ASHRAE 137 2013

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ASHRAE Standard 137-2013 Methods of Testing for Efficiency of Space-Conditioning/Water Heating Appliances that Include a Desuperheater Water Heater (BSR/ASHRAE/ANSI Approved)

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ASHRAE	2013	48

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ANSI/ASHRAE Standard 137-2013 provides test methods and calculation procedures for establishing the efficiencies of space-conditioning/water-heating appliances that have refrigerant-to-water desuperheaters.

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4	FOREWORD 1. PURPOSE 1.1 This standard provides test methods and calculation procedures for establishing the efficiencies of space-conditioning/water-heating appliances having refrigerant-to- water desuperheaters. 1.2 The procedures may be used as a basis for establishing efficiency ratings for such equipment and for estimating annual energy consumption. 2. SCOPE 3. DEFINITIONS
5	4. NOMENCLATURE
9	5. CLASSIFICATIONS 6. REQUIREMENTS 6.1 Seasonal Energy Efficiency Ratio (SEER). The SEER of the combined appliance shall be determined from the tests and the calculation procedure described in ANSI/ASHRAE Standard 116, Methods of Testing for Rating Seasonal Efficiency of Unitary Air C… 6.2 Heating Seasonal Performance Factor (HSPF). The HSPF of the combined appliance shall be determined from the tests and the calculation procedure described in ANSI/ASHRAE Standard 116,1 supplemented by the additional provisions of Sections 7 throug… 6.3 Energy Factor (EF). The energy factor of the electric water heater shall be determined in accordance with ANSI/ASHRAE Standard 118.2, Method of Testing for Rating Residential Water Heaters.2 6.4 Combined Space-Conditioning and Water-Heating Performance. For each season, the space-conditioning and water-heating performance of the combined appliance shall be determined using the calculations prescribed in Section 11. 7. INSTRUMENTATION SPECIFICATIONS 7.1 Temperature Measurements TABLE 1 Component Assemblies Constituting a Combined Appliance 7.2 Pressure Measurements 7.3 Airflow Measurements 7.4 Electrical Power, Energy, and Voltage Measurements
10	7.5 Desuperheater Water Flow Rate. For active systems that are tested using Type A water-heating-mode tests, the water flow rate through the desuperheater shall be measured using a flowmeter. The flow rate measurement () shall be accurate to within 7.6 Water Mass or Volume Measurements. During the simulated-use test and Type B water-heating-mode tests, either the mass or volume of the water withdrawn from the water heater is measured. If a mass measurement is used, the scale shall be accurate t… 7.7 Time Measurements. The elapsed time measurements shall be made using an instrument that is accurate to within ±0.3% of the reading. 8. APPARATUS 8.1 Test Apparatus
11	8.2 Standard Components. If the manufacturer neither supplies nor specifies the heat pump (air conditioner), water heater, or water pump (if required), then components meeting the criteria listed below shall be used for testing. Figure 1 Physical specifications required of the standard water heater.
12	8.3 Installation of the Appliance and Instrumentation TABLE 2 Water Pump Specification Limits
13	Figure 2 Default installation requirements for field- installed desuperheaters: (a) passive systems and (b) insert systems.
14	Figure 3 Examples of acceptable instrumentation locations and piping arrangements for water heater inlet and outlet.
15	Figure 3 (cont.) Examples of acceptable instrumentation locations and piping arrangements for water heater inlet and outlet.
16	Figure 4 Location of internal tank temperature sensors. Figure 5 Default water piping connections at water heater: (a) fixed-flow active systems and (b) variable- flow active systems.
18	Figure 6a Acceptable test setup for water-heating-mode tests conducted using Type A water-heating-mode test method: water heater and desuperheater are not packaged. Figure 6b Acceptable test setup for water-heating- mode tests conducted using Type A water-heating-mode test method: water heater and desuperheater are packaged.
19	8.4 Test Setup
20	9. METHODS OF TEST 9.1 Primary Test Methods 9.2 Secondary Test Methods
22	10. TEST PROCEDURE 10.1 General 10.2 Test Requirements and Test Conditions 10.3 Tests Tolerances and Energy Balance Requirements
23	TABLE 3a Summary of Laboratory Tests and Test Conditions Associated with the Space-Cooling Season TABLE 3b Summary of Laboratory Tests and Test Conditions Associated with the Space-Heating Season 10.4 Water Heater Volume Determination. The volume of the water heater Vt shall be determined either via a direct volume measurement or two mass measurements. If using the latter approach, the mass of the water heater shall be measured when empty and… 10.5 Simulated-Use Test
24	TABLE 4a Test Tolerances for the Simulated-Use Test TABLE 4b Test Tolerances for Type A Water-Heating-Mode Tests
25	TABLE 4c Test Tolerances for Type B Water-Heating-Mode Tests
28	10.6 Space-Conditioning-Only-Mode Tests. The space-conditioning-only tests shall be conducted with the desuperheater and water heater installed in accordance with Section 8.3 and filled with water. For active systems, the water pump shall be disabled… 10.7 Water-Heating-Mode Tests (COOL&WH and HEAT&WH). For water-heating-mode tests, space- conditioning capacity and electrical power shall be determined using the same test apparatus and, except for very few additions, the same test procedures as use…
30	TABLE 5 Suggested Initial Target Temperatures When Conducting Type B Water-Heating-Mode Tests
32	11. CALCULATIONS 11.1 Seasonal Energy Efficiency Ratio (SEER) of the Combined Appliance When Used Only for Space Cooling. The SEER of the combined appliance shall be calculated as described in ANSI/ASHRAE Standard 116.1 The space-cooling capacities and electrical pow… 11.2 Heating Seasonal Performance Factors (HSPF) of the Combined Appliance When Used Only for Space Heating. An HSPF of the combined appliance shall be calculated as described in ANSI/ASHRAE Standard 116.1 The space-heating capacities and electrical … 11.3 Combined Performance Factor for the Space- Cooling and Water-Heating Season (CPFcs ). The combined performance factor for the space-cooling and water-heating season shall be calculated as follows:
33	TABLE 6 Fractional Bin Hours for Space-Cooling and Water-Heating Seasonal Calculations TABLE 7 Standby Losses of an Electric Water Heater as a Function of Its Energy Factor
34	11.4 Combined Performance Factor for the Space- Heating and Water-Heating Season CPFhs. The combined performance factor for the space-heating and water-heating season shall be calculated as follows:
35	Figure 7 Map of the generalized climatic regions.
36	TABLE 8 Fractional Bin Hours and Outdoor Design Temperatures, by Region, for Space-Heating and Water-Heating Seasonal Calculations
39	11.5 Combined Performance Factor for the Water- Heating-Only Season (CPFws ). For all combined appliances that incorporate a desuperheater, the combined performance factor for the water-heating-only season equals the energy factor of the water heater… 12. REFERENCES Informative Annex A— Seasonal and Annual Energy Consumption and Operating Costs for the Combined Appliance A1. For the Space-Cooling and Water-Heating Season
40	TABLE A1 Seasonal Operating Hours for Each Climatic Region A2. For the Space-Heating and Water-Heating Season A3. For the Water-Heating-Only Season
41	A4. Annual Energy Consumption and Operating Cost Informative Annex B— Seasonal and Annual Energy Consumption and Operating Costs for the Separate Heat Pump (or Air Conditioner) and Electric Water Heater of the Combined Appliance B1. For the Space-Cooling and Water-Heating Season B2. For the Space-Heating and Water-Heating Season
42	B3. For the Water-Heating-Only Season B4. Annual Energy Consumption and Operating Cost Informative Annex C— Seasonal and Annual Energy and Cost Credits for the Combined Appliance C1. For the Space-Cooling and Water-Heating Season C2. For the Space-Heating and Water-Heating Season C3. For the Water-Heating-Only Season C4. Annual Energy and Cost Credits
43	Informative Annex D— Calculation of an Equivalent Seasonal Energy Efficiency Ratio and an Equivalent Heating Seasonal Performance Factor or an Equivalent Energy Factor D1. Limitations D2. Equivalent Seasonal Energy Efficiency Ratio D3. Equivalent Heating Seasonal Performance Factor
44	D4. Equivalent Energy Factor D4.1 Heat Pump with Desuperheater Water Heater. The combined appliance provides the same energy consumption for space conditioning and water heating during the year as separate appliances consisting of a water heater having a water-heating EF that is… D4.2 Air Conditioner with Desuperheater Water Heater. The combined appliance provides the same energy consumption for space cooling and water heating during the year as separate appliances consisting of a water heater having a water-heating EF that i…
45	Informative Annex E— Determination of Seasonal Combined Performance Factors for Installations Using a Separate Heat Pump (Air Conditioner) and an Electric Water Heater E1. For the Space-Cooling and Water-Heating Season E2. For the Space-Heating and Water-Heating Season E3. For the Water-Heating-Only Season

Additional information

Standard Title	ASHRAE Standard 137-2013 Methods of Testing for Efficiency of Space-Conditioning/Water Heating Appliances that Include a Desuperheater Water Heater (BSR/ASHRAE/ANSI Approved)
Published Code	ASHRAE
Publication Date	2013
Pages Count	48

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