In recent decades, home owners have a fairly large selection of heating systems. It is no longer necessary to connect to centralized networks and use traditional sources. You can choose equipment that uses alternative energy, but its main drawback is the high cost. Do you agree?
However, if you build a heat pump with your own hands from an old refrigerator, the system can be significantly cheaper. And we will tell you how to do it.
In the article, we selected the simplest solutions and provided them with detailed drawings and diagrams. Therefore, for a home craftsman to understand them is not difficult. In addition, here you will find step-by-step instructions for the manufacture of heating equipment. And the posted videos will talk about the design features of the heat pump and the features of its connection.
How beneficial is the use of a heat pump?
Theoretically, any person has a large selection of energy sources. In addition to natural gas, electricity, coal, it is also the wind, the sun, the temperature difference between the earth and air, land and water.
In practice, the choice is limited, because everything depends on the cost of equipment and its maintenance, as well as the stability of work and the payback period of the plants.
Each of the energy sources has both advantages and serious disadvantages that limit its use.
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Burning wood is the very first way to get heat. The advantage of this energy source is its accessibility and effectiveness. There are many more disadvantages: you have to spend a lot of energy on maintaining heat, toxic combustion products enter the environment, and deforestation has long been a serious environmental problem
Gas is cheap fuel. Heating buildings with gas boilers is the most profitable option. However, far from every area there is an opportunity to connect to the centralized gas supply line. Another minus: every year the cost of energy is growing
An alternative to connecting to a gas pipe is to install a gas tank. Household appliances (heating boiler, water heater, stove for cooking) operate on liquefied gas. This is a good solution for the house, if there is no other way to provide gas to the house. The disadvantage is the high cost of equipment, its installation and maintenance
Electricity is considered an ideal source of energy - relatively safe, clean, easy to use. However, heating the house with electricity is an expensive pleasure, so it is used for additional or alternative heating systems
The advantages of liquid fuel boilers are safety, high efficiency, long life, and autonomy. For their installation, permission and coordination of documents with the relevant authorities are not required. One drawback, but significant - the high cost of liquid fuel for the boiler
There are many types of heat pumps, and each of them has its own advantages and disadvantages. The pluses include environmental friendliness, profitability, safety, durability and uninterrupted operation of equipment, and minus - high cost. The only way to reduce the cost of heating is to make a heat pump yourself
The sun is a great source of electricity. It is environmentally friendly, inexhaustible, and solar panels require minimal maintenance. However, such equipment is not distinguished by either high efficiency or stability. In addition, it occupies a large area
The main advantages of wind energy are renewability, inexhaustibility, environmental friendliness. Wind generators are often installed in areas where it is not possible to connect to centralized networks for supplying electricity or gas. To stabilize the work, windmills are often used in combination with solar panels. Disadvantages - serious initial investment, noise during the rotation of the blades
Firewood as a source of thermal energy
Natural gas heating
Installation of gas tank on site
Electric heating boilers
Oil heating boilers
Solar panels as an energy source
Using wind generators for energy
Installation of a heating system with a heat pump is advantageous in terms of ease of use. During operation of the equipment there is no noise, odors, installation of chimneys or other auxiliary structures is not required.
The system is volatile, but the heat pump needs a minimum amount of electricity.
A heat pump is a good alternative to conventional heating systems. To reduce the initial cost of equipment, you can assemble it yourself
Thermal plants themselves are extremely economical and do not require special maintenance costs, but their initial cost is very high.
Not every owner of a house or a summer residence can afford the purchase of such expensive equipment. If you assemble it yourself and use parts from an old refrigerator, you can save a lot.
Heat pumps industrial production of the road. It is believed that their installation pays off on average for 5-7 years of operation, however, this period depends on the initial price of the structure and can be much larger
Home-made installations cost literally a penny, and their use can significantly save.
The only caveat: the performance of homemade products is low, and they can not be a full replacement for traditional heating systems. Therefore, they are often used as additional or alternative heating options.
5 key benefits for installation owners
The advantages of heating systems with heat pumps include the following:
- Cost effectiveness. At a cost of 1 kW of electric energy, you can get 3-4 kW of heat. These are average indicators, as heat conversion coefficient depends on the type of equipment and design features.
- Environmental Safety. During the operation of the thermal installation, no combustion products or other potentially hazardous substances enter the environment. The equipment is ozone safe. Its use allows you to get heat without any harm to the environment.
- Universality of application. When installing heating systems powered by traditional energy sources, the owner of the house becomes dependent on monopolists. Solar panels and wind generators are not always cost-effective. But heat pumps can be installed anywhere. The main thing is to choose the right type of system.
- Multifunctionality. In the cold season, the plants heat the house, and in the summer heat they are able to work in air conditioning mode. The equipment is used in hot water supply systems, connected to the contours of underfloor heating.
- Safety operation. Heat pumps do not need fuel, toxic substances are not emitted during their operation, and the maximum temperature of equipment components does not exceed 90 degrees. These heating systems are no more dangerous than refrigerators.
Ideal appliances do not exist. Heat pumps are reliable, durable and safe, but their cost depends on power.
High-quality equipment for proper heating and hot water supply of a house of 80 sq.m. will cost about 8000-10000 euros. Homemade products are low-power, they can be used for heating individual rooms or utility rooms.
The effectiveness of the installation depends on the heat loss of the house. It makes sense to install the equipment only in those buildings where a high level of insulation is provided, and the heat loss indicators are not higher than 100 W / m2.
Heat pumps can last 30 years or more. Especially cost-effective their use for domestic hot water, as well as in combined heating systems, including underfloor heating.
Equipment reliably and rarely breaks down. If it is homemade, it is important to choose a high-quality compressor, best of all - from a refrigerator or air conditioner of a proven brand.
Types of heat pumps for home heating
Distinguish between compression and absorption heat pumps. Installations of the first type are the most common, and it is such a heat pump that can be assembled from a refrigerator or an old air conditioner using a ready-made compressor.
Also required are an expander, an evaporator, a condenser. Absorption systems require an absorbent freon.
Heat pumps are most often collected from units of air conditioners and refrigerators. Such handicraft constructions are simple, effective, and if the master has the skills of such work, they can be done in just a few days
By type of heat source, the plants are air, geothermal, and also using secondary heat (for example, wastewater, etc.).
In the input and output circuits, one or two different coolants are used, and depending on this, the following types of equipment are distinguished:
- air-to-air;
- water-water;
- water-air;
- air-water;
- ground water;
- ice-water.
A system can be effective only if it consumes less energy than it gives. This difference is called the conversion factor. It depends on many factors, but the most significant is the temperature of the coolant of the input and output circuits. The bigger the difference, the better the system works.
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Air-to-water heat pump
Block diagram for several heat pumps
Geothermal heat pump for home
Heat pump "ice-water"
There are no reliable formulas for calculating the performance of heat pumps, because their work depends on many factors.
With the self-assembly of a thermal installation, one cannot expect that it will be as effective as industrial equipment, but it will be enough to create an economical additional heating system.
Step-by-step equipment manufacturing instructions
Before you figure out how to make a heat pump out of the refrigerator, you need to decide on the heat source and the operation scheme of the device. In addition to the refrigerator compressor, other components will be required. You will also have to buy or rent some tools.
This homemade product can be connected to a warm floor, a hot water supply system or to water heating if low-temperature radiators are used
Even if you have to buy a compressor and other components, a home-made installation will cost much less than ready-made industrial equipment.
Stage # 1. Preparation of the scheme and drawing
The proposed scheme is suitable for any heat source. To assemble home-made, you should adapt the circuit itself to the operating conditions of future equipment and develop a drawing
Regardless of the heat source, the designs of the heat pumps are similar, so almost any circuit that can be found on the network is suitable.
After choosing it, you should prepare detailed drawings, which will indicate the exact dimensions, distances and connection points of the installation nodes.
To make a heat pump, you have to disassemble the refrigerator and remove the compressor. This is the main element of the design. He will pump water and freon through the laid pipeline, providing heating
Although the calculation of the installation capacity is difficult, you can focus on the average. So, for a house with increased heat efficiency indicators, a heating system with a power of 25 W / sq.m is needed. This is ideal if heat loss is minimal.
For a well-insulated house, this figure is 45 W / sq. M., And for a building with relatively large heat losses - 70 W / sq. M.
Stage # 2. Selection of necessary parts
The compressor can be removed from the old refrigerator. If it is faulty, it is better to buy a new one. It is not worth repairing: it is unprofitable, and the performance of the homemade product will be in question.
A temperature control valve will also be required to assemble the structure. It is desirable that all components are from one system and are easily combined.
This is the main part of the refrigerator. The task of the unit is to pump the refrigerant through the tubes, which takes away the heat of the working part. For a homemade heat pump, it is better to take a low-noise compressor
To install the heat pump, you need 30-cm L-shaped brackets.
You will also have to buy some details:
- high-quality sealed container made of stainless steel with a volume of 120 l;
- large plastic tank with a capacity of 90 l;
- 3 copper pipes of various diameters;
- polymer (best metal-plastic) pipes.
To assemble the system you will need a standard set of tools, and for cutting and joining metal parts - a grinder and a welding machine.
Stage # 3. Installation of system components
The compressor is mounted on the wall using brackets, and then proceed to the manufacture of a capacitor. For this, the metal tank is cut in half with a grinder. A copper coil is installed in one part, after which the container is welded and threaded holes are prepared in it.
The heat exchanger for the heat pump practically does not differ from the same assembly that is made for the bath furnace. 2.5mm thick stainless steel tank is best suited
To produce a heat exchanger, a long copper pipe is wound around a 120-liter steel tank, securing the ends of the coils with rails. The plumbing junctions are connected to the findings.
A coil is also mounted on a plastic tank and used as an evaporator. It does not overheat, so it is not necessary to take a metal container. The finished evaporator is attached to the wall using brackets.
When choosing a compressor and an evaporator, a power calculation with a margin of 20% should be done, otherwise the power of the finished heating system will be lower than the desired
When the main components are prepared, a suitable thermostatic valve is selected, the structure is assembled and R-22 or R-422 brand freon is pumped into the system. If there are no relevant skills, it makes sense to invite a specialist, as the procedure is unsafe.
Stage # 4. Connection to a fence
The type of intake device and the features of connecting a heat pump to it depend on the scheme:
- "Water-land". The collector is installed below the level of freezing of the soil. System pipes should be at the same depth.
- Water-to-Air. Mounting this type of system is relatively easy, as earthwork is not required. A convenient place near the house or on the roof is suitable for installing the collector.
- "Water-water". The design of the collector is collected from polymer pipes, and then lowered into the center of the reservoir.
Installation of a combined (bivalent) heating system is possible. In this case, the heat pump is connected in parallel with the electric boiler. It performs the function of additional heating.
Installation of a bivalent heating system allows you to achieve the optimum temperature in the house even in severe frosts, and its energy consumption will be minimal.
During the assembly, installation and connection of the heat pump, you need to carefully monitor the quality of welds, joints and joints. The system must be absolutely leakproof.
We have heat pumps are not yet particularly common, but you can already find craftsmen who can share the experience of self-manufacturing such systems. We offer a selection of useful videos.
Heat pump design, system assembly features:
Features of connecting, operating a homemade heat pump:
Video feedback on the operation of a home-made heating system from an air conditioner:
Heating schemes with heat pumps are not always cost-effective and convenient, so be sure to weigh the pros and cons of this type of heating.
If you come to the conclusion that such a system is suitable for your home, do not rush to spend huge amounts on the finished installation and assemble the structure yourself. It is not so difficult, it requires much less money, and the effect can exceed all expectations.
Are you going to assemble a heat pump yourself, but do not know where to start? Or maybe it has already happened to collect a similar design and there is the necessary knowledge that you can share with our readers? Please leave comments, ask questions in the block below.