en SEMI servis s.r.o. | Construction activities, earthworks, water & topo & gas, electricity, transportation, Ekoreg + & MC

Heating & Plumbing & Gas

Our company has years of experience in heating, especially in the field of gas boilers and gas installations . This activity is carried out by our permanent staff - skilled professionals from the very beginning of the company , which dates back to 1991. Provide a complete hot and cold water - plastic, copper, metal , stainless steel , renovation of bathrooms , installation of all sanitary ware, bathtubs, shower enclosures , suspension systems , plumbing, indoor and outdoor sanitation , complete delivery and installation of central and underfloor heating , installation of floor convectors , installation of boilers , boilers supply and installation of gas, electric and solid fuel boilers , high-pressure and low-pressure steam distribution systems , and industrial distribution systems for the chemical and food industries. Manufacturers and brands Our services include the sale and installation of boilers of different brands. You can choose from our wide selection. You will find more than 15 manufacturers of various types of boilers . Our main suppliers are Viessmann , Buderus, Vaillant, Protherm. A heat pump is a machine that draws heat from one place to another exerting external work. Usually it's from a cooler to a warmer place . Heat pump principle is the basis of a number of machines and equipment - fridge , freezer , air conditioning , and some forms of heating. The most common type is a heat pump compressor . It works on the principle of reverse Carnot cycle (NB Direct Carnot cycle is used in heat engines ) . The refrigerant in the gaseous state is compressed by the compressor and then admitted into the condenser. Here surrenders its latent heat. Condensed refrigerant passes through an expansion nozzle into the evaporator where the latent heat (at a lower pressure and temperature) receives and evaporated . Then again, goes to the compressor and the cycle is repeated. One of the characteristics of the work of the heat pump is heating factor .

Figure 1: The principle of heat pump - schematically


HJeat from the ground is transferred to the water circulating antifreeze liquid of low boiling point . The gaseous collects heat stored in the pipe into the borehole or into the collector below the surface. The compressor circuit is included to achieve the desired high temperature.


In a plastic tube, a few hundred meters long ( ground collector ) , runs very cool antifreeze in the gas phase , which is heated by passing countries ( in frost-free depth is a constant temperature of about 4 ° C). Here goes into the compressor , where the gas is compressed , and thus significantly heated to a temperature higher than the demand for water. From here the hot gas flowing into the heat exchanger where the water that passes heat gain is gradually cooled to condense and thus the liquid head back to the collector , which is also the evaporator , where the expansion , i.e. gasification substantially cooled to a temperature much lower than the temperature in the collector and when passing through the collector is heated up again .

Heat pumps for heating

Characteristics of heat pumps is their relatively limited power if they also remain economic. A few years ago , the vast majority of new buildings to energy- intensive heating twice .

With the advent of new materials , insulation technology , efficient management system with heat and especially the advent of low-energy buildings today require buildings to run much less heat than the past. Current heat pump technology remains the same since their discovery almost the same ( principle is known for over a hundred years old ) , but it is possible to design a much smaller and cheaper devices that can seamlessly normal house stock up. In addition, the rising prices of alternative sources of energy role of these devices due to significant return on investment is growing .

Today is a heat pump equipped with almost every tenth new building.

Standardly are used these heat pumps :

Figure 2: Types of heat pumps (left - country [bore] / water, water / water, earth [areal collector] / water)

Heat pump / water

Subscribe low potential energy from the earth can be printed using the horizontal collector or a vertical borehole. The 1 kW heat pump performance you need approx 12 m borehole. Routine one borehole depth is 100-150 m , if it is necessary for the heat pump deliver more energy removes heat from several wells. In general we can say that the 1 kW heat pump performance you need approx 30 m2 plot. price from about 130 thousand . heating capacity of about 7 kW. For the borehole to be reckoned with his regeneration, this could result in the exhaustion and freezing. After that, it is usually not possible to use the well !

Heat pump air / water
Heat is taken from the air through the evaporator of the heat pump , which flows through the outdoor air. The advantage of this device are low cost and easy installation . The base is based on a heat pump air / air thus classical conditioning . The system is complemented by the so-called hydraulic module which transfers the heat to the heating water . The disadvantage is the dependence of COP of the air temperature . Nowadays, these devices effectively operate down to -15 degrees Celsius. At lower temperatures, the Hydroboxes installed a small electric boiler , heat pump which helps to achieve the desired water temperature. Currently , this method of heating buildings considered together with condensing gas boilers for the most economical .

Heat pump water / water

Extracts heat from the water , most wells. It is necessary to have two wells pumping and seepage . Water is transferred from one well to another through the evaporator . This method is here basically not due to the complexity of the conditions and maintenance. It may well be exhausted .

Heat pump air / air

As heating source should be treated with caution , these systems are usually designed primarily as an air conditioner , but that in winter it can work in reverse , ie as heat pump . It is particularly suitable for heating during spring and autumn .

Modern heat pumps

They have a frequency converter - stepless power control and electronic expansion valve ( EEV) , such as air , water system AC Heating , PZP , nucleons and SAMSUNG . The heat pump is called a doubleword , where the first word ( before the slash ) indicates the source from which the energy is drawn and the second word refers to the heat transfer medium.

Figure 3: Other types of heat pumps - air / air (different variants)

Energy sources

* Country - geothermal energy stored in rocks or accumulated solar energy in the upper layers of soil. It is used for pumps / water
* air - used for air / water and air / air
* water - mostly groundwater from a borehole, which is cooled in a heat pump and other borehole is coming back into the country. It is used for heat pump water / water

Heat exchange medium

* water - usually a hot water used for heating domestic hot water, swimming pools, radiators, underfloor heating, swimming pools and much more
* air - or hot air heating