Objectives - PowerPoint PPT Presentation

About This Presentation
Title:

Objectives

Description:

Title: Slide 1 Author: Jeffrey Siegel Last modified by: CFDprc1 Created Date: 8/16/2002 11:00:28 PM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

Number of Views:49
Avg rating:3.0/5.0
Slides: 24
Provided by: Jeffrey524
Category:

less

Transcript and Presenter's Notes

Title: Objectives


1
Objectives
  • Introduce HW5 Plumbing
  • Learn about district cooling and heating systems

2
(No Transcript)
3
HW5 Find a system curve for this plumbing
configuration
40 ft
20 ft
20 ft
Due date April 30th
200 ft
5 ft
30 ft
30 ft
200 ft
40 ft
10 ton
30 ft
20 ft
10 ft
5 ft
5 ft
10 ft
10 ft
5 ft
30 ft
10 ft
5 ft
5 ft
10 ton
Final project Modeling
HW5 Design
4
Hydronic systems for district cooling/heating and
buildings
Constant-Flow System, Single Chiller, Single Coil
Constant-Flow System, Single Chiller, Multiple
Coils
Mixing valve that control by-pass flow Major
pumping force is the chiller pump
5
Control of coil temperature
Mixing valve that control the flow through the
coil Flow Variation as a Function of Valve
Position
Same pressure drop like a cooling coil
Major pumping force is the chiller pump
6
Multiple chiller (or boilers)
Serial
Parallel
7
Primary-Loop Only VariableSpeed Flow
Single chiller
Multiple chillers
8
Primary and Secondary Loop Variable Flow Design
Parallel chillers
Serial chillers
9
Large Plant or Building Distribution Systems
Primary/Secondary Loops with Variable Flow and
Distributed Pumping
10
Primary/Secondary and Tertiary Pumping
11
Primary Pump Arrangements
Dedicate a pump for each chiller
Provide a common header for the pumps
12
Coil Pumping Strategies
Variable speed pumps vs. Single pas Valve vs.
Mixing valves vs. Diverting Valves
13
Impact of plumbing on acooling coil
14
Plumbing Arrangement in Buildings hydronic
systems
Radiators
Fan coil systems
Baseboard heaters
15
Valves
  • Section 5-14 and 6-15 in the textbook
  • Types
  • Butterfly Valves
  • Ball Valves
  • Globe Valves
  • Three way valves

16
Valve Sizing and Flow Coefficient
Cv value
in liter/hour or.
in Pa
Control Valve Selection For Hydronic Systems
reference http//www.google.com/url?satrctjq
esrcssourcewebcd1cadrjauact8ved0CCUQFj
AAurlhttp3A2F2Fbookstore.ashrae.biz2Fjournal
2Fdownload.php3Ffile3Dhegberg.pdfeiIvcqU_O1KM
uE2AWgloHgDAusgAFQjCNFRAMzPnbzDpAluhyk4l8u_SKKTd
w
17
Control Valve Selection For Hydronic Systems
Before Digital Control we tried to do this
Valve authority
18
Boilers
19
Coal Boiler
20
Coal burning method
Long time ago
Today 1) Fluidized bed http//www.youtube.com/
watch?v8n78CDI3GoU 2) Powdered
coal http//www.youtube.com/watch?vg1ojza-nbqs

21
Coal-fired power plant filters
  • For Particulate Maters
  • Electrostatic precipitator
  • Filter bags
  • Scrubber for SO2 (to prevent formation of
    Sulfuric acid H2SO4)
  • Grinded Limestone in water (slurry) sprayed into
    the gas fluid stream SO2 Limestone slurry ?
    Gypsum (used for wallboard)

22
Oil Gas based boilers
Gas circulate through tubes water is
in-between
Water tube boiler
23
Furnaces
For homes
Roof tops and induct heaters
Write a Comment
User Comments (0)
About PowerShow.com