OA00107M-603.pdf
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- Attached to
- Oahe Powerhouse Heat Pump Replacement
- Solicitation number
- W9128F25BA003
About this file
This document is a detailed mechanical engineering specification sheet for heat pump replacement at Oahe Dam in South Dakota, prepared by the U.S. Army Corps of Engineers Omaha District. The specification provides comprehensive control sequence and performance requirements for two heat pumps (HP1 and HP2) with specific operational modes: cooling (maintaining 45°F leaving evaporator temperature), heating (maintaining 109°F leaving condenser temperature), and off positions. The document includes detailed hydronic water coil schedules for four air handling units (Systems S1-S4), specifying airflow, temperature ranges, and heating capacities, with notes indicating all existing coils must be removed and replaced.
The heat pump systems must meet minimum efficiency requirements per ASHRAE 90.1-2019 standards, with specific performance metrics for full load and integrated part-load value (IPLV) measurements. The control scheme includes complex operational rules, such as preventing simultaneous heat pump starts, implementing evening cycling of heat pumps, and enabling multiple economizer modes that can reduce energy consumption by utilizing raw water for cooling. The specification provides precise technical guidance for contractors, including flow rates, temperature set points, and valve/pump control strategies for different operational modes.
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HEAT PUMP & ASSOCIATED VALVE AND PUMP CONTROL
THE "HEAT PUMP CONTROL PANEL" SHALL HAVE A THREE POSITION SWITCH:
"COOLING" POSITION
HEAT PUMP (HP)- SHALL BE ENERGIZED TO MAINTAIN 45°F (ADJUSTABLE) LEAVING
EVAPORATOR TEMPERATURE. IF NO FLOW THROUGH THE CONDENSER OR EVAPORATOR IS
DETECTED BY THE ASSOCIATED FLOW SWITCH THE HP SHALL BE TRIPPED OFF. DURING
START-UP THE FLOW SWITCHES SHALL BE LOCKED OUT UNTIL THE PUMPS HAVE TIME
TO ESTABLISH FLOW. THE LOW TEMPERATURE CUTOUT SHALL BE SET (ADJUSTABLE)
PER MANUFACTURERS SUGGESTION TO TRIP OUT THE HP WHEN THE TEMPERATURE DROPS
BELOW THE SET POINT.
PUMP - ENERGIZED
VALVES - SEE "HEAT PUMP ASSOCIATED VALVE AND PUMP CONTROL SCHEDULE ON SHEET M-601"
THE "WATER SUPPLY TO HEAT PUMPS CONTROL PANEL" SHOULD BE SET IN THE
"COOLING/ECONOMIZER (RAW WATER)" POSITION. IF "SYSTEM NO. 4 CONDITIONING
WATER CONTROL PANEL" IS SET IN THE "ECONOMIZER (RAW WATER)" POSITION NO
MORE THAN ONE HP SHALL BE IN OPERATION (SHALL BE ACCOMPLISHED MANUALLY).
"OFF" POSITION
HEAT PUMP (HP) - OFF
PUMP - OFF
VALVES - CLOSED
"HEATING" POSITION
HEAT PUMP - SHALL BE ENERGIZED TO MAINTAIN 109°F (ADJUSTABLE) LEAVING
CONDENSER TEMPERATURE. IF NO FLOW THROUGH THE CONDENSER OR EVAPORATOR IS
DETECTED BY THE ASSOCIATED FLOW SWITCH THE HP SHALL BE TRIPPED OFF. DURING
START-UP THE FLOW SWITCHES SHALL BE LOCKED OUT UNTIL THE PUMPS HAVE TIME
TO ESTABLISH FLOW. THE LOW TEMPERATURE CUTOUT SHALL BE SET (ADJUSTABLE)
PER MANUFACTURERS SUGGESTION TO TRIP OUT THE HP WHEN THE TEMPERATURE DROPS
BELOW THE SET POINT. A TIMER SHALL PERFORM THE SAME FUNCTION AS THE "OFF"
POSITION FROM 11 PM (ADJUSTABLE) UNTIL 8 AM (ADJUSTABLE). ONE OF THE HEAT
PUMPS SHALL BE SET TO BE OFF DURING THE EVENING. YEARLY THE TIMERS SHALL
BE MANUALLY CHANGED TO CAUSE THE OTHER HEAT PUMP TO CYCLE OFF IN THE
PUMP - ENERGIZED
THE "WATER SUPPLY TO HEAT PUMPS CONTROL PANEL" SHOULD BE SET IN THE
"HEATING (GENERATOR WATER)" POSITION.
DURING THE COOLING SEASON THE CONDITIONING SYSTEM CAN BE RUN IN THE ECONOMIZER
MODE. THE ECONOMIZER MODE WILL REDUCE ENERGY CONSUMPTION BY THE HEAT PUMPS.
THERE ARE SEVERAL POSSIBLE ECONOMIZER MODES. ONE IS TOTAL ECONOMIZER IN WHICH
ALL SYSTEMS UTILIZE RAW WATER FOR COOLING AND THE HEAT PUMPS ARE OFF. SYSTEM 4
CAN BE IN AN ECONOMIZER MODE, COOLING WITH RAW WATER, WHILE SYSTEMS 1-3 ARE
COOLED BY ONE OF THE HEAT PUMPS. THERE ARE SEVERAL OTHER COMBINATIONS OF RUNNING
RAW WATER THROUGH SYSTEM(S) FOR COOLING THE OTHER SYSTEM(S).
THE "WATER SUPPLY TO HEAT PUMPS CONTROL PANEL" MUST BE SET IN THE
"COOLING/ECONOMIZER (RAW WATER)" POSITION FOR ANY OF THE ECONOMIZERS MODES TO
WORK. FOR SYSTEM 4 TO BE IN THE ECONOMIZER MODE "SYSTEM NO. 4 CONDITIONING WATER
CONTROL PANEL" MUST BE SET IN THE "ECONOMIZER (RAW WATER)" POSITION AND NO MORE
THAN ONE HEAT PUMP IN OPERATION. FOR SYSTEMS 1-3 MANUAL CLOSING OF THE AIR
CONDITIONER WATER VALVES AND OPENING OF THE RAW WATER VALVES IS REQUIRED TO
CHANGE OVER TO ECONOMIZER MODE.
"ECONOMIZER" MODES
HP1 AND HP2 SHALL NOT START SIMULTANEOUSLY.
START SIMULTANEOUSLY.
EVENINGS WHILE IN THE HEATING POSITION. HEAT PUMP HP1 AND HP2 SHALL NOT
HEAT PUMP SEQUENCE OF CONTROL
VALVES - SEE "HEAT PUMP ASSOCIATED VALVE AND PUMP CONTROL SCHEDULE ON SHEET M-601"
MODE
HEAT PUMP SCHEDULE (HP1 & HP2)
(DEG. F)
OUTLET
(GPM)
FLOW
(DEG. F)
INLET
(MBTUH)
LOAD
REMARKS
EVAPORATOR CONDENSER
(DEG. F)
OUTLET
(GPM)
FLOW
(DEG. F)
INLET
(MBTUH)
LOAD
REMARKS
COOLING 350
- -HEATING 39.5 350 GENERATOR WATER 97 109 350 2100 AC WATER
54.4 45 1645 AC WATER 77 - - RAW RIVER WATER350
AHU HYDRONIC WATER COIL SCHEDULE
UNIT CFM GPM
BTUH TEMP. F TEMP. F TEMP. F TEMP. F
BTUH BTUH D.B. W.B. D.B. W.B. TEMP. F TEMP. F FT. H2O FT. H2O FPM
QTY.
ENT AIR ENT. H2O LEAV.H2O
CAP CAP
ENT. AIR TEMP. F LEAV. AIR TEMP. F
H2O H2O PRESS DROP PRESS DROP VELOCITY
LATENT SENSIBLE MAX. WATER MAX AIR MAX FACE
HEATING CAP LEAV AIR
ENT LEAV
NOTE:
6. NOTE THAT SYSTEM 3 AHU HAS TWO (2) COIL SECTIONS (UPPER / LOWER). COIL CAPACITY SHOWN ON THE SCHEDULE IS THE COMBINED TOTAL CAPACITY.
5. ALL EXISTING COILS OF SYSTEMS S1, S2, S3, AND S4 SHALL BE REMOVED AND REPLACED WITH NEW.
4. SYSTEM 4 AHU MANUFACTURER / MODEL INFORMATION ARE NOT AVAILABLE. COIL CAPACITY IS ESTIMATED FOR BIDDING PURPOSE. CONTRACTOR MUST FIELD VERIFY COIL CAPACITY.
3. SYSTEM 3 AHU IS A TRANE CLIMATE CHANGER SIZE 35 MODEL 14 SERIAL NO. 195590.
2. SYSTEM 2 AHU IS A TRANE CLIMATE CHANGER SIZE 21 MODEL 3 SERAL NO. 195589.
1. SYSTEM 1 AHU IS A TRANE CLIMATE CHANGER SIZE 10 MODEL 3 SERIAL NO. 195588.
S1 5110 30
S2 10500 95
S3 18600 155
97500 62.3 79.9 109 102.5
584250 56.6 108.1 109 96.7
1430000 32 103.2 109 90.5
21500
82000
130000
317000
690000
83.0
81.3
90.3
67.5
59.4
53.3
56.8
54.3
53.9
52.1
0.75
2.0
1.5
S4 10700 100 650000 55 110.0 109 96 55000 353100 83 65 53 53 45 55 25 1.5 550 6
NOTE:
(KW/TON) TEST PROCEDURE(AHRI 550/590) PER ASHRAE 90.1-2019
1. HEAT PUMPS MUST MEET THE FOLLOWING MINIMUM EFFICIENCY REQUIREMENTS (<0.66 FL, & <0.540 IPLV.IP (KW/TON) OR <0.68 FL, & <0.440 IPLV.IP
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