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ECA NETWORK MEETINGBelgrade, 10-13.05.2011Belgrade, 10-13.05.2011

Round table

Branislav Džinić grad. mech. eng. P.E.

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• INTRODUCTION:

• -Serbian republic covers an area of 88 361 km2

• -It is located in the southeastern partof Europeof Europe

• -Population: 7,6 millions

• -Strong agriculture

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• CLIMATE:

• -In the north: Continental climate (cold winters and hot (cold winters and hot summers)

• -Central part: Continental and mediterranean climate to the south

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Bombons 5,8 %

Chocalate and cocoa based products

30,8%

Fine bakery products Fine bakery products 63,5%

Structure of confectionary products, Chart 3

Confectionary industry: Serbia currently has about 20 major conditory companies with an annual production of 130.000 tons of which 84.000 tons for the domestic market.

This shows that app. 30% of products require strict cooling conditions – chocolate products

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In the process of production, average monthly energy consumption is:

- 600.000 kW of electrical energy- 200.000 nm3 of gas

and :- 9.000 m3 of water- 9.000 m3 of water

Need for cooling in the production process are recorded at the end of March.Ambient temperature during this period favour the use of free cooling.

Slide 6 : The range of mean and absolute monthly maximum temperature in BelgradeReference period is 1971-2000

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Night mode of free cooling allows accumulation and savings as high as 15%This saving is particularly pronounced in manufacturing parts for fine bakery

products, in which the required temperature is about 30oC

In the parts for the production of chocolate products, refrigeration machinery must be used from outside temperatures of 22oC, free cooling night mode can reduce, by accumulation, the need for machinery coolingcan reduce, by accumulation, the need for machinery cooling

Previous measurement shows that the application of free cooling reduce the need for cooling by using of refrigeration device by about 25%.

Reconstruction take into account the quality of building insulation and also the insulation of products line equipment which has dissipation

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Technology required temperature in the production area:

- fine bakery products: 30oC

- chocolate products: 20oC

- storage room: 20oC

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Particular project was done for the plant in Belgrade, with usable area of 2500 m2 and with combined production of chocolate products and fine bakery products.

Capacities, obtained by calculation, was:- for cooling: 620 kW- for heating: 550 kW

Elements used for heating and cooling were fan coil units with the possibility of the free cooling mode.

By using the automation process, we measure the room temperature.Each unit measure the room temperature and humidity.Combining with measurements of outside temperature and humidity, it is determined weather device will work in free cooling mode or not.

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For cooling in summer period, the using of chiller is planned.In July and in August, confectionary manufacturers ussualy have yearly

maintenance works and the use of chiller in that period is reduced.

What can be achieved by introducing free cooling solution?

1. Reducing the number of refrigeration system working hours and also demages. It is important to note that we prepare special project also demages. It is important to note that we prepare special project for monitoring the chiller with daily log.

2. Reducing of energy consumption by using of air with favourable temperature.Energy savings: estimated 288.000 kWh (28.800 EUR) per year, data collections in progress

3. Reduced maintenance costs