Heating Ventilation Air conditioning

Innovation and independence

There are sober, common sense, and profitable solutions to reduce the energy consumption of heating and air conditioning of tertiary premises and industrial sites. Calling on Clever Energies for an HVAC project means ensuring that all aspects of the project are taken into account, and in particular the comfort of the occupants. It also means benefiting from the experience of a Technical Director who has defined and implemented projects to reduce energy consumption in industry, and who shares best practices enriched by the reality on the ground. Together with the engineers of Clever Energies , let’s identify and concretize your priority energy savings deposits!

  • Energy balance of the existing.
  • Diagnosis of uses and perceived comfort.
  • Identification, prioritization, sizing and budgeting of HVAC improvements recommended, supplied and installed.
  • Costing and obtaining any CEEs in compliance with administrative formalism.

HVAC issues in the service sector and industry

  • In the tertiary sector, heating is the main use (43%) of final energy consumption.
    Natural gas represents 52% of the energy used for tertiary heating, ahead of fuel oil and electricity (19% each). (Source CEREN 2020)
  • In industry , final energy consumption was dominated in 2019 by gas (38%) and electricity (36%).
    Electricity accounts for more than half of the total expenditure (58%) in industrial energy consumption, while natural gas accounts for almost a quarter (24%), even though these two energies have an almost identical share in final energy consumption. (Source SDES 2021)
    In the industry, 36% of the combustions are unexploited, half of them at more than 100°C. This unrecovered heat, resulting from a production process, is called “unavoidable heat” and represents a major energy issue. Half of this source of fatal heat concerns the agro-food industry and the chemical industry. (Source CEREN 2020)
  • Finally, refrigeration consumes nearly 15% of electricity consumption in the industrial and tertiary sectors. (Source CEREN)

Given the evolution of energy prices in France, optimizing HVAC is a major economic challenge for any tertiary or industrial company. The impartial study of Clever Energies ensures the neutrality of the advice, and makes it possible to concretize deposits of energy savings by the following operations, piloted, followed and maintained after the works:


Destratification: In industry and in the tertiary sector, in heated buildings with a ridge height greater than 6m, hot air, less dense than cold air, stagnates at the ceiling if the air is not stirred. Several technical solutions exist to harmonize the overall temperature of the volume, and recover these calories wasted at height, taking into account the working conditions on site and the particularities of the building.

Récupération de chaleur fatale

Waste heat recovery: Waste heat (or waste heat) is heat generated by a process whose primary purpose is not the production of energy, and which therefore is not necessarily recovered. Capturing and then transporting this heat, which would be lost, to promote its use in thermal form makes it possible to recover the wasted fatal energy – typically to heat related premises, or even contribute to drying or preheating operations. Industrial sites, hospitals or data centers are relevant candidates for waste heat recovery. For example, during the operation of a furnace, only 20 to 40% of the energy of the fuel used constitutes useful heat, or 60 to 80% of potentially recoverable waste heat.

Refroidissement Adiabatique

Adiabatic cooling: Driven by the multiplication of heat waves and the summer comfort requirement of the RE2020 environmental regulations, technical alternatives to air conditioning - greedy in electricity, and subject to the dispersion of refrigerants regulated by the European F-GAS regulation - are deployed in the service sector and industrial sites. Adiabatic systems, for cooling (without guarantee of indoor temperature), or cooling (aiming to maintain a target temperature of +/- 1°C), are based on the natural and ancient principle of lowering the temperature hot air in contact with evaporating water. Easy to maintain, without refrigerant, sober in energy, compatible with rainwater, adiabatic systems, generally installed on the roof, are configured to avoid any risk of legionella and humidification of the ambient air, and allow reduce cold consumption, typically in offices, sports facilities, and industrial sites.


Air treatment: The health and economic issues related to indoor air quality are major – and the COVID-19 pandemic is a tragic illustration of this. Air quality monitoring is already mandatory for establishments receiving a sensitive public, such as schools. Solutions exist today to not only purify the air, but also surfaces, and above all to protect individuals from contamination linked to viruses. Photo-hydro-ionization technology makes it possible to charge the air with natural oxidants, harmless to living beings, which actively eliminate viruses and bacteria in the air and on surfaces. Tested against SARS-Cov-2 and a broad spectrum of viruses, bacteria and pollutants in the United States by the Innovative Bioanalysis and Biosecurity Research Institute laboratories, this technology has been validated in France by Eurofins at the request of Clever Energies for its effectiveness in the active suppression of formaldehyde in the air.