Controlled domestic ventilation

Controlled domestic ventilation

Controlled domestic ventilation can be used in both low-energy and older houses. In low-energy houses the controlled ventilation system guarantees the required air exchange rate, even with the doors and windows closed. When older houses are renovated better thermal insulation could be used, along with fitting new windows to enable controlled domestic ventilation to achieve the necessary air exchange rate. These types of older building are often affected by street noise. A ventilation system would therefore be beneficial in these cases too. Controlled domestic ventilation with heat recovery When ventilation based on opening windows and controlled domestic ventilation without heat recovery are used, the energy from the inside air is not used. However the ventilation heat requirement accounts for a considerable part (40 – 50%) of the total heat requirement. In contrast to this, controlled domestic ventilation with heat recovery reuses the energy from the exhaust air. Not only that, the additional heat generated internally from lighting, people and domestic appliances is also utilised through heat recovery. Our FIGHTER exhaust air heat pumps facilitate heat recovery and supply the energy recovered from exhaust air for the domestic hot water and even the heating. Not only does energy recovery ensure a healthy and comfortable form of heating, it also produces considerable savings in terms of heat energy, along with CO2 emissions.

Can it be docked to solar heating?

How often do I need to change filter? And where can I get a new one?

Information about air filters can be found in your “Installation and Maintenance Instructions” for the product. New filters can be ordered from NIBE if the filter needs changing.

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Can it be docked to solar heating?

Here you can find a dockningsschema which describes the above case.

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In which room should the ventilation air be taken?

It is slightly up to the individual, but it is recommended to take the air from bathroom, kitchen (not kitchen fan), hall, utility room etc. The supply air to the house is often through grilles under the windows or in the walls and these are placed in other rooms where one does not extract any air. Through this one obtains a natural flow and exchange of air throughout the house.

Frequently asked questions

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What is a heat pump and how does it work?

A heat pump is an electrical device that extracts heat from one place and transfers it to another. The heat pump is not a new technology; it has been used in Sweden and around the world for decades. Refrigerators and air conditioners are both common examples of heat pumps.

Heat pumps transfer heat by circulating a substance called a refrigerant through a cycle of alternating evaporation and condensation (see Figure 1). A compressor pumps the refrigerant between two heat exchangers. In one heat exchanger, the evaporator, the refrigerant is evaporated at low pressure and absorbs heat from its surroundings. The refrigerant is then compressed en route to the heat exchanger, the condenser, where it condenses at high pressure. At this point, it releases the heat it absorbed earlier in the cycle.

Controlled domestic ventilation

Controlled domestic ventilation

Introduction

Nowadays we spend around 90% of the time indoors. This undoubtedly places great demands on the climate inside. The inside climate is affected considerably by odours, harmful substances, noise and temperature. In every building there is a certain amount of basic ventilation, even if it is only produced by air coming through windows, doors, pipe ducts and walls. This type of ventilation, in older houses in particular, provides the necessary exchange of air. Ventilation is also provided through opening windows and doors, perhaps also when one or more windows are opened at an angle. Strong wind pressure and a difference in temperature between the interior and the exterior also increase the exchange of air. On the other hand, a weak wind or small temperature difference will reduce the required air exchange rate. This uncontrolled ventilation also accounts for a significant part of the heating costs and causes a considerable proportion of non-renewable energy resources to be wasted. Low-energy house In contrast to this, there is the low-energy house concept. A construction design is used in this type of house that prevents heat from escaping through use of effective thermal insulation. This also means that low-energy houses benefit the environment. But even with this construction design, there is still the problem that the required hourly air exchange rate of 0.5 – 1.0 is not achieved. To achieve the required air exchange rate either the windows would have to be opened, which would run counter to the whole low-energy house concept, or installation of a controlled domestic ventilation system with heat recovery would have to be considered.

pollutants

These pollutants vary considerably according to the inside climate conditions, the state of ventilation and the design and use of the inside area. When energy-saving measures were introduced in the early 1970s, considerable efforts were made to improve the insulation used in the construction industry. This led to a reduction in the air exchange rate inside buildings. From a health and allergy perspective, the ideal air exchange rate would be 0.5 – 1.0, but in actual fact, air ex change rates in appropriately insulated houses are only between 0.3 and 0.5, which means that the polluted inside air is exchanged far too in-frequently. Based on the reasons given above, an increase in the incidence of complaints affecting the population is inevitable. This is where controlled domestic ventilation can have a particular role to play. Its purpose is to control temperature and dampness, while ensuring that the quality of the inside air is totally hygienic. The relevant technical guidelines and hygiene regulations are stipulated by DIN 1946.

Save energy, water and money

Save energy, water and money An energy-efficient, A-labelled heating circulator uses up to 80% less energy than a conventional D-labelled model, cutting around 10% off an average household's annual electricity bill. To benefit from year-round savings on energy bills and CO2 emissions you should replace your old circulator with an ALPHA2 now. Also new building projects deserve ALPHA2.

Likewise, the Grundfos hot water recirculation pumps help you save water and energy. Many people wait for hot water for more than 60 seconds. With instant hot water, litres of cold water is saved from running down the drain during the wait.

Overview

Overview

Unmatched home comfort
Most people associate a comfortable home with a warm and cosy indoor environment. That is why a domestic heating circulator pump is an integral part of any household with central or district heating. It represents the heart of the system and is responsible for moving hot water from the heating boiler to heating devices such as radiators, and for securing optimum heating regulation.

Most people also appreciate the pleasure of instant hot water. A hot water recirculation solution ensures that you never have to wait for hot water in showers and taps.