Mine Ventilation and Cooling Vocabulary Flashcards

Vocabulary flashcards covering mine cooling requirements, heat loads, shaft velocities, airway dimensions, and mining production tonnage formulas from the lecture transcript.

Underground Cooling Requirement

The net cooling capacity needed underground, calculated as $\text{Heat load} - \text{net cooling capacity of air}$.

Service Water Consumption Assumption

The standard design assumption for service water usage, equal to $1\,\text{ton } H_2O / \text{ton rock mined}$.

Service Air Mass Flow Assumption

The assumed airflow mass flow rate factor required for cooling, set at $4\,kg/s$ per $ktan$ of rock mined per month.

Reject Temperature

The target or baseline discharge air temperature from the mine, specified as $27^\circ C$ on psychrometric charts.

Refrigeration Required (kW)

The total cooling duty calculated in $kW$ as $\text{Total heat load} + \text{heat added by air}$ or $\text{Total heat load} - \text{cooling capacity of air}$.

Graph F

A psychrometric chart used to determine heat production when the specific heat load factor is not explicitly given.

Fissure Water Heat Transfer

Heat added to mine air by fissure water, calculated using $q = m \times Cp \times \Delta T$, where $\Delta T = \text{VRT} - \text{Reject temperature}$.

Diesel Machinery Heat Factor

A factor commonly used to estimate heat load from diesel equipment, given as $1.5\,kW$ per rated $kW$ of diesel power.

Diesel Fuel Heat Calculation

The heat load formula based on calorific value as detailed in Le Roux Notes p. 160, defined as $\text{Heat} = \text{consumption} \times \text{calorific value}$.

Fan Heat Contribution

The heat load rule stating that $100\%$ of the total rated power ($kW$) of ventilation fans enters the mine air directly as heat.

Motor Inefficiency Heat Contribution

The heat added to mine air by hoist and pump motor inefficiencies, equal to the rated kilowatts lost to inefficiency.

Auto-compression

The thermodynamic heating process where downcasting air adds heat to the air stream at a rate of $9.79\,kJ/kg$ per $1000\,m$ ($0.979\,kJ/kg$ per $100\,m$).

Auto-decompression

The thermodynamic cooling process where upcasting air removes heat from the air stream.

Standard Rock Density

The mass density of mined rock used in tonnage calculations, specified as $2.78\,tons/m^3$ or $2780\,kg/m^3$.

Stope Tonnage Formula

The calculation for stope tonnage, defined as $\text{Face Length } (FL) \times \text{Face Advance } (FAv) \times \text{Stope Width } (SW) \times \text{Rock Density}$.

Development Tonnage Formula

The calculation for development tonnage, defined as $\text{Face Area} \times \text{Face Advance} \times \text{Rock Density}$.

Optimal Equipped Upcast Shaft Velocity

The economic air velocity range for an equipped upcast shaft, specified as $18\text{--}22\,m/s$.

Optimal Equipped Downcast Shaft Velocity

The economic air velocity range for an equipped downcast shaft, specified as $10\text{--}12\,m/s$.

Unequipped Downcast Shaft Velocity

The standard air velocity for an unequipped downcast shaft, specified as $8\,m/s$.

Intake Airways Specifications

Standard intake airways with typical cross-sectional areas of $(3 \times 3) = 9\,m^2 - 12\,m^2$ and standard air velocity of $4\,m/s$.

Return Airways (RAWS) Specifications

Standard return airways with typical cross-sectional areas of $(4 \times 4) = 16\,m^2 - 20\,m^2$ and standard air velocity of $10\,m/s$.

Bulk Air Cooler (BAC) Airside Capacity

The cooling capacity on the air side of a surface Bulk Air Cooler, given by $q = M \times \Delta S$.

Bulk Air Cooler (BAC) Waterside Capacity

The cooling capacity on the water side of a surface Bulk Air Cooler, given by $q = M \times Cp \times \Delta T$.