Water Cooled Low Temperature Screw Chiller With Two Compressors

Water Cooled Low Temperature Screw Chiller With Two Compressors

A low-temperature chiller,also called a glycol chiller or glycol chiller system,which is a refrigeration-based cooling machine that is used to provide cooling and maintain the temperature for efficient working of process by using chilled glycol as a refrigerant. There are two types of low temperature : air-cooled low temperature chiller and water-cooled low temperature chiller,heat dissipation of the former is by fans , the latter dissipates heat is by cooling tower.A low temperature glycol chiller unit consists of refrigeration components and pipes containing a glycol-water mixture as the coolant. The chilled fluid from the refrigeration unit is transported through pipes associated with the heat exchanger surrounding the heating process. After absorbing heat from the associated process, the heated coolant is returned to the refrigeration unit to be cooled, and the process is repeated. Low temperature chiller system is cooling capacity from 1/2 HP to 60HP ,with Panasonic/Danfoss scroll compresso,above 30HP glycol chiller is with hanbell/Bizter screw compressor using environmental friendly R404a refrigerant,shell and tube evaporator /condenser,PLC controller,expansion valves .

As a leading low temperature chiller system manufacturer and supplier in China,not only do we provide high-quality chiller machines, but we prioritize excellent customer service. A major advantage of our Tongwei, is that our customers are our top priority, which sets us apart from our competitors. Our knowledgeable team is dedicated to providing excellent customer service and your satisfaction.Some of the key benefits our team provides for your chiller include:Thoroughly unpack, clean and test each chiller system before shipping; Conduct routine quality assurance checks on every unit; Only ship brand new machines and systems to our customers;Troubleshoot and resolve problems as promptly and efficiently as possible. If you are sourcing for high quality and optimal temperature-maintaining low temperature Chiller manufacturer in China,please feel free to contact us to customized your glycol cooling water systems with high quality and reasonable price for the low temperature chillers. We look forward to working with you.

Water Cooled Low Temperature Screw Chiller With Two Compressors Technical Specification  

Features And Advantages of Water-Cooled Low Temperature Screw Chiller

 ▪ Siemens PLC temperature controller for overall monitoring of chiller running status;  .

 ▪ water temperature range from -30℃ to 5 ℃

 ▪ High quality shell and tube condenser and heat exchanger

 ▪ Screw compressor with environmental friendly R404a refrigerant and four grade capacity control 25%-50%-75%-100%;

 ▪ It need connect with water cooling tower and water cooling pump

 ▪Chiller equipped with the following safety protections:Overload Protection,Inverse Phase Alarm,High/Low Pressure Alarm,Water Flow,Water Level Indicator,Anti-Freeze Protection

What Are The Main Components Of Water Cooled Low Temperature Screw Chiller With Two Compressors?

3.1 Compressor

The compressor is the key mover in Water Cooled Low Temperature Screw Glycol Chiller because it produces pressure variations to stir the refrigerant around.

For Water-Cooled Low Temperature Screw Chiller with two compressors , which is with Hanbell Screw brand or Bizter Screw compressor for optional depends on the required refrigeration capacity, using R404A refrigerant,this brand compress is with high refrigeration efficiency,low noise ,energy saving,environmental protection and durability,safety and stability.

Each screw compressor with 4 steps of energy control 25%-50%-75%-100% to make sure the whole screw chiller is stable and guarantee high refrigeration performance.

Hanbell Screw Compressor

Bizter Screw Compressor

3.2 Evaporator

The evaporator is a crucial component of water cooled low temperature chiller, as it is responsible for extracting heat from the liquid being cooled,it is located between the compressor and the expansion valve. Water Cooled Screw Chiller Uses highly efficient closed loop shell and tube type heat exchanger as the evaporator.

Shell and Tube Evaporator

3.3 Condenser

The condenser for water cooled low temperature chiller is water-cooed type shell and tube for high heat exchange efficiency and good stability.Its function is to cool down the refrigerant steam released from the compressor into a liquid or gas-liquid mixture.

Water-cooled type Shell and Tube Condenser

3.4 Controller Panel

Tongwei chillers use Integrated PLC control system with human-computer interface and big LED touch screen panel.

Spare Part for Water-cooled Low Temperature Screw Chiller

What is the Difference Between Low Temperature Scroll Chiller and Low Temperature Screw Chiller?

There are two types of low temperature chiller: one is air-cooled low temperature chiller ,the other is water-cooled low temperature chiller ;

Air-cooled low temperature chillers use ambient air to dissipate heat from the processes. They are energy-efficient, space-saving, and less maintenance that helps save money.

Water-cooled low temperature chillers use water from an external water cooling tower to dissipate heat from the processes. These systems are longer lifespan, Relatively quiet, and more consistent cooling performance than the air-cooled low temperature chiller.

Low Temperature Scroll Chiller                             Low Temperature Screw Chiller

▪ 1hp-60HP                                                            Above 30HP

▪ Danfoss/Panasonic Scroll Compressor                        Hanbell/Bitzer Screw compressor

▪Built with water tank and water pump                         Without water tank and water pump

Air Cooled Low Temp. Scroll Chiller                   

Air Cooled Low Temp. Screw Chiller

Water Cooled Low Temp.l Scroll Chiller             

Water Cooled Low Temp. Screw Chiller

Why Need Add Glycol Into The Low Temperature Chiller?

We know that once the temperature drops to 0°C or even lower, water will freeze. Glycol helps water prevent freezing and turn into ice. This is why we call it is glycol chiller.

Using a glycol-water mixture as a chiller coolant has various benefits over using clean water as a chiller coolant. These advantages are due to its unique physical properties, including a lower freezing point than water.

Generally speaking, a glycol chiller consists of refrigeration components and pipes containing a glycol-water mixture as the coolant. The chilled fluid from the refrigeration unit is transported through pipes associated with the heat exchanger surrounding the heating process. After absorbing heat from the associated process, the heated coolant is returned to the refrigeration unit to be cooled, and the process is repeated.

For many types of chillers, glycol is mixed with water in a 60/40 ratio. A high proportion of ethylene glycol significantly improves the antifreeze performance of the mixture. This is useful in situations where rapid cooling is required. In these cases, the process can be cooled to very low temperatures without freezing the coolant inside the pipes.

The working principle of traditional chillers is to transfer heat between two media: fluid and solid. These cooling systems work by absorbing heat or vapor compression. The basic components of a chiller system include the refrigeration unit and the piping system that circulates the refrigerated coolant.

Comparison of Ethylene Glycol and Propylene GlycolProperty  

Ethylene Gycol And Propylene Glycol

How Does A Water-cooled Low Temperature Screw Chiller Work?

A low temperature chiller is composed of a refrigeration component and tubing containing a water-glycol mixture as coolant. Chilled fluid from the refrigeration unit is channeled through the piping associated with a thermal exchanger surrounding a heated process. After absorbing heat from the associated process, the hot coolant is returned to the refrigeration unit for cooling after which the process is repeated.

A low temperature chiller consists of a compressor, an evaporator, a condenser, a throttling element, and an electric control system. Let’s see what’s the working principle of a low temperature  chiller:

The compressor of a low temperature chiller

Tongwei low temperature chiller uses top screw-type compressor features energy efficiency, low noise, and long service time.

In order to ensure that the pressure inside the evaporator is low enough and that the refrigerant is at such a low temperature, the compressor is used to pump out the evaporated refrigerant and compress the low temperature and pressure into the high temperature and pressure refrigerant gas.

Condenser for a low temperature chiller

Low temperature chillers are designed and manufactured by Tongwei and feature a choice of air-cooled or water-cooled condensers.

The high-temperature and high-pressure refrigerant condenses into liquid in the condenser. The refrigerant in the condenser releases heat in the air or water that is cooler than it.

Thermal expansion valve in a low temperature chiller

Thermal expansion valve plays an important role in low temperature chiller. The refrigerant of the  glycol chiller is reduced from the condensation pressure to the evaporation pressure, so the liquid from the condenser can be put into the liquid tank.At this time, the refrigerant is at normal temperature and high pressure, and then passes through the expansion valve to lower the boiling point, and the liquid enters the evaporator to absorb heat and evaporate.

The evaporator in a low temperature chiller

The evaporator for industrial water cooled screw low temperature chiller just is: shell and tube type heat exchanger.

The low-temperature and low-pressure refrigerant liquid passes through the thermal expansion valve and exchanges with the evaporator.

Once the heat is absorbed, it becomes saturated or superheated steam that can be returned to the compressor for refrigeration.

The Ratio of Water to Glycol to Use

It is important to use the proper ratio of glycol to water mixture in the cooling system depends on the coldest temperature you need during operation, as insufficient glycol can cause the system to freeze, possibly bursting pipes and even destroying the chiller evaporator even may damage the glycol chiller, while too much glycol to a chiller system will result in an inefficient system.

But what’s the best ratio for glycol and water mixtures? Please see below glycol ratio of glycol and water mixtures for the glycol chiller in your cooling process:

What Applications Can Water-cooled Low Temperature Screw Chiller System Be Used For?

Glycol chiller is a specific kind of cooling system,which is used to cool a variety of liquids and other industrial applications.

By using a glycol chiller can achieve the low temperature for your industrial usage you need .

Glycol chillers are most used for below these Industries:

9.1 Breweries

In breweries, the glycol chiller is used for cooling the wort,Controlling Fermentation,Crash Cooling Vessels,Prepackaging and Product Storage.

Low Temperature Chiller for Breweries

9.2 Wineries

Low Temperature chillers are widely used in the fermentation process, cold stabilization and room cooling purposes.

Low Temperature Chiller for Wineries

9.3 Cider Mills

Fermentation control needs critical water temperature control. Low temperature chiller can provide cold chilling of the juice and milk, also the cold storage of the final product.

 Low Temperature Chiller for Cider Mills

9.4 Distilleries

During the fermentation process, the low temperature chiller will provide a steady coolant for circulation between distillation tanks & stills for heat removal purposes.

Low Temperature Chiller for Distilleries

9.5 Food Industry.

Low temperature chillers can provide low-temperature coolant to guarantee the safety and consistent quality of frozen foods, food processing companies need a low-temperature cooling day in and day out.

Low Temperature Chiller for Food Industry

9.6 Dairy Product

A properly designed dairy low temperature chiller can cool the milk very rapidly to help keep milk temperatures (and bacteria growth) under control as it is transferred from the milking parlor to its insulated tank.

Low Temperature Chiller for Dairy Product

Do you need a low temperature chiller for an application not mentioned here? Contact us and we’ll customize an affordable solution for your exact demands.

How I Can Choose The Right Low Temperature Chiller System For Your Application?

There are FIVE important chiller specifications you need consider when you choose a chiller for your application :the cooling capacity for chiller ,the voltage required for operation, the associated pump horsepower and flow rate (contact us for custom selection), refrigerant, and the evaporator type.

10.1Calculate Right Cooling Capacity For Chiller

One of the most frequently ask about how we can know the cooling capacity for chillers.  We use KW ,Ton, But/h,Kcal/h to choose chiller cooling capacity :1 KW=860 kcal/h ;  1 TON=3.517 KW;1 KW=3412 Btu/h;

There is also a formula to calculate the cooling capacity for chiller:.

Cooling Capacity(kw)= Flow Rate(m3/h)*Temp Change(T1-T2)/0.86

Heat Load= C(specific heat)* M(quality output per hour )*Temp Change(T1-T2)

Oversize the chiller by 20% Ideal Size in KW = KW x 1.2

Noted : T1:Incoming Water Temperature (℃)      T2:Required Chilled Water Temperature(℃)    

For example, what size of chiller is required to cool 10m³ water from 35°c to 15 °c in 1 hour?

Temperature Differential = 35℃-15℃=20℃

Water Flow Rate = 10 m³/hour

Cooling Capacity in KW = 10 x 20 ÷ 0.86 = 232 KW

Oversize the chiller = 232 x 1.2 = 278.4KW

278.4 kw cooling capacity for chiller is required.

10.2 Types of low temperature chiller you need?

There are two types of chiller :Air Cooled Low Temperature Chiller and Water Cooled Low Temperature Chiller.

Water cooled chiller needs a separated water cooling tower and water cooling pump ,if you don‘t have existing water cooling tower,we suggest you use air cooled chiller; But if your ambient temperature is very high above 55℃ ,we suggest you use water cooled chiller , as it is easier to dissipate heat for water cooled chiller with water cooling tower.

But Most customers use air cooled low temperature chiller ,which is more easily install and save space.

10.3 Power

Different countries and regions have different standards for industrial electricity, the common power supplies are 208-230V, 380-420V,440-480V,50Hz or 60Hz, 3phase.

Such in Philippines ,the power supply is 220V 60HZ 3PH , 380V 60HZ 3PH ,460V 60HZ 3PH;

in Singapore and Malaysia ,the power supply is 415V 50HZ 3PH;

in Mexico ,the power supply is 220V 60HZ 3PH;

In USA ,the power supply is 208V 60HZ 3PH;575V 60HZ 3PH;480V 60HZ 3PH and so on

10.4 Water Pump

When you decide the capacity/tonnage of the chiller, we will recommend you the suitable pump in KW,which standard water pump is about 2 bar .If you need more high water pressure , please us when you inquiry.

10.5 Refrigerant

R22, R410A, R407C, R404A, R134A are optional choices.

R22: good cooling effect, but R22 is considered a powerful greenhouse gas, so it’s forbidden in most countries.

R410A: eco-friendly, R-410A has replaced R-22 as the preferred refrigerant for use in residential and commercial air conditioners in Japan, Europe, and the United States. R-410A operates at higher pressures than other refrigerants.

R407C: a good replacement for R22, good cooling effect.

R404A: suitable for application that requires low temperature(below -10°c).

R134A: a non-flammable gas used primarily as a “high-temperature” refrigerant, suitable for air-cooled chiller working at a high ambient temperature above 50℃.

Shipping Way of Water-cooled Low Temperature Screw Chiller

As a professional low temperature low temperature chiller supplier &exporter,we have our own shipment forwarder to arrange the shipment .Our chiller machine is with plywood packing,which prevent damage during transportation and meet export standards.There are three ways can delivery your chiller unit :

1. Ship by Air: As the chiller is with compressor ,water pump and fans ,the compressed refrigerant and oil inside the compressor is a dangerous item with the possibility of explosion , so it needs to release the compressed refrigerant before transportation. (It means that water chiller without refrigerant when choosing this shipping way. After the machine arrives at your destination, you need to add refrigerant by local professionals. The airline company also request us to provide many documents to prove that the chiller not a dangerous product. The freight cost by air is very high may be higher than the cost of chiller , So By air for delivery is not the mode of transport recommended to our customer.

2. Ship by Sea: The transportation time is longer than by air , but the freight cost is cheap ,and there is no need to add refrigerant after the equipment arrives at the destination.This shipping way is the most suitable mode of transportation for you to delivery your local port.

3.If you have your own shipment container in your other supplier in China, we can help you delivery the chiller machine to your supplier in any city of China .

Why should you choose Tongwei for your water-cooled low temperature screw chiller supplier?

▪ Experience you can trust

We have been designing and building water chiller for over 15 years. From air cooled chiller to water cooled chillers and everything in between, we have built chillers for nearly every industry and every application.

▪ Fast Quote

Get a quote for your project today! We typically provide a custom quote within 2 hours.

▪ 24/7 customer service

Believe that we will always be by your side. Whether you have a question or need a quote, there‘s always someone answering the phone 24 hours a day.

▪ Durable and reliable machine

Our products are manufactured from high quality materials and we offer a competitive warranty on all  industrial chillers.