Energy efficiency solutions

Human life is unimaginable without the energy. It’s common for us to the use organic fuels as energy sources: coal, gas, oil, shale oil etc. But, as you know, their natural resources are limited. As a result, their usage prices are increasing day by day. Moreover, sooner or later the day when they will run out will come. Answer to a question “what to do in the threshold of energy crisis?” has been long found: we need to search for other energy sources - alternative, unconventional, renewable. However the question arises: Where will we get these sources?! But the energy is always around us. It is in the earth, water and sun. So why not use it for conversion of heat energy for your home? Modern solutions and technologies allow to do it easily and quickly. The only thing that scares some people is investment in new systems. But we should not forget that we are investing in tomorrow, and not only to make profits in the future, but also to do good to our planet.

Alternative sources of energy

Collector is usually placed in rings or meanderingly in horizontal trenches below the soil freezing depth (usually from 1.20 m and more). This method is the most cost-effective for residential objects, provided there is no land area deficit for the circuit.


Energy always surrounds us. It is in the earth, water and sun. So why not use it for your home? Modern solutions and technologies allow to do it easily and quickly.


Types of heat pumps:

For private houses, two of the most frequently used types of heat pumps are: geothermal and air.

Geothermal (they use heat stored in the earth and ground or underground subsoil waters). Closed loop:

Horizontal. Collector is usually placed in rings or meanderingly in horizontal trenches below the soil freezing depth (usually from 1.20 m and more). This method is the most cost-effective for residential objects, provided there is no land area deficit for the circuit.
Vertical. Collector is placed vertically in boreholes with a depth of up to 200 m. This method is used in cases when the land area doesn’t allow to place circuit horizontally or landscape may be damaged.
Water. Collector is placed meanderingly or in rings in the water (lake, pond, river) below the freezing depth. It’s the cheapest method but there are requirements for minimum depth and volume of water in reservoir of the given region.


Outdoor unit. Source of heat transfer is external air. Today, these devices can operate at temperature of up to «-25С». But remember, the higher the temperature, the better the performance.

Indoor unit. Source of heat transfer is warm utilized air received through mechanical ventilation. Today, there are units that combine both heat pump and exhaust ventilation system.

Advantages of heat pumps.

Economy: In order to transfer 1 kWh of heat energy to the heating system, device needs to consume just 0,2-0,35 kWh of electric energy. All systems operate using closed loops and require almost no maintenance costs, only cost of electric energy needed for equipment operation.

Operation mode: option to switch from heating mode in winter to conditioning mode in summer: fan-coils or “cold ceiling” systems are connected to outdoor collector instead of radiators.

Automated system: System doesn’t require any special maintenance in operation process, possible actions do not require any special skills and are described in the manual.

Personalized selection: Each customer can choose a system that fits his requirements, based on the selection of a stable source of low-potential energy, calculation of coefficient difference, payback and others.

Compactness:Devices are very compact and do not require much space.

Calculations of building heating expenses (Heated area 200 m2)

Name Natural gas Electric energy Diesel fuel Heat pump
Energy carrier price 0.75 euro/м3 0.12 euro/kW*hour 1 euro/l 0.12 euro/kW*hour
Thermal value 8,9 kW/м3 0,95 kW*hour 9,4 kW/l 0,27 kW*hour 
Price 1kW*hour 0.08 euro 0.13 euro 0.11 euro 0.037 euro
Energy carrier nominal consumption per 1 hour 2.16 м3/hour 20.21 kW 2.04 l/hour 5,77 kW
Heating cost per 1 hour 1.62 euro/hour 2.43 euro/hour 2.04 euro/hour 0,69 euro/hour
Energy carrier annual expenses 4961.80 м3 46484.21 kW*hour 4697.87 l 13281.20 kW*hour

Heating cost per year

 3721.35 euro

5578.11 euro

4697.87 euro

1593.75 euro

Ventilation system

Today, the main task of ventilation systems is to create a comfortable and healthy microclimate in your house. These systems also help to control the temperature of the rooms, which results in reduced heat loss in your home.

We offer installation of mechanical exhaust system, which interacts directly with the heat pump. This helps to make heat recovery efficiently with no damage to ventilation.

Air circulation inside the building plays important role in room environment. For example, take an ordinary panel building. What will happen if this building has packet windows and heated front but doesn’t have a properly functioning ventilation system?! In such apartment there is no sufficient air circulation. Excessive amount of carbon dioxide and moisture starts to prevail in the air, which may insensibly but seriously affect residents health (allergies, breathing problems, sleep disorders and decrease of working ability).

Heat loss

The average one-year cost of fuel and the heat balance of the building housing 3000м2 (21°) Unrenovated house Renovated house (insulated enclosures, new windows, new heating system) Renovated house ventilation system with heat recovery (heat pump)
  MWh/a €/a MWh/a €/a MWh/a €/a
Through the boundless loss -450 -32251.5 -153 -10965.51 -153 -10965.51
The ventilation losses -150 -10750.5 -150 -10750.5 -150 -10750.5
Waste water loss -150 -10750.5 -150 -10750.5 -150 -10750.5
          +150 +5385
TOTAL REQUIRED HEAT -750 -53752.5 -453 -32466.51 -303 -27081.51
Central heating price: 71,67 €     Heat ventilation heat Price : 35,9 €/MWh
Natural ventilation efficiency depends on temperature differences (specific gravities) of the rooms and external air, as well as height of the ventilation duct. The lower is the temperature of external air and the *higher* is the ventilation duct (if its cross-section is sufficient), the better is exhaust in the ventilation junction. In addition to exhaust duct efficiency, air exchange amount depends on conditions of fresh air inflow into the apartment. To improve air exchange (ventilation), ventilation devices are installed in the attic or on the roof of the residential building and then connected with ventilation heat recovery devices from utilized and foul air. Before installation of these systems, noise isolation works are carried out. Devices operate in automatic mode and are adjusted by configured automated mechanisms on the master remote control but it’s also possible to perform all the actions manually in case of automated mechanisms malfunction. During the heating season, ventilators help to provide constant exhaust from apartments, regardless of external air’s temperature and apartment’s position in the building. In summer season, when air inflow in apartments is not limited, it is better to install additional ventilator or increase capacity if device’s capacity allows. For accumulation of warm utilized air, new airway is mounted into ventilation heat recovery device in the attic (roof). Airway is isolated with mineral wool to reduce cooling and to maintain air temperature. New central airway is connected with the old tunnels... preferably toilet/bathroom, however it is possible to use kitchen tunnels which in their turn should be adjusted. Also, other ventilation equipment is installed, in compliance with fire regulations of the given region and customer’s wishes (needs). Of course, you shouldn’t forget to check and clean old airways before installation of these systems (as practice shows, many of them turn out to be very dirty, if not completely embedded with sand and other materials).
When improving residential building’s ventilation, in addition construction of mechanical exhaust from toilet/bathroom, it’s also important to ensure fresh air inflow in the apartment. For these purposes, *fresh air pipes FRESH* are mounted into building’s external walls (it should be done with additional wall insulation) or adjustable grilles FRESH are mounted into window frames (if window frame structure allows).

Sun is our planet’s main source of energy and life. But people could not control this energy before the appearance of modern technological solutions. Today, people learned how to get both electric energy and heat energy from the sun. Sadly, it’s not enough for complete self sufficiency of mankind, although it helps to significantly reduce consumption of liquid and solid fuels (their resources are running out every year with no self-recovery, and as a result their prices will only keep increasing). Moreover, use of solar energy will not affect the environment.

Solar collector

Solar collector is a device for collection of solar heat energy (solar station) which carried by visible light and near-infrared radiation. Unlike solar cells that produce electricity directly, solar collector heats the heat transfer material. Heat-transfer is used for domestic water heating in accumulation tanks and water heating for heat system.


Types of solar collectors

Two of the most frequently used types of solar collectors are: flat and vacuum. Each option has its pros and cons. Their selection should be based on your building’s location, solar activity in the region, your needs and other factors.

A set of collectors is selected in compliance with your requirements, which includes: quantity and type of panels, accumulation tank, set of pumps, fresh water module, heat system module.

Also, solar collectors system works perfectly with other producers of heat energy, helping to reduce their workload and thus make the system more economic.

Example of efficiency

Project description

Number of residents   4
Building type  Old building (over 10 years), the energy consumption is about 75 kW / m² per hour
Angle 45°
Orientation (E = +90°, S = 0°, W = -90°) 
Heated area  170 m²

System location

Longitude: 24.577°
Latitude: 59.446°
Height: 9 m

System description

The collectors 4 x SKR500
General area 10
Tank PSC800 + PS800
Selected solar system produces about 4808 kWh of heat per year, saving about 27% on your annual heating costs.


Overview of solar thermal energy (the values)

The collector area 10.3 m²
Total solar energy share 27.5%
Share of solar energy when heating the hot water 42.5 %
Share of solar energy when heating the building 20.3 %
Maximum reduction of CO ₂ emission 2,579.3 kg

Share of solar energy in the system (%)


Konvil OÜ, Hundipea 5, 10416 Tallinn

Phone: +372 660 3637, Fax: +372 660 2106, Gsm: +372 5656 9517

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About us:

The main goal of Konvil OÜ company is to prepare and perform for a customer an optimal and comprehensive energy efficiency solution for buildings of any type: apartment cooperatives, administrative buildings, industrial facilities, private houses. Since 1996, our workers have performed works on more than 150 objects in Estonia, Latvia, Finland and Russia.

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