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Design configuration: This is an important parameter, as it defines the method the Hysopt software will use to size the heat pump. There are three options:

Electric demandHeating and cooling demand (Highest) (Formerly known as electric demand): In this mode, the Optimiser will determine the size of the reversible heat pump based on the minimal electric power that is needed to satisfy both heating and cooling conditions. Based on the design heating and cooling flows, the required compressor power for each situation is calculated using the COP & Power tables. The situation that requires the highest compressor power is used to size the reversible heat pump.

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Cooling demand: In this mode, the Optimiser will determine the size of the reversible heat pump to meet the thermal installed capacity requirement for the cooling condition.

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The electric demand Heating and cooling demand (Highest) mode cannot be used when locking the parameters ‘Design power’, ‘Reference evaporator temperature’, or ‘reference condenser temperature’.

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The reversible heat pump is thus sized to meet the thermal installed capacity requirement for the heating condition. Note that this heat pump has an installed thermal cooling capacity of 133.5 kW in cooling mode.

Electric demandHeating and cooling demand (highest)

If the design configuration of the reversible heat pump BC is set to Heating and cooling demand (highest) (Formerly displayed as electric demand), the Optimiser will determine the size of the reversible heat pump based on the minimal electric power that is needed to supply to the compressor to meet the thermal installed capacity requirements for both the heating & cooling conditions.

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When set in electric demand Heating and cooling demand (highest) mode, the Optimiser does not simply look at the highest secondary design power for heating & cooling but at the most stringent demand for sizing of the heat pump.

When optimising the system components, we get the following result:

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The software now uses the heating reference conditions as if it were reference conditions for cooling. The software thus believes that the supply temperature of the cooling circuit will be -2 °C,, and that the worst-case ambient temperature in cooling mode will be 80 °C. At those reference conditions, it will size the heat pump to supply 50 kW of cooling power.

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Heating and cooling demand (highest)

When optimising the system components while keeping the same parameters locked in electric demand Heating and cooling demand (highest), we get the following result:

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The Hysopt software will not be able to perform its calculations. The electric demand Heating and cooling demand (highest) mode is meant to explore the optimal size of the reversible heat pump, such that both the heating & cooling conditions are met. It therefore cannot work once a design parameter is locked. So, to continue, you either have to unlock the design parameters, or you have to choose another design mode.

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