New Release CEM Energy Management Questions

To calculate the cost of heating water using natural gas:

Step 1: Compute Energy Required to Heat the Water

Given:

Mass of water= 500 L = 500 kg

Temperature rise (ΔT)= 50°C - 18°C = 32°C

Specific heat of water (Cp)= 4.2 kJ/kg-°C

Energy Required (Q)=m×Cp×ΔT

=500×4.2×32

=67,200 kJ=67.2 MJ

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To calculate the additional cost due to a power factor of less than 100%, follow these steps:

Step 1: Convert Real Power (kW) to Apparent Power (kVA)

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Step 2: Compute Additional kVA Due to Power Factor

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All electrical energy consumed by the lamp is converted into heatwithin the space, either as direct heat or as waste heat from the light source.

In a windowless office, no energy escapes as light.The light energy that is emitted eventually turns into heat through absorption by surfaces.

Thus, the correct answer isC. 100%.