2.hydronic system

8/2/2019 2.Hydronic System

1/17

HYDRONIC SYSTEMJ.ILANGUMARAN


2/17

6"

10"5"

5"

10"5"5"

CONDENSER

10"

10"

5"5"

P.S.

P.S.

6"

5"5"

5"5"

10"

CONDENSER

CONDENSER

5"

5"10"

10"

5"

5"

CONDENSER WATER PUMPS

( ONE STAND BY )

HYDRONIC SYSTEM


3/17

HYDRONIC SYSTEM - BASIC COMPONENTS

LOAD HEATSOURCE HEAT

* CHILLERS

* HOT WATER

TERMINAL UNITS

*

EXPANSION

CHAMBER PUMPS

* SOURCE * LOAD * PUMP

* DISTRIBUTION SYSTEM ( PIPING NETWORK )

* EXPANSION CHAMBER

GENERATORS * F.C.U.

. . .

DISTRIBUTION SYSTEM


4/17

WATER IS USED TO CARRY HEAT FROM POINT OF

GENERATION SUCH AS COOLING / HEATING COIL TO APOINT WHERE IT CAN BE REJECTED SUCH AS

REFERIGERANT MACHINE & HOT WATER GENERATOR

COOLING & DEHUMIDIFICATION

COMPRESSOR

CHILLING MACHINE

COIL-CHW

AIR FLOW

WATER RETURN

45F CHILLED WATER SUPPLY

CONDENSOR

TO SPACE

55F CHILLED

WATER PIPE LINES

HEAT REJECTED TO

REFRIGERANT

ie. AT COOLER

* AHU'S

* FCU'S

TERMINAL UNITS

WATER & AIR

BETWEEN CHILLED

HEAT EXCHANGE


5/17

AIR FLOW

TO SPACE

HOT WATER SUPPLY

HEATING COIL

HOT WATER SUPPLY

HEATING - HOT WATER & COIL

HOT WATER RETURN PIPE

HOT WATERGENERATOR 100F

ELECTRIC HEATERS

HEAT REJECTED TO HEAT EXCHANGE

BETWEEN HOT

WATER & AIR

TERMINAL UNITS* AHU'S * FCU'S


6/17

CONDENSOR

COMPRESSOR

COOLING

TOWER

WATER RETURN

CHILLING MACHINE

AIR OUT

AIR IN CONDENSOR

WATER IS USED TO CONDENSE THE REFERIGERANT TOLIQUID. IT THUS TRANSPORTS THE HEAT OF

CONDENSATION TO COOLING TOWER FOR REJECTION

TO ATMOSPHERE

WATER PIPE LINES

HEAT OF REFRIGERANT

CONDENSATION REJECTED

TO COOLING TOWER

ie. ATMOSPHERE

HEAT TRANSFER

BETWEEN REFRIGERANT

AND WATER

WATER SUPPLY


7/17

WATER IS USED ASA CARRIER OF HEAT,

IT IS THE COOLANT

OR COOLINGMEDIUM.

IT TRANSPORTS THE

BLOCK A

MECHANICAL

PLANT ROOM

HIGH SIDE

LOW SIDE

CHILLED WATER

F.C.U.

RETURN

CHILLED WATER

SUPPLY

F.C.U.

F.C.U.

F.C.U.

F.C.U.

F.C.U.

F.C.U.

F.C.U.

F.C.U.

F.C.U.

DISTRIBUTION NETWORK

SOURCE -

GENERATION OF

COOLING/HEATING

SPACE HEAT TOCHILLING MACHINE.

WATER IS A

SECONDARYREFERIGERANT

BLOCK D

BLOCK B

BLOCK C

L

L

L

DISTRIBUTION NETWORK

AHU

AHU

AHU

F.C.U.

F.C.U.

F.C.U.

F.C.U.

F.C.U.

F.C.U.


8/17

CHILLER FLOW RATE

HEAT CARRYING CAPACITY OF PIPING

Q = MASS FLOW RATE x SP. HEAT x TEMP.

RANGEQ BTU/HR = GALLONS/MINUTE x 8.33

POUND/GALLON x 60 x 1 x T0 F

= GALLON/MINUTE x 500 x

T0

F T0 F = BTU/HR PER GPM, FLOW RATE

8 = 4000 3.0 GPM / TR.

10 = 5000

2.4 GPM / TR.15 = 7500

20 = 10,000


9/17

STATIC HS = STATIC HD

THERE IS NO UNBALANCED

STATIC HEAD.

EVEN WHEN PUMP IS NOT IN

OPERATION, THE ENTIRE

PIPING IS FILLED WITH

WATER

ATMOSPHERIC

PRESSURE

EXPANSION

TANK

CHILLED WATER

CLOSED RECIRCULATING TYPE

THE PRESSURE AT THEHIGHEST POINT =

SYSTEM PRESSURE + STATIC

HEIGHT & LIQUID

(EXPANSION TANK WATER

LEVEL )

COOLER

RETURN

WATER

44F

SUPPLY

PUMP

TERMINAL

UNITS

54F

CHILLED


10/17

AHU / FCU

AHU / FCU

AHU / FCU

B

C

D

G

F

E

10 FT

10 FT

10 FT

10 FT

10 FT

DIRECT RETURN

COOLERA H

40 FT

PUMP

PARALLEL PATHS- A-B-G-H ( 100 FT. ) SHORTEST PATH

- A-B-C-F-G-H (120 FT.)

- A-B-C-D-E-F-G-H ( 140 FT. ) LONGEST PATH


11/17

SEAMLESS IS EXPENSIVE & HENCE NOT USED

GENERALLY FOR HVAC SYSTEM

FOR CHILLED & CONDENSER WATER PIPING

ERW CLASS -C PIPES ARE USED

CLASS A IS NEVER USED

FOR DRAINS ERW CLASS B GI PIPE IS USED


12/17

CONTROL VALVES

CONTROL VALVES ARE USED ACROSS THE

COOLING / HEATING COILS FOR VARYING

WATER FLOW IN RESPONSE TO CHANGINGLOAD.

-

3 WAY MOTORISED - DIVERTING

2 WAY MOTORISED

3 WAY VALVES ARE USED FOR CONSTANTPUMPING SYSTEM, WHILE 2 WAY VALVES ARE

USED FOR VARIABLE PUMPING SYSTEM.


13/17

3 WAY MOTORISED MIXING VALVE

COIL

AB A

B

CHW / HOT

WATER INCHW / HOT

MOSTLY USED IN RETURN LINE OF COOLING /

HEATING COILS. THERE ARE TWO INLETS AND ONE

OUTLET. THE PORT DESIGN IS SUCH THAT IT

CANNOT BE USED IN PLACE OF DIVERTING VALVE.

FLOW VARIES THROUGH THE COIL. THE TOTAL

FLOW REMAINS REMAINS SAME.


14/17

3 WAY MOTORISED DIVERTING VALVE

COIL

AB A

B

CHW / HOT

WATER IN

THERE IS ONE INLET AND TWO OUTLETS. THE

PORT DESIGN IS SUCH THAT IT CAN BE USED IN

PLACE OF MIXING VALVE. DIVERTING VALVES

ARE EXPENSIVE AND ARE NOT COMMONLY

USED.

WATER OUTCHW / HOT


15/17

CHILLER4"4"

8" 4"4"

8"

4"

4"

EXPAN.TANK

4"

AHU4000 CFM 4000 CFMAHU 4000 CFMAHU

8"8"

"

8"8"

CHILLED WATER FLOW DIAGRAM

CHILLER

CHILLER

8"

4"

4"

4"4"8"

8"

4"

FLOW RATE / MACHINE = 1226 LPM

=WATER TEMPERATURE IN 53F ( 11.6 C )

=WATER TEMPERATURE OUT 45F ( 7.2C )

4"

( ONE STAND BY )

3 NOS. CHILLED WATER PUMP


16/17

6"

10"5"

5"

""5"

CONDENSER

10"

5"5"

P.S.

P.S.

6"

CONDENSER WATER FLOW DIAGRAM

5"5"

5"5"

10"

CONDENSER

CONDENSER

5"

5"10"

10"

5"

5"

CONDENSER WATER PUMPS

( ONE STAND BY )


17/17

END

2.hydronic system

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