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title:Ventilation of Buildings 2Nd Ed.author:Awbi, H. B.publisher:Taylor & Francis Routledgeisbn10 | asin:0415270553print isbn13:9780415270557ebook isbn13:9780203634479language:EnglishsubjectVentilation.publication date:2003lcc:TH7653.A93 2003ebddc:697.92subject:Ventilation.

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1Human comfort and ventilation 1.1 Introduction

The purpose of a ventilation system is to provide acceptable microclimate in the space being ventilated. In this context, microclimate refers to thermal environment as well as air quality. These two factors must be considered in the design of a ventilation system for a room or a building, as they are fundamental to the comfort and well-being of the human occupants or the performance of industrial processes within these spaces. In a modern technological society, people spend more than 90% of their time in an artificial environment (a dwelling, a workplace or a transport vehicle). As a result of the energy-saving measures which started in the early 1970s these artificially created internal or indoor environments have undergone radical changes, some being positive and others negative. On the positive side, increased levels of thermal comfort have become fait accompli through improved thermal insulation and more advanced air-conditioning or heating system design. On the negative side, a deterioration of the indoor air quality has been experienced particularly among air-conditioned buildings [1]. Indeed, the term sick building syndrome is synonymous with the energy-saving era. These indoor air quality problems have been associated with poor plant maintenance, high concentrations of internally generated pollutants and low outdoor air supply rates.

The designers and operators of ventilation systems should be familiar with the comfort requirements and the quality of air necessary to achieve acceptable indoor climate. These require knowledge of the heat balance between the human body and the internal environment, the factors that influence thermal comfort and discomfort as well as the indoor pollution concentrations that can be tolerated by the occupants. In recent years, there has been a flux of published information, notably from Scandinavia and the USA, on these important issues of the built environment. The fundamental work that has been done on thermal comfort and air quality will be discussed in the first part of this chapter and more recent developments will be presented in the second part. This chapter will then become the fulcrum for the remaining chapters of this book.

1.2 Heat balance equations 1.2.1 Body thermoregulation

The primary function of thermoregulation is to maintain the body core, which contains the vital organs, within the rather narrow range of temperature which is vital for their proper functioning. The temperature control centre is the hypothalamus, a part of the

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Figure 1.3 The new effective temperature scale-lines of constant ET* [12].

model that was used to evaluate skin temperature, skin wettedness and evaporation rate within the zone of operation. A single-node model, such as the PMV/PPD model, is only valid under steady-state thermal conditions and to study transient effects or non-uniform thermal environments, two- or multi-node models are required. In the ET* scale, skin temperature, ts, skin wettedness, w, and clothing permeability index are used to define the thermal state of a person. The skin wettedness, w, is the ratio of the actual evaporative loss at the skin surface to the maximum loss that could occur in the same environment, i.e. when the skin is completely wet. This scale has been adopted by ASHRAE [12] to replace the old ET scale.

The ASHRAE effective temperature (ET*) is the dry-bulb temperature of uniform enclosure at 50% relative humidity (rh) in which people have the same net heat exchange by radiation, convection and evaporation as they do in varying humidities of the test environment. The ET* scale is based on equal air and operative temperatures, a clothing resistance of 0.6 clo, an air speed of 0.2 m s1, a sedentary activity ( 1 met) and an exposure time of 1 h. As shown in Figure 1.3 the new effective temperature for thermal comfort at these conditions and an rh of 50% is 23.5 C for w=0.06, i.e. no sweating. The figure also gives the values of ET* for different skin wettedness ratios. The principle used to develop ET* has been extended to higher levels of activities, representing higher levels of sweating. These are discussed in more detail in the ASHRAE Handbook of Fundamentals [12].

1.3.2 Operative temperature (to)

The ASHRAE Standard 55-1992 [9] uses the operative temperature as the environmental variable for evaluating thermal comfort at different activity and clothing insulation.

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Because equation (3.3) is not dimensionally homogeneous it lacks generality of application.

It has been suggested [4] that a quadratic form of equation (3.3) which is dimensionally homogenous provides a more accurate assessment of the flow through a crack. Such an equation has the form:

p = Q + Q2

(3.4)

where and are flow coefficients. The first term on the right-hand side of equation (3.4) represents laminar flow and the second represents turbulent flow. The former becomes more significant at low flow rates and the latter is more significant at large flow rates. The values of and can be obtained from experimental tests on the openings and values for some openings can be found in [5].

Both the power-law and quadratic forms of the crack flow equations have been used extensively in the calculation of air infiltration through a building envelope. These equations are normally written in a form suitable for a network of nodes, linking the external pressure points to the internal pressure points, suitable for solution by a computer. This is achieved by an iteration process in which an arbitrarily guessed internal pressure value is successively improved until a flow balance is achieved across the building fabric. This procedure is explained in more detail in Section 3.3.2. Liddament [6] has compared the air infiltration rates predicted by the power-law and quadratic equations with measurements in a family dwelling and showed that the two equations produced identical results for large pressure differences (p > 20 Pa) but the power-law was superior at low pressure differences, i.e. of the order existing under normal environmental conditions.

3.2.2 Wind pressure

The pressure difference across an opening or crack is the driving force for air leakage. This is produced by the action of wind and temperature difference (stack pressure) and by the operation of any mechanical ventilation systems that are present.

With reference to the static pressure of the wind upstream of an opening, the time-mean pressure due to the wind flow, pw, on to or away from a surface is given by:

pw = 0.5 Cpov2 Pa

(3.5)

where Cp = static pressure coefficient and v = wind speed at datum level, usually height of building or opening (m s1). The pressure coeffi