Matthew Li, David Allinson and Kevin Lomas
The purpose of this paper is to identify the impact of traditionally unmonitored energy sources and sinks on assessment of the as-built thermal performance of occupied homes. The…
Abstract
Purpose
The purpose of this paper is to identify the impact of traditionally unmonitored energy sources and sinks on assessment of the as-built thermal performance of occupied homes. The analysis aims to demonstrate the potential scale of uncertainties introduced in a heat balance estimation of the heat transfer coefficient (HTC) when using in-use monitored data.
Design/methodology/approach
Energy flows for two UK homes – one a 1930s dwelling with high heat loss, the second a higher-performing 2014-built home – are predicted using the UK Government’s standard assessment procedure (SAP) and visualised using Sankey diagrams. Selected modelled energy flows are used as inputs in a quasi-steady state heat balance to calculate in-use HTCs as if from measured data sets gathered in occupied homes. The estimated in-use HTCs are compared against SAP-calculated values to illustrate the impact of including or omitting various heat sources and sinks.
Findings
The results demonstrate that for dwellings with low heat loss, the increased proportion of heating demand met by unmetered internal and solar gains informs a greater sensitivity of a heat balance estimation of the HTC to their omission. While simple quasi-steady state heat balance methods may be appropriate for dwellings with very high heat loss, alternative approaches are likely to be required for those with lower heat loss.
Originality/value
A need to understand the impacts of unmetered heat flows on the accuracy with which a building’s thermal performance may be inferred from in-use monitored data is identified: this paper illustrates the scale of these impacts for two homes at opposite ends of the energy performance scale.
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Ben M. Roberts, David Allinson and Kevin J. Lomas
Accurate values for infiltration rate are important to reliably estimate heat losses from buildings. Infiltration rate is rarely measured directly, and instead is usually…
Abstract
Purpose
Accurate values for infiltration rate are important to reliably estimate heat losses from buildings. Infiltration rate is rarely measured directly, and instead is usually estimated using algorithms or data from fan pressurisation tests. However, there is growing evidence that the commonly used methods for estimating infiltration rate are inaccurate in UK dwellings. Furthermore, most prior research was conducted during the winter season or relies on single measurements in each dwelling. Infiltration rates also affect the likelihood and severity of summertime overheating. The purpose of this work is to measure infiltration rates in summer, to compare this to different infiltration estimation methods, and to quantify the differences.
Design/methodology/approach
Fifteen whole house tracer gas tests were undertaken in the same test house during spring and summer to measure the whole building infiltration rate. Eleven infiltration estimation methods were used to predict infiltration rate, and these were compared to the measured values. Most, but not all, infiltration estimation methods relied on data from fan pressurisation (blower door) tests. A further four tracer gas tests were also done with trickle vents open to allow for comment on indoor air quality, but not compared to infiltration estimation methods.
Findings
The eleven estimation methods predicted infiltration rates between 64 and 208% higher than measured. The ASHRAE Enhanced derived infiltration rate (0.41 ach) was closest to the measured value of 0.25 ach, but still significantly different. The infiltration rate predicted by the “divide-by-20” rule of thumb, which is commonly used in the UK, was second furthest from the measured value at 0.73 ach. Indoor air quality is likely to be unsatisfactory in summer when windows are closed, even if trickle vents are open.
Practical implications
The findings have implications for those using dynamic thermal modelling to predict summertime overheating who, in the absence of a directly measured value for infiltration rate (i.e. by tracer gas), currently commonly use infiltration estimation methods such as the “divide-by-20” rule. Therefore, infiltration may be overestimated resulting in overheating risk and indoor air quality being incorrectly predicted.
Originality/value
Direct measurement of air infiltration rate is rare, especially multiple tests in a single home. Past measurements have invariably focused on the winter heating season. This work is original in that the tracer gas technique used to measure infiltration rate many times in a single dwelling during the summer. This work is also original in that it quantifies both the infiltration rate and its variability, and compares these to values produced by eleven infiltration estimation methods.
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Singh Intrachooto and Daniel Arons
This article observes how, in today’s common building practice, design practitioners seldom utilize the expertise of researchers in building‐related fields. The lack of the…
Abstract
This article observes how, in today’s common building practice, design practitioners seldom utilize the expertise of researchers in building‐related fields. The lack of the collaboration may be due as much to the “applicability gap” between research and practice as to the lack of a clearly defined role of researchers in building design. Most institutions’ research groups and facilities planning offices are generally not set up to collaborate with the design and engineering professionals. This study, however, found design teams’ collaboration with academic and research institutions to be instrumental in the successful development and implementation of technological innovations in architectural projects. It discusses the findings and provides partnership strategies between the institutions, as large‐building owners, and the building professionals, as design providers.
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Laurie Lomas and Kevin Tomlinson
Reports on and analyses the attitudes towards standards in higher education of a random sample of senior managers, senior administrators and senior academics in a range of…
Abstract
Reports on and analyses the attitudes towards standards in higher education of a random sample of senior managers, senior administrators and senior academics in a range of different types of higher education institutions. In order to construct an analytical framework for the empirical research, there is a synthesis of the current debate on standards. The research data were collected in two phases; first, by means of 21 in‐depth interviews in seven higher education institutions and, second, through the questionnaire responses of a larger number of senior staff in a greater number of institutions. Generally, the research results indicate that senior academics are more concerned about falling standards than their senior manager and senior administrator colleagues. This concern over standards appears to be more pronounced in older universities.
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In this chapter, I focus on stigmatization exercised and experienced by local residents, comparing two socially-diverse areas in very different contexts: the Cabrini Green-Near…
Abstract
Purpose
In this chapter, I focus on stigmatization exercised and experienced by local residents, comparing two socially-diverse areas in very different contexts: the Cabrini Green-Near North area in Chicago and the La Loma-La Florida area in Santiago de Chile.
Methodology/approach
Data for this study were drawn from 1 year of qualitative research, using interviews with residents and institutional actors, field notes from observation sessions of several inter-group spaces, and “spatial inventories” in which I located the traces of the symbolic presence of each group.
Findings
Despite contextual differences of type of social differentiation, type of social mix, type of housing tenure for the poor, and public visibility, I argue that there are important common problems: first, symbolic differences are stressed by identity changes; second, distrust against “the other” is spatially crystallized in any type and scale of social housing; third, stigmatization changes in form and scale; and fourth, there are persisting prejudiced depictions and patterns of avoidance.
Social implications
Socially-mixed neighborhoods, as areas where at least two different social groups live in proximity, offer an interesting context for observing territorial stigmatization. They are strange creatures of urban development, due to the powerful symbolism of desegregation in contexts of growing inequalities.
Originality/value
The chapter contributes to a cross-national perspective with a comparison of global-north and global-south cities. And it also springs from a study of socially-mixed areas, in which the debate on concentrated/deconcentrated poverty is central, and in which the problem of “clearing places” appears in both material (e.g., displacement) and symbolic (e.g., stigmatization) terms.
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Krishantha Wisenthige, Udeshika Pathirana, Bimsara Perera, Kevin Wijesinghe and Anjana Wijethunga
The study utilized a quantitative approach to investigate student satisfaction, focusing on the lecturers’ knowledge, quality of delivery, student support and evaluation. The…
Abstract
Purpose
The study utilized a quantitative approach to investigate student satisfaction, focusing on the lecturers’ knowledge, quality of delivery, student support and evaluation. The population included second- to fourth-year undergraduates, data from a sample of 600 were collected through a structured questionnaire using stratified random sampling and analyzed using structural equation modeling (SEM).
Design/methodology/approach
The aim of this study is to examine the various dimensions of academic staff quality that affect student satisfaction within a selected private higher educational institute in Sri Lanka, providing a clear understanding of the dimensions of academic staff quality and recognizing the important role of the said dimensions in shaping the educational experience of the students.
Findings
Results revealed that effective support for students, lectures’ broader knowledge, quality of delivery and quality of evaluation were significant predictors of student satisfaction and that they are crucial indicators of how strong the impact of the academic staff is in contributing to overall undergraduate student satisfaction.
Originality/value
This study filled a gap in higher education research in Sri Lanka by offering empirical evidence on the impact of academic staff quality on satisfaction among students in private universities. It serves as a valuable reference for those exploring higher education concepts, providing a novel understanding of the influence of the key component of academic staff quality.
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The British countryman is a well‐known figure; his rugged, obstinate nature, unyielding and tough; his part in the development of the nation, its history, not confined to the…
Abstract
The British countryman is a well‐known figure; his rugged, obstinate nature, unyielding and tough; his part in the development of the nation, its history, not confined to the valley meadows and pastures and uplands, but nobly played in battles and campaigns of long ago. His “better half”—a term as true of yeoman stock as of any other—is less well known. She is as important a part of country life as her spouse; in some fields, her contribution has been even greater. He may grow the food, but she is the provider of meals, dishes, specialties, the innovating genius to whom most if not all British food products, mostly with regional names and now well‐placed in the advertising armentarium of massive food manufacturers, are due. A few of them are centuries old. Nor does she lack the business acumen of her man; hens, ducks, geese, their eggs, cut flowers, the produce of the kitchen garden, she may do a brisk trade in these at the gate or back door. The recent astronomical price of potatoes brought her a handsome bonus. If the basic needs of the French national dietary are due to the genius of the chef de cuisine, much of the British diet is due to that of the countrywoman.