supply air

In an extensive simulation study using a multi-zone airflow and contaminant transport calculation software (CONTAM) recommendations for the supply air rates for residential housing were derived as input for the revision of the Austrian standard ÖNORM H 6038 (2014). The floor plan, the occupancy and the contaminant and humidity sources are modelled to represent a typical Austrian housing situation. A humidity buffering model is also implemented. Based on common thresholds for CO2, relative humidity (r.h.) and TVOC the so-called relative threshold deviation is determined.

DEVELOPMENT OF A PCM AIR FILTER AND ITS APPLICATION TO A CONSTANT The authors have developed a PCM air filter which stabilizes the temperature of air passing though it. This PCM filter has great potential for applications that require a constant temperature air supply. In addition, it can simplify temperature control systems and can contribute to energy conservation. The material in the filter consists of sponge fibers coated with paraffin followed by a coating of resin to prevent leakage and vaporization of the paraffin.

The authors have proposed a system for stabilizing air temperature using direct heat exchange between granulated phase change materials (PCM) and air. This paper describes experiments in which air whose temperature is periodically changed to simulate changes of outdoor air temperature is passed through a bed of granulated PCM. These experiments demonstrate that output air temperature is stabilized and remains within the phase change temperature range. Results calculated by a computer simulation program described in a previous paper duplicate the experimental results.

Describes how a Wisconsin engineer is using basic thermodynamic principles and readily available equipment to design innovative heating, ventilating and air conditioning systems. The hybrid HVAC designs offer two crucial elements: supply ventilation composed of 100% outdoor air and significantly reduced energy consumption. The new systems are both competitive in price to conventional systems and also less expensive to maintain. In one case study the hybrid system ventilates a 33 year old school building with 100% outdoor air and reduces building energy costs by at least 21%.

A currently unresolved problem in building design is the paradox between increasing demandfor good thermal insulation, and the requirement for ample levels of ventilation, to maintain ahealthy indoor environment. A possible solution to this problem is a supply air ventilatedwindow. This utilises an airflow between panes to pre-heat ventilation air to the building, andto reduce thermal convection losses thus reducing the window U-Value. At the base of thewindow is a vent to the external environment, allowing air inflow.

Fuel-burning appliances require air for combustion. When the appliances are located in enclosed spaces, provision must be made for supplying the required amounts of air. Depending on the specifics of the appliances and the enclosure, additional air may be required for draft hood dilution and space conditioning. An enclosed space can be a mechanical room in a building, a furnace room in a residence or the entire floor of a building if a separate enclosure is not used to isolate the combustion appliance(s).