MECH4880 REFRIGERATION AND AIR CONDITIONING
ASSIGNMENT 1 (2024) – Part A and B Overview (Ver 1)
1. Problem Statement
A client has commissioned your company to conduct a heat load analysis and design the HVAC system for a 2-storey shopping centre, as described in the attached project specifications and drawings. Your manager has tasked you with calculating the cooling and heating loads and performing preliminary duct design and unit selection for a section of the building with the aid of preliminary computational fluid dynamics (CFD) analysis.
This assignment is divided into two parts: Part A and Part B. To submit a subsequent part, students must have already submitted all previous parts. When submitting Part B, combining it with Part A is unnecessary, but keeping a copy of the combined document yourself is highly recommended. This combined document (A-B) will be valuable for presenting your experience from the coursework to the industry, such as in future job interviews.
A professional report should be submitted for every part. The report shall include an executive summary (with a tabulated summary of results), introduction and conclusion. Figures and tables shall be appropriately captioned. A consistent referencing system shall be used throughout (e.g., IEEE or Harvard). The report shall include a contents page, a list of figures and a list of tables. The body of the report should be organised in a logical and coherent fashion. The helper document provides a useful guideline for organising the body of the report; the headings/order should be followed but maybe adjusted, and the list is not exhaustive. Writing should be concise and to the point, avoiding superfluous information or repetition of content. The report should be formatted neatly to allow information to be conveniently extracted. Each part of the assignment will have a maximum limit of 25 pages, not including appendices.
However, you should assume that the marker will not mark anything in the appendices. The following documents should be used in conjunction with this overview:
• Assignment 1 – Building Layout
• Assignment 1 – Project Specifications
• Assignment 1 – Preliminary CFD analysis results
• Assignment 1 – Assignment Helper
Part A – Due by Week 7, Friday 25th of October
Section A1
This section requires students to implement the heat load calculation methodology outlined in AIRAH- DA09. A detailed manual heat load calculations for the Gym (Planet Gym) must be performed and reported for summer and winter. Reporting must include (but not limited to) the following items:
(1) Design Day Selection and Specification Comprehension
(2) External Loads – Wall Specifications
(3) External Loads – Solar Transmission
(4) External Loads – Partitions
(5) External Loads – Winter
(6) Internal Loads – Summer
(7) Internal Loads – Winter
(8) Cooling and Heating Load Summary
(9) Psychrometrics (Summer only)
Section A2
This part requires students to compare their hand calculations for the Gym with the cooling and heating load simulation produced by CAMEL software. (Note: the results for the CAMEL simulation are provided. Students are not expected to complete the simulation on CAMEL but to discuss the results).
Ensure that you follow the assignment helper as it details the minimum that is expected from each submission.
Part B – Due by Week 10, Friday 15th of November
Section B1
This part requires students to determine the layout and function of each part within the whole shopping centre. A detailed calculation of the heating and cooling load is not required. Instead, the submission should include (but not limited to) the following elements:
(1) Produce conditioned/ventilated space maps
(2) Prepare a design brief, identifying the key factors to consider for each part of the shopping centre in terms of HVAC designs
(3) Calculate for ventilated space requirements
Section B2
This part requires students to further build upon the previous part by conducting pressure loss calculations on duct runs to determine required fan parameters. Other equipment, such as AHUs, will also be selected before concluding the report with sustainable design considerations with preliminary CFD case studies. The submission should include (but not limited to) the following elements:
(1) Air schematics
(2) Duct Design
(3) Pressure loss calculations (Ventilated spaces only)
(4) AHU selection
(5) Building improvements and sustainable design based on provided preliminary CFD case studies
Ensure that you follow the assignment helper as it details the minimum that is expected from each submission.
2. Design Constraints
Outside design conditions:
• Latitude 30。South
• Summer 34.7 。C DB / 23.3 。C WB
• Winter 4.2 。C DB/70% RH
• Building north is defined as the same as true north
• Minimum supply air temperature 12。C
• Cooling coil effectiveness, ηc 0.85
• Outside air requirements: 12.5 litres per second per person
3. Building Details
Location: Temperate Town. Climate zone 6.
Building Type: Shopping Centre (Class 6). Gym (Class 9b)
Building Description: The project is a two-storey shopping centre. The building contains a variety of services for customers in Temperate Town.