copyrighted © 2000 pg&e all rights reserved case initiative project energy analysis review of...

Copyrighted © 2000 PG&E All Rights Reserved

CASE Initiative Project

Energy AnalysisReview of Implications

Jon McHugh, Sr. Project Mgr.The HESCHONG MAHONE GROUP

forPacific Gas & Electric Co.

Codes & Standards Program



Residential Energy Model

1761 SF house with equal glazing distribution in each direction

Hourly energy values from TDV research version of MICROPAS

A/C and Heat Pump Efficiency adjusted with respect to ambient temperature

DHW loads allocated to 4 load profiles from PG&E load survey data• weekday vs. weekend • summer vs winter



Residential TDV Energy Costs

Hourly energy multiplied by hourly energy costs for all 8,760 hours of the year

30 Year PV, 3% real discount rate Three energy sources:

• Electricity• Natural gas• Propane

Multiplies by hourly TDV costs for five CA climate zones:3 (Oakland), 6 (Long Beach), 13 (Fresno),14 (China Lake) 16 (Shasta)



Fresno Residential Measures

$0.00

$1.00

$2.00

$3.00

$4.00

$5.00

$6.00

Ins

Cei

ling

Fur

nace

Ins

Cei

ling

HP

Low

-eF

urna

ce

Low

-e H

P

SEE

R 1

0to

12

Ele

c to

Fue

l DH

W

HP

toF

urna

ce

Flat NG (Original)

TDV Nat Gas

TDV Propane



Shasta Residential Measures

$0.00

$2.00

$4.00

$6.00

$8.00

$10.00

$12.00

$14.00

Ins

Cei

ling

Fur

nace

Ins

Cei

ling

HP

Low

-eF

urna

ce

Low

-e H

P

SEE

R 1

0to

12

Ele

c to

Fue

l DH

W

HP

toF

urna

ce

Flat NG (Original)

TDV Nat Gas

TDV Propane



Oakland Residential Measures

$0.00

$0.50

$1.00

$1.50

$2.00

$2.50

$3.00

$3.50

$4.00

Ins

Cei

ling

Furn

ace

Ins

Cei

ling

HP

R30

to R

38Fu

el H

eat

R30

to R

38H

eat P

ump

Low

-eFu

rnac

e

Low

-e H

P

SEER

10

to12

Elec

to F

uel

DH

W HP

toFu

rnac

e

Flat NG (Original)

TDV Nat Gas

TDV Propane



Residential Conclusions

TDV costing increased the value of all efficiency measures considered

Electricity more expensive when very hot or very cold

Natural gas and propane more expensive in winter than summer

Benefit of switching to fuel less for propane than natural gas



Nonresidential Energy Results

Same energy results from earlier work (1999 Dollar Based Standards project)

6 protoype buildings Typical schedules for each building type

(divergence from ACM rules) DOE-2 model not EnergyPro Hourly energy results multiplied by TDV

energy costs for 8,760 h/yr TDV costs:

15 year PV at 3% real discount rate



Fresno Nonresidential Measures

$(10.00)

$(8.00)

$(6.00)

$(4.00)

$(2.00)

$-

$2.00

$4.00

Offi

ce

Scho

ol

Reta

il

Hosp

ital

Offi

ce

Scho

ol

Reta

il

Hosp

ital

Offi

ce

Scho

ol

Reta

il

Hosp

ital

PV E

nerg

y Sa

ving

s 20

01 $

/SF

Flat NG (original)

TDV Nat Gas

TDV Propane

TES Gas Cooling Electric Heating



Fresno Nonresidential Measures

$-

$0.50

$1.00

$1.50

$2.00

$2.50

$3.00

$3.50

$4.00

$4.50

Offic

e

Scho

ol

Reta

il

Hosp

ital

Offic

e

Scho

ol

Reta

il

Hosp

ital

Offic

e

Scho

ol

Reta

il

Hosp

ital

PV E

nerg

y Sa

vings

200

1 $/

SF

Flat NG (original)

TDV Nat Gas

TDV Propane

Low-e Low LPD Eff. Chiller



Nonresidential Conclusions

Results are dependent on building type TDV results for TES inverse of traditional

flat costing Value of gas cooling is increased Results for heating measures affected by

Fuel type (Nat gas vs. Propane) Greater value for A/C efficiency Lighting LPD valuation sensitive to

schedule (occupancy)



Residential TDV - further work

TDV duct efficiency Refined water heater model SEER to EIR conversion Heat pump sizing - resistance strip

contribution to winter peak Thermostat schedules - especially for heat

pumps



Nonresidential TDV - further work

ACM revisions• Equipment curves• SEER to EIR conversion based on curves• Occupancy specific schedules• Add TES and Gas Cooling• Add Photovoltaics and Solar Heating

Peer review of equipment curves Obtain/develop part load curves Revisit equipment specific curves Occupancy sensors vs time clocks Persistence of measures



TDV Web Page



TDV Web Page

http://www.h-m-g.com/TDV/index.htm Reports

• Dollar-Based Performance Standards (1999)• TDV Summary Report (2000)

Software • ResTDV.xls• NonresTDV.xls

Comment form



Comments/Suggestions

Gary Fernstrom, PG&E(415) [email protected]

Douglas Mahone, HMG(916) [email protected]

copyrighted © 2000 pg&e all rights reserved case initiative project energy analysis review of...

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