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In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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Study on Passive Heating Involving Firewalls with an Additional Sunlight Room in Rural Residential Buildings.

Simin Yang1, Bart Dewancker1, Shuo Chen1

  • 1Faculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu 808-0135, Japan.

International Journal of Environmental Research and Public Health
|November 13, 2021
PubMed
Summary

This study introduces an innovative firewall-sunlight heating system for rural residences in Southern Shaanxi, significantly reducing annual heat load by up to 20.21%. The system enhances energy efficiency by combining cooking heat with solar energy for prolonged, continuous heating.

Keywords:
firewall–additional sunlight systempassive heatingrural residential buildingssoftware analysissouthern Shaanxi

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Area of Science:

  • Building Energy Efficiency
  • Renewable Energy Integration
  • Sustainable Architecture

Background:

  • Rural residential buildings in China account for 24% of national energy demand, necessitating energy-saving designs.
  • Traditional heating methods are often insufficient, leading to discomfort and high energy consumption.

Purpose of the Study:

  • To develop and evaluate an energy-saving heating system for traditional rural residences in Southern Shaanxi.
  • To improve indoor heating efficiency and prolong heating duration by integrating cooking heat and solar energy.

Main Methods:

  • A novel firewall-sunlight heating system was designed, combining a firewall utilizing cooking heat with an additional sunlight room for solar energy absorption.
  • A simulation model of a typical Southern Shaanxi residence was created using ANSYS software.
  • The system's performance was analyzed under conditions with and without solar radiation on the walls.

Main Results:

  • The firewall-sunlight system effectively extends heating time and meets continuous heating demands.
  • Simulations showed a 20.21% annual heat load reduction when walls received solar radiation, and 8.56% when they did not.
  • The combined system outperformed the firewall heating system alone.

Conclusions:

  • The firewall-sunlight system offers a viable solution for enhancing energy efficiency in rural residences.
  • This integrated approach addresses the limitations of intermittent heating and improves overall building thermal performance.
  • The system demonstrates significant potential for reducing energy consumption and heat load in traditional rural housing.