RACA Journal January 2024 | Page 33

Project measured by the level of comfort , making the environment conducive to end-users .

1

DESIGN CRITERIA The following design criteria were applied in the design and configuration of all technical systems and services :

• Adequate capacity : load handling capabilities to meet present and future requirements .

• Reliability : under all circumstances .

• Adaptability : ability to cater for changes in future technology and expansion without infrastructure modifications .

• Flexibility : simplicity of operation and ability to cater for changes in occupancy .

• Maintainability : ease of maintenance and totally serviceable with locally available components .

• Cost-effectiveness : minimised capital and long-term operational costs .

• Energy efficiency : the systems must operate at optimum efficiency and minimum energy costs .

• Sustainability .

• Safety : the designs must be performed with due consideration given to the circumstances of the occupants and the environment .

• Security : consideration must be given during the design process to potential incidents of equipment vandalism and improper use and handling .

The HVAC system comprises two elements : the ventilation element and the temperature control element . The ventilation requirement is a compulsory element which is essential for building occupation . The rooms ’ ventilation design was guided

1 . TABS Chiller . 2 . Temperature monitor .

by SANS 10400 Part O Table 1 , which tabulates the minimum air required which was used in heat load calculations . The room population was calculated in accordance with the class occupancy of each building as stipulated in Table 1 below .

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TABLE 1 : DESIGN POPULATION The below table tabulates the occupancy class for each room aligned to the population .

Class of occupancy of room , storey or portion thereof

A1 , A2 , A4 , A5 E1 , E3 , H1 , H3 , H4

Population

Number of fixed seats or 1 person per m 2 if there are no fixed seats 2 persons per bedroom