IBPSA1999

This paper is focused on the evaluation of simulation system using the experiment result and the con- figuration of peri-counter which is the part of counter unit setting at bottom of window side with heat panel to avoid the influence of cold draft, utilizing simu- lation system. The simulation shows similar flow pattern to full scale experiment and consequent simu- lations indicate that cold draft does not flow into interior zone when the heat generation rate exceeds heat loss from the window in most cases.

We present in this paper the essential aspects of the S2 system. This is the  internet realization of SEMPER: An active, multi-domain, space-based, object oriented design environment for integrated building performance modeling. We begin with an overview of SEMPER principles. We then present the component based system architecture of S2, which makes use of the Common Object Request Broker Architecture (CORBA) for communication between components including our analysis applications (written in C++) and other S2 components (written in Java).

The paper outlines a two-year research program where Radiance was used in the conversion of Empress Place, a national monument in Singapore, into an Asian Civilisation Museum. The paper describes how the research team fine-tune the modeling and software set- tings to cope with some of the contextual issues of design. Inaddition, the paper discusses how Radiance could be used to aid the design of the building. One of the more difficult tasks the researchers faced was to model and validate some of the daylighting control devices that are part of the existing features of the build- ing.

Nowadays   architects   commonly   use   the   ‘coupled space concept’. Examples are mezzanines, half-open office spaces and exhibition rooms. Because  of  the need to meet acoustical standards, the need to predict sound pressure levels and reverberation times for this category of spaces is ever growing.The transmission of sound from one space to another depends on design decisions like position, shape and dimensions of each of the interconnected spaces and of the “gap” between the spaces.

The numerical model for the analysis of the combined convective-conductive heat transfer in the building components has been developed. Presented model is based on the partial differential equation for the two- dimensional steady-state heat transport caused by conduction and convection. The finite element method was used to obtain the numerical solution of the governing equation. The general finite element formulation was derived by means of the Petrov- Galerkin approach. The developed computer program was used to study one typical lightweight building wall  construction.

Building dynamic simulation has been available to building design engineers for some time. However steady state methods are still being used and these methods do not provide the information required for making informed decisions on the best design options. An existing high specification building designed using steady state methods is used to compare the HVAC plant sizes installed to the plant sizes that would have been required if building simulation methods had been used.

An evaluation method for life cycle energy (LCE) and CO2 (LCCO2) of houses by the  system dynamics (SD), a method for understanding how all the objects in a system interact with one another, was presented. The building design strategies to predict and reduce the environmental loads for the several types of construction and building materials were investigated.

The  use  of  split-type  air-conditioners  in  new apartment buildings becomes popular in Hong Kong. One requirement for their effective use is satisfactory heat rejection at the outdoor condensing units.  When a group of outdoor units is working together, the heat released by one condenser may affect the heat rejection rates at the others, and hence may deteriorate their performance.

This paper presents a mathematical model yielding a simplified representation of the thermal behaviors of ivy-covered walls. The model is integrated with a CFD program to implement simulation. Experimental results have been used to form the boundary conditions of numerical simulations. A series of parametric sensitivity analyses have been carried out for identifying the key factors that affect  ivy- coverings’ potential for reduction on cooling load of the buildings. These analyses indicate that ivy- coverings can considerably reduce the heat flux through the external walls that its cover.

When some faults take place in a thermal storage HVAC system, changing pattern of the temperature profiles of the thermal storage tank is useful to infer where some faults exist. Authors designed some parameters calculated from the temperature profiles of the thermal storage tank in HVAC system and their Fourier Transform to detect the difference between the normal and faulty state. Further, present paper shows practicality of two methods of parameter optimization, a differentiation rate increment method and  a  variable  selection  method,  with  an  actual application to a hospital.