regumaq - zmerly...case study for regumaq vs conventional system. references . main topics central...
TRANSCRIPT
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)
" Regumaq Capacity and calculation"
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 2 Regumaq XZ 30- Discharge capacity: 60 l/min.
Set for 3 Regumaq XZ 30- Discharge capacity: 90 l/min.
Set for 4 Regumaq XZ 30- Discharge capacity: 120 l/min.
Set for 1 Regumaq X 80 - Discharge capacity: 66 l/min.
" Regumaq Capacity and calculation"
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
" Regumaq Capacity and calculation"
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
15 dwellings : Σ VR = 4,35 l/s → VS = 1,02 l/s = 61,0 l/min
3 stations
48 dwellings : Σ VR = 13,92 l/s → VS = 1,50 l/s = 90,0 l/min
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
" Regumaq Capacity and calculation"
Hot water temperature = 60°C / Heating flow temperature 75°C
Gymnasium /swimming-bath
1 station ≙ 5 – 7 showers installed in series (used at once)
2 stations ≙ 10 – 14 showers installed in series
3 stations ≙ 15 – 20 showers installed in series
4 stations ≙ 20 – 27 showers installed in series
5 stations ≙ 25 – 33 showers installed in series
6 stations ≙ 30 – 40 showers installed in series
7 stations ≙ 35 – 47 showers installed in series
8 stations ≙ 40 – 54 showers installed in series
" Regumaq Capacity and calculation"
Hot water temperature = 60°C / Heating flow temperature 75°C
1 station ≙ hotel with 4 rooms
2 stations ≙ hotel with 12 rooms
3 stations ≙ hotel with 25 rooms
4 stations ≙ hotel with 45 rooms
5 stations ≙ hotel with 70 rooms
6 stations ≙ hotel with 100 rooms
7 stations ≙ hotel with 140 rooms
8 stations ≙ hotel with 185 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
Basis of Design(BoD) for Conventional Storage Water Heater
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
Basis of Design(BoD) for Conventional Storage Water Heater
System:
Results of Calculation:-
Case study
Basis of Design(BoD) for Semi-Instantaneous Water Heater
System:
ASHRAE Handbook-2015”HVAC Application-Chapter 50” Table-
16 and Hunter Method.
Case study
Basis of Design(BoD) for Semi-Instantaneous Water Heater
System:
ASHRAE Handbook-2015”HVAC Application-Chapter 50” Table-
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
5 „Regumaq“ stations
„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
7 „Regumaq“ stations
(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!