The circulator pump is used to circulate water in cooling and heating systems to supply the refrigeration and thermal load of the building and cooling towers. In the following, the information on the estimation of flow rate, brands, how to check, and the prices of all types of circulator pumps is presented.
In general, a circulator pump circulates cold or hot water in the building's air conditioning or central heating systems from the place of production to the places of heat exchange in cooling and heating devices. They are usually used in small and medium-sized buildings with a lower speed (up to about 1450 RPM).
In other words, after providing hot water in the central heating boiler and also providing cold water in the refrigeration cycle of the chiller (or other cooling systems), a circulator pump circulates this water in the pipes to the radiators, fan coils, air generator coils, etc.
Circulator pumps are only used to circulate the water of the cooling and heating system in the circuit of this equipment, so the water is riding on their impeller, and they do not need the ability to suck water from lower levels (such as irrigation and water supply pumps).
Depending on the installation location, there are two main categories of circulator pumps namely inline circulator pumps and end suction circulator pumps. Each type has its advantages and disadvantages, and the choice depends on the specific requirements of the application:
Inline circulator pumps are known for their compact design, while they are installed in-line. This means that the flow path passes through the pump and they are suitable in housing conditions of limited space.
This design also results in lower noise levels and vibration when compared to end suction pumps and they are easily accessible.
However, inline circulator pumps have their downsides, as they tend to have lower flow rates than end suction pumps.
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End suction circulator pumps have a different design where the suction inlet will be on the end of the pump casing. End suction pumps are installed vertically and/or horizontally but need extra pipelines and fitting.
The end suction pumps are usually characterized by higher flow rates and lower pressure drop compared to inline pumps.
However, end suction pumps are less compact, more noisy, and have complicated assembling and maintenance.
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The components of the circulator pump are as follows:
The electric motor plays a key role in the operation of the circulator pump and is responsible for converting electrical energy into mechanical energy to move the pump impeller. These motors can work with single-phase electricity (at low powers) or three phases (at high powers).
The rotation speed of the motor is between 1450 and 2900 RPM, which is selected based on the system requirements and the model of the electro pump. This engine provides the necessary driving force to move fluid in heating, cooling, or air conditioning systems.
Coupling is responsible for connecting the electric motor to the pump shaft. This piece plays an important role in transferring mechanical power from the motor axis to the pump impeller axis and can also absorb shocks or fluctuations caused by the motor, which helps to increase the useful life and efficiency of the pump.
Couplings are usually made of cast iron or brass, which prevent the erosion and burning of electric motors.
The main role of the shaft is to transfer the rotary motion from the electric motor to the pump impeller. This part is usually made of steel or stainless steel to resist corrosion and wear.
The shaft is supported by bearings that help reduce friction and ensure smooth movement of the shaft, thereby increasing the useful life of the pump. The shaft is directly connected to the impeller and turns the rotation of the motor into the driving force necessary for the fluid flow in the system.
Bearings in circulator pumps are responsible for keeping the axis (shaft) in place and preventing its unstable movement, as well as minimizing the friction between the axis and the pump body.
Bearings are usually made of bronze, each bearing has a special groove for lubrication, which provides constant and continuous circulation of oil on the surface of the bearings. These grooves help reduce friction and prevent overheating, contributing to optimal performance and longer pump life.
This part is responsible for preventing fluid from leaking out of the pump and also preventing air from entering the pump. A mechanical seal or felt bowl is placed between the shaft and the pump body and prevents liquid leakage at the connection points by creating a tight seal.
The mechanical seal plays a very important role in maintaining the internal pressure of the flowing fluid in the pump and its efficiency, and it helps to prevent breakdowns caused by leakage and corrosion of the pump. In high-quality circulator pumps, the seals or seals are usually of the Borgman type from Germany or BT from Italy.
The impeller is the most important component of circulator pumps whose task is to transfer and move fluid at the required pressure or head.
By converting the mechanical energy of the engine into kinetic energy, this rotating part moves the desired flow rate of the fluid and directs it from the inlet to the outlet of the pump with pressure and also prevents air from collecting in the pump felt bowl.
Impellers are made of different materials such as steel, brass, compressed plastic, and aluminum alloy according to the need, each of which is selected depending on the application, corrosion resistance, flow rate, and pressure required by the pump.
The type, material, and dimensions of the pump impeller directly affect the transfer of flow volume and pressure or the head of the circulator pump.
In circulator pumps, the body acts as a housing that houses other pump components. This part is usually made of corrosion-resistant materials such as cast aluminum alloy, cast iron, or steel to withstand pressure and different working conditions.
The body of this pump also provides the fluid flow path and helps to direct the fluid from the inlet to the outlet of the circulator pump, which is necessary for the optimal performance of the pump.
The final piece, which is essential for installing any inline circulator pump on the return pipes of the heating system and the outgoing pipes of the cooling system in engine houses, is called the gear nut.
The spool nut of each inline pump with the size of the diameter of the inlet and outlet pipes of the circulator pumps is installed on the sides of the pump on the corresponding pipe.
In general, at each section of the heating system, by dividing kilocalories by 2500, the flowrate (GPM) or circulating water volume of the same section of the heating system is obtained (to calculate the diameter of the pipes and the required flowrate of the circulator pump).
Hot Water: Kcal / 2500 = BTU / 10000 = GPM
Also, by dividing the kilocalories of each section of the cooling system by the number of 1250 flowrate (GPM) or the volume of water circulating in the same section of the cooling system is obtained (to calculate the diameter of the pipes and the required flowrate of the circulator pump).
Cold Water: Kcal / 1250 = BTU / 5000 = GPM
Here are the 8 points to keep in mind when calculating the pressure of a circulator pump:
Considering that many buildings have a total floor area of less than 2,000 square meters, determining the type or model of the water circulation pump for the heating system of those buildings does not require a complex calculation.
As a general guide based on the model of relative pumps, we present the popular Semnan Co. circulator pumps for buildings up to 7 floors.
To calculate the circulator pump head, two main parameters must be considered: Pressure drop in the pipes and fittings + length.
In circulator pumps the vertical height at which water must be pumped up or down from the engine room to other floors of the building, as well as the pressure drop in the piping and fittings, greatly impact the calculation of the pump head.
The vertical height (due to the return of water to the same height) is usually not considered an independent parameter. The main focus is on calculating the pressure drop of the pipes, fittings, and heat transfer coils of installation equipment such as coils, fan coils, air conditioners, and even boilers and radiators...
To calculate the circulator pump head, you must consider the total pressure drop along the piping route, + the pressure drop of the fittings, heat transfer coils, and other heating and cooling equipment in each route. The general formula for calculating the head of the circulator pump is as follows:
H = H-pipe + H-junctions + H-equipment
L-effective = L × 0.5
Assuming that the pressure drop in the water flow of the pipes according to engineering tables is about 2.5% of the path length.
H-pipe = L-effective × 0.025
Note: Cooling tower pumps, which are responsible for the flow and movement of water from the condenser of water chillers to the cooling tower location on the roof or building site (based on the location of the cooling tower installation), are considered circulator pumps with a speed of 1450 RPM in pump head calculations.
Circulator pumps are usually installed in the return water circuit of cooling or heating systems. In other words, they are placed before the central heating boiler in the heating systems and before the chiller in the cooling systems so that the water output of the circulator pumps in the heating systems enters the boiler and then is distributed to the radiators and fan coils.
Then, the water output of the circulator pump enters the chiller evaporator and then enters the fan coil and air conditioner coil. To return the unused hot water in the building's hot water piping, it is necessary to install the hot water return pump before the coiled or double wall tank on the hot water return pipe.
Usually, the hot water return pump used for the double-walled tank or even the spiral tank is considered to be a 1-inch or 1/4-inch Grundfos, DAB, or WILO brand inline pump.
According to the recommended standards of facility engineering, in buildings with 8 or more units, it is necessary to consider a "reserved" circulator pump with the same power, head, and flow rate as the main pump.
It is better to separate the function of the hot water circulator pump of the heating (or cooling) system of the building with the circulation path of the hot water feeding the boiler in the source of the coil; for each of the two paths, for better exploitation in different seasons of the year, a separate circulator pump should be installed.
In general, the off-on operation of the circulator pumps is done by the wall thermostat installed on the return water pipe of the heating (or cooling) system.
The temperature setting of the wall thermostat installed on the suction pipeline of the circulator pump should usually be about 5 degrees Celsius lower than the set temperature of the submerged thermostat of the building's engine room hot water boiler.
It is necessary to install a filter in the suction pipe of all pumps and install a shock absorber in the inlet and outlet pipes of end suction circulator pumps. The following diagrams will help you install your circular pump correctly:
Inline Circulator Pump Installation Diagram
End Suction Circulator Pump Installation Diagram
In order to examine and then buy the most suitable circulator pump, you must first determine the brand and required capacity.
For this reason, the DamaTajhiz HVAC website has gathered specialized collection and technical information on dozens of circulator pumps from reputed brands, along with their eligible guarantee for you to enjoy the good feeling of optimal and smart shopping.
When choosing the circulator pump needed for the project, check the following specs carefully:
Water circulator pumps usually have inline and end suction pumps (usually used in small or medium-sized buildings), 1450 round, and have less electrical power than similar water supply pumps. Inline pumps are installed on the pipe with gear or flange connection, and end suction pumps on a suitable and leveled chassis and bolts with rubber shock absorbers.
In order to choose and buy a circulator pump easily, you must first determine the brand and required capacity. On the site of DamaTajhiz HVAC Group, the technical information of dozens of models of circulator pumps from reputable brands with original warranties has been presented so that you, dear customers, can enjoy the good feeling of optimal and smart shopping.
Also note that in the specialized HVAC group of Damatajhiz, all the circulator pumps are only sold in bulk. Therefore, if you want to wholesale any of these products, feel free to contact us.
The price of circulator pumps varies according to the variety of models and brands available in the market.
You can browse all types of circulator pumps at the best price; it should also be noted that the prices presented in the DamaTajhiz are all up-to-date, with an elite discount already included in these prices. Therefore, the best price for all types of circular tanks is guaranteed for wholesale purchase.
Dear user:
While thanking you for the trust you have in the technical opinions of DamaTajhiz sales experts, it should be noted that the determination and selection of the desired product brand based on history, brand strength, service, and product price are ultimately determined by the buyer. But in circulator pumps, most of the users and buyers choose and buy best-selling brands such as DamaTajhiz and Semnan Energy according to their quality, price, and after-sales service.
If, after reading the above material, you have more questions about deciding to buy different types of pool pumps, diatomaceous and pool pumps, you can contact the pool equipment sales experts at extension numbers 103 – 105- 106. Get circulator pump advice and ask your questions.
Because the specialized group of DamaTajhiz HVAC Group provides all kinds of circulator pumps in the Middle East region, if you need a pool pump for any of the countries in the region, you can place your purchase order with confidence, product guarantee, and reasonable price. Please leave it to our sales experts.
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