This article gives an overview over the Guideline VDI 2167 'Building services in hospitals – Heating, ventilation and air-conditioning' which is based on the Swiss Guideline 'Heating, ventilation and air-conditioning systems in hospitals (Planning, construction, operation)' of the SWKI 'Schweizerischen Verein von Wärmeund Klima-Ingenieuren'. Other than editorial changes which were carried out w...

The role of ventilation in the housing stock is to provide fresh air and to dilute internally-generated pollutants in order to assure adequate indoor air quality. Energy is required to provide this ventilation service, either directly for moving the air or indirectly for conditioning the outdoor air for thermal comfort. Different kinds of ventilation systems have different energy requirements. ...

One of the main elements for increasing energy efficiency in large-scale buildings is identified correct management and control Heating Ventilation Air Conditioning (HVAC) systems, particularly those with Heat Pumps (HPs). The present study aimed to evaluate perspective savings achievable implementation an optimal HVAC HPs. proposed measures involve use a variable air volume system, demand-cont...

Biofilms comprise diverse bacteria and fungi with slime material, especially in humid conditions. The surface of the heat ventilation air conditioning (HVAC) system, at evaporator, is high moisture conditions due to compression relaxation refrigerant. electrically polarized molecules, which include polysaccharide, DNA, liposome, amino acids. Thus, when an electric field applied biofilms, create...

A key component in low energy houses is the heat recovery from the ventilation air. Over recent years, the most frequently used ventilation type is the mechanical ventilation with heat recovery. This kind of ventilation results in high heat recovery but does unfortunately consume a considerable amount of electrical energy. Natural or hybrid ventilation has the potential to consume less electric...

Balanced ventilation with heat recovery has strong effects on radon mitigation and energy saving in residential buildings. This new technology enables improvement of both indoor air quality and energy efficiency without sacrificing either. Reducing radon by means of forced ventilation requires an increase in outdoor supplied air (i.e. ventilation rate), which in turn can increase energy use. En...

The aim of this study was to establish whether the air-conditioning system in buses constitutes an additional source of indoor air contamination with fungi, and whether or not the fungi concentration depends on the period from the last disinfection of the system, combined with replacement of the cabin dust particle filter. The air samples to fungi analysis using impact method were taken in 30 b...

ABSTRACT Most office buildings in Germany have either no mechanical ventilation system or a centralized ventilation system with fresh and exhaust air supply. Within the last 10 years some projects using decentralized ventilation systems (DVS) came up. Common for this type of decentralised systems is that they take fresh air directly from outside through the facade via the DVS into the room. Wit...

HVAC stands for Heating, Ventilation and Air conditioning is the technology of automotive inside environmental comfort. system design based on thermodynamics, heat transfer fluid mechanics. very important everyone now a days in our project we are designing ventilation multilevel underground parking space, When cars move from area to outside space they release toxic gases fuels like carbon monox...

Evaluation of effectiveness of air handling systems for cooling and ventilation is either non-existent or based on thumb rules. There is lack of quantifiable metrics to assess the performance of these systems vis-à-vis the environment. With the advent of high density, mission-critical datacenters and high energy demands it is necessary to develop metrics to evaluate the effectiveness and effici...