Ambient Loop District Heating – Worth the Energy?

Ambient Loop District Heating – Worth the Energy?

15 October 2020
Strategic positioning of meters and accurate billing of an ambient loop heating and cooling system has potential to realise low to negative carbon opportunities.

By monitoring and targeting the energy produced, consumed and traded/exchanged within an ambient loop system, energy service companies, building owners and tenants would benefit from potential cost saving opportunities.

Sweco’s Energy and Sustainability team along with Trevor Leitao (Senior BMS Engineer) and Jessica Kvist (Senior Mechanical Engineer) are in the process of delivering a solution for accurate metering and billing of a communal synthetic peer to peer thermal trading system. Several water source heat pumps serving tenants connect to the building’s ambient heating and cooling loop.

Metering and Billing Model
Sweco are in the process of modelling a method of accurately billing the tenants for use of the ambient loop served by the landlord air source heat pump and associated circulation pumps.

For each water source heat pump within the tenant’s demise, the model uses data from bi-directional heat meters provided at tenant branch connections in order to determine the tenant’s water source heat pump mode of operation.

At any given time, the water source heat pumps could be in one of the three following modes of operation:

• Heating Mode: Utilising energy from the ambient loop for heating
• Cooling Mode: Rejecting energy into the ambient loop for cooling
• Passive Mode: No heating/cooling demand within the apartment

The final output of the model is a break down of apportioned costs to each tenant for using the landlord air source heat pump and associated circulation pumps, calculated using the energy consumption and operating mode data.

Potential Energy, Carbon and Cost Savings
Modelled data highlighting periods where energy is traded between apartment heat pumps can be used to determine opportunities for cost savings and reduction in the overall operational carbon footprint.

This also enables opportunities to incentivise tenants as part of promoting energy efficiency and carbon savings.

system schematic.jpg

System schematic showing flow meter and temperature meter locations

For more information, please contact;
Kartik Amrania - Head of Building Sustainability Department
kartik.amrania@sweco.co.uk 
+44 1628 598 382