Highrise Services Calculation 1

First of all, these are the general information that you have to have.

1. Plot ratio of the site
2. Allowable plinth area of the site
3. Open space of the site
4. Total site area
5. Proposed quantity of floor (does not include the number of basement/s)

Example,
Total site area = 8371.76m²
Allowable plinth area = 60%
Open space = 40%
Plot Ratio = 1:7
Quantity of Floor = 34 storeys

1. Gross Floor Area (GFA)

= Site Area x Plot Ratio
Example,
8371.76m² x 7
= 58602.32m²

2. Plinth Area

= Allowable plinth area x site area
Example,
60% x 8371.76m²
= 5023.06m²

3. Size per floor

GFA / Quantity of floor
Example,
58602.32m² / 34
= 1723.60m² (does not determine the size of basement/s)

* The size per floor usually be determined first based on the space requirements set out by the client.

4. Net Lettable Area (NLA)

GFA - 30%GFA or 70% of GFA
(30% of GFA is the area reserved for services)
Example,
58602.32m² - 30%(58602.32m²)
= 58602.32m² - 17580.70m²
= 41021.62m²

5. Maximum number of occupants

= NLA / area per person
(Let say 10m² per person, please refer Neufert for this)
Example,
41021.62m² / 10m²
= 4102 person

* Number of occupants usually be determined based on the building program and the space planning.

6. Maximum number of occupants per floor

= Maximum number of occupants / Quantity of floor
Example,
4102 / 34
= 410 occupants per floor

7.Number of Car parking space

NLA / Specified number by the local authority
(125 is the number specified by the local authority, in this case it is the number provided by the Johor City Council in the Local Development Plan)
Example,
41021.62m² / 125
= 328 parking

8. Number of Motorcycle parking space

30% x Car parking space
Example,
30% x 328
= 98 parking

*Note that this calculation is just a general guideline, it DOES NOT have to be precisely followed.

Highrise Services Calculation 2

Second of all, these are the general information that you have to have.

1. Proposed quantity of floors
2. Area of every floor
3. Area designated per person
4. Number of occupants
5. Groos Floor Area (GFA)
6. Net Lettable Area (NLA)
7. Number of occupants per floor

Example,
1. 34 storeys
2. 1723.60m²
3. 10m²
4. 4102 person
5. 58602.32m²
6. 41021.62m²
7. 121 person

1. Num. of passengers in one lift cart

75 % x number of occupants
Example,
= 75% x 4102
= 3077 people

2. Num. of passenger in one lift cart within 30 minutes

(30 minutes x 60 seconds x assumed number of person per lift) / 105
(assume 15 people per lift (65kg per person))
Example,
= (30 x 60 x 15) / 105
= 257 people

2. Num. of lift required

Number of person in one lift cart / number of passenger in one lift cart within 30 minutes
Example,
= 3077 / 257
= 12 lifts

3. Size of AHU per floor

(2.5 % x GFA) / Quantity of floors
Example,
=(2.5% x 58602.32m²) / 34
= 43.08m²

4. Plant Room

3% x NLA
Example,
= 3% x 41021.62m²
= 1230.65m²

5. Usage per Floor

Number of occupants per floor x 40 liters
(assume 40 liters per person for 24 hours)
(assume 20 liters for sanitary)
Example,
= 121 x 40 liters
= 4840 liters

6. Usage of water for the whole building

Usage per floor x Quantity of floors
= 4840 liters x 34
= 164560 liters
= 165 cubic / 1.2
= 137.5m²

7. Backup for water supply

(usage per floor x 10 hours) / 24 hours
Example,
=(164560 x 10) / 24
= 68566.67 liters

8. Total water supply

Usage of water per building + backup water supply
Example,
164560 liters + 68566.67 liters
=233126.67 liters

9. Suction tank

1/3 of total water supply
Example,
= 1/3 x 233126.67 liters
= 77708.89 liters
= 78 cubic/1.2
= 65m²

10. Water tank

2/3 of total water supply
Example,
= 2/3 x 233126.67 liters
= 155417.78 liters
= 155 cubic / 1.2
= 129.17m²

11. Fire Fighting

a) Wet Riser Tank
= 45000 liters (2 stage)

1st stage (Basement)
= 1/3 of wet riser tank
= 1/3 x 45000 liters
= 15000 liters
= 15 cubic/1.2
= 12.5m²

2nd Stage (Roof Top)
= 2/3 x 45000 liters
= 30000 liters
= 30 cubic / 1.2
= 25 m²

b) Sprinkler Tank
= 45000 liters
= 45 cubic / 1.2
= 37.5m²

c) Hose Reel Tank
= 45000 liters
= 45 cubic / 1.2
= 37.5m²

*Note that this calculation is just a general guideline, it DOES NOT have to be precisely followed.