跳至主要内容

Determining Pump Head: A Guide to Optimal Water Pump Performance - Hstarschiller.com

 

1.Components of Chilled Water Pump Head:


Evaporator water resistance of the refrigeration unit: typically 5-7m water column (refer to product samples).
Water resistance of end devices (air handling units, fan coils): usually 5-7m water column (refer to product samples).
Resistance of components such as return water filters, two-way control valves: generally 3-5m water column.
Water resistance of headers and manifolds: typically 3m water column.
Friction and local resistance losses along the refrigeration system piping: typically 7-10m water column.
In summary, the pump head for chilled water is in the range of 26-35m water column, usually around 32-36m water column. Note: Pump head calculation depends on specific refrigeration system conditions; avoid blindly applying empirical values.
Chilled water pump head components

2.Components of Cooling Water Pump Head:


Condenser water resistance of the refrigeration unit: generally 5-7m water column (refer to product samples).
Water pressure at cooling tower spray nozzles: typically 2-3m water column.
Height difference from the water pan to nozzles in an open cooling tower: usually 2-3m water column.
Resistance of components such as return water filters, two-way control valves: generally 3-5m water column.
Friction and local resistance losses along the refrigeration system piping: typically 5-8m water column.
In summary, the pump head for cooling water is in the range of 17-26m water column, usually around 21-25m water column.
Cooling water pump head analysis

3.Make-up Water Pump Head:

The head includes the distance from the fixed pressure point to the highest point, resistance at the pump's suction and discharge ends, and a surplus head of 3-5m water column.
Make-up water pump head calculation

Example:

For a 100m tall building with water-cooled screw units, estimate the required head for the chilled water pump in a closed air conditioning water system.

Answer:

Evaporator resistance: 60kPa (6m water column).
Piping resistance: 185kPa (18.5m water column).
End device resistance: 45kPa (4.5m water column).
Valve and filter resistance: 40kPa (4.0m water column).
Total system resistance: 330kPa (33m water column).
Pump head: Taking a 15% safety factor, H = 33m * 1.15 = 37.95m.
Based on the estimation, one can grasp the pressure loss range for water systems in similar-sized buildings.
H.Stars Chilled water pump

评论

此博客中的热门博文

Where are water-cooled chillers used? What is a chiller used for?

  Water-cooled chiller   is a cooling water device that can provide constant temperature, constant current and constant pressure. A chiller is a machine that achieves refrigeration through vapor compression or absorption cycles. These liquids can flow through heat exchangers to cool the air or equipment. The industrial chiller can always output ice water with a lower temperature than the ambient temperature. It can be used wherever cooling is required, either direct cooling or indirect heat exchange. The main components of a water-cooled chiller are compressor, condenser, evaporator, water pump, and water tank. Chillers have a wide range of applications. The chiller can be used to cool the injection mold, improve the quality of plastic products, cool the vacuum coating, control the temperature of the vacuum coating machine, cool the food industry, fast cooling processing, chemical industry, effectively control the temperature of chemicals, cooling buildings, concrete fast Cool...

Ways and solutions of noise produced by chillers - www.oumalchiller.com

  It is inevitable that the chiller will produce sound when it is working. For example, when the fan rotates, the fan blades rub against the air, it will produce sound. Normal sound is allowed. However, even the sophisticated refrigeration equipment will appear after a long period of use. Fault. Then, the editor of   Oumal Chiller   will take you to understand the causes and solutions of the noise produced by the chiller. First, find the reason from the parts that are easy to check and observe: 1. Are the anchor screws loose? The chiller is fixed on the ground. After running for a long time, the anchor bolts will be loose, and the chiller will be unstable, which will cause noise. This situation can be solved by replacing the anchor bolts, and vibration reduction can also be installed if conditions permit. The purpose is to make the chiller firmly fixed on the ground. 2. Whether the connecting pipeline is firm There are large and small pipes on the chiller, connecting the ...

How is the Refrigeration Industry Leading the Green Development with R404A

  As global environmental concerns continue to rise, the refrigeration industry is undergoing a significant transformation. Water-cooled low-temperature units exported overseas are now increasingly adopting the eco-friendly refrigerant R404A, leading the way in the industry's green development. Here's a deeper look into this trend. Why Is R404A Becoming the Preferred Refrigerant for  Water-Cooled Low-Temperature Units ? R404A is a blend of refrigerants that stands out due to its environmentally friendly properties. It is free from Ozone Depleting Potential (ODP) and has a relatively low Global Warming Potential (GWP), making it an ideal substitute for traditional refrigerants. This balance between high-performance cooling and environmental friendliness has made R404A especially popular in regions with strict environmental regulations, such as Europe and North America. Water-cooled low-temperature units exported to these areas are now commonly equipped with R404A to meet local ...