Kęstutis Čiuprinskas

CORRECTION OF A DESIGNED BUILDING'S HEAT BALANCE ACCORDING TO ITS REAL HEAT CONSUMPTION

Abstract One of the most important issues in the implementation of energy saving measures is a proper evaluation of possible energy savings. If energy savings are overestimated in an energy audit (EA), a situation may occur where after the renovation, the implemented energy saving measures is not paid back or their pay back time is longer than expected before the funds (mostly loaned) were invested. To avoid such a situation, the procedure of a buildings energy audit should involve the correction of calculated heat balance according to its real heat consumption, recalculated to the nonnative conditions. In manipulating different building parameters of not exact meanings, it is necessary to attain that the buildings heat demand before renovation (theoretically calculated by the same methodology and parameters as demand after renovation) would be as close as possible to the actual heat consumption, recalculated under normative conditions. Only after such a fitting of the actual and theoretical heat demand...

The Analysis of Balancing Water Cooling Systems and Making Management Decisions Regarding Office Buildings

The paper analyses a cooling system installed using 268 fan coils and having an area of 7900 m in a public building situated in Vilnius city. A comparison between a constant flow system having three way valves, a variable flow system having manually balanced valves and a variable flow system having automatically balanced control valves is made. The analysis has been performed to find out initial investments, installation costs and operating costs during 10 year period. Calculation has showed advantages of the variable flow. The overall cost of the system having manually balanced and two way control valves is 20% lower than that of the constant flow system. The overall cost of the system having automatically balanced control valves is 37% lower than that of the constant flow system. The marked differences may increase in case of growth in electricity price.