Ventilation systems with local recirculation diffusers

Naumov, Alexander L.; Kapko, Dmitry V.; Brodach, M.M.

doi:10.1016/j.enbuild.2014.09.050

Cited by 8 publications

(5 citation statements)

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“…The building passport for energy efficiency (BEP) and rational use of material resources is a special documentcertificate that contains information about the geometric and technical parameters of the building, its functional purpose, design solutions, thermal characteristics, and energy performance (Figure 3, Virta et al, 2012). The composition and content of the energy passport of the building are given in the paper of Naumov & Kapko, 2015. The BEP is compiled based on the results of an energy inspection to assess the efficiency of consumed energy and material resources and contains recommendations for the use of energy-saving procedures and information on the building efficiency class.…”

Section: Figure 2 Building Life Cycle Stages and Their Percentages Of...mentioning

confidence: 99%

Building Energy Passportization in Azerbaijan

Akbarova

2023

AAES

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The operating energy costs of buildings account for approximately 70-80% of the total costs throughout the entire life cycle of a building. From the moment putting the building into operation, it begins to consume energy, mechanical, electrical, and natural resources. In buildings, all construction and technical systems naturally degrade over time, both in terms of performance and efficiency, i.e. operating and maintenance building costs are rising, energy consumption is increasing, and microclimate quality is declining. As a solution to this issue, it is possible to consider building energy passport, as a tool to control the optimal building operation according to the indicators of the building passport and as an encouragement way of cities' sustainability. The building passport by its energy efficiency (BEP) and rational use of material resources is a special document- a certificate that contains information about the geometric and technical parameters of the building, its functional purpose, design solutions, thermal characteristics, and energy performance. This paper discusses the current state of the building passportization process in Azerbaijan, and analyzes the existing shortcomings. Categories and component parts of BEP, types and levels of building information and data, scheme of inputs and extractions data during the building life cycle, key tasks of BEP, and strategic actions for the successful development of BEP are given. Building energy efficiency rating classes are calculated, and the main procedures to enhance the energy efficiency class are given. The requirements for experts who carry out the buildings` passportization are systematized.

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Section: Figure 2 Building Life Cycle Stages and Their Percentages Of...mentioning

confidence: 99%

Building Energy Passportization in Azerbaijan

Akbarova

2023

AAES

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“…In comparison to the supply grille, fabric diffusers were able to provide a relatively regular velocity and temperature distribution for most areas in the room as well as more comfortable thermal conditions in the room. Currently, design solutions are being developed for supply air diffusers, which reduce energy consumption, e.g., supply air diffusers with recirculation [15]. They use local heat gains in the room to heat up the supply air.…”

Section: Figurementioning

confidence: 99%

Airflow Fluctuation from Linear Diffusers in an Office Building: The Thermal Comfort Analysis

et al. 2021

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In buildings, the HVAC systems are responsible for a major part of the energy consumption. Incorrect design or selection of the system and improper installation, operation, and maintenance of the systems’ elements may result in increased energy consumption. It is worth remembering that the main aim of the appropriate system is to maintain the high quality of the indoor environment. Appropriate selection of the HVAC solution ensures both thermal and quality parameters of the air, independently of the internal and external heat loads. The microclimate of a room is affected not only by air temperature, humidity, and purity, but also by air velocity in the occupied zone. The proper air velocity distribution prevents discomfort, particularly at workstations. Based on the measurements in the office building, an analysis of velocity profiles of air supplying two different types of linear diffusers was carried out. The analysis was made based on the results of measurements performed with thermoanemometers in the actual facility. During the study, temperature of the supply air was lower that the air in the room. Analysis was focused on the airflow fluctuation and its impact on the users’ comfort. This is an obvious topic but extremely rarely mentioned in publications related to air diffusers. The results show the importance of air fluctuation and its influence on the users’ comfort. During the measurements, the instantaneous air velocity for one of the analyzed types of the diffuser was up to 0.34 m/s, while the average value from the period of 240 s for the same measuring point was relatively low: it was 0.19 m/s. Only including the airflow variability over time allowed for choosing the type of diffuser, which ensures the comfort of users. The measurements carried out for two linear diffusers showed differences in the operation of these diffusers. The velocity in the occupied zone was much higher for one type (0.36 m/s, 3.00 m from diffusers) than for another one (0.22 m/s, 5.00 m from diffusers). The improper selection of the diffuser’s type and its location may increase the risk of the draft in the occupied zone.

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“…For example, the current building energy codes and standards have been striving to improve energy efficiency and ultimately achieve zero energy buildings [ 18 , [24] , [25] , [26] ]. Thus, energy conservation measures, such as air recirculation [ 27 , 28 ] and heat recovery [ [29] , [30] , [31] ] in HVAC systems, were preferred to be investigated in previous literature. However, in the current perspective, HVAC systems may increase the chances of SARS-CoV-2 infection to occupants in buildings due to insufficient ventilation or no indoor airflow controls in extreme situations such as a pandemic.…”

Section: Literature Reviewmentioning

confidence: 99%