Page 27

© Photo Club

Air consumption is now metered

The consumption of power and water in the building portfolio has

‘hidden costs’. In many buildings, there is no separate designation of

a central role in numerous sustainability reports. This is likewise

these important cost components. Ventilation costs are determined

true of investment companies, real estate developers and other

in other buildings by taking the deduction of investment costs,

players in asset management. Heat energy consumption is also

maintenance costs and pro rata power, water and heating costs

closely examined. On the other hand, the issue of air consumption

into account.

in air-conditioning systems only very rarely shifts into focus.

However, this total cost is then allocated to the individual

The following figures show that the aims of ‘green building’

tenants according to the percentage of real estate surface they

and ‘building sustainability’ most assuredly warrant an additional

have rented. Such an allocation by area is felt by many to be unfair.

focus on ventilation and air-conditioning systems:

On the other hand, individual tenants do not have consumption

• About 25,000 of buildings in Germany have (at least) one air-conditioning or ventilation system. • About 400,000 of ventilation and air-conditioning systems altogether are installed. • The total area of these air-conditioned buildings is about 350 million m2. • The total ventilation and air-conditioning costs are about €6 billion.

transparency and thus have no incentive to save. The fairness question is asked in particular by those commercial tenants who require less ventilation than their neighbours or who have few cooling loads per area because of the type of use or location in the building. In the meantime, there is a remedy. Measuring technology manufacturer halstrup-walcher has introduced the P26, an ‘air meter’ that is installed right in the air entry duct of any leased

• The heating, cooling and flow of conditioned air generate an

area. Individual consumption is thus recorded in the same manner

annual CO2 emission in Germany of about 18 million tonnes.

as an electricity or water meter. The consumption values can be

Nowadays, these contributions to costs and the environment

read directly on the meter. Moreover, they can also be transferred

are only examined more closely in the rarest instances. Among

to a central metering point. The total ventilation costs can thus be

other things, this is due to the fact that ventilation and air-

distributed easily; adapted for each tenant’s share of consumption.

conditioning systems use other media to help them provide the

Along with the consumption-based invoice, recording air

desired temperatures and volume flows. This results in ventilation

consumption also results in an effective saving incentive. Displaying

consumption being lumped together with the costs for power,

consumption is said to lead to savings of 20-30%.

water and heating and ‘disappearing’:

In today’s competitive building market, innovations are more

• Air flow is produced by fans. They use electric power.

crucial than ever. Ideally, these should be the kinds of innovations

• Air conditioning requires refrigeration systems that consume

that simultaneously and sustainably lower costs and consumption

electric power and which are monitored separately. • Air is mainly heated via heating circuits, the costs of which

and increase the property’s attractiveness from the tenant’s point of view.

show up in the ‘heating budget’.

Bestech Australia Pty Ltd

It is thus no exaggeration to describe ventilation costs as

Apr/May 2015 - Sustainability Matters 27

Profile for Westwick-Farrow Media

Sustainability Matters Apr/May 2015  

Sustainability Matters is a bi-monthly magazine showcasing the latest products, technology and sustainable solutions for industry, governmen...

Sustainability Matters Apr/May 2015  

Sustainability Matters is a bi-monthly magazine showcasing the latest products, technology and sustainable solutions for industry, governmen...