Heat Pump Program Evaluation

1
Heat Pump Program Evaluation

• Baseline Practice and Conditions

2
Evaluation and Review

• Three proposed studies
• Current practice specification and installation
• Program evaluation
• CRD program heat pumps
• ConAug program heat pumps
• Residential Baseline
• New Residential Construction
• Heating systems
• Cooling saturation

3
Study 1 Goals, Specifications

• Sizing Determinants
• House Size
• Climate, Local Practice
• Duct losses
• Thermostat Specification
• Adaptive Recovery
• Auxiliary Element Staging
• Outdoor Temperature Sensor
• Duct design and Airflow
• Duct sizing
• Air flow at coil (CFM/ton)
• Fan sizing and fan speed
• ECM and other variable flow

4
Study 1 Goals, Installation Practice

• Control design
• Element staging
• Low ambient cut-out
• Outdoor temperature
• Defrost control and set-up
• Duct Design
• Leakage
• Heat loss
• Practice and Impact of Correct Charge and Air
  Flow

5
Study 1 Sampling

• Contractor Interviews
• Three or four markets
• Five contactor interviews each
• Detailed Field Review
• About 20 homes recruited to represent contractor
  practice
• Detailed assessment
• Short Term Metering
• Baseline Field Review
• 200 homes in four markets

6
Methodologies

• Detailed interview
• Structured
• Informed interviewer
• Detailed review of Heat Pumps
• Charge and air flow
• Control and set-up
• Defrost
• Thermostat behavior
• Occupant
• Programming
• COP assessment
• Duct system design and performance
• Short Term Metering (Heating Season)

7
Methodologies (cont)

• General Field Review
• House size
• Blower Door/Duct Blaster
• Thermostat assessment
• HP assessment
• Size
• Make and model
• Occupant Survey
• Billing Release

8
Study 2 Goals

• Impact of heat pump conversions
• Impact of heat pump upgrages
• Evaluate impact of PTCS standards
• Assess installation practices for a sample of
  program
• Duct leakage and heat loss
• Charge and air flow
• Thermostat and control strategies

9
Study 2 Billing Analysis

• Conduct billing analysis on all available
  installations (2000 homes)
• Sample in EWEB area
• Checkme! participants (400 homes)
• Control group (200 Homes from Study 1)
• Collect bills from comparable billing periods
  Before and after measure installation
• Heating season evaluation

10
Study2 Field Review

• Conduct detailed review in 6 utility territories
• Conduct field review on 40 homes each
• Use field protocol from Study 1
• Link study homes to CRD specifications

11
Study 3 Goals

• Size
• Distribution of heating systems
• Saturation of cooling systems
• Window area and specifications
• Insulation, code compliance
• Duct and shell tightness

12
Baseline Residential Survey

• Sample to assess current new construction
  practice (100 homes per state)
• Sample at Building Department level
• Target homes occupied in previous year
• Baseline review
• Fuel selection
• Heating and cooling system
• Vintage
• Insulation and Heat Loss
• Duct location
• One to Two Hour protocol