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Air Cooled Glycol Scroll Chiller

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Low Temperature Glycol Chiller System

Low temperature glycol chiller system uses Panasonic /Danfoss or Bizter compressor to offering continuous coolant glycol water with a temperature from -35° to +5°C with cooling capability from 2KW to 200KW and temperature stability of ±0.5°℃ to ±2°C. This glycol chiller system specially designed for certain industrial applications that need a lower(below zero) chilled liquid.Tongwei strict quality control and strong ability of designing and manufacturing .We look forward to becoming your long-term low temperature glycol chiller system supplier in China.

Cooling Capacity: 2KW-200KW

Chilled Water Temperature:+5℃ ~-35℃

Refrigerant: Environmental Friendly R404a

Power Supply: 380V/50HZ /3PH (Standard)

208-480V/60HZ/3PH(Customized)

Compressor Brand: Panasonic /Danfoss /Bizter Compressor

Evaporator Type: SS Plate Type /Shell and Tube

Low temperature glycol chiller system is a glycol refrigeration system, is an industrial cooling chiller that uses a water and glycol mixture as a coolant which allows it to efficiently transfer heat and maintain temperature control in different kinds of industrial applications, particularly in applications that involve cooling liquids or equipment.

All low temperature glycol chiller system manufactured by Tongwei, supplying constant glycol water is the ideal cooling partner for dairy milk, cider mills, breweries, wineries, and spirits, food and beverages, pharmaceutical,yogurt machines, medical, laboratories, and some other applications that require accurate and precise low temperature control from -35℃ to 5 ℃.

1.Features of Tongwei‘s Low Temperature Glycol Chiller System

▪ Reliable design/well-known brand Panasonic/Danfoss Bitzer compressor

▪ Environmental friendly Refrigerant: R404A for low temperature

▪ Fully customizable tank and cooling capacity to meet your specifications. Talk with us about your application and requirements.

▪ Multiple compressor types

▪ Stainless steel plate type evaporator or shell and tube evaporator

▪ All low temperature glycol chiller system is equipped with the following safety protections
Overload Protection
High and Low Pressure Alarm
Water Level Indicator
Inverse Phase Alarm
Water Flow
Anti-Freeze Protection

2.What Are The Main Components of Low Temperature Glycol Chiller System?

2.1 Compressor

The compressor is the key mover in air cooled glycol Chiller Unit because it produces pressure variations to stir the refrigerant around.Tongwei use Panasonic/Danfoss/Bizter/Copeland brand compressor, using R404A refrigerant,this brand compress is with high refrigeration efficiency,low noise ,energy saving,environmental protection and durability,safety and stability.

Panasonic Compressor

2.2 Evaporator

The evaporator is a crucial component of low temperature glycol chiller system, as it is responsible for extracting heat from the liquid being cooled,it is located between the compressor and the expansion valve.

SS Plate Type+ Water Tank Evaporator

2.3 Water Pump
The water pump is designed to increase the pressure and the flow of the chilled water in a closed space.
the water pressure water pump for chiller is about 2 bar , but if you need more higher water pressure , pls tell us when you inquiry .For example ,when you use chillers for cooling bottle blowing machine ,the water pressure for water pump need about 4 bar .

Water Pump

High Pressure Water Pump

2.4 Condenser

The condenser for air cooled glycol chiller system is equipped with efficient cross-seam fins and female threaded copper tubes 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.

Aluminum fin+fan Condenser

2.5 Controller Panel
Tongwei chillers use precision digital temperature controller, it RS485 communication port，which can do remote monitoring and control. Simple operation, low failure rate, high safety factor, easy installation.

Controller Panel

3.What is the Difference Between Low Temperature Glycol Scroll Chiller System and Low Temperature Glycol Screw Chiller System?

Low Temperature Glycol Scroll Chiller Low Temperature Glycol Screw Chiller System

▪ 1hp-60HP Above 60HP

▪ Danfoss/Panasonic Scroll Compressor Hanbell/Bitzer Screw compressor

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

Glycol Scroll Chiller System Glycol Screw Chiller System

4.Why Glycol Is Used for Cooling?

The most commonly used coolant in a chiller is water or a mixture of water-glycol. Glycol-based coolants consist of either ethylene glycol or propylene glycol. The main advantage of glycol coolants is their anti-freeze properties. Pure water freezes at 0 degrees C, while 30% ethylene glycol freezes at -14 degrees C. The low freezing point of glycol mixtures makes them ideal for cooling items that are below the freezing point of water. Although glycol has a lower heat capacity than water (each kilogram of glycol is easier to heat than one kilogram of water), the high temperature difference allows the glycol mixture to dissipate heat more quickly than pure water. The glycol mixtures are more suitable for applications where the chiller must quickly dissipate a large number of heat. In addition to providing excellent heat transfer parameters, glycol tends to discourage algae growth in heat transfer equipment.

Comparison of Ethylene Glycol and Propylene Glycol

Property Ethylene Glycol Propylene Glycol

Freeze point depression More effective Less effective

Heat transfer efficiency/capacity Better Less

Viscosity Lower Higher

Flammability Low Low

Chemical Oxygen Demand Low Higher

Biodegrading Degradesin 10-30 days Needs more than 20-30 days to degrade

Carcinogenic No No

Toxic High level of acute when taken orally, Lower level of acute
targets the kidneys

Skin Irritant Low Low

Ethylene Gycol And Propylene Glycol

5.How Does A Glycol Chiller Work?

A glycol 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 glycol 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 glycol chiller:

Glycol Chiller Working Principle

6.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? Pls see below glycol ratio of glycol and water mixtures for the glycol chillerin your cooling process:

Glycol Water Water Temperature

16% 84% 0℃

24% 76% -5℃

32% 68% -10℃

40% 60% -15℃

45% 55% -20℃

50% 50% -25℃

55% 45% -30℃

7.What Applications Can A Low Temperature Glycol 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:

7.1.Breweries

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

Glycol Chiller for Breweries

7.2.Wineries

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

Glycol Chiller for Wineries

7.3 Cider Mills

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

Glycol Chiller for Cider Mills

7.4 Distilleries

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

Glycol Chiller for Distilleries

7.5 Food Industry.

Glycol 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.

Glycol Chiller for Food Industry

7.6 Dairy Product

A properly designed dairy glycol 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.

Glycol Chiller for Dairy Product

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

8.How to Choose Right Low Temperature Glycol Chiller System for your Application?

It is very important to select the right glycol Chiller for application process, if you want proper and durable cooling,please see blow key points:

8.1.Air-Cooled Glycol Chiller or Water-Cooled Glycol Chiller

There are two types of glycol chiller: one is air-cooled type, the other one is water-cooled type.

Air Cooled glycol scroll chillers use aluminum fin+fan as condensers that is similar to the “radiators” in a car.They use a fan to force air through the refrigerant coil. Unless they are specifically designed for high ambient conditions, air-cooled condensers need to operate effectively at an ambient temperature of 45℃ or less.

Water Cooled glycol scroll chiller use shell and tube as condensers.The heat enters the condenser water from the refrigerant vapor. The warm condenser water is then pumped to the water cooling tower, where the heat from the process is eventually vented to the atmosphere.

Air-cooled Glycol Chiller Installation for Reference

Water-cooled Glycol Chiller Installation for Reference

8.2.Cooling capacity

When you choose a suitable chiller model , you need to know the cooling capacity in KW/TON.How to calculate the cooling capacity you need? Please see the below formula:

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 5m³ water from 25°c to 15 °c in 1 hour?

Temperature Differential = 25℃-15℃=10℃

Water Flow Rate = 5 m³/hour

Cooling Capacity in KW = 5 x 10 ÷ 0.86 = 58,14 KW

Oversize the chiller = 58.14 x 1.2 = 69.76 KW

69.96kw cooling capacity for chiller is required.

8.3.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

8.4.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.

8.5.Evaporator Choose

Chillers generally have two types of evaporators: one is coil in water tank evaporator ,the other one is shell and tube evaporator.

Coil and tank evaporator, which has a built-in water storage tank for more convenient use,so there’s no need for extra buffer tanks. This is also our standard evaporator for chiller , if you don’t have buffer tank ,we just use this evaporator for your chiller.

Shell and tube type evaporator, which requires an additional water buffer tank to connect .The buffer tank’s capacity can be customized according to specific needs. It can buffer a larger heat load, and store more chilled water, but the installation will be more troublesome.

Water Tank Inside Chiller

10.Contact Us to Learn More About Our Low Temperature Glycol Chiller System

Don’t delay in making the best decision for your manufacturing business and your future by increasing your production capabilities with low temperature glycol chiller. Contact us today for more information on a chiller.
Our probessional team will help you with any questions you have on our chiller units. We look forward to hearing from you!

TW-AL series low temperature glycol chiller techinical parameters
Model Item		Temp.	TW-3AL	TW-5AL	TW-6AL	TW-8AL	TW-10AL	TW-12AL	TW-15AL	TW-20AL	TW-25AL	TW-30AL	TW-40AL
Cooling capacity	KW 50HZ/60HZ	-5℃	4.1 4.92	7.8 9.36	9.2 11.04	11.5 13.8	16.2 19.44	19.2 23.04	22.5 27	28.5 34.2	39.5 47.4	48.6 58.32	64.5 77.4
		-10℃	3.8 4.6	6.3 7.6	7.5 9	9.1 10.9	13.2 15.8	16.1 19.3	19.5 23.4	26.4 31.7	32.2 38.6	39 46.8	52 62.4

		-20℃	1.9 2.3	3.0 3.6	4 4.8	6 7.2	7.1 8.5	8 9.6	13.9 16.7	16.9 20.3	20.8 25	24.4 29.3	30.8 37

		-30℃	1.0 1.2	1.6 1.9	1.9 2.3	2.7 3.2	3.2 3.8	3.8 4.6	6.1 7.3	9.5 11.4	12.1 14.5	14.3 17.1	19 22.8

		-35℃	0.67 0.8	1.04 1.25	1.5 1.8	2.3 2.8	2.8 3.4	3 3.6	4.3 5.2	6.35 7.62	8.3 10	10.1 12.1	13.35 16

Evaporator	Chilled water(m3/h)	-5℃	1.2 1.44	2.2 2.64	2.6 3.12	3.3 3.96	4.6 5.52	5.5 6.6	6.4 7.68	8.5 10.2	11.3 13.56	13.9 16.68	18.4 22.08
		-10℃	0.65 0.79	1.1 1.3	1.3 1.5	1.6 1.9	2.3 2.7	2.8 3.3	3.4 4.1	4.5 5.4	5.6 6.7	6.7 8.1	9 10.8

		-20℃	0.33 0.4	0.52 0.62	0.69 0.83	1.1 1.3	1.23 1.47	1.38 1.65	2.39 2.87	2.85 3.45	3.57 4.3	4.2 5.04	5.3 6.36

		-30℃	0.17 0.21	0.28 0.33	0.33 0.4	0.47 0.55	0.55 0.65	0.65 0.8	1.1 1.3	1.6 2	2.1 2.5	2.46 2.9	3.3 3.9

		-35℃	0.12 0.14	0.18 0.22	0.26 0.31	0.4 0.48	0.48 0.58	0.52 0.62	0.72 0.89	1.1 1.31	1.43 1.72	1.74 2.09	2.3 2.76

	Type		shell and tube type/Plate type heat exchanger
	inlet/outlet pipe	lnch	1"	1"	1"	1"	1-1/2"	1-1/2"	2"	2"	2"	2-1/2"	2-1/2"
Input power		KW	3.18	4.86	5.61	7.25	9.4	10.9	13.5	18.8	22.55	28.5	37.5
Max Current		A	7.8	12	13.7	18	23	26.5	33	46	55	69	91
power source			3PH～380V/415V～50HZ/60HZ(3PH～200V/220V 50HZ/60HZ)
Refrigerant	Type		R22(R404A/R507)
	Control		External balance thermal expansion valve
Compressor	Type		Hermetic scroll ( piston )
	Power	KW	2.25	3.75	4.5	6	7.5	9	11.3	7.5*2	9.37*2	11.3*2	30
Condenser	Type		Efficient finned copper tube with aluminum + low noise external rotor fan
Water pump	Power	KW	0.75	0.75	0.75	0.75	1.1	1.1	1.5	2.2	2.2	4	5.5
	Max lift	m	20	20	20	20	20	20	20	20	20	25	20
Safety devices			Compressor inner protection, over current protection, high/low pressure protection, over temperature protection, flow rate protection, phase sequence/phase missing protection, low level coolant protection, anti freezing protection, exhaust overheat protection
Dimension	Length	mm	980	1150	1150	1350	1500	1500	1860	2020	2020	2200	2350
	Width	mm	520	560	560	680	760	760	850	950	950	1150	1350
	Height	mm	1170	1215	1215	1530	1660	1660	1900	2000	2000	1980	2000
Net weight		Kg	135	165	210	310	450	530	750	835	920	1080	1125
Notes: 1.Rated cooling capacity is based on: chilled water inlet and outlet water temperature 12 ℃ / 7 ℃, the cooling air inlet and outlet temperature 30 ℃ / 35 ℃ 2.Scope of work: chilled water temperature range: -30℃ to 35 ℃; chilled water inlet and outlet temperature difference: 3 ℃ to 8 ℃. The ambient temperature of condensation: Not higher than 35 ℃ (non-standard chiller ambient temperature of condensation can reach maximum 55 ℃, need to order production).

1.How does a chiller system work?

Chiller has two circulation,one is process water circulation,the other is refrigerant gas circulation.Heat picked up from the process.Heat transfers to refrigerant circulation.Heat is remove to air or water.

2.How to calculate right cooling capacity for chillers?

One of the most frequently ask about how we can know the cooling capacity for chillers. Let’s see the below formula.
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 5m³ water from 25°c to 15 °c in 1 hour?

Temperature Differential = 25℃-15℃=10℃
Water Flow Rate = 5 m³/hour

Cooling Capacity in KW = 5 x 10 ÷ 0.86 = 58,14 KW

Oversize the chiller = 58.14 x 1.2 = 69.76 KW

69.96kw cooling capacity for chiller is required.

3.Types of chiller system?
There are two types of chiller :Air Cooled Glycol Chiller and Water Cooled Glycol Chiller.

Water cooled chiller needs a separated water cooling tower and water cooling pump ,if you don‘t have exsiting water cooling tower,we suggest you use air cooled chiller; But if your ambiemt 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.

4.Whether chillers need built-in Tank ornot？

In a chiller system, a tank is usually equipped to buffer the thermal load of the chiller.

But should we choose a built-in type of tank or an external type of tank?

A chiller with a built-in tank is easier to install and can be used simply by connecting a water pipe to your application.

But it has a limited capacity and is not suitable for applications with larger chilled water demands.External tank’s capacity can be customized according to specific needs.

It can buffer a larger heat load, store more chilled water, but the installation will be more troublesome.

If you don‘t have external water tank ,we suggest our chiller built-with water tank ,which is easy for you to install.

5.Cooling capacity unit conversion?

1 KW=860 kcal/h ;

1 TON=3.517 KW;

1 KW=3412 Btu/h;

6.Can ethylene glycol be used for cooling? What are the advantages?

The main advantage of glycol coolants is their antifreeze properties. Glycol mixtures are perfect for cooling things because they have a lower freezing point than water. Thirty percent ethylene glycol freezes at 6.8°F (-14°C), while pure water freezes at 32°F (0°C).

7.How Often Should Ethylene Glycol Be Changed?

We recommend mixing distilled water and 100% USP propylene glycol at a ratio of 1 part ethylene glycol to 2 parts water. Inhibiting ethylene glycol is possible but not required. We recommend an annual glycol solution change as a maintenance routine for your glycol chiller.

Please submit your basic information, we will contact you as soon as possible!