## Commercial Air Conditioners and Heat Pumps 

# Screening Analysis David Winiarski (david.winiarski@pnl. gov) 

## Pacific Northwest National Laboratory U.S. DOE Workshop on Standards for Commercial Air Conditioners and Heat Pumps September 12, 2001 

## Commercial Air**Condition~rs** 

## and Heat Pumps 

# Screening Analysis David Winiarski (david.winiarski@pnl.gov) 

## Pacific Northwest National Laboratory 

# u.s. DOE Workshop on Standards for Commercial Air Conditioners and Heat Pumps September 12, 2001

### -g 

### Screening Analysis Overview The Screening Analysis is used to eliminate from further analysis those options or efficiency levels that are not sufficiently developed or have characteristics that make them technologically unsuitable for consideration in the rulemaking. Finaldesignoptions includedmustsatisfy the following criteria. Technological feasibility Practicability to manufacture, install, and service Impacts on health or safety Impacts on product utility or availability

II1-C- 2 Screening Analysis 

### Overview

'" .' : I'
. ,. f:>**'~~'.** ,0 ! # 

### The Screening Analysis is used to eliminate from further analysis those options or efficiency levels that are not

.sufficiently developed or have characteristics that make them

technologically unsuitable for consideration in the rulemaking. Final design options includedmustsatisfy thefollowing criteria: Technological feasibility Practicability to manufacture, install, and service Impacts on healt,h or safety Impacts on product utility or availability

UI-C- 2

# ZN Screening Analysis 

## Do1 DOE Requests for Stakeholder Input Should the Department considerother factors in developing its list ofpotentialdesign options? For example, shouldincreases inEER be limitedby the latentheat removal capability ofthe equipment in order to make the productsuitable for high humidityareas ofthe country? What assumptions shouldthe Department make regarding design forspecific capacities ofequipment? Howshould the Department address capacitycontrol measures? Are there othertechnologychoices thatshouldbe added to those listedin the framework document
III-C- 3 , ' 

### Screening Analysis'



### . 

### DOE Requests for Stakeholder Input

"., .. ,". • Should.the Departmentconsiderotherfactors in developing its list ofpotential design options? For example, shouldincreases in EER be limited by the latent heat removal capability ofthe**eq~ipment** 

### in orderto make 

### the productsuitable for high humidityareas ofthe country?
.• What assumptions should the Department make regarding

,. design forspecific capacities ofequipment? Howshould the

., Departmentaddress capacitycontrol measures?
• Are there othertechnologychoices thatshouldbe added to those lis'ted in the framework document

III-C- 3ft



# BACKUP SLIDES Screening Analysis

III-C- 4 

# BACKUP SLIDES

Screening Analysis

, ,

III-C· 4

### ' . Screening Analysis Initial Technology Choice Considerations Evaporator and condenser coils with * Air-foil or backward-curved larger heat-exchanger area * centrifugal fans * 'o "Deep coil" or micro-channel * Synchronous (toothed) belts or evaporator coils coils direct drive fans * * Inverter-driven, variable-speed

· Low pressure-loss filters and Low pressur s findoor or condenser compressors cooling coils c High-efficiency propeller condenser * High efficiency motors * fans * High efficiency compressors, e.g. * High-side solenoid valve or scrolls or "twin-single" technology * discharge line check-valve to '.' Multiple compressors * minimize pressure equalization * Inverter-driven, variable-speed * Heat-pipes (for high latent loads)* compressors* * Double-skin, high-albedo cabinets* * Thermal expansion valves (TXV) * Sub-coolers

· Electronic expansion valves Demand-controlled ventilation strategy * * Currently used in commercial unitaryand/or splitAC/HP products III-C- 5 Screening Analysis Initial Technology Choice Considerations


### • Evaporator and condenser coils with 

## • Air-foil or backward-curved larger**heat~exchanger** area * centrifugal fans * CJ) "Deep coil" or micro-channel 

### • Synchronous (toothed) belts or evaporator coils direct drive fans * Low pressure-loss filters and 

### • Inverter-driven, variable-speed 

## • cooling coils * indoor or condenser compressors 

### • High-efficiency propeller condenser 

## • High efficiency motors * fans 

# • High efficiency compressors, e.g. 

## • High-side solenoid valve or scrolls or "twin-single" technology * discharge line check-valve to '

# .. Multiple compressors * minimize pressure equalization 

## • Inverter-driven! variable-speed 

### • Heat-pipes (for high latent loads) * compressors * 

### • Double-skin, high-albedo cabinets * 

### • Thermal expansion valves (TXV) * 

### • Sub-coolers 

## • Electronic expansion valves 

### • Demand-controlled ventilation strategy * * Currently used in commercial unitary and/or split AC/HP products III-C- 5