Water cooled chillers. Water cooled chillers


WSC/WSR chillers are designed for indoor installation, are assembled in a compact housing and have high energy efficiency. A wide range of models allows you to accurately select a model based on performance and reduce capital costs. The chillers are equipped with a microprocessor control system, regulation and optimization of operating parameters. Chillers are ready for operation after being connected to the power supply and connected to the coolant circuits, which significantly reduces the time for installation and commissioning.
Chiller models:
- WSC - basic model;
- WSC/H - with built-in hydraulic module;
- WSR - cooling/heating;
- WSR/H - cooling/heating, with built-in hydraulic module.

FRAME
WSC and WSR chillers are supplied in a weather-resistant casing made of galvanized steel with a powder enamel coating. The body consists of a supporting frame and removable panels. The body is painted in RAL 7035.

REFRIGERATION CIRCUIT
R407C is used as refrigerant.

The refrigeration circuit includes the following components:
- sight glass;
- filter drier;
- thermostatic valve (TRV) with external equalization;
- refrigeration cycle reversal valve (only for models with heat pump mode);
- solenoid valve (only for models with heat pump mode);
- liquid receiver (only for models with heat pump mode);
- Schrader valves for maintenance;
- emergency valve in the refrigeration circuit

COMPRESSORS
The units are equipped with scroll compressors (models 09-40), equipped with a crankcase heater and overload protection built into the electric motor windings. The compressors are installed in a separate compartment outside the air flow.

CAPACITOR
The condenser is a direct-cooling plate heat exchanger made of AISI 316 stainless steel. The use of condensers of this type ensures a significant reduction in the mass of the refrigerant charged into the system and the overall dimensions of the unit.

EVAPORATOR
The evaporator is a direct-cooling plate heat exchanger made of AISI 316 stainless steel. The use of evaporators of this type ensures a significant reduction in the mass of refrigerant charged into the system and the overall dimensions of the unit.
The evaporator is thermally insulated with elastic material and can be equipped with an electric heater for frost protection (optional). The evaporator freeze protection heater is an electrical heating cable that runs along the evaporator and is designed to protect the evaporator water path from freezing. The heater is controlled by a microprocessor controller. Each evaporator is equipped with an anti-freeze temperature sensor.

MICROPROCESSOR CONTROL SYSTEM
The control system performs the following functions: water temperature regulation, frost protection, compressor operation control, high and low pressure control in the refrigeration circuit, control of the operation of electrical circuit breakers.
The control system has an input for remotely turning on/off the chiller and a relay output for an emergency signal. The WSR chiller control system has an additional input for switching winter/summer modes.
The chiller controller can be connected to the BMS system using Lonworks, Modbus and BACNet protocols (optional). The remote control panel provides control of the unit parameters from a distance (optional).

SAFETY SYSTEM
The safety system includes an additional temperature sensor to protect against water freezing, a high pressure sensor in the refrigeration circuit, a low pressure sensor in the refrigeration circuit, an emergency pressure relief valve in the water circuit, a flow sensor in the water circuit, thermal protection of compressors, a relay for monitoring the presence and correct sequence of supply voltage phases.

LOW-NOISE MODELS
In these models, the compressors are soundproofed.

HEAT RECYCLING
To increase energy efficiency, the chiller (models 13-40) can be equipped with a partial heat recovery system. The heat is used to heat water, for example in a domestic hot water system.

HYDROMODULE
Chillers can be supplied with an integrated hydraulic module, which includes the following components. The water storage tank is thermally insulated at the factory with elastic material and can be equipped with an electric heater for frost protection (optional). The antifreeze kit for chillers with a hydronic module includes an electrical heating cable routed through the evaporator and water circuit pipes, as well as an electric heater installed inside the water circuit storage tank. The set is controlled by a microprocessor controller.
A centrifugal type water pump is designed to circulate water in a hydraulic circuit. The pump is controlled using a microprocessor controller.
The hydraulic circuit may include (as accessories) an expansion tank, a safety valve, and manual taps with associated fittings.

Refrigerators, or chillers, are classified by how heat is removed from the condenser. In most models, this process occurs using outside air. But in some conditions it is more practical to do this with water.

A water-cooled chiller differs from an air-cooled device. Its design uses a shell-and-tube condenser, which is cooled by cold water supplied to it.

When purchasing equipment, it is important to pay attention to a number of important aspects:

    Cooling power. This value depends on many indicators and is calculated depending on the operating conditions: type of coolant (pure water or a mixture with glycol is used), coolant temperature at the inlet/outlet of the chiller (if a high indicator is provided, it means more power), condensation temperature. The power of the device depends on the conditions in which it operates. When purchasing, you must immediately provide information about the conditions for using the chiller. The optimal temperature at the coolant inlet/outlet is 12/7C. The outside temperature should be +35C.

    Thermostatic valve (TRV). One of the important elements of the refrigeration circuit is the thermostatic valve. To obtain reliable and durable operation, it is worth purchasing a chiller with an electronic expansion valve. Mechanical is cheaper, but may require greater costs in the future.

    Case material. Experts advise paying special attention to this. The most practical option is a galvanized body. Often the material needs to be discussed separately at the time of purchase.

    Compressor. Chillers use different types of compressors. The most popular are spiral, screw, centrifugal. Scroll and screw compressors are considered a reliable and practical option. They are durable and do not require high costs for additional maintenance. Centrifugal compressors are used in chillers with very large cooling capacities.

    Heat exchanger type. The buyer is often faced with the choice of pipe materials used in a shell-and-tube heat exchanger. Pipes made of titanium, cupronickel or stainless steel are used when using aggressive cooling media (for example, sea water), as well as in the food industry.

    Guarantee. Do not neglect such an important detail as the warranty for equipment repairs. All other things being equal, you should give preference to the option with a longer warranty period.

    Additional purchase details. It is worth asking the seller what type of freon is used in the chiller. If necessary, additional parts such as mesh filters to protect the condenser and water filters are also purchased. A remote installation display can be purchased to make it easier to monitor the chiller remotely.

Operating principle of water-cooled chillers

The water chiller includes a condenser, compressor, evaporator and thermal expansion valve. Liquid freon is supplied to the evaporator, where it boils, after which it evaporates and at the same time takes heat from the coolant. From the evaporator, the refrigerant in a gaseous state enters the compressor, where it is compressed and heated. Then it enters the condenser, where it condenses, i.e. it becomes liquid, and the heat generated is removed with the help of water. After this, liquid freon passes through the thermal expansion valve and again ends up in the evaporator, the process is repeated.

Benefits of use

  • Compactness. Air cooled chillers take up a lot of space due to the required condenser blowing area. The heat exchanger in a water chiller is smaller, and therefore its design is more compact.
  • Advantages of the location. The water condenser chiller does not require outdoor installation to operate. The device is often installed indoors. By placing it in a basement or technical room, you can save a lot of space.

Scope of application

You can install a chiller with a water condenser almost anywhere. In an office space, the use of such equipment will help save space and not spoil the facade of the building, since it can be installed directly inside the room.

It is also convenient to use water cooling in production. If it is possible to install the chiller near a water source, this will help save money on laying and replacing pipes.

Buy a water-cooled chiller from Yantai Moon Group ("Moon Group") in Moscow

A water chiller is a profitable and practical way to create the correct microclimate in any room. Our company is the official representative of the Moon Tech group of companies in the region, which manufactures heat control equipment.

Our website offers a large selection of water-cooled chillers.

The company's extensive experience and rich customer base have allowed the company to establish itself as a conscientious manufacturer selling quality products. The prices for our equipment compare favorably with most, thanks to direct deliveries from the manufacturer.

To find out the exact cost of equipment, get advice or place an order, just leave a request using the feedback form or by calling the phone number listed on the website.

The General Climate company offers to buy chillers with water-cooled condenser at a competitive price in Moscow or another city in the Russian Federation. In a device of this type, heat is removed through water. The main difference between water-cooled chillers and their air-cooled counterparts is the design of the condenser. As a rule, heat exchangers of the plate, shell-and-tube or plate-fin type are installed in them.

A water-cooled condenser chiller has the following advantages:

  • compactness due to the smaller volume of the heat exchanger operating on water;
  • Possibility of installation inside the building, as it does not require much space and outside air.

AREAS OF APPLICATION

Such chillers are successfully used on cargo ships transporting perishable products to maintain low temperatures in the holds and ensure stable operation of engines and certain parts of technical and electronic equipment. By drawing water directly from the sea into the circuit, the chiller becomes especially economical and energy efficient.

In the food industry, chillers of this type are used very widely to cool liquids on a large scale. At manufacturing enterprises they are used for cooling machine tools, vacuum installations, thermoplastic machines, etc.

In air conditioning systems for facilities requiring zoned temperature distribution, liquid-cooled chillers are used for heat recovery.

Despite all the obvious advantages of water-cooled chillers, their full functioning requires a constant water flow. It can be flow-through or circulating (connected to cooling towers or dry coolers). However, the water must be clean. Due to a simpler design solution, they are much cheaper compared to their air counterparts, but require the use of additional devices - external coolers.

Water-cooled chillers are devices that perform their assigned task using water circulating in the system. They are a good alternative to units that use air for the same purpose. Moreover, in some cases they become the only possible way to remove heat from the condenser.

Such installations are used for indoor installation, often as an element of the central air conditioning system in buildings. As a rule, they are installed in separate rooms - basements, pumping stations, ventilation chambers, utility rooms, etc.

Refrigeration circuit structure

Chillers with a water-cooled condenser are not an independent element, but always part of a complex system that requires the presence of cooling modules, pumps, pipelines, fan coils that serve the end user of the generated resource.

The chiller itself consists of several elements:

  • refrigeration circuit (compressor, expansion device, condenser and evaporator water heat exchangers, filter drier);
  • automation;
  • protective devices.

During operation, the device processes the coolant, which is then transmitted through pipelines to fan coil units and other heat exchange units. The condenser circuit, oriented towards water cooling, communicates with a dry cooler mounted outside the building, or with a remote cooling tower, where, in fact, the cooling process of the working substance takes place. A special substance, usually a non-freezing liquid, circulates inside the circuit, the movement of which is ensured by a set of circulation pumps. An important advantage of this method of heat removal is the ability to use external coolants - running water taken from a nearby reservoir, etc.

Types of refrigeration machines

The specifics of using water cooling modules and their purpose determine the type of chiller:

  • the nature of the compressor used (devices are classified as scroll, screw, oil-free);
  • equipment power (low-productivity - up to 150 kW, medium-productivity - up to 400 kW, high-performance - over 400 kW);
  • class of heat exchangers (plate, shell-and-tube, flooded);
  • number of refrigerant circulation circuits (1, 2, 3, 4 circuits);
  • nature of the refrigerant (R-410a, R-22, R-134a, R-407C).

Each type of equipment is suitable for specific operating conditions.

Main advantages of using water cooling

In most cases, refrigeration equipment offered to consumers today are ergonomic designs that are characterized by extreme energy efficiency. Among the advantages of these designs, it should be emphasized:

  • compactness (water chillers do not require a significant area for blowing the condenser, unlike their air-cooled counterparts. Therefore, the working area of ​​the equipment, as well as the dimensions of the refrigeration module itself, are much smaller);
  • the ability to expand the existing system by replacing or adding equipment with greater power;
  • year-round operation (cold is generated throughout all seasons, the coolant is cooled without a refrigeration cycle);
  • installation of equipment inside or outside buildings;
  • the system is powered from any source of clean water (pipeline, nearby river, etc.).

The General Climate company offers a wide range of monoblock chillers; our specialists are ready to assist in selecting the optimal equipment.

Please check with our managers for current prices for water-cooled chillers.

Chillers are a functional and powerful refrigeration machine, which is necessary for high-quality cooling of the coolant in the form of a liquid substance. The device is actively used in industrial air conditioning systems, as it is economical.

Main features of water chillers

Refrigeration devices have several classifications. The main criterion when dividing into types of chillers is the method of heat removal from the condenser. In many cases, outside air is used for this purpose. But in some situations it is advisable to use a liquid substance - water.

The main distinguishing feature of water-cooled chillers from an air-cooled device is the design of the capacitors. The water unit does not have a tubular-finned heat exchanger, but a plastic, shell-tube or plastic-finned heat exchanger.

Plastic type condensers have many advantages over shell-and-tube devices; they have a smaller volume, which allows the use of less refrigerant.

You can purchase a water-cooled chiller by leaving a request on the website frienergy.ru.

Advantages and disadvantages of water chillers

Water-cooled units have some advantages over air-cooled chillers:

  1. Compactness. Air devices are large in size, since to ensure the required heat removal, an impressive blowing area is needed. As a result of this feature, about half the volume of the refrigeration machine is occupied by the condenser.

Water has excellent thermodynamic properties. The liquid has higher heat capacity and density compared to air. This provides the opportunity to reduce the size of the heat exchanger and therefore the chiller itself.

  1. The presence of the ability to install devices indoors. Water chillers do not necessarily require placement in the open air, since they do not require outside air to function. Therefore, devices are often installed indoors.

This advantage is very important in situations where the required large outdoor area for installing an air chiller is not available. Compact water chillers are often installed in technical rooms, basement areas and pumping stations.

The main disadvantage of water-cooled devices is the need for water to operate. Different liquids can be used to operate the chiller. To avoid clogging of the heat exchanger, it is necessary to install a special filter.

How to make the right choice
  1. Measuring water consumption for equipment.
  2. An indicator of the temperature that enters the equipment.
  3. The final temperature that is formed after passing through the equipment.

The chiller, like any refrigeration machine, has a condenser in its refrigeration circuit so that the gaseous refrigerant after the compressor turns into a liquid state to be supplied for subsequent throttling.

Depending on the design and manufacturer, the chiller is equipped with condensers of different cooling principles.

  1. Air cooling
  2. Water cooling

Most often, chiller buyers choose a design with an air-cooled condenser, since there are at least two reasons for such a choice: a simpler design and a lower cost of such a chiller.

However, there are some factors that may influence the choice of a water-cooled chiller.

    The calculated maximum condensing temperature when designing a standard chiller is 50C. If the condenser is air-cooled, then this corresponds to an air temperature of 35C. If the chiller is located on the sunny side, where it is exposed to direct sunlight during the day, then the temperature “35C” is the sum of the following calculation: at least 10C from solar radiation and 25C directly from the air temperature. At air temperatures above 25C, the air condenser may not completely condense the refrigerant. In this case, choosing a chiller with a water-cooled condenser is the only correct one. Such chillers operate stably at air temperatures up to +45C, in the case of using an open cooling tower or a closed cooling tower with irrigation, and the sun's rays do not affect its location in any way. It is also possible to use a dry cooler, but this significantly reduces the permissible ambient temperature and increases the electrical power consumption.

    In many cases, chillers are used for heating in winter. If a chiller with an air-cooled condenser is used, it can be installed in a warm room, the hydraulic circuit can be filled with water, but the heat exchanger will have to be blown with air using centrifugal fans. The air itself must be supplied and discharged through air ducts. Such design solutions make the equipment more complex and lead to a significant increase in cost. Centrifugal fans also create a lot of noise, which makes it difficult to find a place to install the chiller.

When installing a chiller with an air condenser outdoors and operating it in the heating mode in winter, the design is significantly simplified, because you just need to fill the hydraulic circuit with antifreeze liquid.

When installing a chiller with an air condenser outdoors and operating it in the cooling mode in winter, in addition to filling the hydraulic circuit with antifreeze liquid, it is necessary to use an additional expensive fan speed controller to maintain the condensation pressure, and starting after a long stop will be difficult, especially when low ambient temperatures. This complicates its design and leads to a decrease in chiller performance.

All such negative factors are eliminated by using a chiller with a water condenser, which can be located in any warm room. In this case, to operate in winter, you only need to fill the hydraulic circuit of the condenser and install a simpler option - a three-way valve with a drive to more accurately maintain the condensation pressure. This greatly simplifies the operation of the chiller.

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