Circulator Pump

The circulator pump is used to circulate water in cooling and heating systems in order 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 for wholesale purchase.

A Guide to select different types of circulator pumps

In general, a circulator pump circulates cold or hot water in the air conditioning or central heating systems of the building 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.

Basically, 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).

circulator pump

The Main Parameters to Select a Circulator Pump

When choosing the circulator pump needed for the project, check the following specs carefully:

  1. The amount of head and flow of water in circulation required by the system
  2. Linear or ground pump
  3. Circulator pump brand and model
  4. Pump motor power and speed
  5. Rib/flange connection
  6. The diameter of the inlet and outlet pipes of the circulator pump

Circulator Pump Flowrate (GPM) Estimation

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).

Heating System: 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).

Cooling System: Kcal / 1250 = BTU /5000 = GPM

Here are the 8 points to keep in mind when calculating the pressure of a circulator pump:

  1. One of the most important and decisive factors in the correct calculation of the required head or pressure of circulator pumps is to pay attention to the natural flow of water inside the vertical pipes.
  2. This means that the only function of circulator pumps, which are usually used in closed cooling and heating systems, is to compensate for the frictional pressure drop of the water flow in the pipes, fittings, valves, and coils. Therefore, the required pressure of these pumps is usually much less than the pressure of the water supply pump of the same project, and this effectively reduces the power of the circulator electro-pump motor.
  3. Suppose the reverse piping method is used in medium and large buildings. In that case, it is possible to achieve the minimum required power of the circulator pump, as well as the most suitable uniform distribution of water flow in the piping can be achieved.
  4. When calculating the pressure of the cooling tower pump, due to the open path of water and the presence of natural flow in the return path of the water to the condenser, the same method of calculating the pressure of the circulator pumps should be used.
  5. If circulator pumps with 2900 rpm are used in small and medium-sized buildings, the vibration of the pump and the strong flow of water in the pipes will interrupt the comfort of the residents.
  6. If the circulator pump does not provide the circulating water pressure, the cold or hot water will not be able to pass through the pipes and reach the radiator, fan coil, or other cooling and heating devices.
  7. Also, Suppose there is no volume or flow rate of the relevant pump. In that case, the volume of water will not reach the device, and the cooling and heating device will be able to provide cooling and heating with a capacity lower than its actual capacity. Therefore, when choosing the required circulator pump, you can contact the sales experts of DamaTajhiz HVAC Group for better results.
  8. Suppose the pressure of the circulator pump is over-calculated. In that case, there is a possibility of water overflow from the open expansion source of the heating/cooling system on the roof of the building.

circulator pump pressure estimation

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.

Circulator Pump Installation Location

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.

In order 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 linear pump.

circulator pump installation

Buying a Circulator Pump

Water circulator pumps usually have linear and ground types (usually used in small or medium-sized buildings), 1450 round, and have less electrical power than similar water supply pumps. Linear pumps are installed on the pipe with gear or flange connection, and ground 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.

 DamaTajhiz HVAC Group: The best prices and brands of construction equipment 

Executive recommendations for installing a circulator 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 ground circulator pumps. The following diagrams will help you install your circular pump correctly:

Linear Circulator Pump Installation Diagram

Linear Circulator Pump Installation Diagram

Ground Circulator Pump Installation Diagram

Ground 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.

circulator pump in engine room

The Price of the Circulator Pumps

The price of circulator pumps varies according to the variety of models and brands available in the market. On the Website of DamaTajhiz HVAC, 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.

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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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