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Clique Solar, a channel par tner for MNRE, has has indigenously developed andsuccessfully commercialised the ARUN dish a Fresnel Paraboloid Solar concentratorsystem with applications in industrual process heating, comfort cooling, communitycooking and in commercial and residential complexes.

CLIQUE SOLAR

Case Study: Arun Solar Concentrator

System at Mahanand & Chitale Dairy

The rst ARUN system was installedin Mahanand Dairy in Latur, Maha-rashtra in 2006. This system contin-ues to save about 100 to 115 litres of Fur-nace Oil on a clear sunny day, completelyavoiding the ring of the conventionalboiler. In all 12 dishes of Arun (169 sq.meach) save an equivalent of about 1500barrels of oil per day.

Case Study ARUN installations

in Dairy IndustryAfter studying the various requirementsand constraints of the dairy industry, and

understanding how these can be techno-logically and economically met by harness-ing solar energy, Clique Solar concludedthat the use of solar thermal concentratingsystems for all their thermal requirementsis most suitable. The steam or pressurisedhot water generated by the ARUN dishes isused in the following processes: Pasteurization (160C to 180C) Milk Powder Can Washing (40C to 45C) Cleaning in Place (40C to 45C) Crate washing (40C to 45C) Sterilization (120C to 160C)

ARUN InstallationARUN INSTALLATION AT B.G. C HITALE, S ANGLI - Atwo-dish ARUN system at Chitale Dairy inSangli generates steam which is used forPasteurization, Can washing, cleaning inPlace (CIP) and Crate washing. Both theseARUN dishes are installed on the terraceof its 3-storeyed building. The footprintarea is less than 3m x 3m per dish. The civilengineering and integration challengeswere innovatively handled by Clique So-

lars mutli-faceted engineering team. TheARUN dish tracks the sun on two axes.Water circulates through the receiver coil

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2 JANUARY|FEBRUARY12 energetica india

Location Sangli, Maharashtra

Application Steam generation for Milk processingDelivery Up to 5 bar and 152CCapacity 80-100 kWth per dishDish numbers 2 dishesAperture Area 169X2 = 338 m 2

Location Latur, Maharashtra

Application Pressurized Hot water for Milk processingDelivery Up to 18 bar and 180CCapacity 80-100 kWth per dishDish numbers 1 dishAperture Area 160m 2

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which is placed at the focus of dish trans-ferring the thermal energy from the sun tothe circulating water and converting it topressurized steam up to 152C & 5 bar.

ARUN INSTALLATION AT M AHANAND D AIRY - AtMahanand dairy, a single dish is operation-al for hot water generation for milk pas-teurization. The system pressure and tem-perature is 18 bar and 180C respectively.Due to a mismatch in the working hours ofthe plant and availability of sun, an insu-lated pressurized water storage tank withcapacity of 5000 liters has been providedfor non-solar hours operation. Pressurizedwater was selected as the medium of heat

transfer and storage as it has high specicheat, no re hazards, no possibility of ac-celerated oxidization overnight (as in caseof tarring of thermic oil), compatibility withfood products and low operational cost.

Flow of operation (case study ofChitale Dairy installation)Construction and Operation: Solar Steam Generation system has

been integrated such that the steamseparator acts as both steam accumu-

lator and buffer water storage. At the start of the day, circulating pump

extracts water from steam separator ves-sel & circulates it through receiver coil.

The water is then converted to wetsteam. Thus both, the temperature andpressure, of the uid in the separatorbegin to rise

The steam delivery starts from the topof steam separator as soon as the re-quired steam delivery pressure (5 bar,152C) is achieved.

The dry saturated steam delivered by thesystem is collected in the common headerfor milk processing & other application.

At Mahanad dairy, a pressurized hotwater based system at 18 bar, 180C has

been designed to accommodate thermalstorage requirement.

EconomicsFrom an economic perspective, solar sys-tems are similar to infrastructure projectswhich are characterized by long life, highcapital cost and low running expenses. Assuch, the Life cycle cost of the system, orparameters like Net Present Value (NPV)or Internal Rate of Return (IRR) should be

used to evaluate the investment in suchsystems. A typical cash ow of an ARUNproject has been presented in the table.

The government subsidy, coupledwith the accelerated depreciation help inmaking the equity cash ows positive fromthe second year itself.

Some key Features of theseinstallations are: Small Footprint Area & Retrots: The

small footprint area of ARUN dish (3m

x 3m per dish) enables it to be mountedat locations which have space limita-tions. It can also be erected on rooftopsof existing buildings.

High Temperature & Pressure Delivery:

ARUN can operate up to 400C (oil)and 25 bar (steam).

Government Subsidy: MNRE providessupport by way of capital subsidy or softloans for every ARUN installation.

Non-Solar Hours Operations: ARUN dish can be augmented with a heatenergy storage facility for operation innon-solar hours.

IBR Approval: ARUN is the rst IBR ap-proved Solar Boiler in India.

High Wind Bearing Capacity: ARUN

dish is designed to operate in windspeeds up to 10 m/s and it can survivein wind speeds up to 45 m/s.

Concluding RemarksMahanand and Chitale dairies have setan example by pioneering the success-ful use of solar technology for satisfyingtheir thermal energy needs in various ap-plications like pasteurization; can wash-ing, crate washing and CIP. Not only have

the systems been operating successfully,but the economics of the investment alsomakes a strong case for all industries ingeneral, and dairies in particular, to installsuch systems.

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Yea r 0 Year 1 Year 2 Year 3 Yea r 4 Yea r 5 Yea r 6 Year 7 Year 25

Investment in ARUN system -50Capital Subsidy 10Loan 28

Annual Fuel Savings (derated) 9.0 9.9 10.9 12.0 13.2 14.5 15.9 O&M expense 0.0 -1.0 -1.1 -1.2 -1.3 -1.5 -1.6 Debt Repayment -5.6 -5.6 -5.6 -5.6 -5.6 0.0 0.0 Interest Expense @ 15% -4.2 -3.4 -2.5 -1.7 -0.8 0.0 0.0 Tax saved due to Accelerated Depreciation 10.9 2.2 0.4 0.1 0.0 0.0 0.0 0.0 Net Eqyuity Cash Flow -1.1 1.4 0.4 1.8 3.5 5.4 13.0 14.3

Flow of operation.