Archive for April, 2012

Advantages and disadvantages of electric heating floor

Apr 26

Posted by Edmundo Plumber in Electric floor heating | Comments off

“Warm Floors” – maybe it’s just sweeping the race for fashion? How to decide for themselves whether such a system need heating or best to stick to more traditional means, and time-tested?

In order for the decision was justified, we must weigh the “pros” and “against”. On the merits and demerits of the electric heating floor, read this article.

electric heating floor – is the floor, laid by a suitable floor covering, which is built at the base of a water or electric heating system. Immediately, we note the advantage of both the electric and water electric heating floor. The heating system includes the appropriate hardware management and temperature control and allows not only to maintain a constant temperature in the room, but to change it during the day for a given program. Heated floors create a comfortable indoor temperature distribution with height. Legs are always warm, and above – a zone of lower temperature. Another and important advantage of these systems is the lack of visual heaters that for many, opens up a whole range of possibilities for a new design.

Now on to each system separately. Electrical system electric heating floor includes several types of cable, and film termomatovuyu. Choice – it’s good quality. But in this case, you must understand that the electric “heated floors” are intended to heat a small area of ??the room (bathroom, kitchen), otherwise all the advantages of the floor can very quickly become disadvantages. Primarily because of the large amount of electricity consumed.

Heating cables are laid in the necessary concrete floor, installation of installation is quite complex, and would be long – 28 days to dry completely. Set the cable should be selected a certain length, cut it, because the installation is impossible.

Few things are easier with a “warm” mat floors. Heating mats are thin cable systems. They can be packed into a thin layer of screed or tile adhesive.

Termomaty inexpensive and can be attributed to the mainstream systems, it is very easy to install, they can be put on its own, using the recommendations contained in the instructions. They are very convenient because by buying a set, you can cut the mounting grid and put only necessary for you to the ground. Note, however, only the net assembly, the cable is not cut.

For all its merits, the termomatov has its drawbacks. They can not be installed in areas where there is massive furniture (heavy cabinets, washing machine) and can be used only under certain flooring (tile, stone or granite).

In today’s market recently appeared film electric heating floor. This system consists of a durable and water resistant polymer film. It is more flexible and heat-resistant system, moreover, it is also the hyperfine – only 0.3 mm.

The merits of it, of course, weight. The floors of a Thermal economical to use, very easy to install, they are placed directly under the floor covering, floor is not needed here – and this is a very big plus. Also, the long-wave radiation are beneficial to human health. These floors can be installed under any floor covering, whether it be a laminate or hardwood floor that will not hamper you in choosing the material.

The disadvantage is only that the price of the film above the floor than the other, so the choice of the floor should be based on your physical abilities.

If the electric electric heating floor is only useful in small areas, the water system can warm and great footage. They can be installed in an apartment and a country house. Water the floor, we can say more economical. It has its advantages during installation and operation. The cost of installing a one-time, and during the operation can significantly save on electricity. However, it is necessary to add that line the floor of water can be made of galvanized or copper pipes. However, it is best to use a solid metal-plastic pipes, pipe joints to prevent leaks and unexpected, because in the solid piece of metal pipe you will be insured up to 100%. Water system sexes also highly resistant. Even with power outages, it will keep warm for a long time, about two days.

The disadvantages of this system include the difficulty of installation and design. A considerable thickness of the pipe causes the lift floor and ceiling height due to this, of course, is reduced.

The device heating in the apartment or house – it’s certainly one of the major issues of concern to each owner of the dwelling. Therefore, when choosing the system should be seriously and thoughtfully. The system electric heating floor is so versatile and diverse that everyone could choose the best option.

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Disadvantages of board panel heating usage

Apr 26

Posted by Edmundo Plumber in Radiant Heating | Comments off

Contrary to the opinion that the radiator dries the air more than a warm floor – answer: no. And not just rely on the subjective feeling of being in areas with different heat sources. The main argument is that the heat sink temperature is higher than the warm floor and so it dries the air – not true. Humidity is the amount of water vapor in it. As we know, water can evaporate as well as to condense, so the indoors of moisture does not depend on the heat source (in this case), but only from the air (ventilation) and water vapor permeability walling. But the concentration of vapor in each case is different. Do radiators, it is different from the wall to the center of the room and even more so, from the radiator to the center. The most active molecule of water on the radiator in the center they are larger and less mobile. Therefore, the concentration of moisture in the air is different. (Take for a height of 1.5-2m)

In floor heating and more uniform concentration of water molecules are active throughout the entire volume of the room. Given this, the total vapor pressure in the room, with heated floors, higher than the radiator, which means the loss of moisture through the walls and ventilation more. In conjunction with ventilation air into the room with a warm floor drier. And this is a disadvantage for furniture made of wood, leather and us humans. Recommended humidity in a room of about 55%. And in a room with a radiator, it is easier to maintain humidity. Therefore, the idea of ??the steam generator to warm the floor, you will visit soon.

Two. Dust.
We will not discuss, from where it comes from. But it attracts and holds dust, electrostatic voltage on the surface of objects. It’s all synthetic and painted surfaces. In the field of heating (See Finishing the floor) used materials do not hold dust. This is a great advantage with good ventilation but not least a big disadvantage in the natural or no ventilation. Dust is easily removed from the surface than in the air. In the field of heat efficiency of wet cleaning is much lower. This is due to the fact that water evaporates quickly. And with wet cleaning, it is the surface tension of water and should “pull” and how-to “glue” the dust of the floor surface, which would remove it on the second pass a damp cloth. At a short period of time efficiency drops to 10 times.

Also, the warm dust field land, and therefore lighter. Warm air rises from all over the floor surface and the concentration of dust in the air higher than the radiator. The argument that the movement of air over the radiator longer, and hence the more it raises dust, does not hold water. As I mentioned, dust, electrostatic voltage and keeps the heatsink without the fan is not able to lift the dust from all over the floor area that can not be said about the warm box. What is important is not the velocity of the dust, and its concentration in the air.

Three. Drafts.
Here we must pay tribute to the warm floor. With drafts he fights much better. That stream of warm air, aspiring to the floor, throws light not visible to you and me a draft, causing many unpleasant diseases. The overall winner in this category. Indisputable advantage if you have no door sills.

Physiology.
Here, several aspects of touch. Be on the field of heat for several hours not only comfortable, but also bad for health, and some are contraindicated. Patients veins (varicose veins), differential pressure (hypertension), asthma and allergies, not a complete list of contraindications.

After a hard day’s work when the legs “buzz”, swollen by the warm floor you will not get relief. Add to that our bodies get used to warm the floor. After all, no hothouse conditions are beneficial, for both children and adults.

About the children should be treated separately. Over the years, the circulation of people is deteriorating, we become less mobile, and we need a higher temperature for comfort. In children, the opposite. Being closer to the warm floor and in constant motion, with their good circulation they are not comfortable with (the lower, the higher the temperature). They sweat, become listless, tire easily, somnolence, but you can not explain what is happening to them so they do not understand this.

Conclusions:
The choice, of course, is yours. And if you come to mind, many of the disadvantages can be turned into advantages. Perfect solution is for the warm floor of rooms: All rooms in the basement with ventilation, swimming pools, toilets, hallways, common living rooms, utility rooms, garage and even a sauna, steam room.

Some disadvantages are deprived of a comfortable floor. In conjunction with radiators or air heated, they create a soft and flexible atmosphere in the room. These integrated solutions are more expensive and certainly not everyone can afford it. Therefore, making a choice between two evils, choose the lesser.

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Advantages of hydraulic well tanks Well-X-Trol

Apr 26

Posted by Edmundo Plumber in Brass ball valves, Plumbing supplies, Plumbing supplies, Water pumps | Comments off

Well tanks are used:

to maintain constant pressure in the water system;
protect the pump from the frequent inclusion of that resource increases the jet pump;
to reduce the chances of water hammer in the system;
for the issue of water storage on power in the network.

Consists of: a metal container (Well-X-Trol tank), which is located inside the membrane of food gums. The internal cavity of the membrane with a hole through the flange is connected to the backbone, and in the cavity formed by the outer surface of the membrane and the interior of the tank under pressure through the nipple pumped air. Installation fitting is designed for mounting of the Well-X-Trol , as well as to install a backflow preventer, ball valve or plug. Capacity of 50 liters and 100 liters.
Advantages of hydraulic well tanks Well-X-Trol

 

  • Accumulator tank is made of steel with thickness 0.8-1.0mm (depending on the size of the accumulator).
  • The lack of internal welds tank – no risk of damage to the inner membrane during operation.
  • Powder coating inside and outside of the steel tank prevents it from rusting.
  • The inner membrane is made of synthetic rubber (not made of natural rubber food), which provides greater durability.
  • The flange is attached to the bolts and nuts – very reliable accumulator.
  • Socket (for vertical tanks) with internal and external thread allows you to set all the automatic jet pump, as well as an automatic “purger” air from the water well tanks.
  • Automatic “purger” air from the membrane hydraulic tank is required for the following reasons:

In cold water entering the Well-X-Trol water well tank is from a well or a well, a large number of dissolved air. With increasing temperature the air released from the water and accumulates in the membrane.
If the water system is formed by air pockets, then this place develop bacteria that give the water an unpleasant odor.
In order to remove air from the conventional design of the membrane Hydraulic Tank must be disconnected, which is very time consuming.

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Existing methods of reducing the starting currents of jet pumps.

Apr 23

Posted by Edmundo Plumber in Grundfos pumps, Plumbing supplies, Water pumps | Comments off

Their implementation in the case of convertiblejet pumps Grundfos

As a rule, well pumps, the following ways to reduce the starting currents of pumps: direct integration; inclusion of the method of “star-triangle”, the method including the electric pump through a start-up transformer; smooth start and frequency converter When choosing a method of reducing the starting current should be considered part of the pumping equipment, technical requirements, as well as the rules and regulations of electric service.

The direct inclusion

When actuated, contactor or similar device connected to the network directly. All other things being constant parameters DÖL is the way to start, which occurs in the pump minimum amount of heat and thus have jet pumps up to 45 kW provides maximum durability. However, the electric power greater mechanical load is so high that it is recommended to lower currents.

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Method of setting the starting jet pump through a transformer

Apr 23

Posted by Edmundo Plumber in Plumbing supplies, Water pumps | Comments off

With this method, start-up the voltage is reduced by transformers (usually two), one for each phase. Transformers often have two network  output: one for the other 75% and 60%. If you use 60% of output is reduced starting current, similar to the method of launching “a star-delta.”

When starting the jet pumps gets the first low voltage, and then complete. When switching the transformer connected to a choke coil. This means that the pump always remains connected to the network and its rotation rate is not reduced. Power consumption at start-up is shown in the diagram. Start-up transformers are relatively expensive, but very reliable. Naturally, the inrush current is determined by the characteristics of the pump and pump, and depending on their sizes can vary considerably.

Soft start pump (SS)

A device for pump starter is an electronic device that reduces the voltage and inrush current, respectively, by phase control. The electronic device comprises adjusting unit, configured with a variety of operational and safety parameters and the power unit with a symmetric Triac. Inrush current is limited, as a rule, the value in two to three times the rated current. When you save the other options off the pump by this method also provides a reduction in the initial starting point. The presence of inertia in the process of start-up can lead to significant heat buildup in the pump and thereby reduce its service life. However, this problem with a short acceleration / deceleration time, for example, for 3 s, has no practical value. This statement also applies to pump launch on the methods of SD (the inclusion of a “star-triangle”) and AF (through the inclusion of start-up transformer). Thus, the operation of downhole pumps, Grundfos are advised to observe for the starter shown in the graph (Fig. 4), the acceleration / deceleration.

In that case, if you want a particularly high starting torque, starting voltage can be increased by 55%. However, under normal operating conditions is required.

For a smooth start-up switch allows the pump to supply non-sinusoidal current form and to some extent, creates higher harmonics. Due to the very short acceleration / deceleration from a practical point of view (and in the rules relating to the higher harmonics), it does not find much use.

In general, the starter switch is recommended to install a roundabout at the contractor to the pump during operation operated in DÖL. This ensures minimal wear and loss of power in the device to the starter. In that case, if the soft-start pump is made through a bypass contractor, they can work with the thermal protection system (Temrson).

Start by a frequency converter

Start the Floforce jet pump by the inverter is ideal from the standpoint of reducing the starting current, and pulse pressure. Diagram of the start-up.

The advantage of this method is that the inrush current at all times hold at the level of the nominal current. This means that the number of required hours for on and off can be set to any. In some models, such as SQ and SQE pumps feature soft start and stop due to the frequency converter is built for easy installation and operation.

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The negative factors arising from the use of electric convertible jet pumps

Apr 23

Posted by Edmundo Plumber in Plumbing supplies, Water pumps | Comments off

At the organization of water supply based on groundwater use technological modes of operation of water wells include convertible jet pumps starting modes, whose number can reach 30 puskovostanovok per hour (see Table. 1). Start convertible well jet pump is one of the worst regimes for their pumps, pipes and water-lifting of the well. Electric convertible jet pump at this time for a short time exposed to the peak load, as its start-up current, again, 4 – 7 times higher than the nominal value at a relatively low starting torque.

In addition, the jump start current creates a shock electromagnetic torque that is transmitted through the shaft of the engine to the pump impeller. Under such conditions, water-lifting the pipe string may be the maximum pressure fluctuation in the hydraulic shock, and in part – high values ​​of the flow of water into the well from the aquifer.

At the same time to start mode is characterized by two periods:

❏ first (t1 = 0,9-0,5 s), within which there are high velocities of water influx into the well from the aquifer at the top of the filter. Also, there is a sharp change in pressure, which violates the stability zone (there is sand);
❏ second (t2 = 1-5 s) under certain conditions, accompanied by a water hammer in the pressure pipe.

To eliminate the negative effects of transients that occur at the start of convertible jet pumps, technological schemes of equipment wells. They are based on the electric (using devices that change the number of revolutions of the pump), the regulation of water supply and hydraulic convertible jet pumps (with shut-off and control valves) principles. This article focuses on the electrical component of the solution to the problem and its impact on energy use of pumping equipment.

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