Calculate your annual energy savings by entering the following information:

Your annual energy savings are: kWh


Closed loop water systems can be found in HVAC systems for various applications, including heating, cooling, and ventilation. These systems use water as a heat transfer fluid to transfer heat or cold from one area to another. In a closed loop system, water is circulated through a piping system and exchanges heat with air or other fluids in heat exchangers or cooling coils. The water is then returned to the system to continue the cycle.

Some examples of HVAC applications that use closed loop water systems include:

  • Chilled water systems for air conditioning and cooling
  • Hot water systems for heating
  • Geothermal heat pump systems for heating and cooling
  • Heat recovery systems for ventilation


Closed loop water systems are preferred over open loop systems because they minimise water usage, reduce the risk of contamination, and allow for more precise temperature control.


In some cases, reducing water supply pressure in a building’s HVAC system can have a positive impact on energy efficiency and environmental sustainability without affecting thermal comfort. This is because the reduced pressure results in a lower flow rate, which reduces the energy required to pump water through the system.

The positive impacts of reducing water supply pressure can include:

  1. Energy savings: Lower water flow rates mean that less energy is required to pump water through the system. This can result in significant energy savings and reduce a building’s overall carbon footprint.

  2. Cost savings: Reduced energy consumption can lead to lower utility bills and operational costs.

  3. Increased equipment lifespan: By reducing the strain on HVAC equipment, such as pumps and pipes, lower water pressure can help extend their lifespan and reduce maintenance and replacement costs.

  4. Environmental benefits: Lower energy consumption means reduced greenhouse gas emissions and a smaller environmental footprint.

It’s important to note that reducing water pressure should only be done when it can be done without negatively impacting thermal comfort or building operations. Careful monitoring and testing are required to ensure that the change does not lead to issues like reduced water flow to critical equipment or discomfort for building occupants.


  • Input the required data in the form fields
    • Flow rate (example: 100 L/S)
    • Original pressure (example: 150 L/S)
    • New pressure (example: 150 kPA)
    • Efficiency (example: 50%)
    • Operating hours (example: 8760 for 24/7 operation)
  • Click the “Calculate” button.
  • The annual energy savings will be displayed in kWh in the result area.
  • To copy all the inputs and the result, click the “Copy All” button, and the data will be copied to the clipboard.
  • Paste the copied data wherever required.


The preliminary calculations for energy efficiency provided on this website are intended to serve as a guide only. They are not to be considered as a decision tool for making capital investments or for detailed design purposes.

While we make every effort to ensure the accuracy and reliability of the information presented, we cannot guarantee the completeness or applicability of the results obtained from these preliminary calculations.

It is important to note that actual energy efficiency and savings may vary based on factors such as equipment selection, building design, operating conditions, and other variables not accounted for in these preliminary calculations.

Therefore, we strongly advise that any decision to invest in energy efficiency improvements should be based on a thorough analysis conducted by a qualified professional. We would be happy to help you in this aspect if you require.

We disclaim any liability for any damages or losses arising from the use or reliance on the results of these preliminary calculations.