ASHRAE-90.1-2022- - Page 383

Extracted Content

Table L2.2.3 Proposed Building HVAC System Parameters (Continued)

Category	Parameter	Fixed or User Defined	Required	Applicable Systems a
Condenser Loop	Condenser water-pump power, W/gpm	User defined	Pump input, W/gpm; condenser water flow	6, 7, 8, 10, 11, 12
Condenser Loop	Condenser water-pump control	Fixed	Constant-speed, one_pump_ per chiller	6, 7, 8, 10, 11, 12
Heat Rejection	Heat-rejection_equipment efficiency_	User defined	gpm/hp at_design conditions_, where hp is the sum of nameplate fan and integral spray_pump_ motor hp, if applicable	6, 7, 8, 10, 11, 12
Heat Rejection	Open-circuit cooling tower flow turndown	Fixed	Flow turndown per Section 6.5.5.4	6, 7, 8, 10, 11, 12
Heat Rejection	Heat-rejection fan control	User defined	Constant or variable speed	6, 7, 8, 10, 11, 12
Heat Rejection	Heat-rejection approach and range	User defined	Design heat-rejection approach and range temperature	6, 7, 8, 10, 11, 12
Heat-Pump Loop	Loop flow and heat-pump control valve	Fixed	Two-position valve with VSD on_pump_	7, 8
Heat-Pump Loop	Heat-pump loop flow control	Fixed	Loop flow at 3 gpm/ton	7, 8
Heat-Pump Loop	Heat-pump loop minimum and maximum temperature control	User defined	User input; restrict to minimum 20°F and maximum 40°F temperature difference.	7, 8
Ground-Loop Heat-Pump Bore Field		Fixed	Bore depth = 250 ft; bore length 200 ft/ton for greater of cooling or heating load	8
Ground-Loop Heat-Pump Bore Field		Fixed	Bore spacing = 15 ft	Bore spacing = 15 ft
Ground-Loop Heat-Pump Bore Field		Fixed	Bore diameter = 5 in. with 3/4 in. nominal diameter polyethylene pipe	Bore diameter = 5 in. with 3/4 in. nominal diameter polyethylene pipe
Ground-Loop Heat-Pump Bore Field		Fixed	Ground and grout conductivity = 4.8 Btu·in./h·ft2·°F	Ground and grout conductivity = 4.8 Btu·in./h·ft2·°F

a. Applicable systems from Table L.1.1.1 Informative Note: See Section 3.3 for a full list of terms used in this table.