English

The paper presents a comparison of the simulation results and measured operating parameters of building in Slovakia. Attention is paid to the overall energy performance of the building during annual operations. Paper contains basic information on the building, technical equipment, design, material solutions as well as information from in-situ measurements. Paper presents simulation results of the building under the boundary conditions obtained from measuring in-situ. Energy performance of buildings during the actual operation and simulation are  generally identical.

As the solar thermal system with the floor heating and the hot-water supply system need low temperature of 40-50 degC, the effectiveness of solar collector is high. However, in the summer season, floor heating is unnecessary, and so there emerges a lot of surplus solar heat. By utilizing such surplus heat in summer as heat source for desiccant dehumidification activated with hot water at a temperature of about 70 degC 1) , it would be possible to use a solar heat collecting system efficiently all year round.

In an international simulation study, the measures to be taken with an example retrofit building at different locations were quantified in order to reach the energy demand goal of 30 to 50 kWh/m2 a of primary energy for heating, ventilation and domestic hot water production. A systematic difference in the results from the simplified and the detailed calculation tools for the building "as is" at its original location could be identified mainly by the different treatment of losses to unheated spaces.

The purpose of this paper is to evaluate the energy conservation potential of an underfloor air distribution (UFAD) system integrated with an indirect and direct evaporative cooling assisted 100% outdoor air system (IDECOAS) in hot and humid climate. It is assumed that an office space is served by five different HVAC systems. Energy simulation for each system was performed using a commercial equation solver program, and the operating energy consumption in each system is compared.

In general, HVAC systems for clean room facility are required significant energy to maintain the required indoor environment. Due to high air change rates, reducing operating energy consumptions has been the critical issue. The purpose of this paper is to investigate energy saving potentials of 100% outdoor air system integrated with indirect and direct evaporative coolers (IDECOAS) serving a clean room.

The aim of this paper is to investigate the relationship between Indoor Environmental Quality index (IEQ): thermal comfort index and indoor temperature trend in moderate thermal environments, in buildings that belong to the Class A with reference to the Energy Performance of Building Directive (EPBD). The work consists of the measurement of IEQ and energy efficiency in a residential building located in centre-north of Italy. The results of the measurements, as well as the PMV-PPD indexes are presented and commented.

Numerous researches have shown the possibility to enhance indoor natural ventilation in buildings by using inclined solar chimneys, although most of them usually include determining an optimum tilt for the absorber, considering an inclination angle between maximum solar irradiation and best stack height.

The objective of this paper is to present space heating strategies leading to a load reduction during critical periods on the grid but also taking into account the occupant thermal comfort in order to make them acceptable. Using TRNSYS, three types of strategies were investigated: lowering the thermostat setpoint, storing heat in the building thermal mass during off-peak hours and lowering the setpoint during critical periods, and limiting the available power to baseboards.

This paper presents the findings of an investigation of electricity consumption in mechanically cooled Nigerian office buildings.  

Low temperature heating and high temperature cool-ing systems such as thermally activated building sys-tems (TABS) offer the chance to use low exergy sources, which can be very beneficial financially as well as ecologically when using renewable energy sources.The above has led to a considerable increase of water based radiant systems in modern buildings and a need for reliable simulation tools to predict the indoor envi-ronment and energy performance.This paper describes the comparison of the building simulation tools IDA ICE, IES VE, EnergyPlus and TRNSYS.