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Standard Solutions01:14

Standard Solutions

310
Standard solutions refer to solutions with a precisely known concentration or composition. A primary standard is a highly pure, high molar mass, stable substance that is entirely soluble in water, the most commonly used solvent in analytical chemistry. The primary standard solution can be used to standardize secondary standards, which are substances with known concentrations but are less pure and stable. Standard solutions are essential for achieving accurate and reliable results in analytical...
310

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Updated: Jun 28, 2025

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Indoor environmental quality in schools: NOTECH solution vs. standard solution.

Carlo Volf1, Klaus Martiny1, Mathias Andersen2

  • 1NID-Group, Copenhagen University Hospital, Copenhagen, Frederiksberg, 2000, Denmark.

F1000Research
|April 15, 2024
PubMed
Summary
This summary is machine-generated.

The NOTECH ventilation system offers a cost-effective and sustainable alternative to mechanical ventilation in schools. It maintains acceptable indoor environmental quality while significantly reducing costs and carbon footprint.

Keywords:
Natural ventilation – indoor environmental quality (IEQ) – schools – mechanical ventilation – energy performance

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Area of Science:

  • Building Science
  • Environmental Engineering
  • Sustainable Architecture

Background:

  • Poor indoor environmental quality (IEQ) is prevalent in Danish schools due to budget constraints for renovations and mechanical ventilation.
  • Existing schools often face challenges in maintaining adequate indoor environments, impacting occupant health and learning.
  • The study addresses the need for affordable and effective ventilation solutions in educational facilities.

Purpose of the Study:

  • To evaluate the performance of a novel façade-based, demand-controlled ventilation system (NOTECH) in a school renovation.
  • To compare the IEQ and energy performance of the NOTECH system against conventional mechanical ventilation.
  • To assess the cost-effectiveness and environmental impact of the NOTECH solution.

Main Methods:

  • A comparative study was conducted in two identical classrooms at Skovbrynet Skole, Denmark.
  • One classroom was equipped with the NOTECH system, and the other with a conventional mechanical ventilation system.
  • Indoor environmental quality parameters and energy performance were monitored over the 2018-2019 school year.

Main Results:

  • Both ventilation systems maintained CO2 levels below the Danish Building Regulations' limit of 1000 ppm.
  • The NOTECH system demonstrated significantly lower overall costs, estimated at 35% of the mechanical system's costs, including installation, heating, electricity, and maintenance.
  • The NOTECH solution exhibited a 95% smaller embedded CO2 footprint for building materials compared to the mechanical ventilation system.

Conclusions:

  • While both systems meet regulatory standards, the NOTECH solution presents a more economical and environmentally sustainable option for school ventilation.
  • The NOTECH system offers substantial cost savings and a reduced carbon footprint, making it a viable alternative for school renovations.
  • Further investigation into specific IEQ parameters like air temperature and humidity differences between the systems is warranted.