effectiveness

Heat and mass flow between cold and warm environments due to the pressure difference between both sides. This exchange causes a loss of energy and human comfort in the buildings. The indoor air quality (IAQ) also reduces because of the passage of dust, odour, insects and bacteria along with the fluid across a doorway. To minimise this heat and mass flux and to maintain IAQ, an air curtain is often used as an artificial separation barrier in public and industrial buildings.

When considering the performance of HRV systems, the discussion is generally focusing on the reported effectiveness of the air-to-air heat exchanger. Although some excellent presentations at the AIVC conference in the past have dealt with uncertainties related to the test of that effectiveness, the fact that the heat recovered by the HRV unit might not be useful in an intermittently heated dwelling without room-by-room based demand control is usually not considered. Therefore, the ‘use-factor’ for the recovered heat is quantified in this paper.

Although it has been used for many years in commercial buildings, the application of demand controlled ventilation in residences is limited. In this study we used occupant exposure to pollutants integrated over time (referred to as "dose") as the metric to evaluate the effectiveness and air quality implications of demand controlled ventilation in residences. We looked at air quality for two situations. The first is that typically used in ventilation standards: the exposure over a long term.

In an indirect evaporative cooling (IEC) installation the extracted air is cooled by means of adiabatichumidification. By passing over an air/air heat exchanger this air cools down the supply air. A clearinteraction can be observed between the relative humidity of the extracted air and the thermal comfortrealized in the building.

This project presents the performance of air washer chilled water coil system for a yarn industry .The basicprinciples including (1) effectiveness, (2) saturation efficiency and energy consumption for the systems are evaluated.. In addition these spray system prevents the contaminants produced in yarn industries entering into the system. This paper also presents the results of direct evaporative cooling processes, energy efficiency ratio and cooling efficiency for the air washer chilled water coil system.