regumaq - zmerly...case study for regumaq vs conventional system. references . main topics central...

Regumaq

Central Domestic Hot Water Stations

for hot potable water preparation

Fresh water station

Requmaq introduction .

Regumaq components and princible of operation .

Capacity and calculation.

Security via thermal treatment.

Integration of Regumaq.

Case Study for Regumaq Vs Conventional System.

References .

Main Topics

Central hot water preparation, continuous flow principle.

No hot water reserve, small system content ( tank less hot

water system ) .

Individual station or cascade control for detached house up

to large installation .

Different heat sources can be used with a buffer storage

cylinder (Oil, gas, renew energy).

Hygienic hot water preparation (No legionella bacteria).

Effective use of energy due to low return temperatures ( low

energy consumption ) .

" Requmaq introduction "

" Regumaq components and principle of operation "

1

2

3

4

56

7

8

10

9

11

Description

1 Entry cold water 10°C

2 Exit warm water 60°C

3 Temperature sensor

4 Entry Circulation 55°C

5 Filling and drain valve .

6 Hot water supply75°C.

7 Hot water return 24°C

8 Flow sensor.

9 Plate Heat Exchanger ss.

10 Tank circulation pump.

11 Buffer tank .

• Regemaq Stations pump heating water from

a buffer Tank Via heating circuit pump.

• It’s used to heat cold water under the flow

principle via stainless steel plate heat exchanger.

• the temperature difference between domestic

hot water temperature and buffer vessel

temperature amounts to max. 5 ºK to 10 ºK.

• This results in a very low return temperature, and

high efficiency is therefore achieved

" Regumaq components and principle of operation "

" Regumaq Capacity and calculation"

- Regumaq X-30

- Regumaq XZ-30

(with circulation connection and

circulation pump)

Regumaq K“ – Cascade control set

- Regumaq X-80

(with possibility for circulation connection)


Performance specification at:

cold water = 10 °C, hot water = 60 °C, Buffer storage cylinder temperature = 75 °C

Set for 1 Regumaq XZ 30- Discharge capacity: 30 l/min.




Set for 1 Regumaq X 80 - Discharge capacity: 66 l/min.


German standard DIN 1988-300

Formila VS = a (ƩVR) b - c

Calculation of peak volume flow (VS) by maximum volume flow (ƩVR)

• Dwelling house 1,48 * (ƩVR) 0,19 - 0,94

• Hospital 0,75 * (ƩVR) 0,44 - 0,18

• Hotel 0,70 * (ƩVR) 0,48 - 0,13

• School 0,91 * (ƩVR) 0,31 - 0,38

• Administration building 0,91 * (ƩVR) 0,31 - 0,38

• Dwelling house for old people 1,48 * (ƩVR) 0,19 - 0,94

• Sanatorium 1,40 * (ƩVR) 0,14 - 0,92


Hot water temperature = 60°C / Heating flow temperature 75°C

1 station

1 dwelling: Σ VR = 0,29 l/s → VS = 0,25 l/s = 15,0 l/min

2 dwellings: Σ VR = 0,58 l/s → VS = 0,40 l/s = 24,0 l/min

3 dwellings : Σ VR = 0,87 l/s → VS = 0,50 l/s = 30,0 l/min

2 stations


3 stations


4 stations

127 dwellings : Σ VR = 36,83 l/s → VS = 2,00 l/s = 120 l/min

5 stations ≙ 290 dwellings

6 stations ≙ 600 dwellings



Gymnasium /swimming-bath

1 station ≙ 5 – 7 showers installed in series (used at once)

2 stations ≙ 10 – 14 showers installed in series









1 station ≙ hotel with 4 rooms

2 stations ≙ hotel with 12 rooms







DN 40

M

J

J

J

J

J

J

J

J

M M M

DN 32DN 40DN 50

DN 32DN 32DN 25

DN 25

DN 40

DN 25DN 32DN 32

Heating side (above) : steel pipe

Potable water side (below) : copper pipe

J J J J

Pipework dimensioning

V

V V V V

Cascade switching operation of 4 „Regumaq“ stations

M M M M

V

J

J

J

J

J

J

J

J

J J J JV V V V

Cascade connection, external circulation pump

- Stations “Regumaq X“ with conversion set for external circulation pump item no.: 138 10 80

- All stations operate in circulation mode, activation of the pump via o n e controller

- Carry out identical settings at all controllers

- Carry out circulation adjustment at the stations/controllers simultaneously

- A constant circulation through the stations and thermal disinfection are guaranteed

Vorlauftemperatur 65 70 75 80 85 °C

30

25

20

15

10

5

0

0 5 10 15 20 25 30 35 40

Flowprim [l/min]

Qsek [l/min]

30

25

20

15

10

Return temp.prim [°C]

Qsek [l/min]

Design chart, potable water hot from 10°C to 60°C

Flow temperature 65 70 75 80 85 °C

Flow volume / Return temperature

Design

- peak volume flow

- number of stations

- boiler capacity

- buffer storage cylinder

- list showing the required

components

Water temperature and growth of legionella

bacteria

Legionella:

100°

50°

40°

20°

0°

Start dying fast

Start dying slowly

Optimum growth

Slow growth

Legionella bacterias are

„sleeping“

Heating water

Potable water - warm

Water for shower

Potable water - cold

microorganism

Water application:

30°

No growth

In Germany every year 12.000 people get ill

because of legionella.

app. 20% of these people die.

● that means app. 2400 deads per year !

The medical journal PHARMIND reported:

„Out of 110 people reported with bad cold 13.6 % were affected with legoinella.

microorganism

This valve with both, its device for the temperature guided regulation of the risers, and

the so-called legionella control will only be able to support the disinfection process

correctly if the hydronic requirements resulting from the DVGW work sheet W 553 were

calculated and set at the valves.

DVGW W 553

“Dimensioning of circulation systems in

central potable water heating installations”

Calculation result:

>Flow distribution from riser to riser

>Manometric pressure of the pump

With due consideration of the basic

rules of the DVGW work sheet W 551

DVGW W 551

“Potable water heating and pipework

installations; technical measures for the

reduction of legionella”

Calculation result:

> Hot water outlet at the potable

water heater 60°C

>Minimum temperature in the

hot water pipe 57°C

>Temperature drop of the back

flowing water 5°C

security via thermal treatment

" Integration of Regumaq "

- Fresh water stations

- Circulation valves

- Water sampling valves

- Buffer storage cylinder

- Cold water circulation

" Integration of Regumaq "

Fresh water stations

- Circulation valves

Water sampling valves

Buffer storage cylinder

Flushing stations

Project Classification: Hotel-General Business Activity-300 Rooms

Project Location: Dubai-UAE

Basis of Design(BoD) for Conventional Storage Water Heater

System:

ASHRAE Handbook-2015”HVAC Application-Chapter 50” Table-

10

Case study


System:

Potable Cold Water Temperature: 20°C

Desired Potable Hot Water Temperature: 60°C

Potable Hot Water Return Temperature: 55°C

Thermal Efficiency of Gas Calorifier: 83%

Auxiliary Heat Back up: Electric Calorifier

Case study


System:

Results of Calculation:-

Case study

Basis of Design(BoD) for Semi-Instantaneous Water Heater

System:


16 and Hunter Method.

Case study

Basis of Design(BoD) for Semi-Instantaneous Water Heater

System:


16 and Hunter Method.Fixture Type Hot Water Demand in Fixture Units @

60°C

Qty Of Fixture Total

Fixtur

e

Demand

Basin , Private Lavatory 0.75 1107 830.25

Basin, Public Lavatory 1 2 2

Dishwasher 5 FU’s per 250 seating capacity 2 10

Kitchen Sink 1.5 31 46.5

Shower 1.5 531 796.5

Total accumulated fixture units 1,685.25

Key Performance Indicator/Parameters Current

Benchmark

Required total hot water flow rate from Curve B @ 100% full demand (L/min) 540

Diversity Factor for Fixture Usage(70%)-(L/min) as per ASPE 378

Total Heat Output for Tankless Stations( 12 Nos) to rise up the temperature from 20°C to

60°C From ASHRAE Table-15, HAVC APPLICATION,Ch-50(KW) considering one station flow rate of 30 L/min

1005

Total Primary Actual Return Flow Rate for Regumag Station(L/min) 330

Hot Water Supply Temperature From Calorifier to Buffer Storage Tank(°C) 75

Minimum Return Temperature from Station to Buffer Tank(°C) 24

Potable Cold Water Supply Temperature(°C) 20

Total Gas Calorifier Heat Output Capacity(Kw) 344

Hot Water Flow Rate of Gas Calorifier (L/min)@ 10°C CWS 96.66

Hot Water Flow Rate of Gas Calorifier (L/min)@ 20°C CWS 123.2

Hot Water Volume (L/hr) 9000

Case study

System Type Conventional Storage Tank Semi-Instantaneous Water Heater

Key Performance Indicator Performance Metric

System ConfigurationCondensing Water Heater with Storage Tank

6 Nos Gas Calorifier+ 4 Nos Electric Calorifier as standbyCondensing Water Heater without Storage Tank( Tankless Water

Heater)

Source of Heat Generation

1- LPG( Propane)

2- Electric Elements as a backup in case of emergency

In case of LPG disruption or emergency, cold water will be bypassed to the Electric Calorifier

Any type of Heat source ( Oil, Gas, Electric, Renewable Energy) due to flexibility of buffer storage tank arrangement

Temperature Control

within the

Calorifier/Buffer Tank

Stratification can be occurred within storage tank due to cold water in the bottom

Always temperature maintained between 58°-60° C. The Buffer

Storage Tank has a separated

plat that segregate the hot water on the top from the bottom.Threshold Temperature @

fixture outlet

Must be kept always @ 60°C Variable from 43°-60° versus required hot water temperature on

the fixture

Hot Water Flow Balancing & Temperature Control

Constant Flow Rate regardless of number of fixture on demand

No Temperature Control on the DRV.

Hot Water Supply Temperature can be adjusted from

the range of 43°-60° C Automatic Balancing & Temperature

Control is accomplished by means of “Aquastrom T Plus”

Calculated Total Domestic Hot Water Capacity (L/hr.)

30,000 @ peak demand

Method 1 has been implemented as per ASHRAE Handbook” HVAC Application-Ch.

50”(Average Hourly Demand)

32,400 @ peak demand

Hunter method has been implemented as per ASHRAE Handbook”HVAC Application-Ch.50”(Hot Water Fixture Demand)

Heating Time & Mass System 2 hours-High Mass System-More Cycling Circulation every 15-mintues interval-Low Mass System. Less Cycling

Total Heat Output

1392KW@100%

974.4@70%

696 KW @ 50%

50% from Total Heat Output has been only considered in the Design.

1005 KW @ 70%(60°C HWS-20° C CWS)

70% Usage Factor as per ASPE for Hotel Application.

System Type Conventional Storage Tank Semi-Instantaneous Water Heater

Key Performance Indicator Performance Metric

Standby LossCalrofier has to be operated periodically even if there is

not hot water is drawn-off to maintain 60°C. Heat loss occurred due to the heat lost thru the flue-exhaust.

No standby loss, however, In case of the greater distance between the buffer storage tank and the station, heat exchanger warm up function will be initiated.

Hot Water Return Line Temperature

Temperature shall be not less than 55°C by continuous heating process

57°C is maintained automatically by means of Aquastrom T Plus valve

Total Heat Input for Gas Calorifier (ȵ= 83%) 870 KW

Calculated Heat input is 840 KW & Selected is 870KW

382 KW

Total Heat Input for Electric Calorifier

465 KW 168 KW built-in Electric Elements(28 KW X 06) in Buffer Tank

Thermal disinfection control & legionella prevention

Must keep temperature @ 60°C or employing the disinfection methods stipulated in ASPE Volume 2 or ASHRAE Std 188-2011

Flush & heat up method can be implemented by means of elevating the temperature to 71- 77°C for 30 minutes without use any chemical treatment or additional disinfection devices.

Service Life Cycle Up to 12 years More than 20 years

Warranty Period 5-10 Years 10-12 Years

Energy Factor(EF) EF: 0.69-0.85 EF≥0.9

System Footprint Required Larger Footprint due to high storage capacity.Despite of exiting buffer storage tank which comprises in

approximate total volume of two

Storage tanks, Required less footprint since the tankless cascade

will be installed on the wall & distributed in a well-defined

manner

Case study

Hospital in Ratingen

79 showers

122 wash basins

3 bathtubs

4 „Regumaq“ stations

„Regumaq K 4“ Cascade control set

Buffer tank 1.000 litres

Gas boiler 250 kW

(for potable water we need 130 kW)

Hospital in Ratingen

Hotel

Hotel with 80 rooms


„Regumaq K 3“ and „K 2“ Cascade control set

Buffer tank 1.500 litres

Calculated boiler heat load = 160 kW

Sports hall / Gymnasium

45 showers

15 wash basins


(3 on the reverse)

2 x Cascade control sets

2 Buffer tanks with 1.000 litres

(in the background)

Heat load to load the tanks = 230 kW

Object example

Conference hotel of the trade association

- 60 hotel rooms

- Restaurant kitchen

- 2x Regumaq X-80

- Buffer storage cylinder 1.000 litres

- Boiler capacity 250 kW

Castle hotel Gevelinghausen

Object example

Seasonal worker accomodation Gierstädt

Many thanks for your

attention!

regumaq - zmerly...case study for regumaq vs conventional system. references . main topics central...

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