scholarly journals An Assessment of Heating Load Reduction by a Solar Air Heater in a Residential Passive Ventilation System

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7651
Author(s):  
Junichiro Matsunaga ◽  
Koki Kikuta ◽  
Hideki Hirakawa ◽  
Keita Mizuno ◽  
Masaki Tajima ◽  
...  
Keyword(s):  
Ventilation System ◽  
Prediction Methods ◽  
Solar Air Heater ◽  
Load Reduction ◽  
Accurate Evaluation ◽  
Air Heater ◽  
Simulation Based ◽  
Measurement Results ◽  
Heating Load ◽  
Simulation Results

In this paper, the authors examined the technology to maximize the use of renewable energy. Passive ventilation systems are expected to reduce the energy consumption of the fan and the maintenance burden. In addition, the wall-mounted solar air heater can supply thermal energy without using any energy at all. Therefore, this paper presents a “passive ventilation system with a solar air heater” that combines a passive ventilation system with the solar air heater to preheat the air. This system can reduce the ventilation load. To evaluate the solar air heater performance in a real environment, we developed a simulation for calculating the heat collection capacity of the solar air heater, and then the system was implemented in a real building for verification. The simulation performs hourly unsteady calculations, allowing for accurate evaluation of the annual simulation. Based on the measurement results, the effects of heating load reduction and prediction methods are presented. The solar air heater reduced the monthly ventilation load by up to 50% or more, and by at least 15%. It was also confirmed that there was a high correlation between the actual measurements and the simulation results.

scholarly journals An Assessment of Heating Load Reduction by Solar Air Heater in Residential Passive Ventilation System

2021 ◽  
Author(s):  
Junichiro Matsunaga ◽  
Koki Kikuta ◽  
Hideki Hirakawa ◽  
Keita Mizuno ◽  
Masaki Tajima ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Ventilation System ◽  
Prediction Methods ◽  
Solar Air Heater ◽  
Load Reduction ◽  
Air Heater ◽  
Air Supply ◽  
Measurement Results ◽  
Heating Load ◽  
Real Building

This paper, we examined the technology to maximize the use of renewable energy. The passive ventilation system is expected to reduce the energy consumption of the fan power and the maintenance burden. In addition, the wall-mounted solar air heater can supply thermal energy without using any energy at all. Therefore, we propose a "passive ventilation system with a solar air heater" that combines a passive ventilation system with solar air heater to preheat the air supply and reduce the ventilation load. To evaluate the solar air heater performance in a real environment, we developed a simulation for calculating the heat collection capacity of the solar air heater, and then implemented the system in a real building for verification. Based on the measurement results, the effects of heating load reduction and prediction methods are presented.

scholarly journals Numerical Simulation-Based Investigation of the Limits of Different Quasistatic Models

2021 ◽  
Vol 11 (23) ◽  
pp. 11218
Author(s):  
Houssein Taha ◽  
Zuqi Tang ◽  
Thomas Henneron ◽  
Yvonnick Le Menach ◽  
Florentin Salomez ◽  
...  
Keyword(s):  
Radiation Effects ◽  
Low Frequency ◽  
Power Converter ◽  
Electromagnetic Devices ◽  
Field Distributions ◽  
Simulation Based ◽  
Measurement Results ◽  
Inductive Effects ◽  
Simulation Results ◽  
Good Agreement

The modeling of the capacitive phenomena, including the inductive effects becomes critical, especially in the case of a power converter with high switching frequencies, supplying an electrical device. At a low frequency, the electro-quasistatic (EQS) model is widely used to study the coupled resistive-capacitive effects, while the magneto-quasistatic (MQS) model is used to describe the coupled resistive-inductive effects. When the frequency increases, the Darwin model is preferred, which is able to capture the coupled resistive-capacitive-inductive effects by neglecting the radiation effects. In this work, we are interested in specifying the limits of these models, by investigating the influence of the frequency on the electromagnetic field distributions and the impedance of electromagnetic devices. Two different examples are carried out. For the first one, to validate the Darwin model, the measurement results are provided for comparison with the simulation results, which shows a good agreement. For the second one, the simulation results from three different models are compared, for both the local field distributions and the global impedances. It is shown that the EQS model can be used as an indicator to know at which frequency the Darwin model should be applied.

scholarly journals Feasibility of a Passive Ventilation System with a Thermal Damper - Simulations and measurement results of an experimental house in a mild region of Japan -

2019 ◽  
Vol 111 ◽  
pp. 06047
Author(s):  
Motoya Hayashi ◽  
Hoon kim ◽  
Yoshinori Honma ◽  
Junichiro Matsunaga
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Ventilation System ◽  
Indoor Environments ◽  
Air Supply ◽  
Measurement Results ◽  
Simulation Results ◽  
Ventilation Rates ◽  
Ventilation Systems

In order to retain good indoor air quality through the year in detached houses with passive ventilation systems, the authors investigated a mechanical control air-supply method. Firstly, indoor environments in houses with passive ventilation systems with thermal dampers, were examined using a simulation program (Fresh). Secondly, a passive ventilation system with a thermal damper, an under-floorheating system with a heat pump and were installed in an airtight house at Maebashi in Japan and measurements on its ventilation characteristics and indoor air quality were made. The simulation results showed that if the thermal damper is well tuned, this mechanically controlled air-supply opening keeps ventilation rates adequate through the year especially in airtight houses. The measurement results showed that the ventilation rates were kept above the required level through the year and the TVOC concentration decreases from 3000 to 200 μg/m3 in 5 months after the construction.

scholarly journals Developing of a ventilation system for residential houses with solar air heater

2019 ◽  
Vol 97 ◽  
pp. 06017
Author(s):  
Zohrab Melikyan ◽  
Siranush Egnatosyan ◽  
Naira Egnatosyan
Keyword(s):  
Low Income ◽  
System Analysis ◽  
Low Cost ◽  
Ventilation System ◽  
Climatic Conditions ◽  
Winter Period ◽  
Internal Space ◽  
Solar Air Heater ◽  
Air Heater ◽  
Quantity Of Heat

Ventilation of buildings in winter period, especially in cold climatic conditions, requires rather big quantity of heat for preheating the ventilation fresh air. Consequently, an average low-income family pays a tangible cost for ventilation of apartments. To provide low cost ventilation of houses it is becoming attractive the use of solar energy for preheating the outside fresh air, before its supplying into the house. For this purpose, cheap solar air heaters are needed. To solve this problem a simple and cheap construction of solar air heater was developed, which is the main part of the ventilation system. The system consists of air heating solar collectors, installed on the roof of the house, warm air distribution ductwork, internal air circulation ducts and air-circulating fan. In summer period, the system is used only during nighttime period for circulating outside colder air through the internal space of the house. Such operation allows cooling internal air and as well the constructions of the house. As a result, the house accumulates nighttime natural cold for using it at daytime cooling purposes. Presentation includes the scheme, explanation of operation and method for design of suggested ventilation system. Analysis proved the energy efficiency and cost effectiveness of the new system.

PERFORMANCE ANALYSIS OF DOUBLE PASS COUNTER FLOW SOLAR AIR HEATER FOR DRYING APPLICATION

2018 ◽  
Author(s):  
D.V.N. Lakshmi ◽  
Palanisamy Muthukumar ◽  
Dr.Apurba Layek ◽  
Abhimanyu Kumar Singh ◽  
Sushoban Das
Keyword(s):  
Performance Analysis ◽  
Solar Air Heater ◽  
Double Pass ◽  
Counter Flow ◽  
Air Heater

Thermal Performance Analysis of a Rectangular Longitudinal Finned Solar Air Heater With Semicircular Absorber Plate

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Satyender Singh ◽  
Prashant Dhiman
Keyword(s):  
Thermal Performance ◽  
Numerical Solutions ◽  
Solar Air Heater ◽  
Duct Flow ◽  
Balance Equations ◽  
Absorber Plate ◽  
Ansys Fluent ◽  
Air Heater ◽  
Glass Cover ◽  
Good Agreement

Thermal performance of a single-pass single-glass cover solar air heater consisting of semicircular absorber plate finned with rectangular longitudinal fins is investigated. The analysis is carried out for different hydraulic diameters, which were obtained by varying the diameter of the duct from 0.3–0.5 m. One to five numbers of fins are considered. Reynolds number ranges from 1600–4300. Analytical solutions for energy balance equations of different elements and duct flow of the solar air heater are presented; results are compared with finite-volume methodology based numerical solutions obtained from ansys fluent commercial software, and a fairly good agreement is achieved. Moreover, analysis is extended to check the effect of double-glass cover and the recycle of the exiting air. Results revealed that the use of double-glass cover and recycle operation improves the thermal performance of solar air heater.

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