Selection Procedure HOT Water Application, Drop | Burnham BH, BV

G.SELECTION PROCEDURE - HOT WATER APPLICATION

Example 1:

GIVEN DESIGN CONDITIONS:

Unit Heater Model: BV-59, Entering Water Temperature: 250°F, Entering Air Temperature: 70°F

APPLICATION PROCEDURE:

1.	Capacity:	BtuA= BtuS x Heating Capacity Factor		The standard capacity of an BV-59 is
		=44,300 x 1.272 = 56,350 Btu/hr		44,300 Btu/hr from Table 9.
				Steam heating capacity conversion factor
				for given circumstance is1.272 from Table 11.
2. Water Flow Rate:		Same as standard		The standard capacity on BV-59 is based upon a
				water flow rateof 4.5 GPM, from Table 9.
3.	Final Air	FATA = EATA + [(460 + EATA) /		The standard airflow of an BV-59 is 1150 CFM,
	Temperature:	(576 x CfmS) / BtuA -1)]		from Table 9.
		FATA = 70°F + [(460 + 70) /
		(576 x 1150) / 56,350-1)] = 119°F
4. Max. Mounting		WTDA = BtuA / (480 x GA) = 56,350 /		The standard capacity on BV-59 is based upon a
	Height:	(480 x 4.5) = 26.09°F		water flow rate of 4.5 GPM, from Table 9.
				The max. mounting height at standard condition
5. Max. Mounting		MMHA = MMHS x Correction Factor		is 14 feet, from Table 9.
	Height:	= 14 feet x 0.86 = 12.0 feet		The mounting height correction factor is
				0.86 from Table 14.

Example 2:

GIVEN DESIGN CONDITIONS:

Horizontal Air Delivery requested, Heating Load: 120,000 Btu/hr, Entering Air Temp.: 50°F, Entering Water Temp.: 180°F

APPLICATION PROCEDURE:

1.	Unit Selection:	BtuS= BtuA x Heating Capacity Factor		Hot Water heating capacity conversion factor for
		=120,000 / 0.940 = 127,660 Btu/hr		given circumstance is 0.940 from Table 11.
		(at standard conditions). Select BH-165.
2.	Actual Heating	The capacity of an BH-165 at actual		Hot Water heating capacity conversion factor for
	Capacity:	conditions will be BtuA = BtuX x Heating		given circumstance is 0.940 from Table 11.
		Capacity Factor = 133,000 x 0.940 =
		125,020 Btu/hr
3.	Final Air	FATA = EATA + [(460 + EATA) x (BtuA)/		Cfm for given circumstance is 2500 from
	Temperature:	(576 x CfmS)] = 50 x [(460 + 50 x		Table 9.
		(125,020) / (576 x 2500)] = 94°F
4. Water Temperature		WTDA = BtuA / (480 x GPMA)		GPMA for given circumstance is 13.3 from
	Drop:	= 125,020 / (480 x 13.3) = 19.5°F		Table 9.
5.	Max. Mounting	MMHA = MMHS x Correction Factor		The mounting height correction factor is 1.08
	Height:	= 18 x 1.08 = 19.4 feet		from Table 14.

18

Image 18

Burnham BH Selection Procedure HOT Water Application, Water Flow Rate, 125,020 Btu/hr Final Air, Water Temperature, Drop

Contents

BH and BV Unit Heaters 8144A001R4-2/07 Table of Contents Important Information Read Carefully Before Installation III. Installation II. General Information Wiring Instructions Unit Heater Mounting Height 115V / 60Hz / 1PH Wiring Schematic Recommended Maximum Mounting Height Hot Water System Piping IV. Operation Prior to OperationInitial START-UP Motors MaintenanceInspect Regularly Casings Typical BH Unit Arrangement Sound Class Ratings VI. Application GuidelinesGeneral Guidelines Large Factories, Fabrication Shops Steam Performance Data Steam Performance Data -- High Motor SpeedSteam Performance Data -- Reduced Motor Speed Selection Procedure Steam Application Application ProcedureGiven Design Conditions Steam Calculation Formulas Fata = Eata + Atra Unit Entering Steam Correction FactorsSteam Heating Capacity Conversion Factors Heater Air Temp Types 100 125 150 Steam Pressure Psig Air Temperature Rise Conversion FactorsSteam Unit Heater Mounting Height Correction Factors Correction Factor Properties of Steam Gauge Temp Latent HeatBtu/lb Hot Water Performance Data -- High Motor Speed Hot Water Performance Data -- Reduced Motor Speed Water Flow Rate Selection Procedure HOT Water ApplicationWater Temperature 125,020 Btu/hr Final Air HOT Water Calculation Formulas BtuAG = BtuS or BtuA x Glycol Correction Factor Ethylene Glycol Correction Factors HOT Water Correction FactorsHot Water Heating Capacity Conversion Factors Hot Water Unit Heater Mounting Height Correction Factors Field Installed Options for Horizontal Models only VII. OPTIONS, Accessories and Control SequencesField Installed Options for Horizontal and Vertical Models Control Sequences Field Installed Options for Vertical Models only Description Vertical Air Outlet Accessory Dimensions Vertical Air Outlet Accessory Maximum Height and Spread123 Cone-JetLou Truncone No Deﬂector Anemo VIII. Dimensional Data BH Dimensional DataModel BH Dimensions BV Dimensional Data Model BV DimensionsMale NPT Fan Ship Model IX. Motor Data Motor/Power CodesMotor/Power Description Code Voltage and Motor Type Limited Warranty