Air Enthalpy as an IAQ Indicator in Hot and Humid Environment—Experimental Evaluation

Abstract

The authors studied the impact of indoor air humidity in the range of 60% to 90% on building user perception in the temperature range of 26 to 28 °C. The research thesis was put forward that the impact of humidity on indoor air quality dissatisfaction of building users in a warm and humid indoor environment is greater than that indicated in thermal comfort models. The presented experiment examined the indoor air quality perception of n = 28 subjects in the test chamber of a nearly zero energy building under ten environmental conditions, together with a thermal comfort assessment. The authors developed an experimental relation for predicting building users’ satisfaction based on the Weber–Fechner law, where the predicted percentage of dissatisfied users (PD) is determined by means of air enthalpy (h), PD = f(h). The obtained results confirmed the sated thesis. Additionally, the intersection points of the experimental function and isotherms resulting from the Fanger model are presented, where the thermal comfort assessment starts to indicate lower user dissatisfaction results than experimental values. The authors recommend the experimental equation for humid air enthalpies in the range of 50 to 90 kJ/kg. The indoor air quality assessment based on the enthalpy value is simple and can be used to determine the overall Indoor Environmental Quality index of a building (IEQindex).

A Handbook of Management Theories and Models for Office Environments and Services

“…For example, energy use and consumption of resources at the workplace contribute to emissions of greenhouse gases, priority air pollutants, chemical emissions, ozone-depleting emissions and radioactive emissions. These in turn have health impacts such as relatively higher temperature, higher humidity, poor indoor air quality, poor illumination and poor ventilation (Piasecki et al, 2020). Sustainable economic growth therefore depends on how technological advances, inventions and digital innovations -such as technological software, project management systems and various communication devices and channels -are adopted to make both work and workplace practices sustainable (Hansen & Hoffman, 2011; see also Chapter 14 on radical innovation).…”

Impact of Lockdown Measures during COVID-19 Pandemic on Water Vapors in Subtemperate and Subtropical Zones of Jammu Region, Jammu & Kashmir Union Territory, India

“…Cumulative analysis highlighted significant deviation of -5.45 % in subtropical zone and 6.62 % in subtemperate zone of Jammu province. However, it's already proven that the enthalpy depends mainly on two parameters: temperature and humidity and with increase or decrease in temperature there is increase or decrease in enthalpy [22] that' why we have observed decrease in enthalpy with decrease in temperature in subtropical zone but the increased enthalpy in subtemperate zone can be correlated with increased air pressure [23].…”

Test rooms to study human comfort in buildings: A review of controlled experiments and facilities

“…The goals of a multi-domain experiment can be categorized into (i) evaluate the effect of specific building technologies or control strategies on occupant multi-domain comfort [119,[245][246][247][248][249][250]; (ii) understand cross-modal and interaction between different domains [46,72,[251][252][253][254][255][256][257][258][259][260][261][262][263][264][265][266][267][268]; (iii) model the physiological [97,100,228,269,270] or behavioural [271][272][273] response of occupant to combined multi-domain stimuli and to understand the effect of IEQ on stress [274,275]; (iv) identifying new multi-domain metrics such as air enthalpy [251], air distribution index [276] and bio-signals such as skin temperature [277] for the whole comfort. In some cases, the energy consequences of such multi-domain interactions are also captured, as for the studies investigating novel personalized thermostats [272,278,279]…”