Evaluation of thermal comfort in an office building served by a liquid desiccant-assisted evaporative cooling air conditioning system

Recent studies examined a liquid desiccant indirect and direct evaporative cooling assisted 100% outdoor air system (LD-IDECOAS) as an energy conserving alternative to conventional air conditioning systems. An IDECOAS was introduced as an environmental-friendly air conditioning system that uses latent heat of water evaporation to cool the process air. Recently, studies suggested the integration of a liquid desiccant(LD) system with an IDECOAS to overcome a cooling reduction in evaporative cooling performance in a hot and humid climate.

What is the relationship between humidity and comfort at high temperatures? In search of new ways of looking at the issue

This draft paper was developed as a stalking horse for the Windsor 2014 Conference workshop on Statistics, It presents the results of summer time field work undertaken by Abdulrahman Alsheikh in the region of Damman, Saudi Arabia and the data collected shows that middle class homes families there occasionally report thermal neutrality at very high temperatures and humidities.

An experiment on attention ability based on Electroencephalogram (EEG) in different PMV Conditions

Occupants’ attention ability in seven PMV conditions is measured by means of electroencephalogram (EEG) and verbal voting. This can show us occupants’ attention state change by time and environmental condition. To achieve the objective of this study, seven healthy male students’ EEG was measured in seven PMV conditions each. Their EEG was measured in each condition for 65 minutes. EEG was measured on Fp1 and Fp2, and sorted out according to the frequency using power spectral analysis. The following results were achieved.

Does PMV unnecessarily restrict natural ventilation in buildings?

In this paper, a global map of maximum indoor operational temperatures of buildings is presented. Maximum indoor operational temperatures were evaluated around the world using both PMV and ATC.

Case Study - Thermal Comfort Evaluations in Prayer Halls in two continents.

Field studies have been carried out in selected Prayer Halls to address the research questions namely the impact of air conditioning on comfort of women versus men as well as on general members versus older members of a congregation, who follow universally adopted standard proceedings, and hold prayer meetings every morning from 3.30 am to 5.30 am and every evening from around 7 pm to 9 pm.  Comfort evaluations were carried out in three cities - two of which are presented here.

Summertime Thermal Comfort in Australian School Classrooms

Considering school students spend up to one third of their day inside classrooms, it’s surprising how few detailed empirical studies have been conducted into how the thermal environment of classrooms affects students’ comfort and performance. Whereas PMV tends to exaggerate warm discomfort for adults, the literature suggests it underestimate children’s actual thermal sensation, but there is no coherent explanation for this in terms of metabolic or other physiological differences to date.

Dual stage simulations to study the microclimatic effects of trees on thermal comfort in a residential building, Cairo, Egypt

This paper describes an outdoor-indoor thermal investigation of a multifamily residential building during summer in Cairo, Egypt. Initially, microclimate meteorological data was generated for an urban settlement with and without trees being incorporated in to the development.  The software ENVI-met was used for this first stage. Two kinds of tree planting (15m high Ficus Elastica and 20m Yellow Poinciana) were simulated, together with the existing scenario that has no trees.

Analysis of thermal environment near windows using air barrier technique

The air barrier technique is to apply the special airflow through window fan to improve the thermal environment near the windows in winter and summer, and especially in winter, to simplify the air conditioning system of perimeter zone of office building and avoid condensation on the surface of window. By using numerical simulation, the paper analyzed the thermal environment of the office building, both applied the air barrier technique or not. The paper also compared the two different methods in winter and summer respectably.

A study on the thermal environment in Greek primary schools based on questionnaires and concurent measurements

The present study investigates the indoor thermal comfort perceived by students through a questionnaire survey conducted during spring 2013 in naturally ventilated primary schools in Athens. Thermal environment parameters such as air temperature, relative humidity, air velocity and mean radiant temperature were simultaneously measured. Then, Fanger’s indices of Predicted Mean Vote (PMV) and Percentage of People Dissatisfied (PPD) were calculated by using clothing and metabolic rates.

An Assessment of the Overall Comfort Sensation in Workplaces

The scope of the research described in this paper is to develop, evaluate and propose a new empirical index, the so-called Index of Workplace Comfort (IWC), which quantifies the overall comfort sensation of a user in an office building. The proposed Index of Workplace Comfort is calculated on the basis of both environmental and psychological properly weighted sensation votes of workplace occupants.