CSA C748-13 pdf download – Performance of direct-expansion (D X) ground -source heat pumps.
1.2 Part 1 of this Standard establishes performance testing and rating criteria for factory-made, electrically-driven, mechanical-compression type, DX-to-air heat pumps for residential, commercial and industrial use. The requirements for testing and rating contained in Part 1 of this Standard are based on the use of matched assemblies. 1.3 Part 1 of this Standard does not apply to the testing and rating of individual assemblies for separate use, nor to the testing and rating of heat pumps covered in ISO 5151 or ISO 13253.. Note: In this Standard, the terms “equipment” or“heat pumps” may be used to mean “DX-to-airheat pumps”. 1.4 The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only. 1.5 In CSA Standards, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; “may” is used to express an option or that which is permissible within the limits of the standard; and “can” is used to express possibility or capability. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.
Ground-loop simulation water coil— a ground-loop heat exchanger used in DX heat pumps that is simulated by the application of a refrigerant-to-water heat exchanger used to maintain the condition of the refrigerant to test conditions. Note:The energy calculations normally determined from the outdoorwatercoil are derived by applying the water-enthalpy test method to this coil. Heating capacity— the amount of heat that the equipment can add to the conditioned space in a defined interval of time, in watts (Btu/h), as determined by the specified test methods in this Standard. Latent cooling capacity— the amount of latent heat that the equipment can remove from the conditioned space in a defined interval of time, in watts (British thermal units per hour). Net total cooling capacity— the total cooling capacity with fan power adjustment (see Clause 4.1.3). Net heating capacity— the heating capacity with fan power adjustment (see Clause 4.1.3). Rated frequency— the frequency shown on the nameplate of the equipment, in hertz. Rated voltage— the voltage shown on the nameplate of the equipment, in volts. Sensible cooling capacity— the amount of sensible heat that the equipment can remove from the conditioned space in a defined interval of time, in watts (British thermal units per hour). Standard air— the dry air at 20.0 °C (68°F) and 101.324 kPa (29.92 in Hg), that has a mass density of 1.204 kg/m 3 (0.075 lb/cu.ft). Total cooling capacity— the amount of sensible and latent heat that the equipment can remove from the conditioned space in a defined interval of time, in watts (British thermal units per hour), as determined by the specified test methods.
4 Rating and test conditions 4.1 Rating conditions for the determination of capacity 4.1.1 Standard ratings Standard ratings shall be established at the standard rating conditions specified in Clause 4.2, using the test procedures specified in Clause 6. Standard ratings relating to cooling and heating capacities shall be net values, including the effects of circulating fan heat, but not supplementary heat. Standard efficiency ratings shall be based on the effective power input as defined in Clause 3.11. 4.1.2 Power input of fans for heat pumps without duct connection In the case of heat pumps that are not designed for duct connection, and that are equipped with an integral fan, all power consumed by the fans shall be included in the effective power input to the heat pump.CSA C748-13 pdf download.
