AGROTOURISM FARMS, GUEST HOUSES, INNS

Two heat exchangers 700/150/1W were installed in combination with eight solar collectors (first source of heat) for a domestic hot water system and a central heating system; additionally two 48 KW gas-fired stoves were installed as a supporting system.

What have we achieved?
First, solar collectors accumulate the temperature of 60ºC in a heat exchanger and, assuming a high temperature consumption by the domestic hot water system and the central heating system, gas-fired stoves only reheat the system (i.e. supply additional heat to achieve the requested temperature level).
Heat exchangers accumulate the temperature generated by solar collectors; they operate as a heat coupling which connects two different sources of heat:
- solar collectors,
- gas-fired stoves,
and then distributes the accumulated heat to three central heating systems and one domestic hot water system with circulation

A house 200m² + a workshop

A solid-fuel (wood) boiler and solar collectors were installed in combination with a heat exchanger 700/2W. The heat exchanger is used as an accumulation tank which accumulates the heat generated by both sources of heat and then distributes the heat to one central heating system (radiators) located in the detached house and two central heating systems located in the workshop (radiators in the office and a water heater in the workshop). The heat exchanger also connects the sanitary hot water systems in both locations (the detached house and the workshop).

Disadvantages

• An electric stove and an electric boiler have been installed
• Maintenance-free equipment which, in practice, proved to be a very expensive energy source
• To reduce the costs of heating of the premises an ordinary fireplace has been installed
• It turned out that the fireplace required maintenance both at day and at night; additionally the space around it required frequent cleaning
• As the result, the heating and the sanitary hot water system both at the house and in the workshop had to be used sparingly

Advantages

• Implementation of the above solution resulted in decreased costs of supplying hot water and heating the house and the workshop.
  The current consumption of wood to heat both the house and the workshop corresponds to the costs previously incurred to heat the house itself by a fireplace only
• The need for frequent maintenance of the boiler has been reduced and the fireplace now works safely

A single-family house

A Cichewicz-company coal-fired boiler has been combined with a heat exchanger 700/1W. The heat accumulated in the heat exchanger is supplied to two central heating systems, i.e. floor heating on the ground floor and radiators on the first floor.
Our heat exchanger fully satisfied all the customer’s requirements with regard to ensuring proper quantity of hot water for the family and for heating the whole house; in this configuration our heat exchanger works both as a buffer tank, a heat coupling and a heat exchanger.

A terraced house

A wood-fired boiler has been combined with a heat exchanger equipped with a sanitary hot water system coil pipe. The installation has been made according to the wood-fired boiler manufacturer’s recommendations. The boiler reaches its nominal power and efficiency at 80/90ºC and does not require frequent maintenance. A temperature valve at the pump and a flap valve at the inlet, both mounted in a boiler – heat exchanger system configuration, allow for safe boiler operation, even in the case of power disruptions. Flow of water by gravity between the boiler and the heat exchanger delays the process of water boiling in the boiler.

The photos above show a boiler room with an open-vented system where a wood-fired boiler 32 KW and a heat exchanger 140 + an electric stove have been installed.

At the connection between the boiler and the heat exchanger a flap valve and a pump controlled by a boiler as well as a 60°C temperature valve at the return to the boiler have been installed.
A TS130 valve installed on the boiler is used to reheat the boiler.
A three-way temperature valve and an euroster-controlled pump have been installed in the central heating system.
The floor heating has been additionally equipped with a three-way valve 35-60ºC and a separate pump.
Also a domestic hot water system circulation pump has been installed.

Advantages

• The heat exchanger is a buffer for the solid-fuel boiler. This allows for maintaining a constant temperature of 80ºC
• The heat exchanger supplies heat to two separate central heating systems
• Three thermostat-controlled electric heaters have been installed in the heat exchanger
  (when the fire in the boiler is damped the electric heater switches on automatically. This allows for a continued heating of the central heating system and the domestic hot water system)

The photo above shows a heat exchanger 300/1W combined with a coal-fired boiler 12 KW supplying heat to one central heating system.
Small size of the equipment allows for installing it even in small rooms. Such heat exchangers operate successfully without taking too much space.

The photo above shows: 
a wood-fired boiler 40 KW,
an electric stove 66 KW with a domestic hot water reservoir connected with a plate exchanger.

After the boiler room modernization:    
a wood-fired boiler 40 KW and an electric stove 66 KW, both connected to the heat exchanger 700/1W supplying heat to two separate central heating system.

Disadvantages

• It is difficult to achieve 80ºC at the solid-fuel boiler
• No option to control the transfer of the temperature to the central heating system
• In the absence of the current rapid overheating of the boiler
• Frequent boiler maintenance – adding fuel and cleaning of the boiler and the chimney
• Large quantities of ash
• Limited quantity of the domestic hot water

Advantages

• Continuous boiler operation at 80ºC
• when the heat exchanger becomes hot it is possible to transfer the heat to the central heating systems
• In the absence of current the boiler does not overheat
• Boiler maintenance: every 10-12 hours
• Much smaller quantities of ash
• Unlimited amount of domestic hot water
• Exchanger has been additionally equipped with an electric heater to be used in the summer

The photo above shows a 24KW gas-fired boiler used to supply heat to the central heating system and a 200-litre boiler for sanitary hot water.

The new central heating and domestic hot water systems are composed of:
ATMOS 75 KW wood-fired stove, connected with a heat exchanger 700/200/1W
(700 l tank with a 200 l tank inside made of stainless steel intended for sanitary hot water + solar collector coil pipe and an accumulation tank for the central heating system)

Disadvantages

• Gas boiler power is too small to heat the whole building
• VERY LARGE COSTS of heating; heat is supplied to several rooms only (bedrooms and bathrooms)
• Additional cost of heating the domestic hot water for 12 persons.

Advantages

• The boiler power properly matches the building cubage
• All rooms are heated up to the preset temperature
• Low cost of heating the building (approx. PLN 200 a month, including heating of domestic hot water)
• Boiler maintenance: every 10-12 hours
• Unlimited quantity of domestic hot water
• Additionally, for the summer period a 6-plate solar batteries set has been envisaged to ensure heat for the domestic hot water system and as a support to the central heating system.