Abstract
Heat recovery from ventilation air is proven technology resulting in significant energy savings in modern buildings. The article presents an energy analysis of an air handling unit with a cross-flow heat exchanger in an office building in Poland. Measurements were taken during one year of operation, from 1 August 15 to 31 July 16, covering both heating and cooling periods. Calculated annual temperature efficiency of heat and cold recovery amounted to 65.2% and 64.6%, respectively, compared to the value of 59.5% quoted by the manufacturer. Monthly efficiency of heat recovery was from 37.6% in August to 68.7% in November, with 63.9% on average compared to 59.5% declared by the manufacturer. Cold recovery was from 63.3% in April to 72.8% in September, with 68.1% annually. Calculated recovered heat and cold amounted 25.6 MWh and 0.26 MWh, respectively. Net energy savings varied from −0.46 kWh/m2 in August, when consumption by fans exceeded savings, to 5.60 kWh/m2 in January.
Highlights
Buildings in Europe are responsible for about 40% of total energy consumption [1], having significant impact on economies of European countries
The Regulation of the Minister of Infrastructure and Development on the methodology to determine the energy performance of a building and energy performance certificates [6] presents in detail the calculation procedure to obtain energy performance indicators: EP, EK, and EU
VOenpteilraattioionnAoirffltohwe analyzed air handling unit (AHU) is strictly dependent on working hours of a building
Summary
Buildings in Europe are responsible for about 40% of total energy consumption [1], having significant impact on economies of European countries. The Regulation of the Minister of Infrastructure and Development on the methodology to determine the energy performance of a building and energy performance certificates [6] presents in detail the calculation procedure to obtain energy performance indicators: EP (nonrenewable primary energy), EK (final energy), and EU (usable energy) This procedure has been presented by several authors recently [7,8,9,10,11,12,13,14,15]. The base to obtain EP, EK, and EU is calculated annual energy use for space heating; cooling; ventilation; domestic hot water (DHW); and, in nonresidential buildings, lighting These factors include energy directly utilized to provide a given service and consumed by an additional equipment necessary for the operation of the technical systems in the building as well
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