Abstract
There are different standards and regulations outlining the requirements regarding building air quality as well as in nurseries. These requirements specify air stream supplies and carbon dioxide concentration levels, both of which ensure proper indoor air quality. Mechanical ventilation should be used to maintain acceptable carbon dioxide levels. This article analyses the use of ventilation equipped with decentralized units, which helps secure the well-being of children. This paper proposes and evaluates economically affordable ventilation units. An algorithm for selecting the size of the devices is described by the supplied air stream depending on the number of children present at the nursery. A method of transferring the investment costs related to the assembly of the given units to the parents is proposed. Air quality in terms of CO2 concentrations was based on the following levels: 750 ppm, 1000 ppm, 1500 ppm. This assessment also includes the investment costs resulting from device usage and the costs of electricity consumed by the fans. These results showed the additional costs that assure the air quality improvement do not have to be high (45 PLN/month, ~10 EUR/month) per child attending the nursery. A 3% tuition increase returns the investment costs on mechanical ventilation within four years.
Highlights
This paper presents research regarding the economic costs of securing proper air quality using a decentralised ventilation system equipped with reversible fans and heat recovery exchangers
The low level of electricity consumption stems from the low static pressure of such ventilation units
It can even have a positive effect on maintaining the temperature in the room without heating caused by the presence of people. These analyses demonstrate a compromise between sufficient air quality, technical possibilities of installation of ventilation units and the investment costs may bring some very good results. These results address the demands of Sappanen et al [52] to seek the solutions, which allow for supplying the room such an air stream volume to provide a good indoor air quality without raising maintenance costs
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The population of Poland was 38,479,000 at the end of 2014 and included 2,801,000 children from 0–7 years of age, which comprised 7.3% of the total Polish population [1]. Half of the children in Poland live in the cities, which forces their working parents to pay for child care. 12.4% of parents send their children to public or non-public nurseries due to the lower costs. According to data provided by the Central Statistical Office, the number of institutional care places for children up to age 3 in 2019 has increased by 15.4%
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