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Chilled-water networks · A Value Park brand

Value Smart: the right cooling, in the right place.

Not too cold, not too costly.

Most chilled-water networks run at 7/12°C out of habit, not necessity. We start by tuning what you already have, then compare technologies on a common basis, for your building rather than a typical one.

Start the assessment The two paths
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The starting point

7/12°C: the most common setting, rarely the right one.

A temperature regime is set at design stage and then left alone. Yet every degree of chilled water produced colder than needed is paid for in electricity. Your BMS data shows the regime actually in use, and comfort (temperature, humidity, air movement, occupancy) sets the limit not to cross.

For commercial buildings over 1,000 m², the French tertiary decree (Décret n° 2019-771 of 23 July 2019) requires energy consumption to be reduced. The chilled-water regime is one of the most direct levers.

Two paths

First the regime, then the installation.

1

Optimise the regime

Without touching the installation.

We raise the chilled-water supply temperature up to the limit set by comfort, starting from the regime actually in use.

How we go about it:

  1. Read the actual regimeRead-only BMS access shows the regime really in use, not the one displayed.
  2. Set the comfort limitTemperature, humidity, air movement and occupancy set the limit not to cross.
  3. Check the hydraulicsBefore raising the setpoint, we check that the network (decoupling, chiller sequencing) allows the savings to hold.
  4. Quantify the gainCosted savings, and tighter sizing of the equipment.
  5. Control continuouslyA water setpoint adjusted continuously, never fixed.
Up to 15%less electricity

Source: study carried out for CHU Sud Réunion hospital.

2

Change technology

By changing the cold source.

We compare every existing air-conditioning technology, whether or not we deliver it, for the same cooling demand, on whole-life cost and CO₂ emissions, using your building data. The ranking depends on your site: distance to the sea, installed capacity, condition of the equipment.

For example:

  • Air-cooled chillerThe comparison baseline: works anywhere, needs no water resource.
  • Water-cooled chillerRejects its heat into water rather than into the air.
  • Geothermal energyExchanges heat with the ground or an aquifer, at a stable temperature all year round.
  • Thalassothermal energyExchanges heat with near-shore sea water: free cooling when the water is cold enough, otherwise with a heat pump.
  • SWACDeep sea water, at around 5°C, cools the network directly through free cooling and replaces cooling production altogether.
Up to 90%less electricity

Source: target set for deep sea water cooling at CHU Sud Réunion hospital.

7,000 tof CO₂ avoided per year

The annual emissions of around 4,200 cars.

Source: estimate from the CHU Sud Réunion SWAC project study, i.e. 210,000 t over the contract term. Car equivalent: ADEME, Impact CO2 (average combustion car, 142 g CO₂e/km including manufacturing) and SDES (11,600 km driven per car on average in 2024).

Path 1 cuts the bill at low cost; path 2 cuts it further, in exchange for an investment.A correct regime lets you size the new installation as close as possible to actual demand.

The assessment

The more you tell us, the sharper the answer.

Answer what you know. Leave the rest blank: we will still tell you where you stand, and how precisely.

  1. An order of magnitude

    Floor area or the energy bill is enough.

  2. A costed estimate

    With the temperature regime, or access to your BMS.

  3. Your building in the tool

    With an annual load profile.

Start the assessment

−90 %target for air-conditioning electricity consumption

Our reference

CHU Sud Réunion hospital.

A hospital complex running around the clock in a tropical climate. The project, currently being delivered, was the subject of a technical paper in the Revue Générale du Froid, issue 1200 (June 2026), by Quentin Bessodes and André-Charles Mintsa Do Ango.

See the project Read the paper

Where it leads you

Value Smart tells you which of our services applies to you.

Path 1 builds on audit and refurbishment. Path 2 compares every existing air-conditioning technology, not only the ones we deliver.

If you don't know where you stand

Energy audit

Measure, model, quantify the savings. Often the first step of path 1.

If your chillers are ageing or use high-GWP refrigerants

Chiller refurbishment

Recover efficiency without replacing everything. The natural extension of path 1.

If your site is coastal or on an island

SWAC · Sea water air conditioning

Replace cooling production with deep sea water, when the path 2 comparison shows it comes out ahead.

If you are also looking at producing energy

OTEC · Ocean thermal energy

Our research programme on ocean thermal energy conversion.

By sector:HospitalsHotels & resortsData centresProcess industriesAirportsRetail & supermarkets
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Let's talk about your building.

The questionnaire takes a few minutes. Answer what you know, we do the rest.

Start the assessment