IBPSA1997

A large office building has been the object of a detailed feasibility study in order to select the most effective actions for energy saving in space cooling. Actions concerning the modification of building envelope layout, including materials, shading devices, colours, and retrofit insulation have been tested together with a set of improvements of the lighting system and an extensive use of daylighting strategies. Building energy performances under the various retrofit hypotheses have been assessed by means of DOE-2.1E.

This paper describes the simulation of electric storage heaters and their controls. A method for modelling manual control, inferred from transformer readings, is described. Use of the dynamic simulation language ESL compiled into a single program with an existing building simulation program, is explained. This provides a powerful and flexible tool for the evaluation and development of storage heaters and controls. Optimisation of storage heater controls has been shown to be a complex process which requires a sophisticated modelling approach.

A method to evaluate the energy demand for lighting on an hourly basis is presented. The method is based on a raytracer and a dynamic modelling of the sky’s luminance distribution. The link to the thermal building simulation is shown by examples.

Epidemiological evidence suggests that mould infestation in buildings can have serious health implications for the occupants. On the basis of an analysis of published data, growth limit curves for six generic mould categories have been generated in terms of the minimum combination of temperature and relative humidity required to sustain growth on indoor building surfaces. These limits have been incorporated within the ESP-r system for use in conjunction within combined heat and moisture flow simulations.

Life-cycle design of air conditioning systems requires that plant should be capable of maintaining zone comfort conditions within specified limits, while minimising capital and operating costs. Lack of suitable design tools often prevents these objectives being met in conventional design practice. ZEBRA is a software package designed to simulate the performance of air conditioning plant across the whole range of operation. The structure of the package, which uses object-oriented methodologies, is described, as is its relationship to existing plant modelling codes.

Many building simulation computer programs, originally developed on mainframe computers for research purposes, can now run on the powerful workstation and personal computers that are available to most architectural and engineering firms. Major efforts have been underway during the last decade to compile these programs on personal computers and make them available to a wider range of building professionals. However, even with the addition of user-friendly front- and back-ends, their use is still limited to a small number of specialized consultants.

This paper describes the use of daylight coefficients in a computer tool which is based in Monte Carlo backward ray tracing merthod and was developed under the frame of DAYLIGHT- Europe EC Project. Following the daylight coefficients approach the intereflection calculation is carried out once for each zone and it doesn’t have to be repeated if the sky luminance distribution changes.

In this paper, a new method of direct run - time coupling between building energy simulation and global illuminance simulation is outlined and discussed. Direct coupling at the time step level between ESP-r and RADIANCE provides building energy simulation with access to an internal illuminance calculation engine, thus enabling modelling of the complex interactions between artificial lighting control and the rest of the building energy domain in a fully integrated way.

A controller for heating systems is normally equipped with many facilities to make it flexible and the heating system more cost-efficient. This results in a number of input parameters to be given by the user. It is not obvious how to choose appropriate values for these parameters unless the user has a large experience in this field. The aim of this paper is to reduce the number of parameters, with thermal comfort and energy consumption intact. This paper will show the benefits with a feedback from the room temperature.