heat recovery presentation rev 130213

5/26/2018 Heat Recovery Presentation Rev 130213

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B A S E D O N H O T W A T E R C O N S U M P T I O N

How to Save Energy

For a Hospital and Hotel


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Major Energy Consumption

Chilled Water Supplies for A/C System

CHILLER

Hot Water Supplies (Bathing, Hand Washing)

Temp. 55 5 oC Heat Pump

Boiler

Electric Heater Heat Recovery Chiller


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Hot Water Consumption

Hotel & Hospital (Temp. 55 5 oC)

Peak Consumption Period in 1 Day : 4 hour

Maximum Flow Rate : 90 L/hour

Average Flow Rate in each room per hour

Four Star Hotel : 25 L/hour

Five Star Hotel : 35 L/hour

Hospital : 30 L/hour


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Hot Water Flow RateDesign Calculation

Lets calculate Five Star Hotel per 100 rooms

Average Hot Water Rate Consumption per hour in each room35 L/ hour.

Total Hot Water Flow Rate Consumption for 100 rooms:

35 L/hour.room X 100 Room = 3.5 m3/hour


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Energy Consumption Calculation

Assume

Hot water temperature increasing from 30 55 oC(Temperature Difference 25 oC)

The specific mass of water is constant 1 kg/L

Energy Consumption per 1 hour for HeatingWater with temperature difference 25 oC:

Q = 3.5 m3/hr X 1000 kg/m3X 1 kcal/kg.oC X 25 oC X 1 hr

Q = 87,500 kcal = 101.76 kWH


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If We Use Heat Pump to Generate Hot Water

Average COP : 4.0

The Electric Energy per Hour for Heat Pump is:

101.76 kWH / 4.0 = 25.44 kWH

2012 Indonesian Electric Tariff for B-3/TM Class

Rp. 1,000/kWH (Block LWBP)

Therefore, the electric tariff we must pay to generate Hot Waterper 1 hour is:

25.44 kWH X Rp. 1,000 / kWH = Rp. 25,440.-


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If We Use Boiler to Generate Hot Water

Average Efficiency 65%

The Boiler Input Energy from the Diesel Fuel is:101.76 kWH / 0.65 = 156.55 kWH

Energy Specific for the Diesel Fuel:

9000 kcal/L or equal 10.467 kWH/L

So, the diesel fuel flow rate per hour is:156.55 kWH / 10.467 kWH/L = 15 L

Industry Diesel Fuel Price is Rp. 9,000 / Litre

Therefore the cost we must pay to generate the hot water per 1 hour for 100room is :

15 Litre X Rp. 9,000/Litre = Rp. 135,000.-


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If We Use Electric Heater to Generate Hot Water

If we assume that the electric heater efficiency 100 %

The Electric Energy per Hour for Electric Heater is:

101.76 kWH / 1 = 101.76 kWH

2012 Indonesian Electric Tariff for B-3/TM Class

Rp. 1,000/kWH (Block LWBP)

Therefore, the electric tariff we must pay to generate Hot Waterper 1 hour is:

101.76 kWH X Rp. 1,000 / kWH = Rp. 101,760.-


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If We Use Heat Recovery Chiller to Generate Hot Water

Average Five Star Hotel Chiller Capacity (Including FunctionRoom, Lobby, Restaurant, Office, Etc) :

3 RT / Room

So, for calculation per 100 room:

The Chiller Capacity100 Rooms X 3 RT/room = 300 RT

HITACHI Heat Recovery Chiller Heat Reclaim Capacity: Air Cooled: 19 % against Chiller Capacity Water Cooled: 15 % against Chiller Capacity


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Based on calculation above, the Heat requirement for generatehot water per 100 rooms is:

101.76 kWH

If we use Air Cooled Chiller with Heat Recovery, we will getthe heat energy with amount 19 % X 300 RT = 57 RT orequal 200.46 kWH

If we use Water Cooled Chiller with Heat Recovery, we will getthe heat energy with amount 15 % X 300 RT = 45 RT or

equal 158.26 kWH

The Heat Requirement above can be fully supplied by ChillerHeat Recovery System.


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Lets see the Hot Water Flow Rate requirement.

For 100 room, the hot water flow rate requirement is:3.5 m3/hour

Hitachi R-407C Heat Recovery Chiller Cap. 300RT canproduce Hot Water with 25 oC temperature increment withthe nominal Flow Rate:

Air Cooled : 7.2 m3/hour

Water Cooled : 5.5 m3

/hour

That means HITACHI HEAT RECOVERY CHILLER cansupply all of Hot Water Requirement.


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In HITACHI HEAT RECOVERY System, Hot Wateris a BONUS product which generated from thechiller system heat rejection.

That Means: The Electricity Energy for generate Hot Water inHitachi Heat Recovery System is FREE


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Payable Energy Cost Comparisonfor Generate Hot Water per Hour per 100 Rooms


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Payable Energy Cost Comparisonfor Generate Hot Water per Day per 100 Rooms

(Assume 15 Hours per Day)


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Payable Energy Cost Comparisonfor Generate Hot Water per Month per 100 Rooms

(Assume 30 Days per Month)


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Payable Energy Cost Comparisonfor Generate Hot Water per Year per 100 Rooms


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Conclusion

Using

Hitachi Heat Recovery Chiller

we can get Adequate Hot Water Supply

with

FREE Payable Hot Water-Energy Cost .


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Technical Information of Hitachi Heat Reclaim Water ChillersHAPG 2006.3

1 ApplicationThis information is applicable to all water-cooled and air-cooled Heat reclaim Chiller.

2 PrincipleAn additional heat-exchanger is mounted in each refrigerating cycle of heat reclaim chiller.

It is located in the discharge gas piping line. It means" sensible heat" area.

Refrigerating Cycle Diagram Moliere Chart

*High pressure level is as same as basic unit by using "sensible heat" heat exchanger even

though taking out hot water.

Most important point is "Pressure level is not so high'" & "can get high temp. water".

*Please make sure it is necessary the cooling demand to get hot water, and this chiller control

is depend on the cooling demand. This is "heat reclaim".

3 How to Use 3.1 : Control system of chiller is exactly same as basic unit. There is no relation between

additional HEX. and chiller. For instance, the interlock of the pump for water cooled chiller

shall be connected to the pump of condenser.

3.2 : Control system of additional HEX. shall be arranged independently.

It is strongly recommended that a storage tank with insulator shall be placed to keep the

hot water temp. level. The demand of hot water is not stable compared with that of

air-conditioning.

3.3 : The material of hot water devices in chiller is made of stainless steel and cupper to

avoid rust. But please make sure hot water is not drinkable.

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Water-cooled : condnser water

Air-cooled : Air

Hot Water

Condenser

Additional Hex.

Expansion Valve

Comp.

Cooler

Chilling Water

Cooling Capacity

Heat Rejection

by Condenser

Heat reclaim by

Additional Hex.


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T e c h n i c a l I n f o r m a t i o n o f H i t ac h i H e a t R e c l a i m W a t e r C h i l l e r s

*Water supply shall be done by the water

level of the storage tank.

*Reheat shall be done by the water temp.

of the strage tank.

Example of Hot Water System Example of the electrical diagram

4 T e c h n i c a l D a t a 4 1 : H e a t in g c a p a c i ty o f h o t w a t e r

Capacity is indicated based on the condition showed below.

Chilled Water Inlet/Outlet 12/7Hot Water Inlet/Outlet 30/55

Water-cooled Condensing Water Inlet/Outlet (30)/35

Air-cooled Outdoor Air Inlet Temperature 35

*Heating capacity is designed 15% of condenser heat rejection at the standard condition. *In case of different condition, it is necessary to correct the heating capacity.

4 2 : C o r re c t i o n F a c t o rCalculation Formula

A p p r o x im a t e H e a t in g C a p a c i t y =H e a t R e j e c t i o n C a p a c i ty o f B a s ic M o d e l a t th e D e s i g n C o n d i ti o n0 . 1 5 C o r r e c t i o n f a c t o r 1 C o r r e c t i o n f a c t o r 2

4 4 1 : H e a t R e je c t io n C a pa c i t y 4 4 3 : C o r r e c t io n F a c to r 2 * Water-cooled It is necessary to correct the condensing

Data is showed on the capacity table in TC1 temperature as "HCAP".

* Air-cooled * In case of Water-cooled chiller

Data is showed on the capacity table in TC1 Outlet Temp. of Correction

as "CCAP"+"IPT". Condensing water Factor 2

30 0.92

4 2 2 : C o r r e c t io n Fa c t o r 1 35 1.00 It is necessary to correct the outlet temperature 37 1.04

of hot water. * In case of Air-cooled chiller

Outlet Temp. of Correction Inlet Temp. of CorrectionHot Water( factor 1 Outdoor Air Factor2

45 1.18 25 0.88

50 1.09 30 0.92

55 1.00 35 1.00

60 0.86 40 1.12

Water-cooled : condnser water

Air-cooled : Air

Hot Water

Condenser

Additional Hex.

Expansion Valve

Comp.

Cooler

Chilling Water

Float SW to Demand

Pump2

Thermostat

Valve2 Storage Tank

Valve1

Water Supply

to Condenser Pump1

Additional Hex.

Comp.

Piping for

reheat

X1 X2 Float SW Thermostat

Pump1 X1 Valve1 X2 Valve2


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Water Control

CAUTION

When industrial water is applied for chilled water or condenser water, industrial water rarely causes deposits of scales or other foreign

substances on equipment. However, well water or river water may in most cases contain susp ended solid matter, organic matter, and scales

in great quantities. Therefore, such water should be subjected to filtration or softening treatment with chemicals before application as

chilled water or condenser water. Sand or mud contained in chilled water can settle down in the water cooler and restrict the flow of water,

causing a freezing accident. It is also necessary to analyze the equality of water by checking PH ,electrical conductivity, ammonia ion

content sulphur content, and others, and to utili ze industrial water only if problem is encountered through these checks. The following is t he

HITACHI standard water quality based on the JRA standard water quality.

Table 1

Condenser water system

Circulating SystemAcyclic Type

one-off

Chilled Water System TendencyItem

Circulating

WaterSupply Water Acyclic

Water

Circulating Water

Less than 20

Supply Water corrosio

n

Deposi

ts ofscales

Standard QualitypH (25)

6.5 ~ 8.2 6.8 ~ 8.0 6.8 ~ 8.0 6.8 ~ 8.0 6.8 ~ 8.0 Electrical conductivity (mS/m)(25) Less than 80 Less than 30 Less than 40 Less than 40 Less than 30

Chlorine ( mgCl/ l ) Less than 200 Less than 50 Less than 50 Less than 50 Less than 50

Sulfur acid ion ( mgSO42/ l ) Less than 200 Less than 50 Less than 50 Less than 50 Less than 50

The amount of acid consumption

(pH4.8)( mgCaCO3/ l )Less than 100 Less than 50 Less than 50 Less than 50 Less than 50

Total Hardness ( mgCaCO3/ l ) Less than 200 Less than 70 Less than 70 Less than 70 Less than 70

Calcium Hardness ( mgCO3/ l ) Less than 150 Less than 50 Less than 50 Less than 50 Less than50

Silica L ( mgSiO2/ l ) Less than 50 Less than 30 Less than 30 Less than 30 Less than 30

Reference Quantity

Total Iron (mgFe/ l )

Less than 1.0 Less than 0.3 Less than 1.0 Less than 1.0 Less than 0.3

Total copper (mgCu/ l ) Less than 0.3 Less than 0.1 Less than 1.0 Less than 1.0 Less than 0.1

sulphur ion( mgS2/ l ) It shall not be detected

Ammonium ion ( mgNH4+/ l ) Less than 1.0 Less than 0.1 Less than 1.0 Less than 1.0 Less than 0.1

Remaining chlorine ( mgCl/ l ) Less than 0.3 Less than 0.3 Less than 0.3 Less than 0.3 Less than 0.3

Floating carbonic acid ( mgCO2/ l ) Less than 4.0 Less than 4.0 Less than 4.0 Less than 4.0 Less than 4.0

Index of stability 6.0 ~ 7.0 - - - -

Note:

Mark in the table means the factor concerned with the tendency of corrosion or deposits of scales.

INSTALLATION


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Contoh Diagram Heat Recovery System Air Cooled Chiller


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PROJECT LIST CHILLER HEAT RECOVERY

1. HOTEL IBIS SEMARANG ( RCU-180 AYCZ-HR) X 2 UNIT ( 2007)

2. HOTEL MERCURE PONTIANAK (RCU-180 AHYZ-HR) X 2 UNIT (2008)

3. HOTEL PADMA BALI (RCU-260 WHYZ-HR) X 2 UNIT (2007 DAN 2010)4. HOTEL PADMA BANDUNG ( RCU-100 AHYZ-HR) X 2 UNIT ( 2008)

5. HOTEL ASTON PRIMERA BANDUNG ( RCU-180 AHYZ-HR) X 4 UNIT (2008)

6. PABRIK KAPSULINDO CITEUREUP ( RCU-75 ACZ-HR) X 1 UNIT (2005)

7. RS. DR SOETOMO SURABAYA ( RCU-400 AYCZ-HR) X 1 UNIT ( 2006)

8. PABRIK AQUA PASURUAN (RCUG-100 AHYZ-HR) X 1 UNIT ( 2008)

9. HOTEL TRAVELLERS BALIKPAPAN (RCU-300 WHYZ-HR) X 2 UNIT ( 2008)

10. RS. DR SOETOMO SURABAYA (RCU-400 AHYZ-HR) X 1 UNIT ( 2008)

11. PABRIK AQUA PANDAAN (RCUG-100 AHYZ HR) X 1 UNIT (2008)

12. LJ MERITUS HOTEL SURABAYA (RCU-450 WHYZ-HR) X 3 UNIT (2009)

13. HOTEL ISTANA TULUNGAGUNG (RCU-120 WHYZ-HR) X 2 UNIT ( 2009)

14. PABRIK AQUA KLATEN (RCUG-150 AHYZ-HR) X 1 UNIT ( 2009)15. HOTEL KARTIKA CHANDRA (RCUG-450 WHYZ-HR) X 1 UNIT ( 2010)

16. HOTEL NOVOTEL BANGKA ( RCU-260WHYZ-HR ) X 2 UNIT (2010)

17. HOTEL GALESONG MAKASSAR (RCU-180 WHYZ-HR) (2010)

18. HOTEL BALI HYATT SANUR ( RCUA-300 WHYZ-HR) X 2 UNIT ( 2010)

CONTINUE.......


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PROJECT LIST CHILLER HEAT RECOVERY

1. HOTEL ASTON MAKASSAR (RCU-180 WHYZ-HR) x 2 UNIT (2011)

2. HOTEL TRAVELLER SENTANI PAPUA (RCU-180 WHYZ-HR) X 2 UNIT (2011)

3. HOTEL LUXE JAKARTA ( RCUG-150 AHYZ-HR) X 2 UNIT ( 2012)4. HOTEL ASTON CIREBON (RCU-220 WHYZ-HR) X 3 UNIT ( 2012)

5. HOTEL ASTON MAGELANG ( RCU-180 AHYZ-HR) X 2 UNIT ( 2012)

6. HOTEL ASTON MALANG ( RCUG-180 AHYZ-HR ) X 3 UNIT ( 2013)

7. HOTEL IBIS SENEN ( RCU-120 AHYZ-HR) X 2 UNIT ( 2013)

8. HOTEL IBIS BANDARA SOEKARNO HATTA ( RCU-200 AHYZ-HR) X 2 UNIT ( 2013)


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PHE FOR HEAT RECLAIM


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HOT WATER TEMP OUTLET


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HITACHI CHILLER @ PADMA BANDUNG


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HITACHI CHILLER @ PADMA BALI


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HITACHI CHILLER @ MERCURE PONTIANAK


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HITACHI CHILLER @ ASTON PRIMERA BANDUNG


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HITACHI CHILLER @ NOVOTEL BANGKA


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HITACHI CHILLER @ NOVOTEL BANGKA


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heat recovery presentation rev 130213

Documents

heat requirement

hot water temperature

kwh x rp

electric energy

hot waterper

chiller capacity water

hot waterbased

hot waterif