Exergy–economic evaluation of heat recovery device in mechanical ventilation system

2015 ◽  
Vol 86 ◽  
pp. 296-304 ◽  
Author(s):  
Tomasz M. Mróz ◽  
Anna Dutka
Keyword(s):  
Mechanical Ventilation ◽  
Economic Evaluation ◽  
Heat Recovery ◽  
Ventilation System

Study of a prototype of an advanced mechanical ventilation system with heat recovery integrated by heat pump

2016 ◽  
Vol 133 ◽  
pp. 111-121 ◽  
Author(s):  
F. Fucci ◽  
C. Perone ◽  
G. La Fianza ◽  
L. Brunetti ◽  
F. Giametta ◽  
...  
Keyword(s):  
Mechanical Ventilation ◽  
Heat Pump ◽  
Heat Recovery ◽  
Ventilation System

scholarly journals An Evaluation of the Performance of a Ground-to-Air Heat Exchanger in Different Ventilation Scenarios in a Single-Family Home in a Climate Characterized by Cold Winters and Hot Summers

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 105
Author(s):  
Aldona Skotnicka-Siepsiak
Keyword(s):  
Mechanical Ventilation ◽  
Energy Efficiency ◽  
Heat Exchanger ◽  
Real World ◽  
Heat Recovery ◽  
Ventilation System ◽  
Single Family ◽  
Heating And Cooling ◽  
Family Home ◽  
Cooling Loads

In the present study, the real-world performance of a ground-to-air heat exchanger (GAHE) was analyzed in the Polish climate which is characterized by warm summers and cold winters. The heat exchanger’s performance was monitored over a period of three years (2017 to 2019), and real-world conditions were compared with a Typical Meteorological Year (TMY). The aim of the study was to assess the exchanger’s energy-efficiency potential in various ventilation scenarios in a single-family home under variable real-world conditions, rather than to simply determine its heating and cooling capacity. The analyzed single-family home was a modern, single-story building with a usable floor area of 115 m2. The building’s thermal insulation and airtightness met stringent energy-efficiency standards. Energy consumption in a building equipped with a natural ventilation system was compared with three other scenarios: ventilation coupled with a GAHE, mechanical ventilation with heat recovery and a high-efficiency heat exchanger (HE), and mechanical ventilation with heat recovery coupled with a GAHE. Sensible heating and cooling loads were calculated based on standard ISO 13790:2008, and latent heating and cooling loads were also included in the energy balance. During the year, the GAHE generated around 257.6 W of heating energy per hour and 124.7 W of cooling energy per hour. Presented results can be used to select the optimal HVAC system scenarios for engineering projects as well as private investors.

scholarly journals Analysis of Mechanical Ventilation System with Heat Recovery in Renovated Apartment Buildings

2015 ◽  
Vol 72 ◽  
pp. 27-33 ◽  
Author(s):  
Edite Kamendere ◽  
Gatis Zogla ◽  
Agris Kamenders ◽  
Janis Ikaunieks ◽  
Claudio Rochas
Keyword(s):  
Mechanical Ventilation ◽  
Heat Recovery ◽  
Ventilation System ◽  
Apartment Buildings

scholarly journals Effect of Mechanical Ventilation on Accidental Hydrogen Releases—Large-Scale Experiments

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3008
Author(s):  
Agnieszka W. Lach ◽  
André V. Gaathaug
Keyword(s):  
Mechanical Ventilation ◽  
Mass Flow ◽  
Large Scale ◽  
Ventilation System ◽  
Hydrogen Gas ◽  
Forced Ventilation ◽  
British Standard ◽  
Confined Spaces ◽  
Series Of Experiments ◽  
Rate Limit

This paper presents a series of experiments on the effectiveness of existing mechanical ventilation systems during accidental hydrogen releases in confined spaces, such as underground garages. The purpose was to find the mass flow rate limit, hence the TPRD diameter limit, that will not require a change in the ventilation system. The experiments were performed in a 40 ft ISO container in Norway, and hydrogen gas was used in all experiments. The forced ventilation system was installed with a standard 315 mm diameter outlet. The ventilation parameters during the investigation were British Standard with 10 ACH and British Standard with 6 ACH. The hydrogen releases were obtained through 0.5 mm and 1 mm nozzles from different hydrogen reservoir pressures. Both types of mass flow, constant and blowdown, were included in the experimental matrix. The analysis of the hydrogen concentration of the created hydrogen cloud in the container shows the influence of the forced ventilation on hydrogen releases, together with TPRD diameter and reservoir pressure. The generated experimental data will be used to validate a CFD model in the next step.

scholarly journals The Required Amount of Ventilation Air for the Classroom and the Possibility of Air Infiltration through the Windows

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7537
Author(s):  
Piotr Lis ◽  
Anna Lis
Keyword(s):  
Mechanical Ventilation ◽  
Urban Population ◽  
Heat Recovery ◽  
Main Issue ◽  
School Buildings ◽  
Air Leakage ◽  
Air Infiltration ◽  
Technical Requirements ◽  
Leakage Coefficient

The majority of education buildings in Poland are equipped with natural (gravity) ventilation, where the air inflow depends on the level of window airtightness. A complete statistical urban population of 50 school buildings in Czestochowa have been examined. The main issue to be clarified is the answer to the following questions: Is it theoretically possible to supply enough air to meet the ventilation requirements with gravity ventilation? What is the airtightness of the windows at which it will be possible? The average technical conditions of windows in the analysed buildings were bad. However, only in the case in which high external air leakage coefficient a = 7.0 m3/(h m daPa2/3) (q100KL = 32.4912 m3/(h m) is the amount of air passing through the leaks similar to the quantitative ventilation requirements for classrooms. The quantity of air flowing from the outside through modernized windows that meet the technical requirements (a = 0.6 to 1.0 m3/(m h daPa2/3)) covers on average only about 12% and about 21% of the ventilation needs. Without installing additional vents in the rooms, or better yet, installing mechanical ventilation with heat recovery, meeting the ventilation norm requirements will be impossible.

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