EnerPHit Passive House incorporates Meazon metering system

Buildings energy consumption is a hot topic in recent years. Energy prices are going up and so the cost expenditure to run households and commercial premises. Without careful consideration and planning it becomes hard for the most to meet their energy obligations. Buildings energy consumption plays also a direct role in the building's environmental impact and its emissions of CO2 in the environment. In order to minimise those impacts the European Union introduced Directive 2010/31/EU on moving towards near-zero energy buildings (nZEB) by the end of 2020 defining nZEB simply as a building with very high energy performance.

The International Passive House Association is the global platform to asisst in research and development of construction concepts, building components, planning tools and quality assurance for especially energy efficient buildings. The term 'Passive House' refers to a rigorous, voluntary standard for energy efficiency in buildings, reducing its overall ecological footprint. It results in near-zero energy building that requires very little energy for space heating or cooling. Such projects typically save more than 70% of heating and cooling costs compared to a conventional building. The affiliated member of the International Passive House Association in Greece, the Hellenic Passive House Institute promotes best practices and establishes relevant projects. One of these projects is the Passivistas House Project.

Passivistas House Project, the Passive House approach to deep retrofit

This pilot project is the first registered Passive House by rennovation (EnerPHit) in the Mediterranean. It aims to become an exemplar project for the region favored with a splendid mild climate. The retrofit is on a typical 128m2 one family house of the 1960s to minimize (if not eliminate entirely) the need for conventional heating or air conditioning. The selected property is located in the Municipality of Papagou in Athens, Greece. It consists of ground floor dwelling area (98m2) and an independent semi-basement area space (30m2) which is used as an office. It is a full house with garden, structured in a proper spatial planning and the living space of the ground floor has a living room, kitchen, bathroom and two bedrooms. The way of design and step-by-step implementation, and the subsequent monitoring and metering pilot project Passivistas House Project will promote collaborative processes among executives of the Hellenic Passive House Institute, certified passive building designers, engineers and technicians from all sectors and commercial and technical department of companies manufacturing and marketing Passive House components. It offers to every citizen through open public data all the information required on how to drastically save energy in their house, while improving quality of life and contributing substantially to the fight against global warming.

For a building to be verified as a Passive House, it must meet the following criteria:

1. The space heating energy demand is not to exceeding 15 kWh per square meter of net living space (treated floor area) per year or 10W per square meter peak demand.

2. The primary energy demand, the total energy to be used for all domestic applications (heating, hot water and domestic electricity) must not exceed 120kWh per square meter of treated floor area per year.

3. In terms of airtightness, a maximum of 0.6 air changes per hour at 50 Pascals pressure (ACH50), as verified with an onsite pressure test (in both pressurized and depressurized states).

4. Thermal comfort must be met for all living areas during winter as well as in summer, with not more than 10% of the hours in a given year over 25 °C.

Passive House buildings are planned, optimised and verified with the Passive House Planning Package (PHPP).







The house will act as media and collaborative process hub aimed to prove in practice the ability to upgrade the energy consumption of residential buildings in Greece so they do not need conventional heating or air conditioning, while drastically reducing energy costs and improve the quality of life in them. And all this at an acceptable cost to the community. Specifically the implemented project will implement the following action areas:

The ground floor of the project will act as an open residence for seven consecutive years open for guided visits, lectures and presentations to the public, engineers, architects etc

The space of the basement will serve as headquarters of the Hellenic Passive House Institute as well as a venue of seminars, training, and materials showroom.

Meazon is proud to be part of this project and aims to sustain its support to relevant projects that showcase energy efficiency for the benefit of the building occupants, owners and the society.

Meazon offering

It is of paramount importance for the building operator to keep energy consumption to acceptable Passive House levels. Monitoring consumption as well as environmental credentials (temperature, humidity etc) is a key task for successful energy management. Through effective energy monitoring, it will be possible to target areas of high consumption and aim to rectify those first, saving energy while reducing CO2 emissions from emmiting to the environment. The occupants are able to obtain information by various routes such as the Meazon's web platform and smartphone application (Android, iOS) enabling informed decision making about their energy behaviour. The web platform supports further detailed analyses and generation of written reports.

Meazon offered a complete wireless metering system to demostrate the building's low energy consumption through real-time (down to quarter of an hour) and historical data representations. The system comprises of:

1 x Meazon Gateway

2 x Circuit-level meters (3 Phase DinRail 63A)

2 x Temperature & Humidity sensors

1 x Smart Plug (for plug loads)

The metering plan for the Passive House in Papagou is shown at the schematic below

passive house

Metering Plan_Passive House Papagou

Meazon Bizy solution is able to monitor and control electrical appliances and acquire data from the related sensors. Meazon smart energy meters and sensors send information wirelessly to the cloud service through Meazon's gateway. Users can control their devices remotely, create alarms, switch on/off or schedule an operational program and generate reports. Meazon energy meters can record the energy consumed -and produced (kWh), voltage (V), current (A), frequency (Hz), power (W) and reactive power (var).

Meazon's web analytics are easy to understand without the need of an expert's knowledge. Analytics are categorised and analyzed by load, day, week, month or year. The user easily sets alarm limits and compares between loads. The consistent design of the user interface provides clarity in all those elements necessary to manage and effectively control energy consumption.

new cloud

Meazon cloud web platform

Energy monitoring brings multiple operational, customer and also societal benefits.

Operational: automated meter readings, outage and anomaly detection and restoration, active and passive energy retrofits tracking, establish trendlines and performance targets.

Customer: cross-check billed and actual consumption figures, data access from anywhere-anytime, seize cost saving opportunities, occupancy comfort, add value to property.

Societal: social responsibility, helps in promoting and achieving resource efficiency and environmental objectives, public accountability, better energy and environmental practicing.

Meazon’s Bizy energy monitoring and control platform features wireless, easy to install and revolutionary small energy meters, with an open interface to the cloud and low Total Cost of Ownership. The platform is integrated to a Microsoft Azure cloud based energy analytics platform, providing meaningful energy management anywhere anytime.

Meazon is a proud supporter of the Hellenic Passive House Institute

passive house


National TV coverage of the Passivistas House project

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