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A one-family dwelling has six 3-kW electric wall heaters (with individual thermostats) and five room air conditioners. Two air conditioners are rated 10.5 amperes at 230 volts, and the others are rated 7.2 amperes at 115 volts. A service calculation is being performed, using the optional method. How many volt-amperes should be included (after demand factors) for the heating and air conditioning

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ogorwyne

The volt amps that should be included (after demand factors) for the heating and air conditioning is 23.61678 kva.

How to solve for the volt ampere

If the heater coil is resistive the total KW thast is consumed by this bheter is given as

6 * 3 = 18KWA

We assume the connection that we have here to be in three phases. The two air conditioners are rated as

10.5 amp and 230 volts

√3 * 230 * 10.5

= 4.18278 KWA

KVA of three    =

√3 *7.2 * 115

= 1.434

The total kva = 18 + 4.18278 + 1.434

= 23.61678 kva

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