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ASHRAE Standard

206-2013

Method of Testing for Rating of Multi-Purpose Heat Pumps for Residential Space Conditioning and Water Heating

Wayne Reedy Oak Ridge National Laboratory

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BACKGROUND

• Development of standard was supported by ORNL as part of the U.S. Department of Energy’s effort to facilitate market penetration of multifunction heat pumps.

• In order to achieve an instantly recognizable, authoritative document, a test standard was requested of ASHRAE, which in turn established a Standard Project Committee to develop Standard 206

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206 applies to electrically powered unitary

heat pump equipment that provides both

space conditioning and water heating

functions, and may include other

functions, such as dehumidification and/or

ventilation.

SCOPE

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• 206 addresses air-source, water-source, ground water-source, ground-source closed loop, and direct geoexchange equipment.

• It applies to air-source equipment rated below 65,000 Btu/h [19,000 W], and water-source, ground water-source, ground-source closed loop, and direct geoexchange equipment rated below 135,000 Btu/h [40,000 W].

SCOPE

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• 206 addresses single-capacity, dual-

capacity, and variable-capacity equipment

• Provides for up to 7 modes of equipment

operation

o Space conditioning only

o Dedicated water heating

o Dehumidification+space conditioning

o Dehumidification

o Space conditioning+water heating

o Dehumidification+space

conditioning+water heating

o Dehumidification+water heating

SCOPE

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• Space conditioning may be heating or

cooling

• Dehumidification may be during

summer or winter

• Dedicated water heating may be during

summer or winter, with the heat source

being either indoor or outdoor

SCOPE

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• Test procedure covers packaged, split, mini-

split, and triple split equipment configurations

• Refrigerant-to-water HX may be internal or

external to a heat pump section or water

storage tank

• Specifies refrigerant and water line

lengths/configuration for all options

SCOPE

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• ANSI/ASHRAE Standard 37Methods of Testing for Rating Electrically Driven Unitary Air-

Conditioning and Heat Pump Equipment (Steady-State Performance)

• ANSI/ASHRAE Standard 116Methods of Testing for Rating Seasonal Efficiency of Unitary Air

Conditioners and Heat Pumps

STANDARD 206 IS AN EXTENSION

OF AND CONSISTENT WITH:

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• AHRI Standard 210/240 Standard for Unitary Air-Conditioning and Air-Source Heat Pump

Equipment

• ANSI/AHRI/ASHRAE ISO Standard 13256-1Water-source heat pumps - testing and rating for performance -

Part 1: Water-to-air and brine-to-air heat pumps

• AHRI Standard 870Standard for Performance Rating of Direct GeoExchange Heat Pumps

• ANSI/ASHRAE Standard 118.2Method of Testing for Rating Residential Water Heaters

STANDARD 206 IS ALSO CONSISTENT

WITH:

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ANSI/ASHRAE Standard 137Methods of Testing for Efficiency of Space-Conditioning/Water-

Heating Appliances that Include a Desuperheater Water Heater

and

various waivers from DOE’s Central Air

Conditioner and Central Air Conditioning Heat

Pump Test Procedure

STANDARD 206 SHOULD

REPLACE:

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• Committee was made up of 15 voting

members, representing manufactures,

testing laboratories, electric utilities, and a

university; AHRI was a non-voting member.

SPC 206 INCLUDED

REPRESENTATION FROM ALL

INDUSTRY SEGMENTS

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• Water heating load

• Space latent load

• Space sensible load

CALCULATION PROCEDURE IS

A BIN PROCESS BASED ON:

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206 space cooling design load follows

Standard 116 in setting the total space

cooling load for 10% oversizing relative to

actual unit total capacity at 95°F test point

206 then applies a 0.76 sensible heat factor

to determine the space design sensible

cooling load

SPACE SENSIBLE LOAD

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The latent cooling load for the combined

appliance in Standard 206 is made up of an

internal latent gain and a ventilation latent gain.

SPACE LATENT LOAD

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• The water heating load is assumed evenly

distributed over the hours of the year.

• The hot water usage is taken as 243.4

liters/day (64.3 gallons/day) from ASHRAE

118.2-20064, which is the test standard for

standalone residential water heaters.

• Using inlet and outlet water temperatures

from ASHRAE 118.2-20064 of 14.2°C (58°F)

and 57.2°C (135°F) respectively and a water

heater energy factor of 0.90 yields an hourly

water heating load of 496.9 W (1696 Btu/h).

WATER HEATING LOAD

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• Three performance descriptors are used to

completely describe the performance of the

combined appliance:

o Combined appliance space conditioning

performance for the cooling season;

o Combined appliance space conditioning

performance for the heating season;

o Combined appliance water heating

performance on an annual basis.

• In all cases, the descriptor ends in a subscript

“ca” to designate “combined appliance”.

PERFORMANCE DESCRIPTORS

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• Air-source equipment

o SEERca

o HSPFca

o EFwca

• Water-source equipment

o EERca

o COPca

o EFwca

PERFORMANCE DESCRIPTORS

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• Approved as an ASHRAE standard

6/26/2013

• Available from ASHRAE in paper or

electronic form

• Includes an excel spreadsheet to

perform calculations

STATUS:

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QUESTIONS

COMMENTS