.7 +0.02 /0.61 +1/23= 0.575 m 2 K/WApproximate heat transfer value: U= 1/0.575= 1,74 W/m 2 KInsulation type 1 n/aThe exterior walls are built from bricks with a thickness of δ= 0.25m. The #9 GTU Building isconstructed by a frame panel construction method. It is known that the thickness of the walls in theSoviet era was defined based on the technology and structural requirements rather than on thermalengineering ones. The technology and structural requirements benchmark approach in the sameclimatic conditions required the following thicknesses: for block walls – 40 cm, for panel walls – 30cm, and for frame panel buildings – 25 cm. Calculations proved that the building envelope has amedium thermal capacity. The energy audit team was provided with floor layouts of the #9 GTUbuilding. The calculation of the U-value for walls is based on the results of a site inspection and isdefined as U wall =1.74 W/m 2 K.WindowsGeneral evaluation of the condition of windowssingle glazed windows with wooden framesTotal area windows 616.0 m² U value (average) 5.8 W/m²KOrientation Material 1 Type 2 Size A x B Area Q-ty g Total Joints U valuem m 2 n m 2 m W/m 2 KN W 1G5.0 X3.00,5 X0,253 x 2.61.2x1.81.6x2.81.6x2.21 5.00,1257.82.164.483.524326220,58600.37515.612.968.967.045,8EW1G3.8x2.22.2x 3.05.4x2.22.8x0.74.4x2.28.366.611.881.969.683111110,58∑=104.9425.086.6130.681.969.685,8∑=174.0S W 1GW W 1G5.4x2.01.1x2.00.5x0.41.2x1.83.2x2.25.3x2.210.82.20.22.167.0411.6666231210,580.5864.813.2∑=78.00.46.487.04244.865,85.8TotalMaterial 1Type 2615.72~~616.00;.58∑=258.78Wood (W), Aluminium (Al), Plastic (P), Steel (St)Single-frame (S), Double-frame (D), Bonded frame (B),Single glazed (1G), Double glazed (2G), Triple glazed (3G)9


U values for windows were taken after site inspection as general U-value for windows in buildingsconstructed in Georgia during the Soviet era.DoorsGeneral evaluation of the condition of doorsType of doorsacceptablemetalNo. of doors1.8x2.8Total area doors 5.04 m² U value (average) 6.0 W/m²KRoofGeneral evaluation of the condition of the roofpoorTotal roof area 1030 m² U value (average) 1.71 W/m²KMaterial Insulation Insul. thickn. Slab thickn. Avg. temp. Area URoof typetype typemm°C m² W/m²Kflat roof m1 mineral wool σ=0.05m σ =0.2m n/a 1030 0.54TotalMaterial type m1Insulation type i1Thermal engineeringcalculation of the R- valuefor roof with the enhancedenergy efficiencyreinforced concrete slab σ 1 =0.2m, λ=1.32 W/m0Cmineral woolWith the purpose of improving thermal performance of the roof it was decided to insulateit with a mineral wool blanket. Thermal engineering properties of roof constructed duringthe Soviet era have been assessed as R 0=0.585 m 2 C/W based on the Soviet Thermalengineering codes requirement. Roof insulation has been considered with constructionmaterials that are given in the direction from bottom to top starting from reinforcedconcrete slab:-waterproofing layer-glass wool blanket -σ=0.05m, λ=0.04 W/m 0 C-waterproofing layer-cement sand covering σ= 0.02 λ=0.93 W/m 0 C-waterproofing layerR=0.585+0.05/0.04+0.02/0.93=1.8565 m 2 C/W Accordingly:U=1/1.8565=0.54 W/m 2 CFloorGeneral evaluation of the condition of the flooracceptableTotal floor area 1030 m² U value (average) 1.30 W/m²KType of floorfloor located over basementFloor construction materials n/a5.2 Heating SystemType of generation/supply/carrier n/aType of distribution systemn/aCondition of heating systemn/aBoiler/HX in operation since (year) n/a Heating system in operation since (year) n/aTotal capacity, heating system n/a kW Type of fuel gasMaterial and condition pipesn/a10


Material and condition insulationType/number of heat emittersAutomatic control systemIndividual heating appliances, typeQuantityQuantityn/an/apacespacesn/an/an/aelectric space heatersCapacity: 1.0-1.2 kWCapacity 0.6-1.0 kWAs it was already mentioned, a modern central space heating system is not installed in the GTU#9 building. The indoor temperature during the winter is below comfortable conditions. On averagethe temperature varies from 5 0 -9 0 C in classrooms reaching 12 0 C in a limited number of rooms thatare heated by electric space heaters. A huge potential for improvement of the indoor conditions wasidentified by emphasizing this component of the energy audit through suggesting the installation of amodern double pipe central space heating system for the whole building.5.3 Lighting SystemQuantity Installed AverageLuminariescapacity powerpieces kW W/m 2Fluorescent tubes 387 11.6 4.034Incandescent bulbs 20 2.0 0.697Total 148 4.0Type of control / commentsLightingAverage power demand 4.0 W/m 2Operation period 40 h/weekOperation period 38 weeks/yearMax. simultaneous power 4.73 W/m²A fluorescent bare batten lighting system exists in the #9 GTU building. It should be noted thatthe lighting system is in very poor condition, bare batten frames mostly are empty, and there are still20 incandescent bulbs that should be replaced by fluorescent bulbs. The total number of fluorescenttubes that should be installed constitutes 407.5.4 VariousQuantity Installed AverageVarious exploitablecapacity powerpaces kW W/m 2Computers 144 72.0 8.7Other machine equipment n/a n/ain labsTotal 8.7CommentsVarious exploitableAverage power demand 8.7 W/m 2Operation period 45 h/weekOperation period 38 weeks/yearMax. simultaneous power 25.0 W/m²11


Equipment present below isn’t under usage.Various unexplainableQuantitypacesInstalledcapacitykWAveragepowerW/m 2total various equipment n/a 1.0CommentsTotal 1.0Various unexplainableAverage power demand 0.5 W/m 2Operation period 10 h/weekOperation period 38 weeks/yearMax. simultaneous power 1.0 W/m²5.5 OutdoorNo outdoor appliances were identified, including lighting. Thus no outdoor measures wereconsidered.6 Energy Consumption6.1 Measured Energy ConsumptionCurrently only electricity is available as an energy carrier in the #9 GTU building, thus the buildingisn’t connected to a gas pipeline. An electricity bill hasn’t been provided to the energy audit teambecause the building doesn’t have a separate electricity meter. Several university buildings areconnected to a single electricity meter that is located in the GTU administrative building.The energy audit team assessed the energy consumption in the #9 GTU building based on a siteinspection and discussions with main stakeholders, staff, and GTU administration and analysed theelectricity consumption bills bearing in mind its compliance with real needs of the #9 GTU building.Tariff for electricity is 0.14889 GEL/kWhTariff for gas is 0.51 GEL/Nm 3The following net calorific value for gas and prices were used for future calculations.Energy Carrier Calorific Unit CommentsvalueGas 33 676 kJ/m3 or 9360 kWh/1000Nm3, value equal to 8045kCal/1000Nm3.Cost of heat taking into consideration caloric value will constitute: 0.51/(9.36x0.9)=0.0605GEL/kWh.6.2 Calculated and baseline energy consumptionThe baseline energy consumption for the #9 GTU building was determined as approximately439,832 kWh/year for space heating system with local boiler and 116,892 kWh/year for electricity. Atotal of 556,724 kWh/year is needed to cover the requirements for normal operational conditions inthe building when natural gas should be used as an energy carrier for the whole heating system.The building is characterized by medium thermal capacity properties of the building envelope.Based on the results of the site visit observations U values for the roof, walls and floor have beenselected.12


Energy BudgetThe calculated and measured energy consumption before and after implementation of energyefficiency and renovation measures is summarised in the following Energy Budget.Budget ItemENERGY BUDGET - ENERGY AUDITBefore EECalculatedBefore EEMeasuredBefore EEBaselineAfter EE andrenovation[kWh/m²year] [kWh/m²year] [kWh/m²year] [kWh/m²year]Heating 43.8 43.8 153.0 64.7Ventilation 0 0 2.8 2.8DHW 0 0 0 0Fans and Pumps 0 0 11.0 11.0Lighting 8.6 8.6 8.6 4.1Various 18.3 18.3 18.3 18.3Cooling 0 0 0 0Total 70.7* 70.7** 193.6*** 100.8****Budget ItemENERGY BUDGET - ENERGY AUDITBefore EECalculatedBefore EEMeasuredBefore EEBaselineAfter EE andrenovation[kWh/year] [kWh/year] [kWh/year] [kWh/year]Heating 125 828 125 828 439 832 185 950Ventilation 0 0 7989 7989DHW 0 0 0 0Fans/pumps 0 0 31 510 31 510Lighting 24 789 24 789 24 789 11 792Various 52 604 52 604 52 604 52604Cooling 0 0 0 0Total 203220* 203 220** 556 724*** 289 845***** From the computer model** Measured real consumption (in our case this column will duplicate calculated energy consumption, since electricity bills weren’t providedto the energy audit team)*** Normalised baseline after switching to gas without energy conservation measures**** After switching to gas with energy conservation measuresThe building was partly heated during the winter by individual electric and gas heating appliances,and the indoor air temperature throughout the whole building did not meet comfortable conditionsbecause all premises were not heated, only a limited part of them. The building’s thermal propertieswere designed without thermal insulation, which means that as they are, they hardly perform theirfunctions to insulate the premises from low outside temperatures without an incessant heat flow.Low numbers presented in the energy budget table confirm this information obtained from the siteinspection and assessment of project materials (column “Measured”). Based on this information, themodel was calibrated for energy consumption of the building in the Key Numbers Software Program(column “Calculated”).Column - “Baseline” presents the required energy consumption for comfortable conditions in thebuilding at present situation, or this is the amount of energy that will be consumed when a heatingsystem would operate during the winter. The last column – “After Implementation of EnergyEfficiency Measures”, presents the reduced numbers of energy consumption as a result of ENCONmeasures (Figure1).13


Figure 1. Annual energy consumption calculated by the ENSI Key Numbers Software Program7 Energy Efficiency PotentialThe numbers here result from a modelling of economic calculations made using the Economy(Profitability) Software Program. The Energy Auditing team has identified a considerable energyefficiency improvement potential for this building presented below:Savings in delivered energy 266 879 kWh/yearNet savings 59343 GEL/yearInvestments 545301 GELPayback 9.2 YearsThe energy savings potential for the identification of energy efficiency and renovation measures issummarised in the following table with a ranking of measures and their profitability (NPVQ):EE Potential - Energy Audit#9 GTU building Heated area: 2875.0 m²EE measures Investment Net savings Payback NPVQ[GEL] [kWh/yr] [GEL/yr] [year] *1. Installation of modern heating system 430193 83651 44 781 9.6 0.202. Installation of the double glazed metalplastic windows80 380 111851 6767 11.9 0.203. Insulation of roof 20591 65990 3992 5.2 1.754. Renovation of the lighting system 14137 5387 3803 3.7 0.2114


Profitable EE measures1. Installation of modern heating system 430193 83651 44 781 9.6 0.202. Installation of the double glazed metalplastic windows80 380 111851 6767 11.9 0.203. Insulation of roof 20591 65990 3992 5.2 1.754. Renovation of the lighting system 14137 5387 3803 3.7 0.21Total of all profitable measures 545301 266879 59343 9.2The presented savings in delivered energy are divided into savings per energy carrier:Energy carrierUnitPresent After measures Savings(baseline)Electricity kWh/year 116892 103894 12997Local heating kWh/year 439832 185950 253882Gas needed forlocal heatingm 3 /year 46990.6 19866.5 27124.1At present there is no modern hydronic space heating system installed with the gas-energycarrier in the #9 GTU building. A limited number of local electric heaters are installed.It is expected that a modern central forced air heating system with the fan coil units will be installedwith natural gas as its fuel. The university administration is planning to set up a large-scale computercenter in the #9 building, thus this type of heating system was proposed so that it can be combinedwith the ventilation/air conditioning system in the summer.Electricity and heat consumption as well as gas consumption amounts that will be necessary forheating purposes of the GTU # 9 building are presented in the above table at the present (baseline)level and after ENCON measures.The reduction of CO 2 emissions achieved by the implementation of all measures identifiedthrough the energy audit is estimated as 56.442 tons/year. These numbers result from the last table(see the section on “environmental benefits”). The savings divided by the energy carrier aremultiplied by the CO 2 emission coefficients. Then they are summarized and multiplied by the totalnumber of the building area (2875 m 2 ):4.5 x 0.3999 = 1.7955 (kg/m 2 a)88.3 x 0.202 = 17.8366 (kg/m 2 a)1.7955 + 17.8366 = 19.6321(kg/m 2 a)19.6321 x 2875 = 56.442 (t/year)8 Energy Efficiency Measures8.1 List of MeasuresThe following EE and renovation measures are evaluated and described in detail in the followingchapters. A table with information for each profitable measure is presented separately. A list ofprofitable EE measures is provided in the table below:1. Installation of a modern heating systemEnergy efficiency and renovation measures2. Installation of double glazed metal plastic windows3. Insulation of roof4. Installation of a new lighting system15


8.2 MeasuresDescription of all measures that have been evaluated is given below.Measure 1. – Installation of the heating systemExisting situation - Currently there is no installed modern heating system in the #9 GTU building.Description of measureIt was considered to design a modern air forced heating system that can be combined with aventilation/air conditioning system in summer. For this purpose a double pipe, modern air forcedheating system with fan coil units has been selected. The decision was made to connect theheating system of the #9 GTU building to the boiler room that is located in the backyard of theadministrative building. This measure incorporates all costs that are necessary to be considered forthe design and installation of the heating system, like fan coils for the university premises, radiatorsfor restrooms, chiller, air conditioners, axial ventilators pipes, valves, manometers, filters and otherequipment as well as pipe insulation materials that are considered for the project. Calculations doneby ENSI Key Number Program show that the capacity of the boiler should be about 186 kW.Calculation of savings (by the ENSI ® Key Number Software or other tool)Investments needed for the installation of the heating system according to specification include thefollowing costs: 40830 GEL for 60 fan coil units, 13260 GEL for plastic pipes, other costs identifiedas 3570 GEL are associated with the costs of radiator valves, other pipe-shaped components, aswell as costs for radiators that should be installed in restrooms.The main investment costs associated with the installation of a ventilation/air conditioning systeminclude the costs of axial ventilators, chiller, linear meters of steel pipes, pipe-shaped components,etc. for the indoor space. These costs, based on the developed project of a heating/ventilation andconditioning system, constitute: 220510 GEL.Investment costs for the whole space heating combined with ventilation/air conditioning system willconstitute 278170 GEL, of which 57660 GEL exactly constitutes the investment cost of the heatingsystem. Overheads on investment cost, transportation cost, outgoings as well as value added taxraise the initial investment cost of the project to the total number calculated as: 417640 GEL.Taking into consideration the fact that the Georgian Technical University decided to refurbish the #9building and set up a large computer center there with the purpose of improving the educationalprocess, a social aspect of this measure has to be taken into consideration in monetarizing thevalues for savings calculation. In our calculations the social aspect value has been assessed andmonetarized as equal to 40220 GEL.With the installation of a new central heating system the total amount of saved energy presents adifference between the amounts of the baseline condition as well as the after ENCON measurescondition, and has been identified from the Key Number Software Program as 83651 kWh/y.The real cost of hea, taking into consideration the caloric value, will constitute:0.51/(9.36x0.9) = 0.0605 GEL/kWhThe savings from energy in terms of money will be: 83651 x 0.0605 = 5061 GEL.Total savings will constitute: 40220 + 5061 = 45281 GELInstallation costs will constitute: 10480 GELInvestment:Design/Planning - GELProject Management 1000 GELComponents for heating system 417640 GELInstallation 10480 GELControl and testing 273 GELAs-built documentation 300 GELOther expenses 500 GELTotal investment430193 GELO&M expenses per year (+/-) 500 GEL /yearNet savings44781 GEL /yearEconomic lifetime 15 Years16


Measure2. – Installation of double glazed metal plastic windowsExisting situation - Currently single glazed wooden framed windows are installed in the #9 GTUbuilding Building. The existing window condition is not acceptable.Description of measureAs it was already mentioned, the university administration made the decision to refurbish the #9building and set up a large-scale computer center in it. With these major refurbishments in theuniversity building, high energy efficiency levels can be reached. The installation of new doubleglazed windows is one of the main energy efficiency measures that aims at the reduction of heatlosses in the building. The energy audit team made the decision to suggest the installation of newmetal plastic windows with double glazing in the above building.Calculation of savings (by the ENSI ® Key Number Software or other tool)Total window area constitutes F= 616 m 2 . The price for one m 2 of metal plastic window product withinstallation constitutes about 130 GEL. Accordingly the total investment price will constitute: 80080GEL. The amount of saved energy identified by the Software Key Number program for windowimprovement component has been identified as 111851 kWh/y.In monetary terms this savings will constitute: 111851 x 0.0605 = 6767GEL.Investment:Design/Planning0 GELProject Management100 GELComponents of window products withInstallation80 080 GELControl and testing100 GELAs-built documentation50 GELOther expenses50 GELTotal investment80380 GELO&M expenses per year (+/-)0 GEL /yearNet savings6767 GEL /yearEconomic lifetime20 yearsMeasure3. – Insulation of roofExisting situation - The roof of the #9 GTU building is flat and in poor condition.The energy audit team suggested insulating the roof of the #9 GTU building.Description of measureTo reduce heat losses in the building the energy audit team made the decision to insulate the roofwith mineral/rock wool insulation material.Calculation of savings (by the ENSI ® Key Number Software or other tool)Roof insulation has been considered with construction materials that are given in the direction frombottom to top starting from reinforced concrete slab:-waterproofing layer-glass wool blanket -σ=0.05m, λ=0.04 W/m 0 C-waterproofing layer-cement sand covering σ= 0.03m λ=0.93 W/m 0 C-waterproofing layerThe price of mineral wool on the Georgian market is about 3.7 GEL/m 2 , thus the whole price will be3.7 x 1030 = 3811 GEL. The cement-sand covering for σ= 0.03 m layer will constitute about 5.5GEL/m 2 according to prices of cement and sand on the Georgian construction market as well as theratio of the suggested mixed product that foresees 4 volumes of sand to be mixed with 1 volume ofcement. Implementation of this action arrives to the number: 5.5 x 1030 = 5665 GEL.The price of the waterproofing layer on the Georgian market constitutes 1.5 GEL per m 2 . The roofinsulation foresees 3 layers of waterproofing material, thus the price will constitute: 1.5 x 3 x 1030 =4635 GEL.Total investment cost will be: 3811 + 5665 + 4635 = 14111GEL17


The installation cost for roof insulation will constitute about 6 GEL/m 2 or the total insulationinstallation cost will be: 1030 x 6 = 6180 GELThe amount of saved energy identified by the Key Numbers Software program for roof componentis: 65990 kWh/y. In monetary terms this savings can be presented as: 65990 x 0.0605 = 3992 GEL.Investment:Design/PlanningProject ManagementComponents for roof insulationInstallationControl and testingAs-built documentationOther expensesTotal investmentO&M expenses per year (+/-)Net savingsEconomic lifetime0 GEL100 GEL14111 GEL6180 GEL100 GEL50 GEL50 GEL20591 GELGEL /year3992 GEL /year15 YearsMeasure 4. – Renovation of lighting systemExisting situation -It should be noted that after the disintegration of the USSR the central heatingsystem was not functioning in the building, and during all this period the electricity was used forinefficient space heating, thus the wiring turned to be in a poor condition. The universityadministration made a decision to renovate the lighting system in the #9 GTU building.As of today in the #9 GTU building still remains partly in old wiring, 20 incandescent bulbs as well as387 fluorescent bulbs, electric outlets, switches, as well as cables that should be replaced by newones. This measure is especially important since it is known that the remaining poor wiring results inburned out lamps and their reduced life.Description of measuresThe energy audit team decided to propose a partial renovation of the lighting system in the #9 GTUbuilding, as a measure that should be implemented for achieving comfortable conditions. The energyaudit team during site inspections realized that the poor wiring as well as insufficient amount ofinstalled fluorescent bulbs result in frequent burnouts or dimming due to improper ballast operation.This situation results in increased maintenance costs for GTU, but money actually is wasted,because the remaining old part of the lighting system can’t be restored, but should be replaced by anew efficient one.Calculation of savings (by ENSI ® Key Number Software or other tool)The amount of energy that can be saved in the case of installing a new lighting system was identifiedby the software program. The amount of saved energy identified by the ENSI Software programconstitutes: 5387 kWh/y. In money terms this gives us: 5387 x 0.14889 = 803 GEL.Taking into consideration the fact that fluorescent bulbs due to the already mentioned reasons burnout very quickly, at least several times per year and other parts of the lighting system are alsoimproperly functioning, having a negative impact on the whole lighting system, the savings fromrenovating the existing inefficient part of the system in the building to achieve a comfortableillumination level may be considerable - up to 3000 GEL. The total savings thus constitutes: 3000 +803 = 3803 GELThe investment needed for the partial replacement of the lighting system with an efficient one areidentified as follows:363 electric outlets (10 GEL/unit) -3630 GEL76 switches (6 GEL/unit) - 456 GEL18


DistrictHeatingElectricityGasOilOther407 fluorescent bulbs with fixture sets including ballasts and starters (10 GEL/unit) - 4070 GEL1434 m cable d=(2x4)mm 2 (1.8 GEL/m) = 2581 GELTotal investment constitutes 10737 GELInstallation costs will be at average about 3000 GELInvestment:Design/Planning 0 GELProject Management 200 GELComponents of the lighting system 10737 GELInstallation 3000 GELControl and testing 100 GELAs-built documentation 50 GELOther expenses 50 GELTotal investment 14137 GELO&M expenses per year (+/-) 0 GEL/yearNet savings 3803 GEL/yearEconomic lifetime 5 Years9 Environmental BenefitsThe CO 2 emission coefficient for natural gas in kg/kWh is converted based on the emissioncoefficient 1.89 t Co 2 /1000m3. The calculated savings in delivered energy and related reductions inCO 2 emissions for area - F= 2875m 2 occupied by the #9 Building are as follows:Energy CarrierPresent Situation – baseline (kWh/m²a) na 40.6 153.0 n/a naAfter EE and renovation measures (kWh/m²a) na 36.1 64.7 n/a n/aSavings (kWh/m²a) na 4.5 88.3 n/a n/aSavings (kWh/a) na 12 997 253 882 na naCO 2 emission coefficients (kg/kWh) na 0.3999 0.202 n/a n/aCO 2 emission reductions (kg/m²a) na 1.7955 17.8366 n/a n/aCO 2 emission reductions (t/year) 56.442Installation of a modern heating system with a gas boiler is expected. In the row “PresentSituation” the energy consumption per m 2 of the building without implementation of ENCON (EnergyConservation) measures is provided. Expected savings in gas (m 3 ) are given per m 2 of the buildingarea. The reduction of CO 2 emissions achieved by implementation of all energy efficiency measuresidentified through the energy audit is estimated as 56.442 tons/year.4.5 x 0.3999 = 1.7955 (kg/m 2 a)88.3 x 0.202 = 17.8366 (kg/m 2 a)1.7955 + 17.8366 = 19.6321 (kg/m 2 a)19.6321 x 2875 = 56.442 (t/year)19


Photo materials of the existing situation in the #9 GTU buildingAppendix A20

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