Multizone building with VAV air-conditioning system simulation for evaluation and test of control systems

Simulation techniques have been playing a more and more important role in research and development of reliable and energy efficient building automatic control solutions. Furthermore, simulation is appraised as being viable to judge building automation and control solutions. Therefore, to test and evaluate control strategies, Siemens Building Technologies (SBT) developed a building and HVAC (heating, ventilation and air-conditioning) plant model library.

Hydronic radiant floor for heating and cooling coupled with an underground heat exchanger: Modeling approach and results

This paper explores the simulation of the thermal performance of a radiant floor for heating and cooling that is connected with an underground heat exchanger installed under the concrete floor of a house. In the heating season, an electric boiler is used to maintain the operative temperature at the set point value by varying the supply water temperature to the radiant slab. In the cooling season, the water from the radiant floor is circulated through an underground heat exchanger installed under the concrete slab.

Double-skin system of room-side air gap applied to detached house (Part 2): Simulation analysis to reduce cooling load through natural ventilation in wall

In Japan, wooden detached residential houses are common; the wood components within a wall may undergo decay because of condensation in the wall or flushing defects, which can be a concern. The temperature distribution throughout the house, such as a high temperature in the attic space, can cause discomfort to the occupants. A double-skin system of room-side air gaps is considered to be an effective technique to handle these problems.

Development and testing of photovoltaic pavement for heat island mitigation

Τhe present article deals with the development and testing of photovoltaic pavement for heat island mitigation. The scope of this study is to evaluate its contribution to the balance of the Urban Heat Island phenomenon. For this reason, we made a photovoltaic pavement for purely experimental reasons (dimensions 3.5x1.3m) that consists of two different voltage polycrystalline photovoltaic panels. On top of them, a triplex security glass with a nonslip silk screen, PVB standard 1.14 mm was placed.

Low-Cost Thermoelectric Module Attic Ventilation

This paper investigates the performance of a new attic ventilation concept using low-cost thermoelectric (TE) modules. Incident solar radiation heats up roof tiles thus creating a temperature difference between tiles and attic. By making use of this temperature difference, laboratory made low-cost thermoelectric modules, assimilated as roof tiles, could produce an electric current to drive a fan for attic ventilation. First, a low-cost TE module consisting of 7 couples of N and P type Bi-Sb-Te materials was fabricated on a 2x2 cm2 aluminium substrate.

Double-skin system of room-side air gap applied to detached house (Part 1): Simulation Analysis for reduction of cooling load in the forced ventilated wall of detached house

Detached residential wooden houses are a common type of housing in Japan. Decay of wooden components within the walls caused by condensation or defective flushing, is sometimes an issue. To solve this problem, a double-skin system with a room-side air gap was developed. In this system, during summer, the airflow that is driven by ventilation fans moves through the room-side air gap in the wall, and removes heat load either from the inner surface of the insulation material, or from the surface adjacent to the rooms inside.

Façade-integrated ventilation systems in nordic climate

The work evaluates the applicability of façade-integrated ventilation systems in a Nordic climate. For this purpose the state of the art of façade-integrated ventilation (FIV) and demands for ventilation system in Norway and criteria for an comprehensive evaluation are identified. In this framework agreements between national requirements and system-specific performance are assessed. The evaluation investigates indoor environment and comfort with focus on aspects of indoor air quality.

Exhaust ventilation under 5 ventilation standards : A performance assessment

Sizing rules in residential ventilation standards lack uniformity in both methodology and resulting design flow rates. Additionally, mere comparison of design flow rates is case sensitive and, due to effects of infiltration, adventitious ventilation and occupancy, ill-suited to assess performance of an exhaust ventilation system with regard to the achieved indoor air quality and energy cost in terms of heat loss.

Optimal sizing rules for natural, simple exhaust and mechanical residential ventilation systems

Sizing rules in residential ventilation standards lack uniformity in both methodology and resulting design flow rates. In order to investigate the best achievable performance of natural ventilation, exhaust and fully mechanical ventilation systems, this paper presents a multi-zone simulation based optimization study for both a detached dwelling.

Lessons learned on ventilation systems from the IAQ calculations on tight energy performant buildings

During the project QUAD-BBC, several ventilation systems have been studied in residential (individual house and collective dwellings) and non-residential (school, offices) and assessed by the evaluation of an IAQ multi-criteria.
These calculations have shown some typical evolution of pollutants in very tight low consumption buildings and can alert on some possible effects.

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