ABBE LEVEL 4 DIPLOMA IN AIR CONDITIONING ENERGY ASSESSMENT ABBE LEVEL 4 DIPLOMA IN AIR CONDITIONING ENERGY ASSESSMENT (QCF)

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1 E LEVEL 4 IPLOM IN IR ONITIONING ENERGY SSESSMENT E LEVEL 4 IPLOM IN IR ONITIONING ENERGY SSESSMENT (QF) SMPLE EXMINTION QUESTIONS The purpose of this document is to provide examples of typical questions and how they are presented under the main topics covered in the examination. Please note that these questions have come from past examination papers and may reflect legislation and/or specifications that have since been updated; the main purpose is to give an indication of the level and focus of what to expect. nswers are not provided for these questions. We hope that by reviewing this sample you enter the exam room with more confidence as to what to expect. Good luck! Examination duration: 70 minutes

2 SMPLE QUESTION PPER 1 ategory: The legislative framework (3 questions) Question 1 Refrigeration and air conditioning systems with an input power in excess of 25 kw trigger compliance with which regulations? F Gas Regulation 2007 Pressure Systems Safety Regulations 2000 HSE pproved ode of Practice L8 None of the above Question 2 Which ONE of the following hazards is water treatment intended to prevent in a cooling tower that supplies water to a water-cooled condenser? avitation Metallic corrosion lostridium difficile Legionella Question 3 What value is given in the Non omestic Heating, Ventilation and ir onditioning ompliance Guide (NHVG) for the minimum full load Energy Efficiency Ratio (EER) for air cooled, vapour compression cycle chillers?

3 ategory: Preparing for the energy assessment of air conditioning systems (3 questions) Question 4 Which ONE of the following does ISE TM44 regard as being an Essential piece of pre-inspection information? Floor plans and schematics of air conditioning systems Records of sub metered air conditioning plant use or energy consumption n estimate of the design cooling load for each system or a brief description of the occupation and power consuming equipment normally used in those spaces Reports from earlier inspections of the air conditioning systems Question 5 Failure to obtain pre-inspection information that ISE TM44 considers Essential would: Extend the time needed for the on-site inspection ause the energy assessor to postpone the on-site inspection until the information could be obtained Prevent the energy assessor from proceeding with the inspection as they would be unable to assess their competence for the task Have no effect as gathering Essential information is an integral part of all inspections Question 6 Obtaining sufficient information about the air conditioning plant installed in a building will: Reduce the time and cost of the inspection Enable the assessor to establish if the building is within their level of competence Enable the assessor to draw up a draft scope of works ll of the above 3

4 ategory: ir conditioning technology complex systems (20 questions) Question 7 The energy use of a refrigerating plant depends on condensing and evaporating temperatures, although it is also influenced by compressor efficiency and the choice of refrigerant. drop in condensing temperature of 1 o would: Reduce energy use by 3% Reduce energy use by 10% Increase energy use by 3% Increase energy use by 10% Question 8 Which ONE of the following chillers is likely to operate with a oefficient of Performance (OP) of 1? ir cooled vapour compression Water cooled vapour compression ir cooled single effect absorption Water cooled double effect absorption Question 9 Which two commonly used refrigerants operate with very high discharge temperatures? Ethane (R170) and Propane (R290) hlorodifluoromethane (R22) and mmonia (R717) Ethane (R170) and Methane (R50) mmonia (R717) and Propane (R290) 4

5 Question 10 In a mechanical ventilation system with a 50% (of the design flow rate) minimum fresh air requirement, which ONE of the following on their own is likely to be the most efficient means of heat recovery: Run-around coils Thermal wheels ross-flow heat exchangers ir re-circulation Question 11 Which ONE of the following is a device used to cool water through the process of partial evaporation? e-superheater Evaporator fan ooling tower Evaporative condenser Question 12 ccording to arbon Trust Guide 005, what should be a typical range for a dead band between heating and cooling? 0.5K 2K 5K 10K 5

6 Question 13 typical screw compressor operates at a condensing to evaporating pressure ratio of what? 1:4 4:1 40:1 1:40 Question 14 The components shown are filters used in water filtration for direct water side free cooling systems. What is this type of filter called? utomatic back-flushing single element filter Multi-element in-line filter with automatic forward flushing utomatic back-flushing variable gap multi-element filter None of the above 6

7 Question 15 Which ONE of the following fan types has the maximum static efficiency? Forward-curved or multivane centrifugal xial flow (without guide vanes) xial flow (with guide vanes) Straight or paddle-bladed centrifugal Question 16 In general, the energy benefits of a O 2 controlled ventilation system manifest themselves in buildings with: Full fresh air ventilation systems with heat recovery re-circulation system Occasional occupancy ense occupancy Question 17 What will be the Energy Use Indicator (EUI) value for an air handling system in an air conditioned office with 3,500 running hours per year? Given: Specific Fan Power = 2W/(l/s) and ir Handled = 4 (l/s)/m 2 14kWh/m 2 /yr 24kWh/m 2 /yr 28kWh/m 2 /yr 70kWh/m 2 /yr 7

8 Question 18 What is the term for a technique that allows simultaneous mechanical and free cooling when ambient conditions are favourable? Latent heat of condensation Hysteresis Load shaving esiccant cooling Question 19 In a double effect steam absorption chiller, approximately what amount of cooling can be produced from 1500kW of heat given a heat dissipation ratio 1.83 and typical chilled water conditions? 1200kW 1500 kw 1800 kw 2745 kw Question 20 In an air conditioning system utilising chilled water distribution, the energy consumption of delivering water at 10 0 is lower than at 6 0 which, for an identical cooling load, would also allow: Smaller pumps and distribution pipework Increased chilled water flow rates Smaller cooling coils within air handling units n increase in the kw output of the chiller plant Question 21 n oversized centrifugal air conditioning plant could suffer from which of the following? Frequent on/off cycling of the plant Surging of centrifugal machines at low loads oth of the above None of the above 8

9 Question 22 Which ONE of the following steps is NOT required to compare cooling loads? alculate an occupancy density Obtain the total area of the treated space Obtain air flow rates erive a value for heat gained per unit area Question 23 The possible cause of an absorption chiller NOT achieving its operational rating is? ompressor suction strainer blocked Pump capacity is appears to be oversized Heat supply to generator is not sufficient oth and above Question 24 What advice would you give your client if you determined that bad odours in an area were specifically due to crosscontamination? heck the air handling unit for a burst filter, heating coil fouling or pooling around the cooling coil heck if the terminal unit chilled water valve is stuck open heck that the exhaust rate is greater than supply in area of complaint ll of the above Question 25 uring your inspection of a chilled water system you find that the secondary water temperature is too high. What could be the cause of this? Excessive mixing of primary water Insufficient mixing of primary water ir in the system hiller thermostat set too low 9

10 Question 26 With reference to air handling systems what could be a possible reason for air supply or distribution to occupied areas being limited? Water frozen in closed circuit cooling towers Supply air diffuser deflection set incorrectly Leaky ductwork and/or open access doors affecting balancing Heater battery diverting valve stuck open ategory: Inspect complex air conditioning systems (7 questions) Question 27 While inspecting an air-conditioning system, an assessor may need to seek formal approval from the owner or manager prior to using which ONE of the following? Infrared thermometer Smoke pencil to observe air flows Turbine anemometer Laser distance meter Question 28 While inspecting a centralised cooling system, records of calibration and maintenance operations carried out on control systems and sensors are: n essential requirement desirable requirement n optional requirement Not required 10

11 Question 29 Which ONE of the following items of equipment would be used to check whether a roof-mounted chiller was operating at full load? Infrared temperature sensor Smoke pencil Thermocouple probe urrent measuring tongs (clamp meter) Question 30 With Legionella treatment programmes, which of the following factors will influence the effectiveness of any treatment programme? orrosion Microbiological activity Fouling ll of the above Question 31 The design and control of ice storage systems is dealt with in: ISE TM39 ISE TM44 ISE TM18 None of the above Question 32 What is the minimum required coefficient of performance (op) for absorption heat pumps, when operating at design conditions, in new and existing buildings?

12 Question 33 complex installation has 50 fan coil units. How many units will you inspect to meet the requirements laid down in ISE TM44? 10% 1 or 2 1 in 5 number which is sufficient to establish an indication of the state of maintenance of the overall number ategory: Report on the energy performance of air conditioning systems (7 questions) Question 34 ue to missing Essential information from the client you have to produce a minimum portfolio of relevant documentation for the inspected installation. Which of these types of information would NOT be required for inclusion within the portfolio? escription of the method of control of temperature escription of the routine maintenance frequencies escription of the installed plant and its location escription of the method of time control for periods of operation Question 35 Which of the following items of information must be included in a centralised air conditioning cooling systems report? Sources of good practice publications on the ownership and efficient operation of air conditioning systems Sources of funding that might support further investigations and improvements in efficiency omments on the adequacy of equipment maintenance and any suggestions made for improvement None of the above 12

13 Question 36 In your report you have recommended a series of controls adjustments. Which ONE of the following pieces of advice might your client reasonably expect to obtain from your report and to use as a future comparison? The reduction in maintenance costs The estimated effect on operational performance The reduction in carbon emissions The savings in energy consumption Question 37 To qualify for funding via the Enhanced apital llowance scheme the equipment which you recommend would have to be included in which ONE of the following? Energy Test List Energy Technology List Equipment Technology List Equipment Test List Question 38 You are inspecting a room that has a split system cassette located in the false ceiling and some radiators fitted round the periphery. You record that the room thermostat is set at 21 o and the air conditioning controller at 19 o. s a result you: Swap the settings to prevent both the heating and cooling systems from operating at the same time o nothing, the settings are fine Increase the room thermostat setting to 22 o and the controller to 18 o because the current difference in settings is too small to prevent both from operating at the same time Record the room settings in your report and the risk that both systems could operate at the same time and advise the building owner/manager of this at the earliest opportunity 13

14 Question 39 Which of these solar shading measures has the most limited effect at reducing solar gains in perimeter areas where glazing exceeds 40% of the facade? Internal blinds Mid pane blinds External blinds Overhangs Question 40 Upon inspection you have determined that the installations are not being maintained regularly. In your report, which of these information sources would you NOT suggest your client uses as a basis of specifying and procuring a routine maintenance regime? S EN HV SFG20 ISE Guide M S

15 SMPLE EXMINTION PPER 2 ategory: The legislative framework (3 questions) Question 1 In broad terms, the Energy Performance of uildings irective (EP) lays down four requirements for member nations. Which ONE of the following is the correct set of requirements? common (national) energy calculation methodology; maximum limits on O 2 emissions; Energy Performance ertificates; air conditioning inspections common (National) energy calculation methodology; minimum standards on energy performance; Energy Performance ertificates; maximum limits on refrigerant gas emissions common (National) energy calculation methodology; minimum standards on energy performance; Energy Performance ertificates; air conditioning inspections anded energy categories for all new domestic appliances; minimum standards on energy performance; Energy Performance ertificates; air conditioning inspections Question 2 If the person in control of an air conditioning system changes on 11 November 2011 and the new relevant person is not given an inspection report, within what time period will a new inspection be required to be carried out? 3 months 6 months 1 year 5 years Question 3 In order to comply with current Part L uilding Regulations, the minimum Energy Efficiency Ratio (EER) of new Split, Multi Split and VRF systems is:

16 ategory: Preparing for the energy assessment of air conditioning systems (3 questions) Question 4 Which ONE of the following does TM44 regard as being an Optional piece of pre-inspection information? Itemised list of installed air conditioning and refrigeration plant Written Scheme of Examination provide by the Health & Safety Executive and in accordance with the Pressure Systems Safety Regulations 2000 statement by the manager if any remote monitoring equipment is used to continually observe the equipment including the parameters monitored and the operating efficiency of the equipment Records of calibration and maintenance operations carried out on control systems and sensors, or MS systems and sensors Question 5 Which ONE of the following does TM44 regard as being a esirable piece of pre-inspection information? Written Scheme of Examination provide by the Health & Safety Executive and in accordance with the Pressure Systems Safety Regulations 2000 escription of method of control of periods of operation escription of method of control of temperature Records of calibration and maintenance operations carried out on control systems and sensors, or MS systems and sensors Question 6 Which ONE of the following hazards is water treatment intended to prevent in a cooling tower that supplies water to a water-cooled condenser? avitation Metallic corrosion lostridium ifficile Legionella 16

17 ategory: ir conditioning technology complex systems (20 questions) Question 7 On the vapour compression cycle hardware diagram shown, process 4 to 5 is: e-superheat on entry to condenser, reducing pressure at constant enthalpy e-superheat on entry to condenser, reducing enthalpy at constant pressure e-superheat on entry to evaporator, reducing enthalpy at constant pressure e-superheat on entry to evaporator, reducing pressure at constant enthalpy Question 8 The Total Equivalent Warming Impact (TEWI) takes into account the direct and indirect contributions of the Global Warming Potential of refrigerants in an air conditioning system. Which ONE of the following is NOT taken into account? Ozone epletion Potential (OP) Energy consumption to operate the system Impact of recovery losses Impact of leakage losses 17

18 Question 9 Which ONE of these fan types is more suited with applications for lower volumes? entrifugal fan with forwarded blades entrifugal fan with straight radial blades entrifugal fan with backward blades Propeller fan Question 10 Which of the following describes the advantage(s) of wet cooling towers over their dry cooler equivalents? ecause in the case of cooling towers, the amount of heated water discharged (blow down) is very small ecause the water consumption rate of a cooling tower system is only about 5% of that of a once-through system ecause cooling towers can cool water to within 2 to 3 K of the ambient wet-bulb temperature ll of the above Question 11 Why is the audelot cooler different in operation to most other liquid coolers? It reduces the process water temperature to below freezing It does not require a storage tank at the base It has a thin film of water running down the outside of the refrigerant tube or plates The evaporator is formed from copper tube Question 12 What is the typical electrical motor size of a scroll compressor? Less than or equal to 12kW kW kw Greater than 250kW 18

19 Question 13 Which ONE of the following considerations should be made at the design stage of a ventilation system to reduce energy consumption? uctwork should be designed to achieve minimum pressure loss by using high velocity systems The length of ducts should be maximised by carefully siting the plant room and air-handling units careful balance must be struck between filtration efficiency and pressure drop which both vary with time for a given installation Excessive ductwork decreases pressure drop, and increases fan duty and energy consumption Question 14 What is the name of the component shown in the diagram? Thermostatic compensating valve utomatic drain Thermostatic expansion device None of the above 19

20 Question 15 When comparing evaporative cooling towers with dry coolers as heat rejection devices for chiller plant, the evaporative cooling tower: Requires more maintenance but is more efficient Requires less maintenance and is more efficient Requires less maintenance but is less efficient Requires more maintenance and is less efficient Question 16 What will be the Energy Use Indicator (EUI) value for an air handling system in an air conditioned office with 3,500 running hours per year? Given: Specific Fan Power = 2W/(l/s) and ir Handled = 4 (l/s)/m 2 14kWh/m 2 /yr 24kWh/m 2 /yr 28kWh/m 2 /yr 70kWh/m 2 /yr Question 17 Which ONE of these is an advantage of Variable ir Volume (VV) systems? No special diffusers required for good room air distribution at low loads No additional sound attenuation required for maximum velocity Opportunity to reduce HU and duct size compared to multizone system if diversity is allowed on cooling load ll of the above 20

21 Question 18 The process of removing air and/or non-condensable gases from an absorption chiller is called? Purging ooling duty Suction Part load operation Question 19 Which capacity control method is used with screw compressors greater than 200kW? Inlet vane and variable speed drive ylinder unloading Slide valve and variable speed drive None of the above Question 20 What is the term for a technique that allows simultaneous mechanical and free cooling when ambient conditions are favourable? Latent heat of condensation Hysteresis Load shaving esiccant cooling Question 21 Specific Fan Power (SFP) for an individual fan is calculated in which ONE of the following ways? Individual fan power ir flow rate through fan Total fan power of supply fan + total fan power of exhaust esign air flow rate esign air flow rate Total fan power of supply + total fan power of exhaust irflow rate through the fan Individual fan power 21

22 Question 22 ccording to the uilding Services Research and Information ssociation (SRI) Rules of thumb, what is the floor space allowance for an air conditioning fan coil systems plant? % % % 45% 60 % Question 23 What could be the possible cause, if the occupants complain of excessive cold during the summer months? ir supply temperature too high ir supply rate too low Heating output too high during the day None of the above Question 24 uring your assessment you find that the low pressure switch has tripped resulting in the compressor failing to start, possible causes of this are? Liquid solenoid valve not opening Low air flow across the evaporator Faulty compressor starting relay oth and above Question 25 In chilled water systems, what could be the possible cause of the primary water temperature running too high? hiller thermostat set too high Insufficient mixing of primary water ir in the system ll of the above 22

23 Question 26 High compressor discharge temperatures can lead to: High condensing pressures High compression ratios Low suction pressures ll of the above ategory: Inspect complex air conditioning systems (7 questions) Question 27 On review of energy consumption records, excessive consumption could be due to: control problem n Installation issue affecting efficiency maintenance issue affecting efficiency ll of the above Question 28 In which ONE of these circumstances must an inspector inspect all the outdoor units of an air conditioning installation? When the installation consists of a series of packaged air conditioning systems When the installation consists of a series of variable refrigerant flow air conditioning systems When the installation consists of a series of multi-split air conditioning systems When the installation consists of more than 20 similar outdoor air handling units 23

24 Question 29 In relation to an air handling unit s distribution system, what checks should be instigated if the internal room temperature is excessively high during the summer? heck if the fire dampers have closed heck if changes in heat gains have occurred (eg artificial lights, IT equipment) heck if filters are overloaded, cooling coil fouled, chilled water valve position incorrect or air supply temperature setpoint incorrect ll of the above Question 30 The design and control of ice storage systems is dealt with in: ISE TM39 ISE TM44 ISE TM18 None of the above Question 31 Typical chiller condenser cooling water temperatures are: 19.4 flow and 25.0 return 29.4 flow and 35.0 return 19.4 flow and 35.0 return None of the above Question 32 Which ONE of the following documents referred to within ISE TM44 contains helpful information and data that can be used to estimate heat gains and cooling loads? ISE TM39 ISE Guide ISE Guide M ISE TM31 24

25 Question 33 What is the minimum required coefficient of performance (op) for absorption heat pumps, when operating at design conditions, in new and existing buildings? ategory: Report on the energy performance of air conditioning systems (7 questions) Question 34 ue to missing Essential information from the client you have to produce a minimum portfolio of relevant documentation for the inspected installation. Which ONE of the following types of information would NOT be required for inclusion within the portfolio? escription of the method of control of temperature escription of the routine maintenance frequencies escription of the installed plant and its location escription of the method of time control for periods of operation Question 35 Which of the following items of information must be included in a centralised air conditioning cooling systems report? Sources of good practice publications on the ownership and efficient operation of air conditioning systems Sources of funding that might support further investigations and improvements in efficiency omments on the adequacy of equipment maintenance and any suggestions made for improvement None of the above 25

26 Question 36 ccording to ISE Guide TM44, the primary purpose of the ir onditioning Inspection report is to: Record the manufacturer, model and serial numbers of the main components so the building owner/manager has all the key information recorded in one place Record all possible information on the installed air conditioning equipment, together with information about the property in which it is fitted Give building owners/managers information about their buildings and plant, and to identify opportunities to save energy and cut operating costs ct as a back up to a building s Energy Performance ertificate by giving additional credibility to the sset Rating and supporting information to the SEM recommendations Question 37 Radiators are installed in an office area where air conditioning units have also been installed to prevent overheating caused by occupants, office machinery and lighting. You determine that both systems are able to operate at the same time, as overheating has occurred in spring and autumn. In your report, which ONE of the following measures will you recommend is introduced into the control system? The time clock control for both systems is made common n outdoor temperature sensor to reduce the indoor heating 2K proportional band in the temperature controls 2K dead band in the temperature controls Question 38 The Enhanced apital llowance (E) scheme is operated by which of the following: EFR H M Revenue & ustoms arbon Trust ll of the above 26

27 Question 39 To qualify for funding via the Enhanced apital llowance scheme the equipment which you recommend would have to be included in which ONE of the following? Energy Test List Energy Technology List Equipment Technology List Equipment Test List Question 40 With reference to the F-Gas Regulations for Refrigeration and ir onditioning (R) Systems, which of the following obligations is applicable to all stationary systems? Have company certification if employing personnel to undertake installation, maintenance or servicing of R systems Label new equipment adjacent to the service point/information and in the instruction manuals Recover F-gases during plant servicing and maintenance, and at the end of the plant life ll of the above 27