Load Calculation

8.2.5.1 Heat and Contaminant Emission

An estimate of heat and contaminant emission to the room air is needed early in the design process. Table 8.4 presents typical parameters of interest.

At a later stage in design the position and characteristics of releases are needed such as

Heat, described as power, as temperature on the described surface, or as advection of heat along with substance flowing out of the production process.

Momentum and density of flow released from openings and from processes.

Moisture, as emission of water and vapor from the process.

Contaminant emission, such as mass flow of different substances flowing out of the process.

Time

Period

(h)

Accumulated

Time

(h)

Work description

Breathing zone position

Activity

Level

(met)

Pulm1 v. rate (kg/h)

X(m)

Y(m)

Z(m)

Activity

Description

0.5

0.5

Adjusting machinery

27.7

18.6

1.65

Light work

2.0

1.46′

0.5

1.0

Tube-forming quality check

22.9

19.4

1.65

Standing

1.2

0.88

0.5

1.5

Tube-forming quality check

22.9

19.4

1.65

Standing

1.2

0.88

0.5

2.0

Resting outside production hall

Seated

1.0

0.73

0.25

2.25

Checking paint station

17.4

18.6

1.65

Standing

1.2

0.88

0.25

2.5

Checking paint station

17.4

18.6

1.65

Standing

1.2

0.88

0.5

3.0

Checking paint station

17.4

18.6

1.65

Standing

1.2

0.88

0.5

3.5

Checking paint station

17.4

18.6

1.65

Standing

1.2

0.88

0.5

4.0

Checking paint station

17.4

18.6

1.65

Standing

1.2

0.88

0.5

4.5

Checking paint station

17.4

18.6

1.65

Standing

1.2

0.88

0.5

5.0

Checking paint station

17.4

18.6

1.65

Standing

1.2

0.88

0.5

5.5

Furnace adjustment

20.5

18.9

1.65

Light work

2.0

1.46

0.5

6.0

Furnace adjustment

20.5

18.9

1.65

Light work

2.0

1.46

0.5

6.5

Resting outside production hall

Seated

1.0

0.7.3

0.5

7.0

Resting outside production hall

Seated

1.0

0.73

0.5

7.5

Checking paint station

24.8

19.4

1.65

Standing

1.2

0.88

0.5

8.0

Checking paint station

24.8

19.4

1.65

Standing

1.2

0.88

‘Pulmonary ventilation can be found from Qv =•> G.0070M (kg/h). M = 104.4 W for an adult person at 1 met.

CHAPTER 8 ROOM AIR CONDITIONING TABLE 8.4 Heat and Contaminant Release to the Air in an Industrial Hall

Source

Position

X, r, z (m)

Power

(W)

Contaminant

(kg/s)

Comment

Furnace 1

21, 18, 1.4

.30.0 x 10-!

Continuous / 70%

Ni local

Furnace 2

23, 18,1.4

10.0 x 10s

_

Continuous /’ 60%

In local

Furnace 3

26, 18, 1.4

17.5 x 101

Continuous / 80% exttact

In local

Painting station

17, 19, 1.4

Paint aerosol 4 x 10ft

Substance / TLV =

X mg/m3

Press station

28, 18, 1.5

OiJ vapor 1 x 1 0-*

Substance / TLV —

Y mg/m3

Detailed list of the actual contaminant, including properties, health effects, and odor.

It is also useful to make a steady-state balance with respect to airflow, heat flow, and mass flow of substances into and out of the enclosure. See Chapter 7 for details with respect to calculation of heat and contaminant emission.

Assume the use of mechanical ventilation with full mixing ventilation in the room, and calculate a rough estimate of ventilation airflow found by as­suming dilution of contaminants released to the room air to one-third of the TLV level given for the substance in question.

8.2.5.2 Room Envelope Characterization

In order to analyze the conditions for air conditioning, the following in­formation must be specified for the industrial enclosure:

Geometric dimensions.

Position and direction, U-value, solar factor, and thermal mass of the different construction elements.

Position of openings for possible infiltration or exfiltration.

Outline of expected opening of doors, windows, and hatches.

Posted in INDUSTRIAL VENTILATION DESIGN GUIDEBOOK


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