1. Lecture Objectives: Learn about plumbing system and pumps
Review the course topics and do the course evaluation

2. Water Cooled Chiller Loops
Cooling tower loop
Chiller water loop

3. Plumbing system
Cooling towers

4. Relationship between velocity in a pipe and pressure drop
Δp ~ v2
Δp = Constant × v2
Required power (P) for the pump
P = V × Δp P –power [W],
V –volume flow rate [m3/s], v – velocity [m/s]
Δp – pressure drop [Pa]
Δp ~ v2 (Δp ~ V2 – when same pipe is used)
P ~ V × V2 – when same pipe is used
P ~ V P2/P1 = (V2/V1)3 For the same pipe
When different pipe is used for the same flow rate:
For the same
flow rate V
Reduction of D:
smaller pipe
larger pipe
Δp [Pa or ft water] D1
D2= D1/2 A1 V1 P1
A2=1/22 A1
V2=22 V1
P2/P1 = (D1/D2)4 - for the same flow rate
or 50% smaller diameter of the pipe
for the same flow rate wee have:
4 times larger velocity
16 times larger pressure drop and
16 times lager power for the pump
v [m/s or fpm]

5. Examples of pump power P = V × Δp (all units metric) Sorption cooling
Power generation 2 1

6. Head Loss

7. Fittings

8. System Curves ∆p ∆p
A+B A B
A+B A B V A B V A B
Parallel
Serial

9. Pumps Raise pressure and produce flow Main type Centrifugal Example of
Turbine pump
Base mounted
Inline
Reading (textbook)
Page

10. Pump curves
NPSHR = Net Positive Suction Head Required

12. Changing Pump Speed

13. Net Positive Suction Head (cavitation)

14. Curve for Multiple Pumps

15. System balancing AHU1 AHU2 HC1 HC2 100 ft 1000 ft 10 gpm 2 gpm 10 ft
pump
BOILER

16. Course Summary Course Objectives:
Learn about advanced building energy and environmental control systems.
Obtain knowledge about district cooling and heating systems.
Gain the skills and tools necessary to evaluate integration of sustainable energy production systems to a given building site.
Study application of combined heat and power systems in a specific building or group of buildings.
Conduct thermal, hydraulic and economic modeling of integrated building energy systems for planning and design.
Course Topics:
Class intro and HVAC systems review
Building ventilation heat recovery systems
Thermal (solar and waste heat) powered desiccant systems
4. Centralized (compressor and sorption based) cooling systems
5. Centralized heating systems
6. District heating and cooling distribution systems
7. Geothermal buildings systems
8. Combined heat and power systems
9. Systems integration and control