Category Archives: End elements

A new era of cooperation with Zent-Frenger

A new era of cooperation with Zent-Frenger

The German company Zent-Frenger is one of the world's best energy systems abroad and stands out for its professional approach and quality know-how. Since this year, we have become its partner and representative on the Czech and Slovak markets, which has allowed us to expand our range of products and services.

As a Geocore company, we have been operating on the market for 11 years. Since 2008, we have been trying to find the most suitable environmentally friendly and economical solution for our customers in the field of TZB (technical equipment of buildings) while contributing innovations that would ensure even greater quality and comfort for our customers. We are constantly working on these goals, so we decided to re-establish cooperation with Zent-Frenger, which has so far been represented on the Czech market by UPONOR. Thanks to this, we can boast of expanding our portfolio with new Zent-Frenger products.

GeoCore's Strong Partner

Zent Frenger has a long tradition since 1954. During that time, it had the opportunity to launch a number of technical innovations, including heating cooling ceiling technology , which made it a major pioneerand innovator in the industry. Since 1990, ithas also produced, among otherthings, its own heating cooling systems for steel, aluminium, plasterboard and special ceilings in Heppenheim , which are of great interest to customers. In addition to heating cooling ceilings, it also focuses on geothermal pumps see Geozent.

GeoCore and Zent-Frenger

Since January 1, 2019, we have a new foreign partner by our side, which means even more choice and tailor-made solutions for our customers and clients, from performance to design itself. Thanks to the greater variety of our assortment, we are able to find the right solution for every type of building, regardless of its size or technical equipment. On this basis, we can boast the largest selection on the market, not only in the Czech Republic, but also in Slovakia or Poland.

Together with Zent-Frenger Energy Solutions, we offer not only a large selection of interior elements, but also a comprehensive solution. We will help you with feasibility studies, advise you on the most suitable system and take on project management, production, assembly and commissioning – so you can rely on us at every stage of your project.

Take a look at our complete extended portfolio of Zent-Frenger heating cooling ceiling products, which will take care not only of the optimal temperature, but also of the right amount of fresh air, instlipation of modern technologies into the ceiling such as space sound system, lighting and taking care of the acoustics of the space all without unpleasant drafts as an absolutely quiet and comfortable solution.

We support cooperation with architects, designers, investors and developers. We look forward to further cooperation.

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Schwan Cosmetics invests in geocore technology future

Schwan Cosmetics invests in geocore technology future

Have you heard of the Schwan brand? Probably, but don't you remember what the brand is making? We'll give you some advice. If someone in your household uses a cosmetic eyeliner, it is very likely that you will find a symbol of a small swan on it. It is just a significant logo of this German brand.

Schwan as a leader in the cosmetics industry

Schwan was founded in 1865 and has been intensively involved in the cosmetics industry since 1975, when the first cosmetic pencil 'Schwan Eyebrow Pencil' was officially introduced. Among the first enthusiasts and customers was max factor cosmetics, which immediately caught up with the idea and took it to America. Since then, Schwan Cosmetics has become the leader of the global cosmetics market and is a professional partner of the cosmetics industry. The company is also a successful leader in sustainable innovation and it is important for it to create products that combine quality, aesthetics and responsibility.

The second largest production centre in Český Krumlov is expanding

Schwan Cosmetics is currently the world's largest manufacturer of wooden decorative cosmetics and therefore is constantly expanding its production halls. The second largest production centre of the company is located in Český Krumlov and in 2016 it began to expand with two new production halls. Schwan management approached us to provide radiant façade heating and cooling systems for the new halls. These are integrated into the column-like construction of glass facades of new production halls. The system is almost invisible in the interior and abounds in comfortable functionality without any noise. Thanks to the fact that we design it tailored for a particular façade, it is able to cover the total heat loss of facades and no additional heating elements are necessary.

Ecology and employee satisfaction as a top priority

Schwan Cosmetics has been investing in high-quality systems that do not burden the environment for a long time, and these include the system that we used in the hall facades. The effective solution we have chosen ranks among the most modern technologies with minimal environmental impact, while also contributing to the physical and psychological well-being of employees. This is precisely because of the radiation of heat or cold, not the blowing and swirling of air, which is usually the cause of diseases and allergies. The sustainability of the projects and the intention to make the day-to-day work of employees more pleasant have certainly come true in this case.

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Detailed comparison of ceiling radiant systems. Which one to choose?

Detailed comparison of ceiling radiant systems. Which one to choose?

In the past, we have dealt with the undeniable advantages and benefits of heating-cooling radiant systems in several articles. If you are interested in the general advantages of systems, read hereif you have a reconstruction of the house in front of you and are thinking about alternatives to heating and cooling your house, thisarticle, for example, can broaden your horizons. Heating-cooling radiant systems are the most efficient way of transferring heat. This is also why they are an ideal choice for energy-efficient buildings. In the following we will focus on system performance in relation to materials from which they can be installed.

Copper, aluminum or plastic?

Ceiling radiant systems can be purchased in several material variants. Material variants, or heat exchange surfaces, which serve as a heat exchanger in your interior (radiate heat or cold), have different performance properties and thermal conductivity due to their differentness. Before you start choosing a heating-cooling system, consider which material will be the most advantageous investment. For comparison, we have selected the most common ones that customers buy from us. It is a system made of plastic, copper and aluminum or a carbon (carbon) system. In addition to the common advantages of all, such as the invisibility of systems in the interior and comfortable functionality without any noise, they have different material properties, which we will focus on below.

System with plastic exchanger

Systemically, it is a plastic pipe in combination with a plasterboard. The cold/heat distribution pipe is either built-in or installed above the SDK plate. The system is designed for dry construction system with quick installation and is especially suitable for renovations. However, the disadvantage of the system is plastic pipes with problematic system life. This material is limited and temperature dependent. Usually the plastics from which ceiling exchangers are made do not have an oxygen barrier, so the systems are aeration and the metal parts in the hydraulic system corrode. Thus, the whole system must be separated by a heat exchanger, on which there are huge power losses, and the source must produce an even higher temperature for heating and an even lower temperature for cooling.

System with metal exchanger

The system, which consists of an aluminum-copper structure hidden above the plasterboard ceiling, is suitable for any architectural solutions. It can also be used to create sleepless floor-to-ceiling or island ceilings. Thanks to the fact that we design the system tailored for a specific room, there is no problem with the installation of built-in ceiling components. We also combine the system with special plasterboards with increased thermal conductivity and the possibility of noise absorption. Thanks to its consisting of plasterboards and metal construction, this system guarantees better performance and thermal conductivity than a system with a plastic exchanger.

Carbon exchanger system

This advanced system for floor-to-ceiling ceilings takes advantage of the metal system described above and pushes the limits of performance even further. The advantage is its structural lightness combined with high performance and excellent acoustic properties. In this case, the ceiling ceiling is composed of a carbon plate, with a built-in copper pipe for heat and cold distribution. However, the fundamental difference from the system with the plastic exchanger is here in the wiring material. Copper pipes have a long service life and great conductivity, which is also supported by the great properties of the carbon plate.

Comparison of performance and thermal conductivity of materials

If we would like to quantify the material characteristics of the system, we can briefly mention the performance and conductivity of the materials in the units in which these quantities are stated. The performance of the ceiling system, i.e. how it is able to transfer heat, is measured in Watts per m² (W/m²) and thermal conductivity in Watts per meter and kelvin. (W/mK)


Material Cooling power (%) Thermal conductivity (%)
Plastic 40 0,22
Aluminum 63 237
Copper 100 386

In the table we can see that plastic has the least suitable properties of all materials for heat-change areas. Its performance is up to 60% smaller than the carbon exchanger system, which has copper pipes. Thermal conductivity (again compared to the carbon system) does not even reach 0.06% thermal conductivity of copper.


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Women are colder than men

Why do women perceive temperature differently than men?

Why do women perceive temperature differently than men?

Surely you have experienced daily arguments in the workplace about opening and closing windows in a room where both sexes work. In short, women perceive temperatures differently from men, and there are several explanations why men and women feel comfortable at different temperatures.

At what temperature do women and men feel comfortable?

A study conducted by two Dutch scientists offered an answer to a question that many employees and employers are still looking for an answer to. Why, in summer temperatures, when men vehemently turn on air conditioning units, do women immediately reach for a sweater? According to the study, women feel the cold faster and are more sensitive to it. This is also because the thermal sensors found in the skin are more sensitive to the female body. A sample conducted by the researchers suggests that women are well at 25°C and men at 24°C.

Association with metabolic rate and body weight

The result is also related to the speed of female and male metabolism. It is responsible for the production of energy, including heat. On average, women have a lower metabolic rate than men. An important factor is body weight. Because men have a higher proportion of body mass than women, the male body is more easily able to generate heat, making men less sensitive to colder air than the opposite sex. In the summer months, men have a lower tolerance to hot weather, since their body produces more, metabolism heats up and accelerates.

When he signs up for the word air conditioning

Since air conditioning units are already the standard in most jobs and buildings, the problem is again how to set the air conditioner so that the air temperature suits everyone. In the article, we described that we are unlikely to reach the temperature suitable for everyone very easily. For some, the air conditioning will blow less, on the other more, and the cycle continues. In Geocore, customers with a similar problem are usually advised to use a system of comfortable end elements – so-called heating-cooling ceiling structures. This system does not heat the air but radiates to objects and persons in the room, and unlike standard air conditioning, it does not work with unpleasant air blowing, which reduces comfort and can cause health problems.

Heating-cooling ceiling construction technology

The surface temperature of the ceiling is 18°C, which is an acceptable temperature difference for the body due to the desired room temperature of 26°C (when cooling). For radiant ceilings, this parameter is best compared to other cooling systems, which is why this system is most comfortable. The economic advantage is also that the end element serves both heating and cooling. Other pluses are predictive regulation, which saves time and money in the transition period, i.e. spring and autumn, and last but not least, the possibility of individual regulation using your smartphone. You can read more about the system here.

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Design radiators? A nightmare and inetermible technology.

Design radiators? A nightmare and inetermible technology.

Surely you have encountered at some point in your life during the reconstruction of a house or apartment that designers, architects or assistants in specialized shops offered you design heating fixtures, in other words also design radiators. These facilities are usually characterized by an 'interesting look that will bring the interior to life.'

The look will soon get old

The truth is, however, that most of these bodies are tawy and rather than interesting, they are visually ugly and you will soon get tired of the interior. But we touched on the aesthetic aspects of the matter, let's explain how these unusual radiators 'save' energy and what their prospects are for the future.

How do (non)gentle radiators work?

Conventional radiators, as we know them, save about 20% of energy today. Today, however, other technologies are moving theworld , which we know are capable of saving up to50% of energy. The principle of a normal radiator is still the same, a small area that heats air at a lower temperature to air at a higher temperature. The problem is that the reduced temperature that goes into the radiator, as a rule, needs a large amount of electricity for the air at the desired temperature in the room to circulate. In order for this to happen, you need to use fans to do the job. However, the savings are then replaced by the work of fans, which in most cases these design heaters need to function.

Noise, dust and complex maintenance

The disadvantage is also the unwanted noise that fans produce and the swirl of dust, which is not especially appreciated by allergy sufferers. The noise of these heaters or radiators can become very unpleasant, especially if we have a radiator installed in the room where we sleep. It is known that when falling asleep we are very sensitive to any, even slightly noisy stimuli from the outside, and therefore we should rather avoid installing noisy devices in these places. Over time, the way these radiators are cleaned can also become inconvenient. Dust settles in the body, and cleaning it can become a nightmare of regular household maintenance.   


What are the starting points and possibilities? There will come a time when none of us will want a radiator indoors. We already know several ways to avoid installing a radiator in the interior and thus avoid the complications that these devices bring. The design that gets tired, excessive dust swirling and inconvenient maintenance are reasons why we should consider our decisions several times during further reconstruction.

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Prague 7 is moving with the times. The town hall will have ecological cooling and heating.

Prague 7 is moving with the times. The town hall will have ecological cooling and heating.

Prague 7 is eagerly awaiting its new townhouse, which is scheduled to be completed in early 2019 and will be located at U Průhonu 38. Prague 7 will probably pay 213 mi.l excluding VAT for the reconstruction, the return on the total investment is about 16 years.
An international architectural competition was announced on the proposal, which was evaluated by an international jury composed of several experts. Among them, for example, was the Belgian architect from the V+ studio, Jörn Aram Bihain, who pointed out that the project of finding an architectural solution is not only a search for an architectural answer, but also a political one. He also pointed out that on such issues, not only the expectations of the contracting authority are important, but also of other interested people – employees, visitors, voters.

A winning solution?

The competition was eventually won by the Prague Association of Architects Atelier bod architekti s.r.o. In particular, the jury rated the simplicity and clear expression on the proposal positively, which very well underlines the importance of this public building. At the same time, the approach to reconstruction respects the existing construction of the building and the context in which it is located. After completion of the reconstruction, the building of the new town hall will have a total floor area of 5,500 m2, of which 4,600 m2 of usable area. There will be 202 jobs in the building and another 230 for visitors. The town hall will be equipped with an underground multifunctional hall for more than 100 people, a café on the ground floor and a multifunctional meeting room on the roof overlooking the whole of Holešovice. For the first time in its almost 130-year history, Prague 7 will acquire its own town council building.

Geocore will supply a heating-cooling ceiling ceiling to the town hall house overlooking Prague's Holešovice.

We will supply our heating and cooling system to the new town council house, which will provide 100% comfort for workers, clients or visitors. Our system guarantees pragmatic design combined with high performance and maximum possibility of aesthetic individualization. At the same time, it is absolutely quiet, thus contributing to a concentrated atmosphere and thermal comfort in the room for all present. If you are a resident of Prague 7 and your visits to the local authorities frighten you, we dare to say that the new town hall will be a pleasant space for both employees and residents.

Gallery of the winning design

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How to avoid colds from air conditioning in summer?

How to avoid colds from air conditioning in summer?

The hottest season of the year is here and with it the problems associated with air conditioning, which 'make' our hot working days more enjoyable. Have you ever encountered coming home from work after a busy day and having a cold the next day? In a summer where everyone would think it's almost impossible to get a cold? This summer cold usually comes from the sharply cooled office space in which we move. We have given you some explanations as to why this is the case and how to avoid it.

What does heat and cold do to the air?

You probably always thought that the heat was rising and the cold was falling down. But the claim is not entirely correct. It is more correct to say that warm air rises upwards and cool air falls down. We'll explain it in a simple example. If we imagine a hot air balloon, we realize very quickly how the mechanism works. Warm air is steered into the sail, which immediately begins to lift the shell and float it. If we stop heating the air, the shell will begin to sink to the ground. This is a natural and immutable mechanism that works and is verified.

Classic air conditioning works the other way around than it should.

Let us now translate the like-up we used in our example to something we all know well. We spend our working day in a classic openpac, and from above the air conditioning blows on us, when the sharply cooled air falls directly to the ground (from there we know such an unpleasant phenomenon for ladies, cold from the feet). Now imagine that you are in a wine cellar, where you are pleasantly cooled by the cooled walls in the space. What's more pleasant? Air conditioning blowing or cooler radiation in the cellar? I'm sure we can all agree that B). On this principle, radiant cooling systems work, the bodies of which cool down and then radiate the cold evenly into the space and without temperature shocks.

Solution? Natural airflow.

Do you think if you turn on the air conditioning in the summer, in a room where it's hot, you'll feel better? Yes, if you let the classic air conditioning blow on you all day, you will feel colder, but it is very likely that after such a day at work, you can just lie down in bed with tea for a week. The healthiest and most natural way of cooling in this case is natural flow, which can be achieved with radiant technology that works with smaller temperature differences than conventional air conditioning.

Air conditioning cools the air with water, which has a very low temperature (6°C) compared to outdoor air, causing us to feel unassuged in air-conditioned areas, we have a cold and such sharply cooled dry air does not allow us to breathe comfortably. Radiant technology works with water at a significantly higher temperature (18°C) and is thus closer to summer temperatures. Thanks to the fact that the temperature shocks for the body are not so great, then we can then function all day without having a cold and breathing dry air all day.

Comparison of heating and cooling systems

Air conditioning (fan-coil)

Underfloor heating/cooling

Ceiling heating/cooling

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GeoCore helps European science and GNSS research (Part 2.)

GeoCore helps European science and research. (Part 2.)

In the previous article, we mentioned the Agency for the European Global Navigation Satellite System (GSA), which is based in Prague's Holešovice and where we supplied a heating-cooling ceiling to the main meeting room. The meeting room is a pivotal place for scientists, as it is a place of important meetings, conferences or international transmissions. In this article, we will therefore focus more on the technical specifications that the project involved.

Difficult demands and fighting the place.

And how did it all start? Architects and authors of the modernization of the building for GSA Milan Rejchl, Josef Pospíšil and Martin Perlík originally planned to deliver classic heating and cooling systems, such as air conditioning units, to the room. Demands have been made for high performance, both heating and cooling, as well as for perfect acoustics, as it is a lecture hall. When it came to construction work, it was found that under the ceiling there is a complete infrastructure for the whole house and there is simply no room for air conditioning units. In the ceilings there was existing air conditioning, heating and cooling. And then we came to design the system. 

What was the system needed for in the conference room?

As we indicated in the previous article, the functionality and advantage of the system lies primarily in the radiant effect, which brings noticeable savings in operating costs. However, it is important that the very environment in which scientists work every day is comfortable. Our heating-cooling system guarantees a free environment and is a positive benefit for workers, who can operate carelessly in the premises every day without being forced to work in conditions that do not meet health standards.

An element that will heat and cool while complying with acoustic requirements.

It turned out that we had 3 cm of space left in the ceiling for our element, which we should have delivered to the meeting room. A three-centimeter element that must be heated, cooled and at the same time understand the acoustic requirements. At first it seemed an impossible task, so we started to look at it more and finally managed to design, provide and implement the element. It seemed to be won, but as it happens, there was another problem, namely that while we designed and manufactured the element, the layout of the room changed and we had another nut to crack. It should be mentioned that the panels are made to measure and were ordered, of course, before they were assembled. We had to measure the structures to fit the existing wall and columns and imagine what the system would look like when it was done. It should be noted that we focused in relatively difficult conditions, when the room was almost in a dissolute state.
What exactly was it about? In the final stage of the modifications, one wall of the room had to move 10 cm closer, and according to the architect's instructions, the originally designed spacing between the cassettes had to be observed for visual effect. In the end, however, this was solved thanks to our experienced technicians and we have another successful project behind us.

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GeoCore helps European science and GNSS research (Part 1.)

GeoCore helps European science and research. (Part 1.)

Are you interested in space technology and navigation systems? That's certainly how you know Galileo, the GNSS navigation system, which is similar to America's widely used GPS. And if you do not know, you should definitely know that Prague has been the seat of the Agency for the European Satellite System for 5 years. Since 2012, when the Agency for the European Global Navigation Satellite System (GSA) moved its headquarters to Prague, the direct contribution to the Czech economy has reached CZK 800 million. The Czech Republic mainly benefits from cooperation on projects for the development of satellite navigation applications.

How can a satellite be beneficial to humans? Cheaper food!

Do you think the impact of such a system is negligible for an ordinary mortal? You're wrong. Navigation systems affect our daily lives more than you think. Smartphones, which are the main segment using services based on their own location, are the dominant position. Other devices include, for example, car navigation. However, GNSS applications in fields such as transport, agriculture or infrastructure are numerous. In agriculture, satellite data allows agricultural machinery to be used to make food production as efficient and cheaper as possible. The benefits will then be reflected, for example, by reducing fuel costs.

And how did we contribute?

The Agency for the European Satellite System is located in a building in Prague's Holešovice, where we supplied the researchers with a cassette heating-cooling ceiling to the main meeting room. It serves primarily as a place for important conferences, international broadcasts and long-distance discussions. Demands have been made for high performance, both heating and cooling, as well as perfect acoustics. And what is such a ceiling for in a meeting room? The functionality and advantage of the system lies primarily in the radiant effect, which brings noticeable savings in operating costs. 

Comfortable solution without classic air conditioning.

What we consider, but very important, is the very environment in which scientists work every day. The comfortable, airless environment guaranteed by our heating-cooling system is a positive benefit for workers, who can operate carelessly in the premises every day without being forced to work in conditions that do not meet health standards. By this we mean especially classic air conditioning units, which, especially in the summer period, are unpleasant with characteristic drafts and noise. We are happy to help projects that we consider important and prove that such projects belong to the Czech Republic in this way!

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Alternative of thermal or air conditioning units

A comfortable alternative to thermal or air conditioning units? Choose any surface material and get rid of the interior of unsightly heating bodies and cooling units.

Comfortable, quiet, economical, gentle... Words you probably hear a lot from clients. Increasing demands on environmental well-being, i.e. thermal comfort of people, are an increasingly common topic in society. Whether it is the design of a family house or office space, thermal comfort is obvious and hygienic aspects are the one that will surely interest your clients. Side effects? Noise and frequent diseases caused by drafts and swirls of dust? Both can influence the choice of heating-cooling system, which allows the adjustment of thermal comfort at low energy consumption. Of course, the emphasis is also on the appearance and unpretentiousness of maintenance. How to achieve such requirements?

Radiant ceiling systems

The most common radiant cooling systems are cooling ceilings, which are given the most attention. And not in vain. The advantage of the system is its invisibility in the interior, high performance and comfortable functionality without any noise. Our systems replace any other unsightly heating or cooling units and rank among the very gentle, quiet and free-flowing cooling. For example, Carbon S boards with built-in copper heating-cooling equipment form a ceiling area and can be used to create sleepless floor-to-ceiling or island areas.

Advantages of the Carbon S radiant system

How is the system economically advantageous? From the point of view of thermal comfort, the system is economical mainly due to the fact that it works with the temperature that is most close to the temperature in the room and the power is thus distributed in the ceiling area and transmitted by radiation. Radiation is a physical process in which a substance emits energy into space in the form of electromagnetic radiation. It is precisely in conjunction with maintaining a lower air temperature that the systems are undeniably gentle. The reason for this is the low-potential effect, which is that it is not necessary to heat the water, which is usually driven into conventional radiators, to 60°C, but half the water temperature is enough to heat the room. The systems are especially suitable in combination with geothermia, where additional funds for operation can be saved.

As a rule, the disadvantage of the system is higher acquisition costs. On the other hand, the cost of replacing filters for conventional systems, for example, is falling away, and the unit is very comfortable precisely because it has one element that heats and cools. At the same time, the system is up to 60% lighter, achieves 35-50% higher performance, and the system response is 10 times faster (1-2 minutes). It is not possible to say unequivocally what the return is, since, as you know, each project has its own specifics according to which these figures are estimated. We will be happy to help you calculate these numbers and advise what system would be suitable for your project. Contact us and get advice from specialists.

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