Skip to main content

VALVES USED IN A CHILLER SYSTEM AND THE TYPICAL VALVE PACKAGE

 VALVES USED IN A CHILLER SYSTEM AND THE TYPICAL VALVE PACKAGE



1.Chilled Water Side Valves

⇒Isolation valve (manual/electric actuated).

⇒ Installed on CHW supply and return lines. 

⇒ Used to isolate chiller for maintenance.


2. Balancing Valve (Manual or Automatic) 

⇒ Ensures correct flow rate to/from chiller. 

⇒ Helps maintain Delta T and proper flow distribution. 

⇒ Located after evaporator outlet (return line).


3. Differential Pressure Bypass Valve (if 2-way valves in system) 

⇒ Prevents excess pressure build-up when terminals shut. 

⇒ Maintains flow through chiller.


4. Flow Switch 

⇒ Senses chilled water flow across evaporator. 

⇒ Safety interlock: trips chiller if flow is lost. 

⇒ Usually paddle type or electronic.


5. Air Vent Valve (Manual or Automatic) 

⇒ Removes air pockets. 

⇒ Placed at high points of piping and chiller headers.


6. Drain Valve 

⇒ For flushing, cleaning, and maintenance. 

⇒ Located at low points or chiller base.


Condenser Water Side Valves (Water-Cooled Chiller only)


1. Butterfly Isolation Valve 

⇒ On condenser water inlet/outlet lines. 

⇒ For maintenance shutoff.


2. Y-Strainer 

⇒ Removes debris before water enters condenser. 

⇒ Protects tubes from clogging.



3. Balancing Valve 

⇒ Regulates correct flow through condenser circuit. 

⇒ Maintains required heat rejection rate.


4. Make-Up Water Valve (Float or Solenoid) 

⇒ Used in cooling tower sump. 

⇒ Maintains water level automatically.


5. Blowdown Valve 

⇒ Discharges excess/concentrated water from cooling tower loop. 

⇒ Reduces scaling.


⚙ Expansion Device

1. Thermostatic Expansion Valve (TXV) or Electronic Expansion Valve (EXV) 

⇒ Controls refrigerant flow into the evaporator. 

⇒ Maintains superheat and efficient cooling. 

⇒ Located between condenser and evaporator.



Comments

Post a Comment

Popular posts from this blog

HVAC MEP Thumb Rules & Formulas (With Examples)

  HVAC MEP Thumb Rules & Formulas (With Examples) 1. Heat Load Calculation  Formula: Q = Area (sq.ft) x Heat Load Factor (BTU/hr per sq.ft) Example: 500 sq.ft office: Q = 500 x 30 = 15,000 BTU/hr TR = 1.25 2. CFM Calculation Formula: CFM = Sensible Heat (BTU/hr) / (1.08 x Delta T) Example: 12,000 BTU/hr, Delta T = 20°F CFM = 556 3. AHU/FCU Sizing Rule: 1 TR = 400 CFM 2 TR Airflow = 800 CFM 4. Duct Sizing Velocity Limits: Main: 1400-1800 FPM 800 CFM @ 1000 FPM 0.8 sq.ft 14"x10" 5. Chilled Water Flow Rate Formula: GPM = BTU/hr / (500 x Delta T) Example: 24,000 BTU/hr GPM = 4.8 6. Pipe Sizing 1" pipe: 8-12 GPM 2" pipe: 30-40 GPM 35 GPM Use 2" 7. Chiller Sizing Formula: TR = BTU/hr / 12,000 Example: 60,000 BTU/hr → 5 TR 8. Cooling Tower Sizing Rule: Heat Rejection = 1.25 x Load 10 TR → Tower = 12.5 TR 9. Pump Head Calculation Formula: Power (kW) = (Q x H x 9.81) / (Efficiency x 1000) Example: Q = 5 L/s, H = 20 m, Efficiency = 0.75 Power 1.31 kW 10. Fresh Air Re...
Post a Comment
Read more

Type of Heat Exchanger

 There are several types of heat exchangers used in HVAC systems, including: 1. Coil Type:     - Chilled water coils     - Hot water coils     - DX (direct expansion) coils     - Evaporator coils     - Condenser coils 2. Shell and Tube Type:     - U-tube heat exchangers     - Straight tube heat exchangers 3. Plate Type:     - Plate and frame heat exchangers     - Plate and shell heat exchangers 4. Finned Tube Type:     - Finned tube heat exchangers 5. Spiral Type:     - Spiral heat exchangers 6. Regenerative Type:     - Regenerative heat exchangers 7. Adiabatic Type:     - Adiabatic wheel heat exchangers 8. Run-Around Coil Type:     - Run-around coil heat exchangers These heat exchangers are used in various applications, including: - Air conditioning - Heating - Ventilation - Refrigeration - Heat recovery - Industrial processes Each type of hea...
2 comments
Read more