Applications and Piping Strategies for Condensing Boilers - Introduction

Transcription

1 Applications and Piping Strategies for Condensing Boilers - Introduction

2 Foil 2, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Webinar Objectives: 1. Control objectives for hydronic systems 2. Review of hydronic fundamental principals 3. System control and piping strategy for condensing boilers 4. Introduction to NEW Vitodens 100 Application Guide

3 Foil 3, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Webinar Objectives: 1. Control objectives for hydronic systems Review of hydronic fundamental principals System control and piping strategy for condensing boilers Introduction to NEW Vitodens 100 Application Guide

4 Foil 4, 10/2015 Viessmann Manufacturing Control Objectives for Hydronic Systems 1. Maximize Occupant Comfort: Maintain a constant room air temperature Vary temperatures as occupants desire. 2. Minimize Energy Consumption: Maximize boiler condensing efficiency Minimize boiler on/off cycling Minimize electrical consumption 3. Protect Equipment: Prevent boiler short cycling Prevent excessive temperature from damaging flooring, tubing, etc.

5 Heat input Applications and Piping Stratigies Foil 5, 10/2015 Viessmann Manufacturing Heat loss The Control Challenge 1. Maintain a constant room temperature, with constantly changing conditions. Heat loss through building envelope Outdoor air temperature changes Objective: Constant temperature Solar Gain Heat loss Internal gain: People, equipment lights Infiltration and wind losses

6 Foil 6, 10/2015 Viessmann Manufacturing The Control Challenge 2. Control a multiple function, multiple temperature system. Fan coil Pool or spa heating Heat Exchanger Snowmelting Heat Exchanger High-temp RFH wood sub-floor DHW Low-temp RFH concrete slab 70 o F-110 o F

7 Foil 7, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Webinar Objectives: 1. Overview of control objectives for hydronic systems 2. Review of hydronic fundamental principals System control strategy and component selection Piping strategies for condensing boilers Introduction to NEW Vitodens 100 Application Guide

8 Foil 8, 10/2015 Viessmann Manufacturing Understanding Hydronic Fundamentals The Universal Hydronics Formula GPM = BTU/hr ( T x 500) Why is this formula important to understand? Sizing pipes Sizing pumps Sizing Low loss headers, zone valve, air scoops, etc Trouble shooting systems Controlling heat transfer rates

9 Foil 9, 10/2015 Viessmann Manufacturing Understanding Hydronic Fundamentals The Universal Hydronics Formula GPM = BTU/hr ( T x 500) WHERE: GPM = Fluid flow rate in gallons per minute BTU/hr = Heat Loss at design temperature of area being heated T = Temperature drop across the piping circuit (Typically o F) 500 = 8.33 lb/gal x 60 min/hr x 1 (Specific heat or water - Btu/lb./ o F)

10 Foil 10, 10/2015 Viessmann Manufacturing Understanding Hydronic Fundamentals The Universal Hydronics Formula GPM = BTU/hr ( T x 500) 9 GPM 180 o F GPM = BTU/hr (20 x 500) Typical hydronic system: 20 o F temperature drop GPM = BTU/hr 10,000 90,000 BTU/hr 160 o F

11 Foil 11, 10/2015 Viessmann Manufacturing Understanding Hydronic Fundamentals The Universal Hydronics Formula GPM = BTU/hr ( T x 500) Controlling the Rate of Heat Output: Control the flow Control the water temperature Room thermostat Rate of heat output M

12 Foil 12, 10/2015 Viessmann Manufacturing Understanding Hydronic Fundamentals The Universal Hydronics Formula GPM = BTU/hr ( T x 500) Flow Controls: On-off (zone valves/pumps) Balancing Water temperature controls Boiler outdoor reset Mixing valves Thermostatic Motorized Rate of heat output Room thermostat M Outside air sensor

13 Foil 13, 10/2015 Viessmann Manufacturing Outdoor Reset Control Why use it? 1. Comfort Consistent, even space temperatures Constant heat output to match the load Keep up vs Catch up 2. Efficiency Eliminate overheating Increases condensing in boiler Longer boiler run times Lower standby losses

14 Foil 14, 10/2015 Viessmann Manufacturing Temp Range o C / o F Boiler / supply water temperature Outdoor Reset Control How does it work? Heating curves Heat loss changes continuously with outdoor temperature Water temperature is varied based on outside air temperature Heat output of boiler (or mixing device) now matches heat loss of building Outdoor temperature

15 Foil 15, 10/2015 Viessmann Manufacturing Outdoor Reset Control Heating curve selection High temp heating system, eg Fin tube radiation, fan coils Medium temp heating system, eg Cast iron radiation, Staple-up RFH Low temp heating system, eg Radiant floor heating Controls Foil 15 03/05

16 Foil 16, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Webinar Objectives: 1. Overview of control objectives for hydronic systems 2. Review of hydronic fundaments principals 3. System control and piping strategy for condensing boilers Piping strategies for condensing boilers Introduction to NEW Vitodens 100 Application Guide

17 Foil 17, 10/2015 Viessmann Manufacturing Control Strategy And Component Selection Where do you start? 1. What are the system water temperature requirements? Low, medium or high temp emitters Multiple function, multiple temp systems DHW heating requirements 2. What are the boilers requirements High mass / Low mass construction Minimum / Maximum flow rates Maximizing condensing efficiency 3. What are the zoning requirements? Areas experiencing solar gain or internal heat gains Areas with different use patterns Night or weekend temperature setback

18 Foil 18, 10/2015 Viessmann Manufacturing Control Strategy And Component Selection 1. Typical hydronic emitters water temperature requirements High temperature emitters: Finned tube baseboard Air heat fancoils Pool/spa heat exchangers DHW production o F o F o F o F Medium temperature emitters: Cast iron radiators Low mass radiant floor ie: wood joist floors o F o F Low temperature emitters: High mass radiant floor ie: concrete floors Snowmelting systems o F o F

19 Foil 19, 10/2015 Viessmann Manufacturing Boiler efficiency % Control Strategy And Component Selection 2. Boiler requirements Temperature How do you maximize the efficiency of condensing boiler? o F Dew Point of Natural Gas Condensing mode Non-Condensing mode Boiler return water temp o F 140 o F 120 o F

20 Foil 20, 10/2015 Viessmann Manufacturing Control Strategy And Component Selection 2. Boiler requirements Construction Vitodens 100 / 200 series: Low mass HX construction Low water content Minimum and Maximum flow rate requirements Higher friction loss through heat exchanger Maximum boiler temperature limitations (= 167 o F or 176 o F) Vitocrossal 300, CU3A series: High mass HX construction High water content No Minimum flow rate requirements Lower friction loss through heat exchanger Maximum boiler temperature limitations (= 194 o F)

21 Foil 21, 10/2015 Viessmann Manufacturing Control Strategy And Component Selection 2. Boiler requirements Piping Vitodens 100 / 200 series: To avoid short cycling, flow must be maintained Dedicated boiler pump usually required Primary-secondary piping usually required Closely spaced tees or Low loss header Vitocrossal 300, CU3A series: Not flow sensitive Dedicated boiler pump not required Primary secondary not required

22 Foil 22, 10/2015 Viessmann Manufacturing Control Strategy And Component Selection 2. Boiler requirements Piping Primary-Secondary piping Piping directly to system

23 Foil 23, 10/2015 Viessmann Manufacturing Control Strategy And Component Selection 2. Boiler requirements Hydraulic separation with Primary-Secondary Piping Option 1: Closely spaced Tees Option 2: Low Loss Header

24 Foil 24, 10/2015 Viessmann Manufacturing Control Strategy And Component Selection 2. Boiler requirements Hydraulic separation with Primary-Secondary Piping This pump only has to over come the friction loss of the heat emitters and secondary loop piping Happy boiler: Always gets the flow it needs Less likely to short cycle Not affected by on/off zones Secondary Loop Primary Loop This pump only has to over come the friction loss of the boiler and primary loop piping

25 Foil 25, 10/2015 Viessmann Manufacturing Control Strategy And Component Selection 2. Boiler requirements Low Loss Header operation Mixing occurs within the hydraulic separator. Secondary Primary Secondary Primary Primary flow higher than secondary flow Secondary flow higher than primary flow

26 Foil 26, 10/2015 Viessmann Manufacturing Control Strategy And Component Selection 3. Zoning requirements Multiple zone pumps Thermostatically controlled zone pumps Higher electrical consumption Flow balance with speed control Multizone control

27 Foil 27, 10/2015 Viessmann Manufacturing Control Strategy And Component Selection 3. Zoning requirements Single pump, multiple zone valves Thermostatically controlled zone valves Lower electrical consumption Individual loop control for RFH With single speed pump use pressure bypass valve to balance flow M M M Multizone control Single speed pump Pressure bypass valve

28 Foil 28, 10/2015 Viessmann Manufacturing Control Strategy And Component Selection 3. Zoning requirements Single pump, multiple zone valves Thermostatically controlled zone valves Lower electrical consumption Individual loop control for RFH Variable speed pump to balance flow M M M Multizone control Variable speed pump

29 Foil 29, 10/2015 Viessmann Manufacturing Control Strategy And Component Selection Time to start designing! 1. System water temperature requirements Separate heating circuits by temperature Use mixing valves to satisfy lower temperatures 2. Boilers requirements Size boiler to match heating load Pick piping strategy to meet boiler construction 3. What are the zoning requirements? Add zone controls to meet zoning demands of building

30 Foil 30, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Webinar Objectives: 1. Overview of control objectives for hydronic systems 2. Review of hydronic fundaments principals 3. System control and piping strategy for condensing boilers 4. Introduction to NEW Vitodens 100 Application Guide

31 Foil 31, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide First module for Vitodens 100 introduced in November 2015 Installer / Designer assistance for: Component selection Hydronic piping layouts Wiring diagrams Control Programing / coding Design tips Future modules Vitodens 200, Vitodens 222-F

32 Foil 32, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Boiler Nomenclature

33 Foil 33, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Recommended Product Application

34 Foil 34, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Component Index

35 Foil 35, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Piping Layouts

36 Foil 36, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Wiring Layouts

37 Foil 37, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Set-up and Programming

38 Foil 38, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Application # 1

39 Foil 39, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Application # 2

40 Foil 40, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Application # 3

41 Foil 41, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Application # 4

42 Foil 42, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Application # 5

43 Foil 43, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Application # 6

44 Foil 45, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Phase 2 Vitodens 200 piping Motorized mixing valve

45 Foil 46, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Phase 2 Vitodens 200 piping Motorized mixing valves

46 Foil 47, 10/2015 Viessmann Manufacturing Applications and Piping Strategies for Condensing Boilers Application Guide Phase 2 Vitodens 200 piping

47 Foil 48, 10/2015 Viessmann Manufacturing For More Information 1. Contact your local Viessmann Sales Representative 2. Download literature and technical manuals by going to the ProLogin section of the Viessmann website: nuals.html 3. Get more training at one of our in-depth 1 or 2-day Academy seminars. Go to the Academy section of the Viessmann website for the full schedule of all our inhouse training.

48 Applications and Piping Strategies for Condensing Boilers - Introduction