Innovative Boiler & Heat Exchanger Concepts

Transcription

1 Wallace Eannace Associates Presents: Innovative Boiler & Heat Exchanger Concepts for Plumbing Applications Bob Barrett, CEM, LEED AP Sales Engineer Wallace Eannace Associates, Inc. Mobile:

2 Wallace Eannace Associates Presents: Innovative Boiler & HXR Concepts - Piping for Higher Efficiency - BPHXR for DHW -BPHXR for High Rise DHW Re-heat - 150% Redundancy with 25% Less Capacity

3 Piping for Higher Efficiency

4 Conventional DHW Heater

5 Piping i for Higher Efficiency i High- Efficiency Separate

6 Piping for Higher Efficiency Non-Condensing Condensing 40F - 50F 40F - 50F 100F- 110F 140F 180F - 190F 140F 145F - 165F 135F 140F 100F- 110F 80F - 120F 135F 140F

7 Piping for Higher Efficiency DHW (+) Domestic Water ~ 40F to 50F

8 Brazed Plate Heat Exchangers for Domestic Hot Water (BPX for DHW)

9 BPX for DHW If you are used to this.. Why consider this... Boiler with Indirect DHW Tank Boiler with Indirect (BPH + Tank)

10 BPX for DHW -Stainless Steel Tank -Stainless Steel HXR -2 Foam Insulation (R=13.4) There are good Indirect DHW on the market, but is there a better way?

11 BPX for DHW - Safety BPXTM BPDW Double-Wall Provides True double-wall construction, including port regions Double-wall plate design with air vent leak paths Complete peripheral braze for additional strength Four dedicated leak ports for quick and easy leak detection (A) Excellent performance for domestic water applications Dependable protection of fresh water streams from polluted fluid steams Notes: 1) Most Indirect DHW heaters (tubes-in-tank type) are single wall with multiple points for failure. If compromised, contamination of domestic water with boiler water occurs. Double walled BPX eliminate the possibility of cross contamination providing greater safety. 2) Most Indirect DHW heaters are sized for 180F to 160F (Delta-T=20F). BPX can be sized for lower inlet water temperatures and larger delta-t s (160F to 100F), providing condensing boilers with lower return temps -> Greater efficiency.

12 Piping for Higher Efficiency DHW (+) Domestic Water ~ 40F to 50F

13 Cooling Tower WSHP Innovative Concepts BPX for DHW - Applied Injection Pump (during Cooling mode) 60F 70F Radiation Check VLV. 160F 180F Injection Pump (during Heating mode) Auto Air Vent C.W. Fill Check VLV. 180F Air Sep. Exp. Tank Check VLV. 100F DHW Return Indirect DHW heater via BPX -DHW pumps activated via Tank Sensor Lochinvar Crest Boiler 2.0 MMBH Lochinvar Crest Boiler 2.0 MMBH Lochinvar Crest Boiler 2.0 MMBH B P H X R DHW Tank 140F Check VLV. Domestic Cold Water Fill M DHW to the Building 50F 120F Advantages -Double Wall HXR -Low boiler return water temperatures -Rapid recovery rate -Reduced storage tank size Hot Side EWT: 160F LWT: 100F Cold Side EWT: 90F LWT: 150F

14 Cooling Tower WSHP Innovative Concepts BPX for DHW - Applied Injection Pump (during Cooling mode) 60F 70F Radiation Check VLV. 160F 180F Injection Pump (during Heating mode) Auto Air Vent C.W. Fill Check VLV. M Valve closed during summer months Valve open during HVAC heating mode Summer Operation 180F Hot Side EWT: 160F LWT: 100F Cold Side EWT: 90F LWT: 150F Air Sep. Exp. Tank Check VLV. Heating Mode Operation Hot Side EWT: 160F LWT: 100F Cold Side EWT: 50F LWT: 150F Lochinvar Crest Boiler 2.0 MMBH Lochinvar Crest Boiler 2.0 MMBH Lochinvar Crest Boiler 2.0 MMBH B P 100F Check VLV. DHW Return Domestic Cold Water Fill M 120F 50F Indirect DHW heater via BPX -Provides semi-instantaneous DHW during heating mode -DHW pump activated via Tank Sensor (rarely activated during heating mode) -Utilizes System Pumps (even during summer) - DHW & System pump enabled in summer via Tank Sensor Valve open during summer months Valve modulates open/closed during HVAC heating mode M H X R T DHW Tank 140F DHW to the Building Advantages -Provides semi-instantaneous DHW during heating mode -Double Wall HXR -Low boiler return water temperatures -Rapid recovery rate -Reduced storage tank size

15 BPX for DHW - Applied Semi-Instantaneous Indirect DHW Heater DHW Return M B P Domestic Cold Water Fill A H X R M 120F B P T H X R DHW Tank DHW to the Building - BPX or P/F HXR can be sized for boiler side EWT=160F, LWT=100F - Tempered DHW (ex: max temp: 150F) - Dual BPHXR s (for flows in excess of single max cap.) - Double wall BPHXR to prevent cross contamination - DHW storage tanks can be downsized (sized to prevent short cycling)

16 BPX for DHW - Product Offering Packaged Plate Water Heaters Boiler Water Packaged Solutions Vertical Packaged Storage Plate Water Heaters Boiler Water

17 BPHXR for DHW - Product Offerings High Capacity Condensing boilers with: - Amazing Turndown- 25:1 (4% of full load capacity) *(DHW) - High Efficiency: 92% AHRI thermal efficiency - up to 99% efficient with low temp. return water - Minimum gas pressure required is only 4-in.w.g. - Easy to read and understand 8 wide color graphic interface - Smart System controller capable of: * Sequencing up to (8) boilers running in parallel * Boiler reset based off outside air temperature * Set point prioritization based off domestic hot water * Software for computer interface including real-time display, set point manipulation, data logging, etc. * Controls three pumps - Boiler pump - System pump - Domestic hot water pump

18 BPX for DHW - Summary... So why use double wall brazed plate heat exchangers as a means for indirect domestic hot water generation? Stated another way - Why use DWBPX for DHW? 1) Safety - Eliminate cross contamination concerns (< liability) Increased Efficiency - Drive condensing boilers into condensing mode more hours of the year ($) Save first cost, floor space, while adding system redundancy...

19 BPX for High Rise DHW Reheat

20 BPX for High Rise DHW Reheat High rise building with multiple pressure zones Options: A) Create separate systems per pressure zone Pros - Pressure issues eliminated Cons - Multiple systems - More Equipment & less redundancy - More maintenance B) Provide common systems shared between the pressure zones Pros - Less Equipment & more redundancy Cons - Possible balancing issues - Possible additional energy demand

21 BPX for High Rise DHW Reheat Traditional High Rise DHW Recirculation Loop with common mechanical room

22 BPX for High Rise DHW Reheat Decoupled High Rise DHW Recirculation Loop with common mechanical room

23 BPX for High Rise DHW Reheat Summary Decoupled High Rise DHW Recirculation Loop with common mechanical room Pros - Less Equipment $ - Greater redundancy (< pain) - Easier to design & install (< pain) - Less energy consumed $ - Lower first costs $ - Lower operating costs $ - Lower maintenance $ + (< pain) Eliminates Cons - Eliminates balancing issues (< pain) - Eliminates additional energy demand $

24 150% Redundancy for 25% Less

25 100% Redundancy - Conventional Redundancy Boiler #1 Primary 2.0 MMBH Conventional 100% Redundancy Boiler #2 Back-up 2.0 MMBH Boiler Plant: 4.0-MMBH total DHW Heater #1 Primary 500-MBH DHW Heater #2 Back-up 500-MBH DHW Storage Tank DHW Plant: 1.0-MMBH Total Purchased Capacity: 5.0-MMBH Conventional 100% Redundancy To achieve 100% redundancy in a conventional system, the designer isolates the system, then doubles the capacity and components so that if one element fails, the exact replacement comes online. There is nothing wrong with this concept but is there a better way? Can you achieve more redundancy with a lower first cost?

26 150% Redundancy - Less is More Boiler #1 Primary 1.0 MMBH 150% Redundancy 150% Redundancy To achieve 150% redundancy take the calculated Boiler #2 Primary 1.0 MMBH Boiler #3 Back-up 1.0 MMBH Boiler Plant: 3.0-MMBH total DHW BP- HXR 500 MBH DHW Storage Tank DHW Plant: 0 25% Less Boiler Capacity (-) 15% if DHW priority controls utilized Total Purchased Capacity: 3.0-MMBH capacity requirement, divide it in half, then provide (3) units at that capacity. This will provide 150% redundancy with 25% less purchased capacity. The DHW can be served without adding capacity to the system by integrating the boiler plant & the domestic hot water, using a double wall heat exchanger (a passive devise), and utilizing DHW priority boiler controls. This will reduce the total plant purchased capacity by 40% to 50% (assuming a DHW load equal to 25% to 50% of the boiler load).

27 150% Redundancy - Summary Use 150% Redundancy to: Lower first cost $ Save floor space $ P t ti l ti i $ Potential venting savings $ Add additional system redundancy $ Take advantage of product integrated controls $$ -> $

28 Wallace Eannace Associates Presents: Innovative Concepts