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# Calculating Mass Flow Rate In Heat Pump

## Calculating Mass Flow Rate In Heat Pump

(OP)
Hi,

I am trying to calculate the mass flow rate of water (m) in a heat pump cycle. I currently have the power output required (200 kW) , temperatures (T1 = 20degC, T2 = 80degC) and enthalpies for the system (h1, h2, h3 & h4 - can provide). From what I understand m = power/(heat capacity * deltaT), however I am struggling to implement these values to obtain a mass flow rate.

I would be very grateful for any tips you can provide! Also, I can provide more information if required.

### RE: Calculating Mass Flow Rate In Heat Pump

Hi!

To calculate the mass flow rate of water in a heat pump cycle, we need to know the heat capacity of the water and the temperature difference between the inlets and outlets of the system.

The formula to calculate the mass flow is:

m = Power / (Heat capacity * Delta T)

Therefore, with the data you have we can calculate the mass flow of water as:

m = 200 kW / (4.18* kJ/(kg °C) * 60 °C)
m = 0.794 kg/s

*The heat capacity of water is 4.18* kJ/(kg °C*

So, the mass flow of water in the heat pump cycle is 0.794 kg/s.

I hope it helps!

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