Hot Water Generation for Commercial and Industrial Applications. Paul Marsden Specification Sales Manager
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1 Hot Water Generation for Commercial and Industrial Applications Paul Marsden Specification Sales Manager
2 Baxi and BDR Thermea Baxi is part of the BDR Thermea Group, a global manufacturer and distributor of hot water & heating systems and services, with turnover in excess of 1.8bn other BDR Thermea brands BDR Thermea employs over 6300 people in more than 70 countries worldwide The Group has a top market position in Western Europe and strong positions in rapidly growing markets 2
3 The UK s No.1 Direct Fired Water Heater supplier UK Brands The UK s No.1 Commercial Boiler supplier The UK s No.1 Mini-CHP supplier Turnover circa 60m A comprehensive portfolio of LZC technologies The most comprehensive range of Hot Water, Heating and LZC solutions of any manufacturer within the UK 3
4 Agenda 1. Types of hot water generation Indirect Calorifiers Direct Cylinders Plate heat exchangers Electric point of use Direct gas fired water heaters Storage Continuous flow Low water content 2. LZC pre heat 3. System separation and decentralisation Why direct gas fired hot water generation? 4. Emissions, efficiencies and running cost 5. Direct gas fired water heaters, principles of design 6. Andrews Condensing direct gas fired water heaters
5 Indirect Calorifiers Types of Hot Water Generation
6 Calorifiers A Calorifieris an industry term for a storage vessel that has the capacity to generate heat within a mass of stored water Capacities 400 litres plus Pros Existing boiler capacity No flue required Historical Cons Weight Physical size Recovery time Stand by heat loss Boilers need to operate at 80/60* *For DHW generation
7 Direct Cylinders Types of Hot Water Generation
8 Cylinders A hot watercylinderis a water tank that is used for storing hot water for space heating or domestic use Capacities 400 litres plus Immersion heater 5 60 kw (single& 3-phase) Pros Existing Boiler capacity No flue required Off mains gas Historical Cons Weight Physical size Recovery time Stand by heat loss
9 Plate Heat Exchangers Types of Hot Water Generation
10 Plate heat exchangers A plate heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids Capacities 30 kw plus Pros Existing Boiler capacity Suited to refurbishment No flue required Compact Cons Higher boiler rating Maintenance (plates) Often used with cylinders (weight / recovery time) Boilers need to operate at 80/60* * For DHW generation
11 Electric Point of Use Types of Hot Water Generation
12 Electric point of use Either single point (typically over a sink or basin) or multipoint(typically located beneath a sink or wall hung and serving a small number of outlets Capacities litres Heater elements 1-6 kw Pros Reduced pipework Siting options No flueing Weight No gas Cons Weight Limited flow Maintenance Recovery rate Water capacities
13 Direct Gas Fired Types of Hot Water Generation
14 Direct gas fired water heaters Either storage, low water content orcontinuous flowand with the burner assembly located within or adjacent to the water storage vessel Capacities litres Outputs kW Pros Reduced storage Small footprint Fast recovery Low weight Flueing Cons Flueing Gas pipework
15 Direct gas fired water heaters Continuous Flow Water Heater Storage Water Heater Low Water Content Water Heater
16 Water Quality and Treatment Both Sediment and Limescalecan impact upon the efficiency and lifecycle of all hot water generators We would advise always to use some form of water treatment when installing gas fired water heaters Seek advice from water treatment specialists
17 Low Zero Carbon pre heat Utilising low carbon / renewable technologies to pre heat the cold water supply to the buildings hot water system Solar Thermal Combined Heat and Power Air source heat pump Ground source heat pump
18 Low Zero Carbon pre heat Pump on when delta T = or > 7 O K Pump off when delta T < or = 3 O K Single Coil Pre-Heat Solution with a Direct Gas Fired Water Heater 60 c
19 Low Zero Carbon pre heat R-Gen 20/44 CHP c/w Buffer Vessel, Preheat Cylinders and MAXXflo Water Heaters
20 System separation and decentralisation Heating Loads Heating is a seasonal requirement, however when required there is a constant demand throughout the day 30 Typical Building Heating Profile Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
21 System separation and decentralisation Hot water loads Hot water is an annual requirement however required there are peaks and troughs in demand throughout the day Typical Daily Hot Water Profile
22 System separation and decentralisation Therefore It seems senseless to generate both of these differing loads from the same plant. Much better to have separate dedicated plant more closely matched to their specific requirements
23 System separation and decentralisation Specsavers, Southampton
24 Efficiencies, emissions & running costs Running cost comparison WATER HEATER RUNNING COST COMPARISON CHART FUEL PRICE/kW/h METHOD OF HEATING NOMINAL THERMAL EFFICIENCY NOMINAL SYSTEM EFFICIENCY UNITS REQUIRED COST TO HEAT ºC TEMP RISE Storage water heater 79% 62% pence Non storage water heater 85% 65% pence NATURAL GAS 2.7 pence Condensing storage water heater 96% 62% pence Condensing nonstorage water heater 98% 65% pence Boiler/Heat exchanger 81% 56% Pence ELECTRICITY 9 pence Storage/Immersion heater 90% 76% pence Based on the cost of heating 500 litres of water through a temperature rise of 50 ºC Output (units) required: 4.18 x 500 x 50 / 3600 = 29.03kW/h Natural Gas Electricity Source Non-Domestic Consumer price of 2.7 pence per kwh Non-Domestic Consumer price of 9 pence per kwh Department of Energy and Climate Change Quarterly Energy Prices Qtr medium building
25 Efficiencies, emissions & running costs Emissions 500 Hot water consumption (litres) Time (hours) 24 School hot water consumption profile (CIBSE Guide G)
26 Efficiencies, emissions & running costs Emissions Direct gas fired water heaters Gas fired boilers and calorifiers Electric heaters CO 2 emissions / year 4.89 tonnes 6.52 tonnes 7.31 tonnes CO 2 emissions / kw/h 0.19 kg/kwh 0.19 kg/kwh 0.43 kg/kwh Consumption / year 25,755 kwh 34,340 kwh 16,993 kwh System efficiency 64% 60% 97% DHW temperature rise 44 C 55 C 44 C CO 2 emissions / kw/h = grid emission factor for natural gas and electricity School hot water consumption profile (CIBSE Guide G)
27 Direct Gas Fired Water Heaters Principles of Design
28 Direct gas fired water heaters Direct Gas Fired Water Heaters Inputs kw Storage capacities litres Recovery rates* litres/sec ( litres/hr) Efficiencies* 74 99% Stainless steel storage tank and heat exchanger options High efficiency condensing and high efficiency options Conventional and balanced flue options Glass lined steel storage tank options Copper heat exchanger options * Recovery rate based on a 50 Celsius temperature rise * Efficiency based on Gross CV
29 Direct gas fired water heaters Direct Gas Fired Water Heaters A traditional glass lined direct gas fired storage water heater
30 Condensing Direct Gas Fired Water Heaters Principles of Design
31 Condensing Water Heaters principles of design Tank with internal flue tube/coil gives shorter condense time as whole tank gets warm when burner is firing External heat exchanger gives maximum condense time due to cold return water enabling burners to remain on high fire longer thus giving quicker recovery
32 Condensing Direct Gas Fired Water Heaters Options
33 High efficiency condensing gas fired water heaters Storage MAXXflo Stainless steel storage water heater External heat exchange modules Outputs Storage capacities Recovery rates kw 200 & 300 litres litres/hr 30 kw heat exchanger module
34 High efficiency condensing gas fired water heaters Storage MAXXflo Stainless steel storage water heater External heat exchange modules Outputs Storage capacities Recovery rates kw 200 & 300 litres litres/hr
35 High efficiency condensing gas fired water heaters Storage MAXXflo Stainless steel storage water heater External heat exchange modules Outputs Storage capacities Recovery rates kw 200 & 300 litres litres/hr
36 High efficiency condensing gas fired water heaters Storage MAXXflo
37 High efficiency condensing gas fired water heaters Storage ECOflo Glass lined steel storage water heater Downward firing burner Ouputs Storage capacities Recovery rates kw 230 & 380 litres litres/hr
38 High efficiency condensing gas fired water heaters Storage ECOflo Glass lined steel storage water heater Downward firing burner Ouputs Storage capacities Recovery rates W 230 & 380 litres litres/hr Unique triple pass heat exchange design maximises transfer of heat from combustion gas heat into the stored water
39 High efficiency condensing gas fired water heaters Low water content SUPAflo EVO Stainless steel low water content water heater Water cooled downward firing burner Outputs Recovery rates kw litres/hr Buffer vessel options litres
40
41 High efficiency condensing gas fired water heaters Low water content SUPAflo EVO Stainless steel low water content water heater Water cooled downward firing burner Outputs kw Flue gas Air Gas Recovery rates litres/hr Burner Buffer vessel options litres C C 1st Heat Exchanger C 2nd Heat Exchanger 3rd Heat Exchanger T Fluegas = T Flow 78 C Condense
42 High efficiency condensing gas fired water heaters Low water content SUPAflo EVO Stainless steel low water content water heater Water cooled downward firing burner Outputs kw Recovery rates litres/hr Buffer vessel options litres Unique patented combustion technology NOx = > 38 mg/kwh (Class 6) CO = > 14 mg/kwh
43 High efficiency condensing gas fired water heaters Low water content SUPAflo EVO c/w SFB Buffer Vessel SFB Buffer Vessel
44 High efficiency condensing gas fired water heaters FASTflo Plus Finned copper tube continuous flow water heater Stainless steel secondary heat exchanger Wall hung Outputs Recovery rates* 42 & 56 kw litres/min * Recovery rate based on a 50 Celsius temperature rise
45 High efficiency condensing gas fired water heaters Continuous flow FASTflo Plus
46 High efficiency condensing gas fired water heaters Continuous flow FASTflo Plus
47 Additional Support Now that the method of how to heat water has been determined, the next step is to calculate how much hot water is required Size-it (electronic web based water heater sizing program) 40 years experience we know how buildings use hot water SBEM Benefits BIM Files, CAD Files
48
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