Infiltration/Ventilation HVAC 7a CNST 305 Environmental Systems 1 Dr. Berryman.

Slides:

Advertisements

Similar presentations

Environmental Controls I/IG

Advertisements

Heating Losses- Infiltration and Ventilation

HEAT LOSS & HEAT GAIN HEAT FLOW. Heat flows from high temperature to low temperature There are 3 types/methods of heat flow/transfer: 1.Conduction- through.

Heating and Air Conditioning I Principles of Heating, Ventilating and Air Conditioning R.H. Howell, H.J. Sauer, and W.J. Coad ASHRAE, 2005 basic textbook/reference.

Environmental Controls I/IG

Heating and Air Conditioning I

Load Calculations Dr. Sam C M Hui MECH3005 – Building Services

Psychrometry HVAC CNST 305 Environmental Systems 1 Dr. Berryman 5cIndoor Air Quality, Psychometrics; Dry and Wet Bulb; Enthalpy; Condensation; Dew Point.

The House as a System 1. Air Temperature and Water Vapor.

HVAC 7ab CNST 305 Environmental Systems 1 Dr. Berryman

Environmental Controls I/IG Lecture 12 Cooling Loads Cooling Degree Hours Energy Performance Ratings Annual Fuel Consumption Lecture 12 Cooling Loads Cooling.

Conduction Cooling Loads

Heat Loss & Gain Calculations 1. How Heat Moves in Homes Conduction is the transfer of heat through solid objects, such as the ceilings, walls, and floors.

Psychrometry HVAC CNST 305 Environmental Systems 1 Dr. Berryman 5cIndoor Air Quality, Psychometrics; Dry and Wet Bulb; Enthalpy; Condensation; Dew Point.

Heat Loss HVAC CNST 305 Environmental Systems 1 Dr. Berryman.

Heating and Air Conditioning I Principles of Heating, Ventilating and Air Conditioning R.H. Howell, H.J. Sauer, and W.J. Coad ASHRAE, 2005 basic textbook/reference.

Heat Transmission HVAC CNST 305 Environmental Systems 1 Dr. Berryman.

Energy Conserving Alternatives HVAC 15a CNST 305 Environmental Systems 1 Dr. Berryman.

Best Direction System Ltd.

Energy use in buildings Dr. Atila Novoselac Associate Professor Department of Civil, Architectural and Environmental Engineering, ECJ

F LORIDA S OLAR E NERGY C ENTER A Research Institute of the University of Central Florida Assessment of Energy Efficient Methods of Indoor Humidity Control.

Heat Loss and Gain Heat Loss and Gain

HVAC523 Heat Gain. Heat First law of thermal dynamics states that HEAT TRAVELS FROM HOT TO COLD. 95 degree outside air will flow through the building.

Lecture Objectives: Model HVAC Systems –HW3 Asignemnet Learn about eQUEST software –How to conduct parametric analysis of building envelope.

Why we need to calculate heating load ?

BEM CLASS 5 Building Thermodynamics – 2 Air-conditioning Load Calculation – latent heat, solar and internal gains.

Conditioning of Moist Air

ARCH-432 Vapor Retarders and Air Barriers Attendance In what modern day country was the first cavity wall developed and used? For what purpose? A. Spain.

Ductless Heat Pumps Sizing Example

Energy use in buildings Dr. Atila Novoselac Associate Professor Department of Civil, Architectural and Environmental Engineering, ECJ

1)Does ECJ have a larger heating or cooling load? A.Heating B.Cooling.

A Trane Air Conditioning Clinic Psychrometry Air Conditioning Clinic TRG-TRC001-EN © American Standard Inc

 On average, home heating uses more energy than any other system in a home  About 45% of total energy use  More than half of homes use natural gas.

Objectives Lean about energy transport by air Calculate Cooling and Heating loads Solve 1-D conduction Design whether condition Use knowledge of heat transfer.

HVACR416 - Design Heat Loss / Heat Gain Part 1. Why? The primary function of Air Conditioning is to maintain conditions that are… o Conductive to human.

Objectives Analyze processes in AHU and buildings.

EXAMPLE EXERCISE CALCULATING HEAT LOSS & HEAT GAIN  Several exhibits in the class packet are necessary to understand the entries into the Heat Loss /

INTRODUCTION TO HEAT LOAD HEAT LOAD12 3 TOPICS COVERED INTRODUCTION DESIGN CONSIDERATIONS DEFINITIONS/CONCE PT/FORMULA THE FORM LOAD COMPONENTS –External.

Announcements 1) Thursday 02/09 In class Midterm Exam - I will be in the classroom at 9:20 AM - Example and solution are posted on the course website 2)

Introduction to Energy Management. Lesson 4 Determining the Loads on the HVAC System.

Lecture Objectives: Differences in Conduction Calculation in Various Energy Simulation Programs Modeling of HVAC Systems.

Design What is the first step in designing a high-performance building? Would it be: Identify synergies Select the correct HVAC system Design around human.

Objectives Propose residential system related final project –Compare VAV systems with DOAS systems.

Heat Loss and Gain Civil Engineering and Architecture

Building Environmental Systems

Technology in Architecture

Maria’s Restaurant Chapter 1 Section 3

Heat gain in buildings: Other factors

Ritchie Yellow Jacket Instrument Applications

Heat loss and heat gain in buildings: Outside air (OA) (Additional information) Required to be brought inside a building envelope to continuously replace.

Heat Loss and Gain.

Heat Loss and Gain Heat Transfer Winter Heat Loss Summer Heat Gain

Conduction Cooling Loads

Introduction – Who am I? Environmental Project Manager – Trident Technical College Mechanical Engineer Licensed Builder South Carolina Accredited Commercial.

Technology in Architecture

Technology in Architecture

Heat Loss and Gain Heat Loss and Gain

Zoning Load Calculations

Heat Loss and Gain Heat Loss and Gain

Zoning Methods There are an unlimited number of ways to zone a home! Popular ways include: More than one single zone HVAC system. Zone damper systems.

Technology in Architecture

Why we need to calculate heating load ?

Technology in Architecture

Technology in Architecture

Lecture Objectives Psychrometrics Define Heating and Cooling Loads

Announcements Exam 1 Next Class (Thursday, March 14th):

Heat Loss and Gain Heat Loss and Gain

Maria’s Restaurant Chapter 1 Section 3

Presentation transcript:

Infiltration/Ventilation HVAC 7a CNST 305 Environmental Systems 1 Dr. Berryman

Infiltration Types of heat losses? Types of heat gains?

Calculating Infiltration Crack method Air change method Effective leakage-area method Sensible BH = 1.08 x T x CFM Latent BH = 0.68 x G x CFM Equations w/ Air Constants

Air Crack Method Divide by 60 min for CFM Lower pressure differentials mean tighter construction

Crack Example (winter) EXAMPLE Given: 3 o 5 o Double Hung Window No added humidification IA conditions: DB=75 o F OA conditions: DB=-5 o F Medium Construction How many BTUH are lost due to frame wall infiltration?

Air Change Converts equation to cubic feet Equals one room change Designer will use 0.3 to 2.0 room changes per hour Occupancy Climatic condition (i.e. winter vs. summer) Construction (tight or loose) Least accurate of the three methods BH sens = 1.08 x T x CF 60

Air Change Example EXAMPLE Given: 20’ x 60’ x 10’ room Winter RCH No added humidification IA conditions: DB=75 o F OA conditions: DB=-5 o F How many BTUH lost due to infiltration?

Ventilation + pressure 1600 CFM 200 CFM 1400 CFM FA SA RA

Calculating Ventilation CFM per Person Use ASHARE chart Room Air Change per Hour 0.5 – 2.0 RCH Sensible BH = 1.08 x T x CFM Latent BH = 0.68 x G x CFM Equations w/ Air Constants

Determining Ventilation Requirements Determinates Building Application # Occupants

Ventilation - CFM per Person EXAMPLE Given: 2000 SF Coin Operated Laundry Winter design No added humidification IA conditions: DB=75 o F OA conditions: DB=-5 o F How many BTUH lost due to ventilation?

Ventilation - Room Change Given: 2000 SF Coin Operated Laundry - 10’ walls Winter design 2.0 RCH No added humidification IA conditions: DB=75 o F OA conditions: DB=-5 o F How many BTUH lost due to ventilation?

Summer Conditions - CFM per Person Given: 2000 SF Coin Operated Laundry 15 CFM/person summer IA conditions: DB=75 o F 40%RH OA conditions: DB= 95 o F WB=80 o F How many BTUH gained due to ventilation? BH sens = 1.08 x T x CFM BH lat = 0.68 x G x CFM

In Class: Given: 2000 SF Coin Operated Laundry 10’ walls 1.5 RCH IA conditions: DB=75 o F 40%RH OA conditions: DB= 95 o F WB=80 o F How many BTUH gained due to ventilation? Summer Conditions - Room Change

Next Time Heat Gains Chapter 2.6 – 2.8 (Toa)rooflights equipme nt floor exteriorwall glass solar glass conductio n infiltration people