All hot and all cold units

Huaxiang has launched the all-cooling and all-heating twin-screw compressor unit in the field of extraction, and now adopts the latest semi-hermetic twin-screw compressor, which has higher efficiency; optimized refrigeration cycle, more precise control, higher reliability; and abundant auxiliary functions such as heat pump, low temperature and heat recovery;

Over the years, the all-cooling and all-heating units have been widely used in airports, hospitals, hotels, chemical industry, pharmaceutical industry, reaction kettles, fermentation, large-scale factories, carbon dioxide extraction and so on.

Unit features

1. High-precision, high-stability twin-screw compressor, low vibration and low noise.

2. Adopting multi-compressors, modular combination design, independent operation of each circulating circuit, automatic equalization, so the unit has a longer life.

3. Motor and compressor rotor direct drive, to avoid indirect transmission of energy loss, improve compressor efficiency.

4. Higher than the field standard development principles of inspection standards, higher reliability.

5. Advanced microcomputer control system or programmable PLC system, more perfect logic and protection procedures, more accurate control to ensure the safe and stable operation of the unit.

6. Optimized heat exchanger system, high heat exchanger efficiency, less refrigerant charging, simple oil return, no oil pump (except full-liquid type).

Scope of work

High performance screw compressor

Huaxiang produced a semi-hermetic double screw compressor since, at present, the double screw refrigeration unit in the whole said extensive operation, fully realize the water-cooled screw unit higher efficiency, higher reliability, can provide customers with better products, better quality service.

Twin-screw compressor features

1. The rotor adopts the world's most advanced brand manufacturers, high processing precision, to achieve the best running clearance, friction resistance to a minimum, high volume rate under the oil film sealing, to ensure long-term high-efficiency operation, but also to reduce the vibration such as and noise;

2. The capacity regulating valve is automatically restored to the minimum negative part, reducing the starting current;

3. Double-layer shell design, reduce the group running noise to a greater extent;

4. Built-in motor, without coupling to prevent refrigerant leakage, while the use of cold coal cooling motor, so that the failure is reduced to a minimum, prolonging the life;

5. Built-in motor thermostat, further protect the motor and lubricating oil;

6. External exhaust check valve effectively prevents the rotor from being reversed by the backwash of high pressure airflow during shutdown;

7. Built-in suction filter to filter out large particles of impurities and protect the screw surface from damage;

8. Capacity control: 100% ~ 15% or 100% ~ 75% ~ 50% ~ 25% of the range of infinitely or segmentally adjustable (R22, R134A units);

9. The compressor is equipped with oil heater, oil sight glass: oil maintenance port, exhaust backstop valve, which is convenient for unit repair and maintenance;

10. Built-in centrifugal oil separator, high oil separation efficiency, no external oil separation, no need to replace; (except full liquid type)

11. Capacity control: infinitely adjustable within the range of 100%~25% (R134a group).

Evaporator

1. dry evaporator, refrigerant sealing into the amount of less, back to the oil performance is good, without external oil pump and oil filter, no wearing parts, low maintenance costs;

2. Asymmetric distribution of refrigerant inlet and outlet, effective use of refrigerant properties, improve heat transfer efficiency;

3. The design of refrigerant inlet mesh distributor realizes the most rationalization of refrigerant distribution in the heat transfer tube;

4. Each cycle of the multi-head unit is independently counted, with good standby.

Refrigerant circuit

Each compressor corresponds to an independent circuit system, and each circuit includes: exhaust check valve, safety valve, liquid pipe ball valve, filter, service valve, thermal or electronic expansion valve, pressure switch, pressure sensor, thermistor and other components.

In addition, R134a unit adopts Huaxiang's patented refrigerant management system.

Advanced throttling device

The throttling device adopts imported thermal or electronic expansion valve, its main features:

1. High adjustment precision, more obvious energy-saving effect;

2. Large adjustment range, more adaptable to wide capacity adjustment;

3. It can ensure the best degree of superheat, improve efficiency and protect the compressor.

Double cooling skeptic

1. perfect forced subcooling design, increase the cooling capacity and improve the refrigeration efficiency;

2. the use of high-efficiency finned tubes increases the heat transfer area and at the same time strengthens the perturbation of refrigerant on the surface of the tubes, which greatly improves the heat transfer efficiency;

3. independent design of each cycle of multi-head unit, good standby;

4. optimized anti-punching plate structure, further improve the distribution of refrigerant.

A wide range of products for a variety of applications

Main features:

1. Cooling 7℃, hot water outlet temperature range: 80℃.

2. The full heater is installed inside the unit without taking up extra space in the machine room.

3. Wide range of applications, mainly used in carbon dioxide extraction demand places.

Advanced PLC system

Touchable color control LCD screen

1.7 inch true color liquid touch screen, visualized operation, easy and intuitive.

2. The main operation interface provides a number of operation modes, which can realize precise control of the unit under any working condition through the interface keyboard.

3. The operation status is clear at a glance, operation display; chilled water inlet/outlet temperature, outside air temperature, suction pressure, exhaust pressure, suction temperature, exhaust temperature, suction/exhaust superheat, thermal expansion valve or electronic expansion valve opening, compressor cumulative time and so on.

4. Alarm display, and at the same time can record the most recent alarm, provide two kinds of operation interface in English and Chinese, suitable for domestic and international market demand.

5. Continuous capacity control

Utilizing microcomputer control system and continuous compressor technology to achieve continuous capacity control temperature regulation is smooth and part load regulation is more accurate.

6.Water temperature control

Inlet water temperature or outlet water temperature control can be selected, temperature control accuracy of the set value of 1.0 ℃ to meet the needs of different occasions.

7. Balanced operation of compressor

Multiple compressor units automatically balance the running time of each compressor.

8. Expansion function

Support the host and water home linkage, to ensure the safe operation of the unit.

Complete protection function

1. High pressure protection and low pressure protection

When the discharge pressure is higher than the set value, or the suction pressure is lower than the set value, this protection device operates to stop the compressor to protect the compressor and the unit.

2. Compressor motor thermostat protection

This thermostat is placed in the motor winding of the compressor, when the motor temperature is higher than normal, it will stop the compressor operation to protect the compressor.

3. Exhaust gas overheat protection

When the exhaust gas overheat is too high, the unit can automatically adjust the refrigerant flow to reduce the exhaust gas temperature to protect the compressor.

4. Oil Heater

The oil heater ensures good lubrication characteristics and prevents the lubricant from foaming during startup.

5. three-phase overcurrent protection 

When the current of the compressor is higher than its set value, the overcurrent relay will automatically disconnect the circuit and stop the compressor from running.

6. Inverse phase protection

This device senses the phase of the power supply and absolutely prevents the compressor from running in reverse due to the wrong phase of the power supply.

7. Compressor Frequent Start Control

The compressor restart time function controls the compressor starting and stopping frequency within a reasonable range to protect the compressor.

8. Anti-freezing protection of the unit

When the temperature of the evaporator is lower than the set value, this function will force the compressor to stop operation to prevent the crystallization of the refrigerant carrier in the unit.

9. Safety valve

When the condenser pressure is too high and all the rest of the protection devices are out of order, the safety valve opens to prevent damage to the unit.

10. fusible plugs - mainly in scroll units

When the condenser temperature is too high and all other protective devices have failed, the fusible link opens to prevent damage to the unit.

11. Differential pressure switch for chilled water flow (R134a full-liquid type only)

The chilled water adopts differential pressure type water flow switch, which is more accurate compared with the traditional type water flow switch, and will not cause freezing of the chilled water pipe or even damage due to short-term breakage of flow or reduction of flow rate.

12. Compressor oil level protection (R134 full liquid type)

The photoelectric sensing oil level switch is adopted to prevent the unit from running in the state of lack of oil or less oil, which effectively guarantees the reliable and safe operation of the unit.