hvac system design l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
HVAC System Design PowerPoint Presentation
Download Presentation
HVAC System Design

Loading in 2 Seconds...

play fullscreen
1 / 15

HVAC System Design - PowerPoint PPT Presentation


  • 238 Views
  • Uploaded on

HVAC System Design. PES Institute of Technology. Objective. Goal: To develop an automotive air-conditioning system that is smaller and lighter than with conventional technology.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'HVAC System Design' - Antony


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
hvac system design

HVAC System Design

PES Institute of Technology

objective
Objective

Goal:To develop an automotive air-conditioning system that is smaller and lighter than with conventional technology.

The Challenge:The system must be capable of keeping a temperature of 22˚C inside a stationary black vehicle with four occupants, with an outside temperature of 40˚C. Also, the system must be an efficient heating system, keeping an internal temperature of 15˚C with an outside temperature of 0˚C.

h v a c
H.V.A.C
  • H.V.A.C – Heating, Ventilation and Air Conditioning system
  • The HVAC regulates:
    • Room Temperature
    • Humidity
    • Air Quality
    • Air Flow
refrigeration cycle

3

2

4

1

Enthalpy kJ/kg

Refrigeration Cycle

Vapour Compression Cycle

design parameters considerations
Design Parameters & Considerations
  • Heat Load on the HVAC = 5.287 kW
  • Cabin Relative Humidity = 40%
  • Evaporator Temperature = 4°C
  • Refrigerant Used = R134a
  • Refrigeration Cycle : Vapour Compression
  • Cabin design – cooling and heating requirements
  • Temperature and Humidity range
  • Placement of Vents and Ducts
  • Space considerations
  • Effect on car performance
  • Efficiency
  • Environmental Impact
cycle analysis heat load
Cycle Analysis & Heat Load

Assumptions:

  • Compression process is isentropic.
  • No pressure losses in piping.
  • Condenser temperature = 46°C.
  • Evaporator Temperature = 4° C.
  • Refrigerant is not sub cooled.

Heat Load Calculations:

  • Heat due to opaque surfaces = 3598.2 W
  • Heat due to fenestration = 1229.66 W
  • Internal Loads ( human ) = 460 W

Total Load = 5.287 kW

results
Results
  • Evaporator Pressure = 3.38 bar
  • Condenser Pressure = 11.9 bar
  • Heat Load = 5.287 KW
  • Condenser Cooling Load= 6.308 KW
  • Compressor Work = 1.02 KW
  • Mass Flow Rate = 1.94 l/min
selection basis
Selection Basis
  • Scroll Compressors –

Compact design and High Volumetric Efficiency ( around 98% ).

  • Refrigerant R134a –

Minimized environmental impact.

  • Plate-Fin Heat Exchanger-

Compact size, Higher heat transfer capability.

  • Simple design incorporated to minimize cost.
slide9

Compressor

  • Heart of the system, belt driven pump that fastened to engine.
  • Responsible for compressing and transferring refrigerant.
  • Two interleaved scrolls with involute geometry.
  • One scroll fixed while the other orbits eccentrically to compress fluid
  • Advantage:
  • Very high volumetric efficiency (almost 98%)
  • Lesser Noise and lighter compared to rotary compressor.
slide10

Condenser

  • Responsible for heat dissipation
  • The condenser is designed to radiate heat.
  • Located in front of the radiator
  • Require good air flow when system is in operation
  • Plate fin type heat exchanger with micro channels used.
  • Very compact and better heat transfer capability.
  • Hot compressed refrigerant vapour cools at constant pressure to liquid.
  • Overall Heat Transfer Coefficient = 92 W/m2K
  • Area = 6.87 m2
slide11

Accumulator

  • Depending on the vehicle, the A/C system will either have a receiver dryer or an accumulator.
  • Components contain a desiccant, chemical that attracts moisture.
  • Prevents formation of corrosive acids on mixture of water and acid.
  • Also act as temporary storage for refrigerant to prevent starving of evaporator
slide12

Evaporator

  • Heat absorption component.
  • Used remove heat from the inside of vehicle.
  • Secondary benefit - dehumidification.
  • Unconditioned air passes through a filter before entering the evaporator.
  • Plate-fin evaporator with micro channels used.
  • Overall heat transfer coefficient = 98 W/m2K
  • Area calculated = 3.04 m2
  • Fan Flow Rate = 90 l/s
looking ahead
Looking Ahead
  • Finalize and validate results based on inputs from other teams.
  • Improvise on the current design and form a cost effective solution.
  • Documentation and reports.