Fans of tinkering will always find use of their own strength, patience and waste materials. Of the almost free components, they easily build a very useful thing in everyday life.
For example, they can make an effective Frenett heat pump with their own hands, without spending anything. But they will replenish their knowledge and skills, and this is priceless, right?
The information provided will help to understand the principle of the unit. With our help, you can decide on the design and find out how the model is made. Clear instructions for the production of this type of heat pump will provide effective assistance to independent home craftsmen.
We provide practical recommendations for the production of productive home-made and tips on the operation of such equipment.
The content of the article:
- Principle of operation of the device
- Instructions for using the device
- Frenett Pump Design Options
- Independent manufacture of the device
- Conclusions and useful video on the topic
Principle of operation of the device
Those who came into contact with issues of cost-effective heating, the name “heat pump” is well known. Especially when combined with terms like “earth-water”, “Water-water”, or “Air-water” etc.
Such a heat pump with a Frenett device has almost nothing in common. In addition to the name and the final result in the form of thermal energy, which is eventually used for heating.
Heat pumps operating on the Carnot principle are very popular both as an economically efficient way of organizing heating and as an environmentally safe system.
The operation of such a complex of devices is associated with the accumulation of low-potential energy contained in natural resources (land, water, air), and converting it into thermal energy with high potential.
The invention of Eugene Frenetta is arranged and works completely differently.
A photo of
Heat generating system developed by E. Frenett, can not be unconditionally attributed to the class of heat pumps. By design and technological features this heater
The unit does not use geo-or helio-energy sources in its work. The heat transfer oil inside it is heated by the frictional force created by rotating metal discs.
The working body of the pump is an oil-filled cylinder, inside which the axis of rotation is located. This is a steel rod equipped with parallel disks mounted after about 6 cm.
Centrifugal force pushes the heated coolant into the coil attached to the device. Heated oil exits the instrument at the top of the joint. Coolant returns to bottom
The appearance of the heat pump Frenetta
Warming up device during operation
The main structural components
The actual size of one of the models
The principle of operation of this device is based on the use of thermal energy, which is released during friction. The design is based on metal surfaces located not close to each other, but at a certain distance. The space between them is filled with liquid.
Parts of the device rotate relative to each other by means of an electric motor, the liquid inside the case and in contact with the rotating elements is heated.
The resulting heat can be used to heat the coolant. Some sources recommend using this liquid directly for the heating system. Most often, an ordinary radiator is attached to the Frenette self-made pump.
As heating system heating medium Experts strongly recommend using oil, not water.
During pump operation, this fluid tends to heat up very much. Water in such conditions can simply boil. Hot steam in an enclosed space creates excessive pressure, and this usually leads to rupture of the pipe or the body. Using oil in such a situation is much safer, since its boiling point is much higher.
For the manufacture of the Frenett heat pump, you need an engine, a radiator, several pipes, steel butterfly valve, steel discs, metal or plastic rod, metal cylinder and nut set (+)
There is an opinion that the efficiency of such a heat generator exceeds 100% and may even be 1000%. From the point of view of physics and mathematics, this is not an entirely correct statement.
Efficiency reflects the loss of energy spent not on heating, but on the actual operation of the device. Rather, the phenomenal claims of the incredibly high efficiency of the Frenett pump reflect its efficiency, which is truly impressive. The cost of electricity for the operation of the device is negligible, but the amount of the resulting heat is very noticeable.
Heating the coolant to the same temperature using heating elements for heating, for example, would require a much larger amount of electricity, perhaps ten times more. A household heater with such a consumption of electricity would not even heat up.
Why aren't all residential and industrial premises equipped with such devices? The reasons may be different.
First of all, water is a simpler and more convenient coolant than oil. It does not heat up to such high temperatures, and to eliminate the effects of water leaks is easier than removing spilled oil.
Secondly, by the time of the invention of the Frenetta pump, the centralized heating system already existed and successfully operated. Dismantling it for replacement with heat generators would be too expensive and would cause a lot of inconvenience, so nobody even considered this option seriously. As the saying goes, the best is the enemy of the good.
Instructions for using the device
It is worth noting that variations of the pump by Evgeny Frenett using water as a coolant still exist. But usually these are large industrial models that are used in specialized enterprises.
The operation of such devices is strictly controlled with the help of special devices. Provide a similar level of security at home is almost impossible.
The general scheme of an industrial heat generator developed by Khabarovsk scientists: 1 - capacity; 2 - inlet; 3 - outlet; 4 - water heater; 5 - bearing shaft. Water is used as a coolant.
The most popular version of the Frenett pump, which uses water rather than oil as a heat carrier, is a device developed by scientists from Khabarovsk: Nazyrova Natalia Ivanovna, Leonov Mikhail Pavlovich and Syar Alexander Vasilievich. In this mushroom design, water is specially boiled and turned into steam.
Then the reactive force of steam is used to increase the speed of movement of the heat-transfer fluid through the pump channels to 135 m / min. As a result, the energy costs for moving the coolant are minimal, and the return in the form of thermal energy is very high.
However, such a unit must be extremely durable, and its work should be constantly monitored to avoid accidents.
What to do if it is supposed to organize heating of a large room or a whole house with the help of a Frenett pump? Water is a traditional heat carrier, most heating systems are designed specifically for it. Yes, and filling the whole heating system with a suitable liquid oil can be a costly business.
This issue is solved very simply. It is necessary to additionally build a conventional heat exchanger, in which the heated oil will heat the water circulating through the heating system. At the same time, some heat will be lost, but the overall effect will remain quite noticeable.
The Frenett heat pump can be successfully used in combination with underfloor heating systems. But instead of water in the pipes need to pour liquid oil
An interesting idea would be to use a Frenett pump in conjunction with floor heating system. The coolant is then allowed through narrow plastic pipes laid in a concrete screed.
Such a heating system functions in the same way as a conventional water-heated floor. Of course, a project of this type can be implemented only in a private house, since it is allowed to use exclusively for high-rise apartment buildings. electric floor heating.
A practical and convenient way to use such a device is to heat a small room: a garage, a shed, workshop, etc. Frenetta pump allows you to quickly and effectively solve the problem of autonomous heating in such places.
The cost of electricity for his work is small compared with the resulting thermal effect, and to build such a unit is not difficult from the most simple materials.
Frenett Pump Design Options
Eugene Frenett not only invented the device, named after him, but also repeatedly improved it, coming up with new, more efficient versions of the device.
In the very first pump, which the inventor patented in 1977, only two cylinders were used:
- outer - a hollow cylinder larger than the diameter and is in a static state
- interior - The diameter of the tank is slightly smaller than the dimensions of the cavity of the outer cylinder.
In the resulting narrow space between the walls of the two cylinders, the inventor poured liquid oil. Of course, that part of the structure in which this heat-transfer fluid was placed was carefully sealed to prevent leakage of oil.
This is a diagram of the very first Frenett heat pump version The rotating shaft is located horizontally, the coolant is placed in a narrow space between the two working cylinders (+)
The inner cylinder is connected to the motor shaft in such a way as to ensure its rapid rotation relative to the stationary large cylinder. A fan with impeller was placed at the opposite end of the structure.
During operation, the oil was heated and transferred heat to the air surrounding the device. The fan made it possible to quickly spread warm air throughout the entire volume of the room.
Since this structure was heated quite strongly, for the sake of convenient and safe use, the structure was hidden in a protective case. Of course, holes for air circulation were made in the casing.
A useful addition to the design was a thermostat, through which the operation of the Frenett pump could be automated to some extent.
The central axis in such a heat pump model is located vertically. The engine is at the bottom, then the cylinders nested into each other are installed, and the fan is on top. Later, a model appeared with a horizontal central axis.
A Frenett heat pump model with a horizontally oriented rotating shaft was used with a heating radiator inside which heated oil circulated (+)
Such a device was first used in combination not with a fan, but with a heating radiator. The engine is placed on the side, and the rotor shaft passes through a rotating drum and goes outside.
There is no fan in this type of device. The coolant from the pump through the pipes moves to the radiator. Similarly, the heated oil can be brought to another heat exchanger or directly to the heating pipes.
Later, the design of the heat pump Frenetta was significantly changed. The rotor shaft is still in a horizontal position, but the inner part was made of two rotating drums and an impeller placed between them. Liquid oil is again used as the heat carrier.
In this version of the Frenett heat pump, the two cylinders rotate side by side, they are separated by a special design impeller made of very strong metal (+)
During the rotation of this design, the oil is additionally heated as it passes through special holes made in the impeller, and then penetrates into the narrow cavity between the walls of the pump casing and its rotor. Thus, the efficiency of the Frenett pump has been significantly increased.
Small holes are made around the edges of the impeller for the Frenett heat pump. The coolant heats up quickly and efficiently, passing through them (+)
However, it is worth noting that this type of pump is not very suitable for home production. First you need to find reliable drawings or calculate the design yourself, and this is only an experienced engineer.
Then you need to find a special impeller with holes of a suitable size. This element of the heat pump operates at elevated loads, so it must be made of very durable materials.
Independent manufacture of the device
The review of the Frenett pump device variants allows us to understand that the principles of its operation with a varying degree of efficiency can be used in constructions of various types and types. The basic idea remains the same: a narrow space between metal elements, filled with oil, and rotation with an electric motor.
The diagram shows a variant of the Frenett heat pump, which is usually used for self-fabrication of the device. The basis of the design - metal discs, separated by nuts (+)
At home, the Frenette pump is most often made of a series of metal plates separated by a narrow lumen.
To make such a device you need to prepare the necessary materials:
- hollow metal cylinder;
- a set of identical steel discs with a hole in the center;
- set of nuts with a height of 6 mm;
- threaded steel rod:
- electric motor with an extended shaft;
- connecting pipes.
Pump sizes may be larger or smaller. But the distance between the discs should be kept exactly - 6 mm. Standard nuts are used as dividers, and the steel bar is the center of the structure.
Its thickness must match the diameter of the nut. If the threaded rod was not at hand, it would just have to be cut.
The metal discs for the Frenett heat pump should be slightly smaller than the diameter of the cylindrical body to ensure free rotation and more efficient heating of the coolant
Obviously, the hole in the discs must be such that they can be freely put on the axial rod. The outer diameter of the discs should be a few millimeters smaller than the body. If there are no ready-made elements at hand, the discs are cut out independently from sheet metal or entrust this work to a turner.
Steel discs for the Frenett heat pump can be cut at home if the right equipment is available.
The cylindrical body can be made from an old metal container of a suitable configuration or it can be welded from metal. Fit and trim a wide metal pipe.
Walls are welded to the ends of the cylinder. The body must be sealed so that the oil does not leak. Additional openings should be made in the upper and lower ends of the case: for the inlet and outlet of the heating pipes leading to the radiator.
Of course, all pipe joints should be sealed. For threaded connections use special seals: FUM-tape, flax, etc. If decided use polypropylene pipes, you will need special fittings and, possibly, a soldering iron for the installation of such pipes.
A high-performance electric motor is not needed to operate the Frenett pump. A device removed from an old or broken household appliance, for example, from a conventional fan, will do.
The main purpose of the electric motor is to rotate the shaft. Excessively fast rotation can lead to incorrect operation of the device. The faster the design rotates, the more the heat carrier heats up.
A small motor for rotating the shaft of a Frenett heat pump can be removed from damaged household appliances or purchased at a store
To rotate freely, you need a suitable bearing of standard sizes. When all the elements are prepared, you can begin assembling the device. First, a central axis with a bearing is installed on the lower part inside the housing. Then a separating nut is screwed onto the axle, then a disk is put on, a nut is again, a disk again, and so on.
Disks with nuts alternate until the body is filled to the top. Even at the preparation stage, preliminary calculations can be made on the number of required discs and nuts.
It is necessary to add the thickness of the disc to the thickness of the nut (6 mm). The height of the body divided by this figure. The resulting number will give information about the required number of pairs “nut + disk”. Last set the nut.
After the body is filled with these moving parts, it is filled with liquid oil. The type of oil does not matter, you can take mineral, cottonseed, rapeseed or any other oil that tolerates heat well and does not freeze. After that, the structure is covered with the top cover and carefully brewed.
At this point, the radiator pipes are already usually attached to the covers. For convenience, during further installation and maintenance of the device, two shut-off valves can be installed on the pipes. Now you need to attach the axis of the heat pump to the motor shaft.
The system includes a network, check for leaks, evaluate the characteristics of the device.
A Frenetta self-made heat pump can be connected to a conventional cast iron or bimetal radiator that will provide the necessary heating effect.
If everything is done correctly, the axis with the disks will begin to unwind, warming up the oil inside the device. Hot coolant will move through the upper hole through the pipe into the radiator. The cooled oil will return to the heat pump housing along the bottom pipe for re-heating.
To automate the system, you can use a special relay with a thermal sensor, which fixes the heat of the heat pump body and turns off the engine or turns it on as of necessity. This will prevent overheating of the system, damage to the electric motor and generally increase the service life of the device.
Conclusions and useful video on the topic
An interesting version of the Frenetta pump is presented in this video:
Unfortunately, the Frenetta pump did not find widespread acceptance in the field of heating. Such a device of industrial manufacturing for domestic needs is difficult to find in stores appliances for the home. But quite a few craftsmen successfully used the work of this scientist and applied them in their dwellings, baths, garages, etc.
Perhaps it is you who are the very self-made, who managed to embody the idea of Frenett? Please share your experience - leave comments on the article and add photos of your products. Contact form is located below.