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2 Journal of New Technologies in Environmental Science

2 2017

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Determination of shortcuts in ventilation units with energy recovery

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Deshko V. , Sukhodub I. , Phuc N. V.

2017

tom Vol. 1, nr 3

113--119

The need to organize air exchange by means of mechanical ventilation is a crucial issue in air-tight buildings, especially in terms of air quality. The use of supply and exhaust ventilation system with heat recovery allows to reduce the cost of supply air heating and cooling. Plate recuperative heat exchangers are often used in small decentralized ventilation systems, having a sufficiently high efficiency. However, unintended air flows inside the unit may lead to a decrease in both the quality of supply air, and recovery effectiveness. The most popular methods for air leakages and shortcuts determination are pressure and tracer gas techniques. Analysis of air flow in ventilation systems with heat recovery can be performed using the method of measuring tracer gas concentration in certain points of the air-handling unit (AHU) [1, 2]. Theoretical and experimental study of such systems can be found in reference [3]. You can also find results of field study of volume flow unbalances and shortcuts in centralized and decentralized ventilation system [4, 5]. Internal shortcuts definition in AHU with plate heat exchangers was conducted using measurements of mass air flow rate in supply and exhaust channels, air inlet and outlet temperatures in heat exchanger and unit and appropriate air energy and mass balances [6, 7].

Mathematical models for determination of energy need for heating

100%

Deshko V. , Sukhodub I. , Bilous I.

2017

tom Vol. 1, nr 2

45--51

One of the key indicators that characterize efficient energy use for heating purpose is the specific value per unit area and/or volume. This paper is devoted to the study of various methods application features used to determine energy need for heating, which there are a large number [1]. Determination of energy need for heating based on experimental data has a number of approximations and inaccuracies, so it is advisable to establish the annual energy need for buildings based on the calculated approaches. Addressing these challenges requires the use of calculation methods and mathematical models. Till the recent years, the methods for determining energy consumption and energy efficiency assessment in Ukraine took into account only annual energy consumption for heating and did not take into account the need for cooling and hot water supply [2, 3]. According to standard [2], the building energy efficiency should be determined on the basis of calculated or actual annual energy consumption for heating needs, while ensuring appropriate sanitary and hygienic norms in the building spaces.