An office building with electrical and fan coil heating system is designed to test Building Management System (BMS). This tool called SIMBAD (SIMulator of Building And technical Devices) is used in order to realise performance monitoring control tests. The building consists of 6 zones and is equipped with electrical convectors or fan coils.
Nowadays an air-conditioning design engineer is faced with a challenging task to minimise energy consumption and capital costs. One of the most common solutions is to apply heat recovery device. However, simple application of heat recovery device may not always produce energy cost savings. Sometimes investment costs may overcome energy savings, and feed-back period may be longer than equipment lifetime. Usually, the conditions in which use of heat recovery device, in the air-conditioning systems, is economical, is not strictly and clearly defined.
This paper aims to advance the knowledge related to the simulation of electrochromic glazing switching control. First, a critical evaluation of existing control strategies currently available in the DOE-2.1E program was performed to study the effect of several driving variables on the cooling load of an existing large office building. Second, the present capabilities of the DOE-2.1E program were expanded using the Functional Values approach which enables the user to introduce new algorithms (e.g., control strategies) without recompiling the program.
A simplified tool for estimating energy consumption of a whole air conditionned building is presented. It is developped to help design engineers to quickly estimate HVAC solutions till initial design. HVAC systems as fan coils, variable and constant air volume are available. The model is developped to need few inputs in such a way that it could be used very soon in the design process, when materials and building characteristics are not fixed in details.
The thermal behavior of large supermarkets is dominated by internal gains. Specifically, refrigerated and frozen food display units area is characterized by cool loads created by commercial cases, which are also moisture trap. A coupling approach of air conditioning with display cases operation is proposed in this paper, based on a model of the cold aisle phenomenon. In this area, the significant vertical stratification of air has to be considered to calculate electric consumption of display cases. Heat and moisture exchanges are calculated and typical values are given.
During the last ten years, many HVAC simulation models and calculation tools were developed. However, until now, the practical use of simulation tools is still very limited in building and HVAC design as well as in the development of control strategies. This paper focuses on the selection and sizing of a centralized cooling plant. Its purpose is to show how the simulation can help the designer and to point out the difficulties encountered by the simulation user. In the design stage, various alternative cooling systems are available.
Most of the dynamic models of hot water boilers are either "reference" models or too simplified ones. The formers require sophisticated computation facilities (they are CPU - time consumers) and very detailed data on boiler geometry which are usually not available. The latters are generally identified models based on experimental tests, thus their range of validity is limited to the domain covered by the experimental data. This paper presents a simplified second order dynamic model which uses available manufacturer data.
A new concept of combustion control system, based on an optical information from the flame spectrum, is applied to a domestic fuel oil boiler. The objective is to achieve the maximum thermal efficiency of the boiler, while keeping a stable flame and the pollutant emissions as low as possible. CH radicals and soot continuum emissions, measured with a spectrometer just downstream of the burner exit, provide the information needed.
This study presents the method, procedure and partial results of commissioning of air conditioning system. The work was carried out with Justus Lispsius building of the Ministry Council of the European Union in Brussels. The objective of the commissioning is to check the hydraulic characteristics of air distribution system and the thermal performance of air handling units, use the simulation method to predict the cooling demand, improve the performance of air-conditioning system, eventually minimise the energy consumption.
Fan coil units are widely used to realise a thermally comfortable indoor climate in rooms. The main components are the heating coil, the control valve and the fan. Hot water flows through the heating coil and heats the passing room air. In case cooling is required also a cooling coil is installed. This paper presents a new control system. This control system uses inexpensive open/closed valves for precise control of heat, released by the fan coil unit. It uses two cascade control loops to adjust the indoor temperature. The main control loop controls the indoor air temperature.
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