Design of the PH heating/ventilation system 26 March 2010 Peter - - PowerPoint PPT Presentation

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Design of the PH heating/ventilation system 26 March 2010 Peter - - PowerPoint PPT Presentation

Aug 13, 2023 433 likes •556 views

Design of the PH heating/ventilation system 26 March 2010 Peter Reppe Peter Reppe SOLARC Architecture / Engineering Inc., Eugene, OR Regional PassiveHaus Northwest Gathering Regional PassiveHaus Northwest Gathering 2010 Summary, Mechanical

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SLIDE 1

Design of the PH heating/ventilation system

26 March 2010

Peter Reppe Peter Reppe SOLARC Architecture / Engineering Inc., Eugene, OR

Regional PassiveHaus Northwest Gathering Regional PassiveHaus Northwest Gathering 2010

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SLIDE 2

Summary, Mechanical Systems in Passive Houses

26 M h 2010

Houses

26 March 2010

  • Glossary for the non-engineer
  • Unique aspects of PH mechanical systems
  • System options / variations (esp. for NW

y p ( p climate)

  • Interaction between mech system and other

y uses (hot water, dryer, lights)

  • Ducts / diffusers (locations, layout, products)

( , y , p )

  • Controls (how and why)
  • Integration of Renewables

Integration of Renewables

  • Basics of equipment sizing
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SLIDE 3

Glossary for the non-engineer

26 M h 2010

12,000 14,000 16,000 18,000 20,000 erms 60.0% 70.0% 80.0% 90.0% 100.0% nt Load

26 March 2010

  • Ventilation
  • 2,000

4,000 6,000 8,000 10,000 20 40 60 80 100 120 OSA Temperature, F MBH or the 0.0% 10.0% 20.0% 30.0% 40.0% 50.0% Percent Plan

  • Peak heating/cooling load

Input MBH Bin Hours Baseline Gas Use FEM-1 Gas Use % Input Plant

  • Load vs. consumption
  • Supply-, return-, outside-, exhaust-air

Supply , return , outside , exhaust air

  • OA economizer
  • Types of heating

Equipment Equipment

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SLIDE 4

Unique aspects of PH mechanical systems

26 M h 2010 26 March 2010

  • Low air flow rates
  • Variable speed fans
  • Low supply air speeds into space
  • Little/no temperature stratification in

Little/no temperature stratification in bldg. 100% t id i t

  • 100% outside air system
  • Ultra-low flow-resistance ductwork
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SLIDE 5

System Options in moderate Pacific Northwest Climate

26 M h 2010

Climate

26 March 2010

  • Heat or energy recovery

til t ventilator

  • Heating options:

– Electric resistance (air / hydronic) – (Air-Source) Heat pump (S.S.) – Wood / Natural Gas (hydronic) Wood / Natural Gas (hydronic) – Solar (air / hydronic)

  • Cooling options:

– Prevention3 + passive cooling (+ waste “coolth”) – Earth tube – (Hydronic Coil) – (Air-Source) heat pump

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SLIDE 6

Interaction w/ other systems

26 M h 2010 26 March 2010

  • Domestic hot water
  • Stove / Hood
  • Dryer
  • Lights

Lights

  • Fridge
  • Other appliances,

gadgets g g

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SLIDE 7

Air transport and delivery

26 M h 2010 26 March 2010

  • Ducts
  • Diffusers, Return grilles
  • Transfers
  • Silencers

Silencers

  • T&B
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SLIDE 8

Controls

26 M h 2010 26 March 2010

  • KISS
  • Temperature
  • Supply Air flow rate
  • (Outside Air flow rate)

(Outside Air flow rate)

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SLIDE 9

Integration of Renewables

26 M h 2010 26 March 2010

  • Electric systems

Electric systems

–Photovoltaics –Micro-Hydro –Micro-Wind Micro-Wind

  • Solar Thermal

–Hot Water Air collectors –Air collectors

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SLIDE 10

Equipment sizing, basics

26 M h 2010 26 March 2010

  • Ventilation (V in cfm)

Ventilation (V in cfm)

–PHPP, “Ventilation“ tab or ASHRAE 62

  • Heating (Q in Btu/hr)

PHPP “Heat Load“ tab Q84

(+ ?? %)

–PHPP, Heat Load tab, Q84 (+ ?? %)

  • Equipment sizing

q p g

–Coils: rated capacity in Btu/h or Watts Ai Q 1 085 V ( f ) ∆T (°F) –Air: Q = 1.085 x V (cfm) x ∆T (°F) –Hydronic: Q = 500 x GPM x ∆T (°F) Hydronic: Q 500 x GPM x ∆T ( F)

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SLIDE 11

Questions…

26 M h 2010 26 March 2010

The End (or the beginning?) beginning?)