Heat storage systems 2. Calculate the amount of heat that can be taken to air preheating in ventilation equipment in one day · air volume flow rate is 2.8 m 3 /s at time 6.00 - 22.00 · at nights air volume flow rate is 1.4 m 3 /s · air temperature before preheating is -20 °C · air temperature after preheating is -2 °C at daytime · air temperature after preheating in 0 °C at night · specific heat capacity of air is 1.0 kJ/(kg°C) · air density is 1.2 kg/m 3 · Energy (3,6 MJ is equal to 1 kWh)

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Heat storage systems

Calculate the amount of heat that can be taken to

air preheating in ventilation equipment in one day

air volume flow rate is 2.8

³/s at time 6.00 - 22.00

at nights air volume flow

rate is 1.4 m

³/s

air

temperature before preheating is -20 °C

air

temperature after preheating is -2 °C at daytime

air

temperature after preheating in 0 °C at night

specific

heat capacity of air is 1.0 kJ/(kg°C)

· air density is 1.2 kg/m³

· Energy (3,6 MJ is equal to 1 kWh)

1236 kWh

✅

753

kWh

❌

1505

kWh

❌

1183

kWh

❌

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