CASE STUDY

The Magistral Shopping Centre opened its doors in

2000 for the first time. In September 2011, the

centre was renovated over the course of eight

months to give it a whole new look – a 3,000 m²

extension and a rooftop car park.

Magistral opened its doors to visitors again at the

start of May 2012 with 70 stores and service

facilities. Rimi Supermarket takes up the largest

part of the centre. At weekends, the atrium

becomes a stage for concerts and shows.

R8tech began with Magistral Shopping Centre integration in the middle of summer 2019 and after

integration we continued with diagnostics. The integration itself took a couple of weeks even though

we had a delay due to lack of information which was promptly solved with a site visit. Thus, we were

able to provide the diagnostics report. Autopilot was launched at the end of summer and the building

was fully controlled by the end of September 2019. Thus, at the Case Study publishing date (March,

2020), we have the Autopilot results for 4 full months.

R8 Technologies All Rights Reserved Copyright 2020

Location: Tallinn, Estonia

Size: 15 300 m²

BMS: Siemens Desigo insight, Siemens Desigo CC (upgraded in 2020)

Number of floors: 3

Owner: EfTEN Capital

Magistral Shopping Centre

General Background

reduction on heating & electricity

14,6%

All savings achieved through optimisation of the HVAC and Building Management System by R8tech.

of operating in the building

4 monthsCO2 reduction

46 tons

QUICK FACTS

Magistral Shopping Centre is a three-story building where the 0-floor is partially built into the

landscape. The building is heated with district heating. Most of the rooms are air heated with

ventilation. Only some technical backrooms and stairways have radiators. Every entrance has its own

air curtains.

There are 2 chillers for cooling and one of them is with a free cooling option. Cooling energy is used for

ventilation coils and a fan coils which are in most of the rooms.

Building has 8 air handling units (AHUs) and they all have heating & cooling coils and heat recoveries

(6 rotary and 2 glycol). Mixing dampers have been installed into 6 AHUs.

All the rooms that have fan coils have also room controllers. Building itself is quite well equipped with

sensors/controllers and there are very small number of areas without any data.

Magistral Shopping Centre was a great challenge for R8tech. Magistral’s technical team had already

been proactively looking for ways to lower the energy consumption by optimizing the BMS

configuration. With the help of technically qualified operators they were already able to achieve notable

savings. The building managers were keen on advancing the optimization process by considering the

building dynamics while improving comfort levels. What made the challenge a bit easier was the fact

that the Shopping Centre was well maintained and the HVAC systems were in good shape.

Integration to R8tech allowed access and analysis of the building time series data. Before only the

real-time data and single selected trended values were available. After the integration was completed,

all the building data was trended and made easily accessible by R8tech online platform. R8tech

analysed the data and provided a diagnostics report. The main issues detected were:

In short, an imbalanced indoor climate caused waste of energy and discomfort. R8tech diagnostics

algorithms continued to run regular checks on the building. If a fault was found, the servicing team

received a notification.

Technical Description

Technical Management and a Challenge

R8 Technologies All Rights Reserved Copyright 2020

Cold 0-floor, even despite ventilation was used for heating 24/7.

Higher floors were constantly in cooling.

A few anomalies in the cooling systems control.

Several room controllers were not working as supposed during late hours, resulting in extra cooling cost.

At first, rule based predictive control was launched in the building. Autopilot took over control of Air

Handling Units (AHUs) and room controllers. The control parameters were adjusted based on the

indoor climate preferences of tenants. In the

following weeks, control of heating circuit of

ventilation was started, since then climate

changed gradually.

Heating impact of HVAC components was

calculated for each area individually to provide

only necessary heating during occupancy hours.

The advance heating optimization was

accomplished by interconnecting with the

building ecosystem (weather effect, heating

capacity and its impact, tenant interactions etc.).

Optimization of heating supply reduced the

additional cooling cost in upper floors.

Meanwhile, heating circuit models were trained

to improve the accuracy of adjustments.

Satisfaction of the building's tenants and visitors is one of the top priorities for the Magistral Shopping

Centre. From the enclosed table (below) it can be seen how the indoor climate has improved since R8

Autopilot started to control the building.

Autopilot actions

Summary

TOTAL Energy savings of 14,6%. Graph from November 2019 to February 2020 in comparison to the base year 2018

Comfort level without & with R8tech

TOTAL Energy savings of 14,6%. Graph from November 2019 to

November December January February‘18 ‘19 ‘18 ‘19 ‘18 ‘20 ‘18 ‘20

MWh

Without R8tech With R8tech

0

50

100

150

200

250

300

350

400

450

TOTAL Energy Consumption, MWh

R8 Technologies All Rights Reserved Copyright 2020

Comfort level without & with R8tech

0

20

40

60

80

100

%

General

Without R8tech (September ‘19)

With R8tech (Average October ‘19 - February ’20)

Shopping Restaurant General Shopping Restaurant

OK Too cold Too hot

10%

7%

83%

10%

7%

83%

5%1%

94%

20%

12%

68%

20%

12%

68%

19%

10%

71%

Main conclusion about comfort: indoor climate

of the building has improved since R8 Autopilot

started in October 2019.

Energy savings are the most easily

understandable data for financial calculations.

R8tech have provided 14,6% of heating and

electricity saving during 4 months (November

2019 - February 2020) of action while ensuring

optimal indoor climate according to the building

manager preferences and tenants feedback.

CO2 reduction in 4 months: 46 tons.

R8 Technologies All Rights Reserved Copyright 2020

Martin Kullamaa,

Maintenance Project Manager at EnerTEC Hooldus OÜ

“I am happy with the service R8tech has provided to us and would recommend it to anyone. R8 Digital

Operator has improved our indoor climate, lowered our energy costs and given us a great overview of

the whole building thanks to the clear-cut and interactive charts and tables. The email alerts are very

useful since they give us precise information about the location and nature of any possible faults or

anomalies in the systems. This enables us to diagnose and fix problems much faster than before.

R8tech’s customer service has always been very friendly and helpful with any questions we’ve had.”

TOTAL Heat Energy Savings of 39.9%. Graph from November 2019 to February 2020 in comparison to the base year 2018

0

20

40

60

80

100

120

140

160

180

November December January February‘18 ‘19 ‘18 ‘19 ‘18 ‘20 ‘18 ‘20

MWh

TOTAL Heating Consumption, MWh

CLIENT’S COMMENT

Without R8tech With R8tech