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18、ording of the proposed change; and(d) rationale for the change. 2012 CSA GroupTest method for measuring efficiency andpressure loss of drain water heat recovery unitsJuly 2012 1B55.1-12Test method for measuring efficiency and pressure loss of drain water heat recovery units1Scope1.1This Standard spe
19、cifies requirements for measuring the heat recovery efficiency and pressure loss for vertically installed, falling-film drain water heat recovery (DWHR) units.1.2This Standard applies to DWHR units(a)of any diameter and length;(b) with a configuration where potable water and drain water flow rate is
20、 equal; and(c) with a flow rate range of 5.5 to 14 L/min.1.3In this Standard, “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;
21、and “may” is used to express an option or that which is permissible within the limits of the standard.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
22、 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 (nonmandatory) to define their application.2 Reference publicationThis Standard refers to the following publication, and where such referen
23、ce is made, it shall be to the edition listed below, including all amendments published thereto.NRCan (Natural Resources Canada)Testing Method for Measuring Efficiency of Drain Water Heat Recovery Units (2008)3 DefinitionsThe following definitions shall apply in this Standard:Drain water heat recove
24、ry (DWHR) unit a double-wall, vented falling-film heat exchanger with a visible means of leak detection designed to transfer heat from drain water to potable water.Note: “Double-wall” implies having two distinct tubes separating the drain water from the potable water.DWHR series a set of DWHR models
25、 from a given manufacturer that have identical diameter and coil configuration and only vary by overall length.B55.1-12 2012 CSA Group2 July 2012Heat exchanger effectiveness and heat exchanger efficiency the ratio between the actual heat transfer and the theoretical maximum possible heat transfer.No
26、te: For the purpose of this Standard, the terms “heat exchanger effectiveness” and “heat exchanger efficiency” are interchangeable.Standard reporting condition the operating conditions for which each DWHR model must be reported and labelled.Note: See Table2.Steady state test condition the stabilized
27、 condition during tests wherein the measured values of all flow rates, temperatures, and inlet temperature difference do not vary by more than the tolerances indicated in Table 1 over three sets of measurements that are taken at least 1 min apart.Test point a set of physical observations that charac
28、terize the steady state condition of a DWHR unit at one of several prescribed flow rates.Note: The observations include the measurements of flow rate, prescribed temperatures, inlet pressure, and outlet pressure.4 General requirementsThe DWHR unit testing apparatus shall provide a repeatable set of
29、conditions under which the performance of DWHR units can be reliably measured.5Testing5.1 GeneralTest instruments shall be in good working order and properly calibrated. Calibration records shall be kept and shall specify, at a minimum, the date of calibration, method of calibration, and the referen
30、ce standard used. See Annex B.Note: Instruments should be calibrated at least as often as recommended by the manufacturer.5.2 Heat recovery efficiency Procedure5.2.1Each test point shall be recorded when the apparatus has reached the steady state test condition. Note: Flow rate and mass of the DWHR
31、unit being tested will affect the time required to reach the steady state test condition.5.2.2Tests shall be performed at the nominal flow rates of 5.5, 7, 9, 10, 12, and 14 0.2 L/min. Each of these flow rates is referred to as a “test point”.5.2.3Potable water entering the DWHR unit shall be contro
32、lled to 12 5 C. Water entering the drain shall be controlled such that the temperature is 28 1 C above the potable water temperature.5.2.4A single supply of potable water shall be connected to the DWHR unit inlet. The same heated potable water flow shall be directed to the water heater and cold side
33、 of the mixing valve to ensure that it wholly and only supplies the drain water flow. Note: This ensures that both the potable water and drain water sides of the DWHR units receive equal water flow. 2012 CSA GroupTest method for measuring efficiency andpressure loss of drain water heat recovery unit
34、sJuly 2012 35.2.55.2.5.1The upstream drain pipe to the DWHR unit shall(a) use the same nominal size (diameter) as the DWHR unit at the transition point into the DWHR unit; and(b) be smooth to reduce disruption in the water film flow at the inlet to the DWHR unit.5.2.5.2The downstream drain pipe of t
35、he testing apparatus shall be a minimum of 2 in NPS throughout its length.5.2.6The drain water shall be made to flow into a type of trap both prior to falling vertical and after the DWHR unit. An immersion temperature sensor shall then be installed into the immersed section of each trap to enable ac
36、curate measurement of the drain water inlet and outlet temperatures. The traps shall be insulated to be a minimum RSI of 0.5 m2K/W.Note: RSI is an industry accepted standard for the “R-value” of insulation in SI units.5.3 Heat exchanger efficiencyThe heat exchanger efficiency shall be defined aswher
37、e = heat exchanger efficiency, %Tco= potable water outlet temperature, CTci = potable water inlet temperature, CThi= drain water inlet temperature, CNotes: (1) The condition is such that the flow rate of both the potable water and the drain water is equal. The specific heat of water is assumed to be
38、 constant over the entire allowable test temperature range.(2) This equation is derived from the heat exchanger effectiveness formula (see AnnexC).(3) It is not required to test every DWHR model within a given DWHR series because models within a given DWHR series only vary by length. The reported DW
39、HRs efficiency for non-tested models may be determined by interpolation using quadratic curves fits for efficiency versus length and pressure loss versus length. Each curve fit requires a minimum of four tested DWHR models within a DWHR series, calculated in accordance with Clause5.6.4 under standar
40、d reporting.5.4 Pressure lossNote: As an alternative to testing each length of a given DWHR model, an interpolation method can be used to determine the DWHR units pressure loss. This method only applies to models with identical characteristics (diameters and coil configurations), for which only the
41、length varies. The interpolation is made using a quadratic curve fits for pressure loss versus length. Each curve fit requires a minimum of 4 data points calculated in accordance with Clause5.6.4 under standard reporting condition of 9.5 L/min. The maximum length difference between a given interpola
42、ted point and the closest data point should be not more than 500 mm.One of the following options may be used for the location of pressure gauges:(a)Stationary on the test apparatus: (i) The pressure gauges shall be kept stationary in permanent positions on the test rig. (ii) A “short circuit” calibr
43、ation curve for the test rig pressure loss without the existence of a DHWR unit shall be developed and reported with each test report. This calibration curve shall be based upon the series of test points described in Clause 5.2.2 and shall be included in the test report. It is understood that any di
44、fference in static pressure head is also automatically included in this e =()()TTTTco cihi ci100B55.1-12 2012 CSA Group4 July 2012calibration if the pressure gauges are to be fixed in their location, regardless of the DWHR unit being tested. If there is any change in location of pressure gauges, a n
45、ew calibration curve shall be developed and subsequently reported.(iii) For each test point, the pressure read by each pressure gauge shall be recorded. The difference between the pressure gauges, less the “calibration pressure loss” at that flow rate, shall be reported as the pressure loss at that
46、test point.(b) At inlet and outlet of DWHR unit: (i) The pressure gauges shall be located immediately at the inlet and outlet of the DWHR unit being tested. (ii) With the system filled with potable water and under supply pressure, the pressure reading of each gauge shall be recorded. The difference
47、between these readings is the “static pressure difference”. (iii) The static pressure difference in Item (ii) shall be subtracted from the pressure loss test results for each test point.5.5 Test durationFinal data at each test point shall be recorded once the steady state test condition has been rea
48、ched as defined in Clause 3. The key data collected shall include water flow rate, inlet and outlet potable water temperatures, inlet and outlet drain water temperatures, and pressure gauge readings.5.6 Calculations5.6.1The DWHR heat exchanger efficiency shall be determined for each test point using
49、 the equation in Clause 5.3.5.6.2Pressure loss on the potable water side of the DWHR unit shall be calculated in accordance with Clause 5.4.5.6.3Once all test points are undertaken and both efficiency and pressure loss calculated, two quadratic curve fits shall be determined and reported: one for efficiency versus flow rate and another for pressure loss versus flow rate. Opti
