Energy-efficient replacement of the cooling system reduces costs and emissions for luxury hotel

A Grundfos Energy Check for the JW Marriott Bucharest Grand Hotel proposed that their existing five 37kW pump system could be replaced by just three 18.5kW Grundfos NBE pumps, frequency converters and a smart controller to save significantly on energy, costs and emissions, in a payback time of under a year. 

It scarcely seemed possible that three 18.5kW pumps could replace our five 37 kW pump cooling system, but it is!
Gelu Burcur, Technical Director JW Marriott Bucharest Grand Hotel

When Grundfos Romania undertook a complimentary Energy Check assessment for the luxury JW Marriott hotel in Bucharest, the report highlighted their existing cooling system of five 37kW pumps could be replaced with just three intelligent, highly efficient 18.5kW Grundfos NBE pumps. The proposal projected a payback time of less than a year, significant annual energy and cost savings, and a considerable reduction in the hotel’s carbon emissions. With the go-ahead to proceed, Grundfos provided full project assistance throughout, installing a turnkey solution that is on course to match all projections.

Before: The original system was a tight fit in the hotel’s technical room.

"We are very pleased the new system gives us much more control and delivers on the efficiencies the original Energy Check report proposed.” - Gelu Burcur, Technical Director, JW Marriott Bucharest Grand Hotel

The situation

After twenty years, the cooling system installed on the top floor of the JW Marriott Bucharest Grand Hotel, a 5-star luxury hotel in Bucharest, was beginning to show its age.

Not only was the system becoming increasingly difficult to maintain, but with its five 37kW pumps needing diaphragms to reduce flow, it was evident the system was oversized and consuming more energy than was necessary, especially in the context of steeply rising global energy prices.

Having built up a trusting relationship over five years with the ad-hoc supply of individual pumps and consultancy, the hotel agreed to Grundfos’ offer of a complimentary Energy Check to investigate in more detail the costs of the existing cooling system and potential savings that could be made with energy-optimised replacement equipment. 

A Grundfos Energy Check can highlight opportunities for significant savings in energy, costs and carbon emissions. We’re delighted the team at JW Marriott Bucharest Grand Hotel trusted us to implement the savings we identified for their cooling system.
Emil Serban, Senior Aftermarket Sales Engineer Grundfos

The solution

Grundfos Energy Check is an assessment of an existing pump system that identifies opportunities to reduce operating costs and increase pump efficiency. Grundfos engineers used data collected from the equipment and information provided by the hotel’s engineers to create a precise overview of the system that presented striking savings opportunities.

The Energy Check investigation found that the cooling system could in fact be run on a system of just three Grundfos 15kW NBE pumps equipped with frequency converters and a CU 352 smart controller unit. The JW Marriott technical team requested 18.5kW pumps, and on this basis, the Energy Check report found the hotel could expect:

  • Energy savings of 180,619 kWh per year
  • Cost savings of €54,186 per year
  • Payback time of 0.9 years
  • Emissions reduction of 61.95 CO₂ t/year

During: The Grundfos team worked at night replacing the existing valves, to test and ensure the Energy Check project proposal would work as planned.

After: Replacing the five original pumps with three Grundfos NBE pumps and MPC controller brought a new level of efficiency to the cooling system.

The outcome

Grundfos delivered a turnkey solution, taking responsibility for all stages from the initial measurement and technical proposal, the dismantling of existing pumps and components, to the installing and commissioning of the fully energy-optimised system of new pumps, hydraulic accessories and control cabinet.

The frequency converters are controlled by a smart pump controller unit for maximum efficiency, ensuring the newly-operational system is, in its first year, running according to the Energy Check’s projected energy and cost savings.

In addition, the smart pumps and controllers add a new level of intelligence, not only transmitting data to the BMS, but controllable from there as well, making the system operation more straightforward for the customer.

After a successful project implementation, the JW Marriott and Grundfos teams are looking forward to future close collaboration. Work has already begun on a new maintenance project, with a programme of ongoing pump replacements agreed and two new pumps ordered. There are opportunities for Energy Check investigations into the hotel’s other water systems.

Grundfos has helped us bring in a new, energy-optimised system that delivers considerable savings and helps us meet the environmental goals of our business. Our collaboration has been a great success and we look forward to working together on future projects.
Sorin Carstian, Chief Engineer, JW Marriott Bucharest Grand Hotel

Grundfos supplied:

  • 3 x Grundfos NBE end-suction close-coupled EN733 standard pumps
    92960886 – NBE 125-315/275AXEF2AESBQQEPW3
  • 1 x Control MPC Series 2000 controller 96781413 – 3 pump variant.
  • 1 x Differential pressure sensor 96611527 – DPI/--0-6.0b/1/G/ D.900-B/V-5/B/02B/SD-1 

Related products

Find products from Grundfos related to this subject.

Other related cases

Read related stories from customers who have also benefited from a Grundfos solution.