Test objective name

Sizing HPand Storage To Maximize Self Consumption

Author / organization

Sami Ghazouani and Mickael Rousset

Short description

Optimizing design of heat storage and heat pump in a coupled heat and power network to maximize self-consumption

Present use / development status

Test objective

optimization

Description incl. justification

The test case aims to optimize the design of a district’s infrastructure in order maximize the use of renewable energy sources – such as waste heat from a greenhouse and solar PV – in the energy mix of the district’s energy supply (thermal and electrical).

System configuration

Collectopia (see deliverable D2-3, Appendix E)

Use case

System Under Test

Used abbreviations:
• COP: coefficient of performance
• DHW: Domestic Heat Water
• PV: Photovoltaics
• SC: Space Cooling
• SH: Space Heating
The greenhouse is represented by its surface as well as heating and cooling demands (depending on the ambient temperature). These demands are not simultaneous. They can be met by local heating/cooling utilities or the district heating network.

The residential buildings are represented by their surface as well as heating (SH, DHW) and electricity demands. The heating demand can be met by a local heating utility or the district heating network. The electric demand can be met by the PV production or via the electricity grid.
Tertiary buildings are represented in an analogous way as the residential buildings.
Solar PV panels are characterized by their surface and nominal electricity production capacity.
The district heat network is characterized by two temperature levels (high and low temperatures). Its sources of energy are the greenhouse, the heat storage and the heat pump. If needed, it can feed the greenhouse, the heat storage and the buildings (residential and tertiary).
The heat pump is represented by its power, two temperature levels and its COP. Its power source can be the PV production or the electricity grid.
The heat storage is characterized by two volumes and temperature levels (hot and cold). Its main use is to store energy produced by the greenhouse, and if needed by the heat pump to feed the buildings through the district heating network.

Object Under Investigation

• Heat storage: Volumes and temperature levels (Vstore, Vextract, Tstore)
• Heat pump: Temperature levels and power intake (Tevap, Tcond, Power)
•  District heating network: Temperatures (Tgo, Treturn)

Function Under Investigation

The efficient use of local energy, i.e., electricity produced by solar PV panels and greenhouse heat waste.

Model Validation

Objective Function / Target Metrics

Sizing of the long-term storage tank to minimize exergy imports into the district (see deliverable D4.2, Appendix C.2, page 37).
The objective function is to minimize the imports of exergy coming from grids. The exergy is a reflection of the energy, taking into account its quality. It can concern both electrical and thermal grids. In the system configuration under study, a storage tank is sized in order to reach this objective. In the related use case, the storage tank is used to separate the periods of energy production from the periods of energy consumption.

Acceptable test result