Final answer:
The fire load in a building pertains to the quantity of combustible materials and affects fire intensity and duration. Specific fire flow requirements for residential highrise occupancies with a low fire load depend on many factors. Fire hose calculations are informed by fluid dynamics and vary based on fluid properties, though differences between fresh and salt water are often negligible in firefighting.
Step-by-step explanation:
The term “fire load” refers to the amount of combustible material present in a building, which contributes to the intensity and duration of a fire. For residential highrise occupancies, the fire load is considered low when there is a limited amount of combustible material present. However, the part of the question asking for the specific fire flow requirement for a low fire load in residential highrise occupancies does not provide enough information to answer precisely, as the required fire flow rate is determined by various factors such as building size, construction materials, and fire protection systems in place.
The calculation of fluid speed in a fire hose and the flow rate in cubic meters per second are part of the hydraulic calculations that form an essential aspect of fire protection engineering. For fire hose calculations, formulas based on the principles of fluid dynamics are used. For example, using the continuity equation and the cross-sectional area of the hose, you can determine the fluid velocity given the flow rate and vice versa. The properties of the fluid, such as density and viscosity, can also affect these calculations, hence the answer might slightly vary if salt water were used instead of fresh water, but for most practical firefighting purposes, this difference is negligible.