Domestic Heating Design Course by Distance Learning. Course Content

Rationale

The IDHEE have identified the need for educating the plumbing and heating fraternity on how to design central heating systems from first principles.

It is true that many manufacturers provide low-cost or free computer programs to provide boiler and radiator requirements and most of these provide a solution, albeit resulting in oversized units that can result in energy inefficient systems.

A typical problem with this is that systems rarely under-heat, so the methods are "trusted", but the installer has little or no knowledge to know if the program outputs are correct.

The IDHEE Domestic Heating Design Course addresses these issues, providing the installer with the knowledge to identify potential problems resulting from the output of such computer programs and to have the confidence that a design is technically correct.

The Institute also needs a method of assessing if an installer has the necessary qualifications to be granted membership of the domestic heating industry's professional body.

How the distance learning course operates.

Having received a registration form along with the registration fee of £495.00 plus VAT (£594 inclusive of VAT) the student is sent a copy of the Domestic Heating Design Guide, the Study Notes ring binder with all the Sessions. We separately email the self-assessment questions which can be completed and returned by email or post.

The student studies the Design Guide, supporting documentation and attempts the Self-Assessment questions for each session (answers provided), and then attempts the Marked Assessment questions (homework), which is returned to the IDHEE (or Training Provider) for marking to Model Answer papers. The marks are collected by the IDHEE and amalgamated with the final examination marks. Support is available via email, Skype or by calling the IDHEE phone line 01895 820 954 or mobile 07779 251 107.

The marked assessments are returned to the student with comments by the tutor, where appropriate, along with the next set of self-assessment papers.

On satisfactory completion of Session 11, a one day assessment is arranged for the following

  1. A revision session to confirm student is ready for the final assessment
  2. A closed book, multiple choice question paper to assess general heating knowledge (around 0.75 hours)
  3. An open book calculation paper to assess the correct application of the equations used in heating design (around 1.25 hours)
  4. An open book system design paper to assess heat loss, pipe sizing, boiler sizing, expansion vessel sizing capabilities. (around 3.5 hours)

Previously, the pass mark required to be offered associate member of the IDHEE is 70%. Students achieving a mark of 90% are offered full membership and the opportunity to be entered on the Institute's Domestic Heating Consultants register subject to certain conditions.

We have recently adopted a new final examination system. Full membership is offered to those students who can show that they can, at the end of the course, complete a full heating design project. If some mistakes are made e.g. selection of wrong values, we discuss these mistakes with the student and if they provide the correct answer, we then know that the student can complete a full heating design project and so full membership is granted.

Course Fee
£594.00

Includes course materials, exam fee and first year membership for successful candidates

Exam only fee
£104.00

Course Content

Section numbers below relate to the same Design Guide sections.

1:General.

In order to satisfy the examiners and be awarded the certificate, and eligible to apply for Associate Membership of the IDHEE, the student will need to demonstrate the following :-

An understanding of the underlying principles of providing wet central heating systems that may or may not include the supply of hot water services.

An understanding of the need to provide a full specification of the materials and work needed to provide wet central heating systems that may or may not include the supply of hot water services.

3:Client Requirements.

The student will need to demonstrate an understanding of the following :-

The need to discuss with client

  • the choice of fuel
  • the type and location of boiler
  • the type and location of heat emitters
  • the possible retention and re-use of any existing equipment
  • the requirement for hot water and how it will be provided

The need to advise the client that

  • ventilation air is required to maintain air quality
  • a supply of air for combustion purposes may be required for the boiler (depends on boiler type)
  • controls are necessary, and required by the Building Regulations
  • the opportunity to improve energy efficiency measures in excess of Building Regulation requirements should be considered

4: Energy Efficiency.

The student will need to demonstrate an understanding of the following :-

  • what energy efficiency means and why it is important
  • the impact of heating systems on the environment
  • the delivered efficiencies of various fuels
  • the SAP energy rating system
  • what boiler efficiency depends upon and how it is defined
  • what makes condensing boilers more efficient
  • the different types of hot water cylinder and their efficiencies
  • how controls affect the efficiency of the system
  • the Central Heating System Specification [CheSS]

5, 6: Heat Losses and U-Values.

The student will need to demonstrate an understanding of the following :-

  • the basic principles of heat/gain loss through the building fabric
  • heat loss/gain calculations
  • the calculation of U-Values
  • the maximum U-Values allowed for new-build under the Building Regulations
  • the use of U-Value tables

7: Living Space Ventilation.

The student will need to demonstrate an understanding of the following :-

  • why ventilation is needed
  • how ventilation is achieved
  • the importance of fan duty selection
  • whole house mechanical ventilation

8, 9: Heat Loss Calculations.

The student will need to demonstrate an understanding of the following :-

  • the factors that dictate the rate of heat loss
  • the need to allow for intermittent heating

10:Heat Emitters.

The student will need to demonstrate an understanding of the following :-

  • how the output of a heat emitter is affected by temperature difference
  • the effect of heat from pipework
  • the temperatures of floor finishes with underfloor heating

11:Boilers.

The student will need to demonstrate an understanding of the following :-

  • how the size of a boiler's output can affect efficiency and running costs
  • how a regular boiler should be sized
  • how a combination boiler should be sized

12: Domestic Hot Water Supply.

The student will need to demonstrate an understanding of the following :-

  • mains fed hot water
  • cistern fed hot water
  • the difference between static pressure and dynamic pressure
  • the volumes of hot water required for types of sanitary fittings
  • the available flow rate from a combi based on the kW rating
  • the kW allowance for a regular boiler based on cylinder capacity
  • the grade of cylinder required based on the installation static head
  • the maximum length of dead legs in draw-off pipework

13: System Layouts.

The student will need to demonstrate an understanding of the following :-

  • the differences between two pipe circulation and one pipe circulation systems
  • the difference between direct return and reverse return heating circuits and the advantage of the latter
  • what reverse circulation is and how to avoid it
  • the method of sizing pipework to ensure sufficient flow against acceptable resistance
  • how to use the pipe sizing and pressure loss worksheets
  • how to establish which is the index circuit for circulator sizing

14: Circulator Selection.

The student will need to demonstrate an understanding of the following :-

  • why the circulator should be sized correctly
  • how to use performance curves to select the correct circulator setting
  • how the position of the circulator can affect system performance
  • why black or red deposits are often found in circulators that have failed
  • why a circulator should be fitted with two isolating valves
  • what should be done if a boiler's integral circulator has insufficient residual power for the system

15: Open Vented Systems.

The student will need to demonstrate an understanding of the following :-

  • the correct position for the connection of the feed & expansion pipe in relation to the circulator
  • the correct position for the connection of the open safety vent pipe in relation to the circulator
  • how to size the feed and expansion cistern
  • the requirements regarding no valves in the f&e or osv pipes
  • the relative sizes of f&e, osv and overflow warning pipes
  • close-coupled f&e and osv pipe arrangements
  • combined f&e and osv pipe arrangements
  • why and when it is necessary to clean and chemically treat pipework systems

16: Sealed Heating Systems.

The student will need to demonstrate an understanding of the following :-

  • the components required for creating a sealed heating system
  • the correct position for connecting an expansion vessel to the system
  • the importance of assessing system water volumes as accurately as possible
  • the initial and operating pressures for the expansion vessel
  • the maximum setting for the pressure relief (safety) valve
  • the arrangements for filling and topping-up the system
  • the arrangements for venting air from the system
  • how to size an expansion vessel
  • why and when it is necessary to clean and chemically treat pipework systems

17: Pipework Insulation.

The student will need to demonstrate an understanding of the following :-

  • which pipes should and which pipes should not be insulated
  • the required thickness and properties of pipework insulation
  • the difference between normal and extreme conditions related to the insulation of cold water services

18: System Controls.

The student will need to demonstrate an understanding of the following :-

  • the different system types and the controls to be used
  • the minimum set of controls required under the Building Regulations
  • the additional controls available to improve energy efficiency
  • when and why it is necessary to have an automatic by¬≠ pass valve

19: Ventilation

The student will need to demonstrate an understanding of the following :-

  • air supply requirements for combustion
  • air supply requirements for correct flue operation
  • air supply requirements for cooling (compartment ventilation)
  • the regulations regarding open flued appliances in rooms with mechanical extract ventilation
  • the design of flues to ensure adequate discharge of the products of combustion to the outside air
  • the positioning of flues in relation to openings and boundaries
  • what SE-Ducts and U-Ducts are and the appliances that can be connected to them

20: Fuel Storage.

The student will need to demonstrate an understanding of the following :-

  • the installation of oil storage and supply pipe requirements
  • the recommended size of oil storage tanks
  • the installation of LPG storage and supply pipe requirements
  • the minimum sizes of LPG storage tanks

21: The Specification.

The student will need to demonstrate an understanding of the following :-

  • the minimum information recommended in a quotation for work
  • the minimum information presented in the specification of the proposed system

22: Hand-over and Future Service.

The student will need to demonstrate an understanding of the following :-

  • the requirement to fully explain the system operation
  • the need to provide written instructions about safety, operation and guarantees
  • the importance of the certificate of compliance certificate
  • the importance of regular servicing in accordance with manufacturers instructions

23: Schedule of Installed Equipment.

The student will need to demonstrate an understanding of the following :-

  • the importance of a record of installed equipment
  • the need for record drawings of pipe runs
  • the need to provide contact details for future service requirements

App. A: Legislation.

The student will need to demonstrate an understanding of the following :-

  • the relevant Building Regulations/ Technical Standards for the work undertaken
  • gas safety legislation
  • water regulations

App. D: Conversion Factors

The student will need to demonstrate an understanding of the following :-

  • how to convert from imperial units to metric units
  • the calculations required to effect the conversions
  • the use of the conversion squares to ascertain the conversion factors
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