Circuit Schematic of Water-Cooled Portable Water Chiller to 3 Tons
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- Compressor (1)
- The Compressor has two functions in the refrigerant cycle.
- First, it removes the refrigerant vapor from the evaporator and reduces the pressure in the evaporator to a point where the desired evaporating temperature can be maintained.
- Second, the compressor raises the pressure of the refrigerant vapor to a level high enough so that the temperature is higher than the temperature of the cooling medium available for condensing in the refrigerant vapor.
- Water-Cooled Condenser (2)
- The condenser is a heat exchanger where the process heat absorbed by the refrigerant is given off to the air around it.
- As heat is given off by the high temperature high pressure vapor, its temperature falls until the vapor condenses to a liquid.
- Water-cooled condenser use a plant water supply source, typically a tower system.
- Refrigerant Pressure Limit Switch (3)
- Protects the system against excessive pressure in the refrigerant circuit.
- For the most typical operations, the high pressure limit is factory set at 325# and the low pressure switch is set to open at 58# and close at 63#.
- Alteration of this limit switch is not advisable unless Factory directed.
- High Refrigerant Pressure Gauge (4)
- Provides visual indication of the refrigerant condensing pressure.
- Water Regulator Valve (5)
- Automatically adjusts the condenser water flow by the condenser head pressure to establish nominal condenser refrigerant pressure.
- Filter Drier (6)
- The filter drier prevents or removes moisture, dirt, and other foreign materials from the refrigerant that will harm the system components and reduce efficiency.
- Liquid Line Solenoid Optional (7)
- The liquid line solenoid is an electrically controlled refrigerant flow control valve that closes when the compressor stops.
- This prevents liquid refrigerant from migrating to the evaporator and causing liquid slugging
when the compressor starts again.
- Liquid slugging can cause severe damage to the compressor. The valve is opened when the compressor is on.
- Refrigerant Sight Glass (8)
- The refrigerant sight glass allows the operator or serviceman to observe the flow of liquid refrigerant.
- Adequate refrigerant is determined by a clear liquid flow.
- Bubbles indicate a shortage of refrigerant.
- The moisture indicator turns colors depending on the moisture content in the system. Green signals no moisture content, yellow signals that the system is contaminated with moisture and requires service.
- Expansion Valve (9)
- The expansion valve meters the flow of liquid refrigerant into the evaporator at the proper rate to provide cooling of the process water.
- As more cooling is required, additional refrigerant is metered through the valve into the evaporator.
- Hot Gas Bypass Valve (10)
- The hot gas bypass valve prevents short cycling of the compressor by modulating the compressor capacity.
- When activated, the valve opens and allows hot refrigerant gas to enter the refrigerant stream entering the evaporator.
- This reduces the effective capacity of the system.
- Evaporator (11)
- The evaporator is the device in which liquid refrigerant boils off, absorbing heat as it evaporates, cooling the process fluid.
- Reservoir (12)
- The coolant reservoir provides adequate volume to support the flow requirements of the chiller.
- The reservoir is non-pressurized promoting air separation and high process flows.
- Coolant Pump (13)
- The coolant pump circulates chilled fluid through the process loop.
- To Process Sensor Probe (14)
- The to process sensor probe is placed in the coolant flow stream going to the process.
- Control decisions are made based on the TO PROCESS coolant temperature.
- Coolant Pressure Gauge (15)
- Provides visual indication of the coolant pressure supplied to the process.
- Water make Up Solenoid Valve Optional (16)
- When activated by the float switch, the WATER MAKE UP SOLENOID will open and introduce supply water to the reservoir.
- This restores the reservoir to the proper operating level.
- From Process Sensor Probe (17)
- The from process sensor probe is placed in the coolant flow stream coming back from the process.
- Reservoir Level float Switch Optional (18)
- The reservoir float level switch is place at the proper water level in the reservoir.
- If the water level falls below the proper level, the float switch activates the Water Make-Up Solenoid valve refilling the tank to the proper level.
- Low Refrigerant Pressure Gauge (19)
- Provides visual indication of the refrigerant evaporating pressure.
For more information about water-cooled portable water chillers call the Advantage Sales Department at 317-887-0729.
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