The International                        UPDATED 30th November 2011
Journal of Ventilation
Published Quarterly www.ijovent.org.uk          Subscribe to Journal  Online 

December 2011 Edition of the IJV now Published  Call for Papers

IJV now included in the Science Citation Index

Paper 1

System Design for Demand Controlled Ventilation in Multi-Family Dwellings

Dorthe Kragsig Mortensen and Toke Rammer Nielsen

Technical University of Denmark, Department of Civil Engineering, Brovej, 2800 Lyngby, Denmark

Abstract

This paper presents an investigation into solutions for the system design of a centralized DCV system in multi-family dwellings. The design focused on simple and inexpensive solutions. A cost benefit estimate showed that the initial cost of implementing DCV in a system with an efficient heat exchanger should not exceed 3400 DKK per dwelling in regions with weather conditions similar to the Danish climate. A design expected to fulfil this requirement was investigated in detail with regard to its electricity consumption by evaluation of different control strategies. Systems with variable airflows are typically controlled by maintaining the static pressure at a fixed level at a selected point in the main duct. However, sustaining the static pressure at a fixed level at part load leads to throttling of all control components and thereby unnecessary energy consumption. Resetting the static pressure at part load reduces throttling and energy can be saved. A static pressure reset strategy was applied to a dwelling-specific DCV system where the airflow varied between three fixed rates. The system performance was evaluated for two diffusers. The annual electricity consumption was reduced by 20% to 30% when resetting the static pressure at part load condition compared to a control strategy with fixed static pressure.

Key words:  residential ventilation, demand controlled ventilation, control strategy, static pressure reset, energy consumption.

Contents

Paper 1
System Design for Demand Controlled Ventilation in Multi-Family Dwellings

Paper 2
A Long-Term Modelling Study of Ventilation and VOC Distribution in Multi-family Residential Buildings in the Severe Cold Region of China

Paper 3
Evaluating the Influence of Window Types on the Natural Ventilation Performance of Residential Buildings in Hong Kong

Paper 4
Effects of Urban Ventilation Patterns on the Carbon Monoxide Concentration in a High-Rise Mega City

Paper 5
A Measurement Study on the Indoor Climate of a College Classroom

Paper 6
Natural Personalised Ventilation - A Novel Approach

Paper 7
Experimental Study of Turbulent Structures in a Non Isothermal Horizontal Jet Issuing from a Round Nozzle Distanced from a Wall

Paper 8
Case Study Assessment of Local and General Thermal Comfort by Means of Local Skin Temperature

A Guide to Energy Efficient Ventilation

Published in 1996, this Guide is aimed at providing a simplified approach to ventilation with particular emphasis on its impact on air quality and energy demand. Numerical discussion is kept to a minimum but sufficient guidance and data are given to enable basic calculations. 254 Pages. Click here for more details