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FRESH AIR FROM HRV TO HOUSE 2. FRESH AIR FROM OUTSIDE TO HRV 3. STALE AIR FROM HOUSE TO HRV 4. STALE AIR FROM HRV TO OUTSIDE A05228 ABCDModelin.mmin.mmin.mmin.mmHRVBBLHA115017-1/4438.210-1/2266.74-1/2114.311279.4HRVBBLHA125017-1/4438.210-1/2266.74-1/2114.311279.4EFGModelin.mmin.mmin.mmHRVBBLHA11507-3/4196.94-3/8111.17-3/4196.9HRVBBLHA12507-3/4196.95-13/16147.67-3/4196.9Fig.1--HRVBBLHAUnitDimensions 5 A05426 Fig. 2 - --HRVBBSHA Unit Dimensions HRV A05425 Fig. 3 - -- HRVBBSVA Unit Dimensions Physical data ModelHRVBBLHA1150HRVBBLHA1250HRVBBSVA1100HRVBBSHA1100PortLocationsSideSideTopSideCoreTypePolypropylenePolypropylenePolypropylenePolypropyleneCoreTypePolypropyleneCrossFlowPolypropyleneCrossFlowPolypropyleneCrossFlowPolypropyleneCrossFlowWeight—lb(kg)65(29.5)73(33.2)4242ShippingWeight—lb(kg)75(34)83(37.6)4848ShippingDimensions(in.) HeightWidthDepth23-1/1636-1/1617-13/1622-15/1635-1/1622-15/1625.517.523.030.015.023.0 6 Physical data (continued) ModelHRVBBLHA1150HRVBBLHA1250HRVBBSVA1100HRVBBSHA1100Capacity—CFM@ 0.5-0.3ESP(in.wc) 130---168191---21099---10799---107Efficiency(Sensible)—Percent65656666Efficiency(Sensible)Percent32_F(0_C) --13_F(--25_C) 6565656066666666Efficiency(Latent)—Percent@alltemperatures0000HeatCoreExchangeArea— cuft(cum)120(3.4)166(4.7)55(5.1)55(5.1) ModelHRVBBLHA1150HRVBBLHA1250HRVBBSVA1100HRVBBSHA1100Voltage120120120120MaxPower—watts150218150150MaxAmps1.41.91.31.3 HEATING LOAD BTU Methods to Size HRVs Method 1: 1. Calculate cubic feet of occupied space 2. Multiply by recommended air changes per hour (AC/h) 3. Divide by 60 minutes per hour to convert to CFM Example: 2000 sq ft with 8 ft ceiling 0.35 air changes per hour (AC/h) (2000 sq ft x 8 ft ceiling x 0.35 AC/h) / 60 min/h = 93.3 CFM Method 2: 1. Multiply number of people times 15 CFM/person 2,322 2. Multiply number of bathrooms times 20 CFM/each OutsideTemp°FHeat Load (BTUh) @ Inside Design Temp 72°FHRVBBLHA1150 –25 4,688 –20 4,466 –15 4,598 –10 4,334 –5 4,069 0 3,805 5 3,541 10 3,502 15 3,220 20 2,938 25 2,950 30 2,636 3540 2,009 3. Add25CFM for kitchen The heating load chart shows the heating loads in BTUh for a range of winter design temperatures for each model of ventilator. Example: 2 people EXAMPLE: The heating design temperature for Milwaukee, 2 bathrooms WI, is - --4_F.At - --5_F, the additional heating load of the 1 kitchen HRVBBLHA1250 is 8417 BTUh. This additional load should be taken into consideration when sizing the heating equipment. (2 x 15) + (2 x 20) + 25 = 95 CFM Additional heating and cooling load charts Although the ventilators process the outside air before it enters the home, additional heating and cooling loads need to be considered. 7 COOLING LOAD BTU OutsideCoolingLoad(BTUh)@InsideDesignTemp75°Fand50%RelativeHumidityOutsideEnthalpyBTU/lbHRVBBLHA1150HRVBBLHA1250306701,071311,0901,741321,5092,411331,9283,080342,3473,750352,7664,419363,1855,089373,6045,759384,0236,428394,4427,098404,8617,767415,28042HRV 8,437 5,699 9,107 The cooling load chart shows the loads in BTUh also. To use the cooling load chart, first find the design enthalpy from a psychrometric chart using the design dry bulb and wet bulb temperatures. (See following psychrometric chart.) The cooling load can then be found for a range of enthalpies for each ventilator. EXAMPLE: The cooling design dry bulb temperature for Milwaukee, WI, is 87_F and the average wet bulb at that temperature is 73_F. On the psychrometric chart the enthalpy is about 37.7 BTU/lb of dry air which will round up to 38 BTU/lb of dry air. In the left column, at 38 BTU/lb the HRVBBLHA1250 would have an additional cooling load of 6428 BTUh. This additional load should be taken into account when sizing the air cooling equipment. 8 Psychrometricchart.025.024.023.022.021.020.019.018.017.016.015.014.013.012 .95.90.85.80.75.70.65.60.55.50.45.40.35 .011.010.009.008.007.006.005.004.003.002.0010 Sensibleheatfactor Pounds of moistureper pound of dry air 7 8 9 10 11 12 32 33 34 35 36 37 38 39 40 41 42 43 44 45 47 48 49 46 27 28 29 30 31 19 20 21 22 23 24 25 26 12 13 14 15 16 17 1...

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