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Restaurant: Heat recovery from condensers to heat domestic hot water in a restaurant

Energy
Commerce
[ Detailed version of the measure ]
Last update: 13/09/2024
  • Possibility of assistance
  • Subsidies available
  • Innovative solutions

To make this measure more effective and tailored to the specific context of your company, we recommend that you first perform an overall analysis of your energy situation.

Replacement and centralisation of cold production units with a variable speed compressor

A refrigeration cycle works by drawing heat from the evaporator and discharging it to the outside (condenser). The project’s idea consists in recovering this heat to be discharged to preheat domestic hot water (DHW), which is necessary in every restaurant. The exchanger is placed between the compressor and the condenser of the cooling unit.

In practice, recovery can be implemented in three different ways:

  • Via external exchanger: an exchanger is connected on one side to the compressor outlet and on the other to the hot water tank (partial recovery).
  • Via internal exchanger: a “desuperheater” through which the refrigerant flows are inserted at the bottom of the hot water tank upstream of the condenser.
  • Via condensation water collector: all the refrigerant is condensed inside the hot water tank (total recovery).

By installing this technology, which has been available on the market for more than 5 years, the company can save significantly on its energy bills, and even cut its hot water consumption, which will result in reducing its carbon footprint (the benefits will depend on the initial mode of domestic hot water production). However, implementing this measure can be complex and taking into account energy costs alone may not be sufficient for a return on investment. It also requires temporary production shutdown during the technical installation stage.

Energy and environmental impact

The two joint positive effects are:

  • Energy gain on DHW production due to the recovery of energy discharged outside (= waste heat).
  • Environmental gain because final consumption to produce DHW is lower than the initial consumption; positive impact on carbon footprint, in particular if DHW was initially produced using a fossil fuel.

State subsidy application

State subsidies

Please note: any application for government or non-government subsidies must comply with the “incentive effect”, subject to compliance with the subsidy conditions.
To ensure that the ‘incentive effect’ is respected, no binding commitment (signing a quotation; paying an advance) may be made BEFORE submitting the application file or receiving the agreement in principle from the State or the electricity and natural gas supplier following an application for subsidies.

Temporary environmental impact aid

Extended “SME Packages Sustainability” aid scheme, to give companies greater incentives to invest in measures that significantly improve their environmental impact. Investments under this climate protection measure amount to 70% for small enterprises, 60% for medium-sized enterprises and 50% for large enterprises, for projects costing more than €7,500, with a maximum subsidy of €100,000.

SME Packages – Sustainability

Flat-rate subsidy of €5,000 for small and medium-sized companies for projects to reduce their environmental impact, costing between €25,000 and €6,650 excluding VAT.

Environmental protection scheme – Investment aid for the protection of the environment

  • Verification of company eligibility and costs: General Directorate for Industry, new Technology and Research
    • Support in drawing up the subsidy application file prior to submission to the Ministry of the Economy

N.B. State subsidies cannot be combined for the same project

Subsidies from electricity and natural gas suppliers

Since 2015, natural gas and electricity suppliers are required to make energy savings for consumers under the obligation scheme. Since then, energy suppliers have been offering support and advice, as well as subsidy programmes for consumers to implement energy efficiency measures.

The following suppliers offer this service for companies:

N.B. Supplier subsidies can be combined with any state subsidies for the same project.

Implementation aid

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I would like more information on:

  • Fit 4 Sustainability
  • Government subsidies
  • Support
  • Identifying partners

I would like more information on:

  • Klimabonus subsidies or photovoltaic and electromobility subsidy programmes
  • A technical aspect of the measure
  • A specific tool
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