scholarly journals Yearly Heat Loss Analysis of a Heat Recovery Ventilator Unit for a Single-Family House in St. John’s, NL, Canada

2019 ◽  
Vol 3 (5) ◽  
Author(s):  
Rabbani Rasha ◽  
M. Tariq Iqbal
Keyword(s):  
Energy Consumption ◽  
Heat Loss ◽  
Heat Recovery ◽  
Ventilation System ◽  
Single Family ◽  
Loss Analysis ◽  
Increase Energy Efficiency ◽  
Electricity Cost ◽  
Air Infiltration ◽  
Detached House

This paper represents an energy consumption and heat loss analysis of a heat recovery ventilator unit in a single-family detached house in St. John’s, NL, Canada. An energy-efficient house is a growing attraction to control the air infiltration, provide a comfortable environment with reduced yearly electricity cost. A mechanical induced ventilation system is inevitable to increase energy efficiency and to reduce greenhouse gas emissions of the house in order to supply fresh air. A heat recovery ventilator (HRV) is an air to air heat exchangers that recovers heat from inside of the house and delivers this preheated and fresh air to the space for maintaining the occupant’s comfort. In this paper, yearly energy consumption with the heat loss of a typical heat recovery ventilator unit is presented. MATLAB, BE opt, and Microsoft Excel are used to do all necessary simulation with calculation using one-year logged data. Methodology, results with graphs and detailed analysis of this research are included in this paper. This research indicates that the cost of running a HRV for a year in a house in St. John’s could be as high as $484 per year with an unknown air quality improvement.

scholarly journals Heat recovery by means of a ventilation unit

2021 ◽  
Vol 263 ◽  
pp. 04025
Author(s):  
Dmitrii Khlopitsyn ◽  
Andrey Rymarov
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Heat Recovery ◽  
New Technologies ◽  
Ventilation System ◽  
New Developments ◽  
Before And After ◽  
Save Energy ◽  
Recuperative Heat Exchanger ◽  
Air Removal

Energy consumption all over the world is constantly growing. To save energy, new technologies are being developed for the efficient use of energy resources. The goal of all new developments is to use less energy to provide the same level of energy supply for technological processes or buildings. The problem of energy saving is relevant for the ventilation system. Together with the removed air, a large amount of heat is lost, which is not advisable. In order to avoid these losses, heat recuperators began to be used, heating the cold supply air due to the warm air removed from the room. This development belongs to the field of energy saving. The goal is to increase efficiency by reheating the air after the heater with the help of a recuperator for a given temperature difference in the supply air before and after the recuperative heat exchanger. The development is a design of a ventilation unit with air removal and supply air ducts, combined into one housing with a separate, according to the “screw” principle, heat transfer wall, for use in the ventilation system in order to ensure an optimal microclimate in the room. Thus, as a result of using the presented device, the efficiency of the room ventilation unit is increased by reducing the energy consumption for heating the supply air with a heater.

scholarly journals House owners’ experience and satisfaction with Danish low-energy houses - focus on ventilation

2019 ◽  
Vol 111 ◽  
pp. 04006
Author(s):  
Henrik N. Knudsen
Keyword(s):  
Energy Consumption ◽  
Air Quality ◽  
High Performance ◽  
Indoor Environment ◽  
Ventilation System ◽  
Low Energy ◽  
Energy Class ◽  
Single Family ◽  
Environment Temperature ◽  
Low Energy Consumption

The purpose of this study was to evaluate house owners’ experience and satisfaction with the first Danish detached low-energy single-family houses, built according to energy class 2015 before these supplementary requirements became standard for all new dwellings. A questionnaire survey was carried out among owners of newly built energy class 2015 houses. The paper presents the house owners answers to questions on their overall satisfaction, their heat consumption, and their satisfaction with the indoor environment (temperature, draught, air quality, noise and daylight). There is a focus on issues related to having a mechanical ventilation system, i.e. satisfaction with the air quality, does the air feel dry in winter, and does the ventilation system make noise and how the airing behaviour is in winter. As many as 370 out of 869 house owners, corresponding to a response rate of 43%, answered the questionnaire. There was an overall satisfaction with the new low-energy houses. More than 90% of the house owners perceived the indoor environment as satisfactory. The energy consumption was as low as expected by 59%, while only 7% answered that it was higher than expected. Compared with previous similar studies, problems with technical installations have decreased. However, there is a need for continued focus on the commissioning of new and not necessarily thoroughly tested, high-performance installations and new designs. Based on the survey a series of recommendations are given that might help to achieve both a low energy consumption and satisfied occupants of new low-energy dwellings.

scholarly journals THE ANALYSIS OF WATER SPEED INFLUENCE IN HOT-WATER DISTRIBUTION SYSTEM ON THE AMOUNT OF HEAT LOSS

2021 ◽  
Vol 2021 (1) ◽  
pp. 23-28
Author(s):  
Peter Kapalo ◽  
◽  
Khrystyna Kozak ◽  
Khrystyna Myroniuk ◽  
◽  
...  
Keyword(s):  
Energy Consumption ◽  
Heat Loss ◽  
Distribution System ◽  
Distribution Systems ◽  
Water Distribution ◽  
Water Distribution System ◽  
Ventilation System ◽  
Hot Water ◽  
Graphical Form ◽  
Hot Water Supply System

One of the main tasks around the world is to reduce energy consumption with constant consumer comfort. The hot water supply system uses a significant part of thermal energy and requires no less attention than the heating or ventilation system. The amount of heat loss from hot water distribution systems is of great importance for the energy consumption of buildings. In winter, part of this heat is used for space heating, in summer they are unused and is considered as lost heat. For this reason, this paper considers the influence of water velocity in the pipe, pipe size, and water temperature on the total heat losses in the insulated hot-water distribution system. The data are presented in tabular and graphical form. A graph of the dependence of the amount of heat loss on the temperature and velocity of hot water is obtained.

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 Research on Best Solution for Improving Indoor Air Quality and Reducing Energy Consumption in a High-Risk Radon Dwelling from Romania

2021 ◽  
Vol 18 (23) ◽  
pp. 12482
Author(s):  
Ion-Costinel Mareș ◽  
Tiberiu Catalina ◽  
Marian-Andrei Istrate ◽  
Alexandra Cucoș ◽  
Tiberius Dicu ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Heat Recovery ◽  
Natural Ventilation ◽  
High Efficiency ◽  
Ventilation System ◽  
Radon Level

The purpose of this article is the assessment of energy efficiency and indoor air quality for a single-family house located in Cluj-Napoca County, Romania. The studied house is meant to be an energy-efficient building with thermal insulation, low U-value windows, and a high efficiency boiler. Increasing the energy efficiency of the house leads to lower indoor air quality, due to lack of natural ventilation. As the experimental campaign regarding indoor air quality revealed, there is a need to find a balance between energy consumption and the quality of the indoor air. To achieve superior indoor air quality, the proposed mitigation systems (decentralized mechanical ventilation with heat recovery combined with a minimally invasive active sub-slab depressurization) have been installed to reduce the high radon level in the dwelling, achieving an energy reduction loss of up to 86%, compared to the traditional natural ventilation of the house. The sub-slab depressurization system was installed in the room with the highest radon level, while the local ventilation system with heat recovery has been installed in the exterior walls of the house. The results have shown significant improvement in the level of radon decreasing the average concentration from 425 to 70 Bq/m 3, respectively the carbon dioxide average of the measurements being around 760 ppm. The thermal comfort improves significantly also, by stabilizing the indoor temperature at 21 °C, without any important fluctuations. The installation of this system has led to higher indoor air quality, with low energy costs and significant energy savings compared to conventional ventilation (by opening windows).

scholarly journals Case Study of Thermal Diagnostics of Single-Family House in Temperate Climate

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4549 ◽  
Author(s):  
Aleksandra Specjał ◽  
Aleksandra Lipczyńska ◽  
Maria Hurnik ◽  
Małgorzata Król ◽  
Agnieszka Palmowska ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Ventilation System ◽  
Energy Performance ◽  
Primary Energy ◽  
Building Envelope ◽  
Hot Water ◽  
Temperate Climate ◽  
Normative Values ◽  
Single Family ◽  
Family House

Reduction of the primary energy consumption is a crucial challenge for the building sector due to economic and environmental issues. Substantial savings could be achieved within the household. In this paper, we investigate the energy performance of a single-family house located in the temperate climate. The assessment is based on the comprehensive thermal diagnostic of the building performed on-site and via computational analyses. The on-site measurements included diagnostics of the building envelope, heat source, heating and domestic hot water system, ventilation system, and indoor environmental quality. Analyses confirmed that the studied building, which was built in 2008, meets the legislation requirements for the primary energy usage at that time and nowadays. However, results show discrepancies between energy performance obtained through on-site measurements and computational methods following regulations. Partially, discrepancies are a result of differences on normative values and how the building is operated in practice. It is also showed how important the role in the assessment of energy consumption through measurements is played by the measurement period.

scholarly journals Utilization of heat recovery ventilation: steady-state two-zone heat loss analysis and field studies

2018 ◽  
Author(s):  
Arnold Janssens ◽  
Wolf Bracke ◽  
Marc Delghust ◽  
Eline Himpe ◽  
Silke Verbruggen ◽  
...  
Keyword(s):  
Steady State ◽  
Heat Loss ◽  
Heat Recovery ◽  
Field Studies ◽  
Loss Analysis

ELECTRICAL POWER GENERATED FROM AN OPERATING DESKTOP COMPUTER THROUGH WASTE HEAT RECOVERY

10.6036/10150 ◽  
2021 ◽  
Vol 96 (4) ◽  
pp. 345-345
Author(s):  
CARLOS ALBERTO GARCIA RODRIGUEZ ◽  
PEDRO QUINTO DIEZ ◽  
JOSE ALFREDO JIMENEZ BERNAL ◽  
IGNACIO CARVAJAL MARISCAL
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Heat Recovery ◽  
Waste Heat ◽  
Electrical Power ◽  
Industrial Sector ◽  
Total Energy Consumption ◽  
Desktop Computer ◽  
Increase Energy Efficiency ◽  
Different Types

Use of heat recovery systems applied to different industries as a technology to increase energy efficiency [1] is becoming more and more common, one third of the total energy consumption is related to the industrial sector, and of this, about fifty percent is wasted as heat [2]. Increasing use of different types of computers forces us to rethink the possibility of improving their energy efficiency and consequently reducing their energy consumption.

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