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APPLICATION OF WATER CHILLER IN CONCRETE MIXER
14:02 - 25/10/2023
Chiller is a device used to cool water during the concrete mixing process. Applying chillers in concrete mixers helps adjust the temperature of the mixing water to ensure the mixing process is effective and the concrete quality meets requirements.
Specifically, chillers work by drawing heat from the mixing water and cooling it using a refrigeration system. Then, water is fed back into the mixer with the adjusted temperature.
However, the use of chillers in concrete mixers needs to be carefully evaluated to ensure feasibility and economic efficiency.

WHAT IS A CONCRETE MIXER?

A concrete mixer is a machine used in construction to mix a combination of sand, gravel, cement, water, and additives to create a concrete mixture that meets the required specifications and improves the quality and efficiency of mixing concrete.

There are two main types of concrete used in construction: mortar and concrete.

Mortar is a mixture of cement, sand, lime, and water, while concrete is a mixture of cement, sand, gravel, water, and various additives.

Depending on the project and the amount of concrete needed, the contractor will need to choose the appropriate type of concrete mixer or concrete mixing plant to ensure the quality and requirements of the project.

WHY IS IT NECESSARY TO COOL THE CONCRETE MIXER:

  1. Temperature control: During the concrete mixing process, the temperature of the mixing water can increase due to environmental factors or the mixing process itself. If the temperature is too high, the concrete can be degraded or lose its mechanical properties, reducing the quality and durability of the concrete.
  2. Mixing time control: The temperature of the mixing water also affects the mixing time. If the temperature is too high, the mixing time will be shortened due to faster chemical reactions. This can reduce the efficiency and quality of the mixing process.
  3. Viscosity control: The temperature of the mixing water also affects the viscosity of the concrete. If the temperature is too high, the viscosity will decrease, making the concrete prone to overflowing from the mixer and difficult to control during the mixing process.
  4. Ensuring concrete quality: Cooling the concrete mixer helps ensure the quality of the concrete. The appropriate temperature stimulates the chemical process and homogenizes the reaction, resulting in concrete with high strength and durability.
  5. Meeting technical requirements: In some cases, technical requirements specify a specific temperature for the mixing water. Cooling the concrete mixer helps meet these requirements and ensures that the concrete quality meets the standards.
  6. Expanded usability: Chillers can be used not only for concrete mixers but also for other mixing processes in the construction or industrial sector.
  7. Extended lifespan of the mixer: By reducing the temperature of the mixing water, the chiller helps reduce the thermal load on the mixer, thereby prolonging its lifespan and reducing wear and tear.
  8. Energy savings: Chillers utilize advanced cooling technology, resulting in energy savings compared to traditional cooling methods.
  9. Minimizing concrete deformation: When the mixing water is cooled, the temperature of the concrete decreases, helping to minimize deformation and shrinkage of the concrete after mixing.
  10. Increased concrete hardness: Cooling the mixing water can help increase the hardness and strength of the concrete after mixing.
  11. Ensuring safety: Chillers help reduce the temperature of the mixing water, reducing the risk of burns or accidents due to contact with excessively hot water. Therefore, cooling the concrete mixer is necessary to ensure the quality and durability of the concrete, control the mixing process, and meet technical requirements.

CALCULATION FORMULA FOR CHILLING WATER IN CHILLER FOR CONCRETE MIXING CAN BE PERFORMED AS FOLLOWS:

  1. Determine the amount of water to be chilled: Firstly, you need to determine the amount of water needed to chill for concrete mixing. Typically, the water-to-concrete ratio is about 0.4 to 0.6, meaning 40% to 60% of the weight of the concrete. For example, if you need to mix 1m3 of concrete, the amount of water to be chilled will be 0.4m3 to 0.6m3.

  2. Determine the desired water temperature: Next, you need to determine the desired temperature of the chilled water. This temperature is usually specified in the technical requirements or standards of the project. For example, if the requirement is for the mixing water to be at 10 degrees Celsius, you need to chill the water from its initial temperature to 10 degrees Celsius.

  3. Calculate the amount of heat to be removed: Next, you need to calculate the amount of heat that needs to be removed to achieve the desired temperature. The formula for calculating the amount of heat to be removed is:

Q = m * Cp * ΔT

Where: • Q is the amount of heat to be removed (kWh) • m is the amount of water to be chilled (m3) • Cp is the specific heat capacity of water (kWh/m3.°C) • ΔT is the temperature difference (°C), calculated as the difference between the desired temperature and the initial temperature.

  1. Calculate the required chiller capacity: After calculating the amount of heat to be removed, you need to calculate the required chiller capacity to chill the water. The chiller capacity is calculated using the formula:

P = Q / COP

Where: • P is the required chiller capacity (kW) • Q is the amount of heat to be removed (kWh) • COP is the coefficient of performance of the chiller (cooling efficiency ratio).

  1. Select the appropriate chiller: Finally, you need to select a chiller with a capacity that matches the calculated chiller capacity. The chiller can be selected based on its capacity, efficiency, and the technical requirements of the project.

Example: Suppose you need to mix 1m3 of concrete and require the mixing water to be at a temperature of 10 degrees Celsius. You want to calculate the amount of heat that needs to be removed and the necessary chiller capacity.

  1. Determine the amount of water to be cooled: With a water-to-cement ratio ranging from 0.4 to 0.6, the amount of water to be cooled will be between 0.4m3 and 0.6m3. In this case, let's assume you choose to cool 0.5m3 of water.

  2. Determine the temperature of the water to be cooled: The required temperature of the water to be cooled is 10 degrees Celsius.

  3. Calculate the amount of heat to be removed: Using the formula Q = m * Cp * ΔT, we have:

Q = 0.5m3 * 1kWh/m3.°C * (10°C - initial temperature)

Assuming the initial temperature of the water is 25 degrees Celsius, we have:

Q = 0.5m3 * 1kWh/m3.°C * (10°C - 25°C) Q = 0.5m3 * 1kWh/m3.°C * (-15°C) Q = -7.5 kWh

Note that the value of Q is negative, representing the amount of heat that needs to be removed from the water.

  1. Calculate the required chiller capacity: Using the formula P = Q / COP, we need to know the COP value of the chiller. Assuming a COP of 3, we have:

P = -7.5 kWh / 3 P = -2.5 kW

Note that the value of P is negative, representing the power consumption of the chiller.

  1. Choose an appropriate chiller: In this case, you would need to select a chiller with a minimum capacity of 2.5 kW to cool the concrete mixing water.

In practice, this calculation formula may involve various factors such as chiller efficiency, water-to-cement ratio, initial water temperature, and technical requirements of the project. For accurate results, it is advisable to consult with experts or equipment suppliers.

The Chiller DC Inverter line is the most popular at White Cool for several reasons.

Firstly, it saves over 60% of electricity consumption compared to the previous generation.

Secondly, it has outstanding cooling capabilities, surpassing its predecessors by more than 50%.

Additionally, the design is optimized to reduce noise levels, ensuring a quieter operation.

Moreover, it is environmentally friendly, with no dust accumulation.

The Chiller DC Inverter line is known for its optimal performance in all functions, and its DC Inverter frequency can reach an impressive 420Hz. White Cool's water chillers are trusted and preferred by partners and businesses, continuously innovating and developing for the present year and the years to come.

Join White Cool today and experience the future of advanced chillers. For more information and detailed advice on our products and maintenance packages, please contact us at 0989.228.227 & 0919.597.425.

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