Energy Audit and Conservation Loss

Question 1

What is the 4 steps in a detailed energy audit?

Answer 1

1.) Facility and Utility data analysis
2.) Methods and tasks (identifying needs and operating conditions)
3.) Baseline energy use to compare against.
4.) Evaluation of energy saving methods using LCC or simple payback

Question 2

What is BREEAM

Answer 2

Weighted percentage of many factors such as transport, land use and energy to get a score of 100

Question 3

What is LEED?

Answer 3

whole building environmental approach where points are allocated based on a checklist criteria.

Question 4

What is standard assessment procedure (SAP?

Answer 4

Home energy ratings used to calculate energy needed for heating and hot water. Rated from 0-100 with A-G given

Question 5

What is an EPC?

Answer 5

Tells you how costly it will be to heat and light your property, as well as the likely CO2 emissions. Gives recommended improvements.

Question 6

What is the biggest energy loss in housing? How can this be reduced?

Answer 6

Heat, insulating loft and walls

Question 7

How are recommended measures presented in an EPC?

Answer 7

Breaks down improvement and energy savings. Ratings are cumulative and assume you have installed the previous recommendations.

Question 8

What is National Home Energy Rating

Answer 8

Similar to SAP but includes details on occupancy and location to give more accurate calculations on CO2 emissions

Question 9

Why would NHER be used over SAP?

Answer 9

Can emphasise running costs on new, energy efficient housing.

Question 10

What is the building envelope?

Answer 10

Separation between interior and exterior environments of a building

Question 11

What is the building load coefficient?

Answer 11

Energy efficiency of the envelope, calculated by thermal resistance

Question 12

When should improvements to envelope not be done?

Answer 12

Commercial buildings

Question 13

What is primary and secondary HVAC

Answer 13

heating ventilation and AC
Primary - heating cooling equipment such as boiler
Secondary - includes systems such as variable air volume

Question 13

How is ventilation measured? Limitations?

Answer 13

Measuring the CO2 concentration
Does not reliably control pollutants from building materials etc.

Question 14

What is the role of ventilation in commercial vs industrial buildings

Answer 14

commercial - provides fresh air to occupants
Industrial - controls level of dust and fumes

Question 15

Energy Conservation measures for HVAC

Answer 15

-Thermostat temperatures, with setback during unoccupied times.
- Replace constant air systems with VAV
- Heat recovery from HVAC
Retrofit old boiler and cooling plants

Question 16

What are the main losses in compressed air systems?

Answer 16

Leaks and misapplication

Question 17

Energy conservation measures for compressed air systems

Answer 17

Repair leaks, install heat recovery or automatic controls.

Question 18

Main consumption in electrical systems. how to reduce?

Answer 18

Lighting - use energy efficient lighting daylighting controls

Question 19

What is a Building Energy Management System (BEMS)?

Answer 19

constantly monitors and controls services such as HVAC. Integrates functions for max energy savings and allows remote monitoring.

Question 20

Benefits of using a centralised BEMS vs distributed microprocessor.

Answer 20

Larger memory, sophisticated software and includes non energy functions such as security and fire alarms
Used for larger complex’s

Question 21

Benefits of using a Distributed microprocessor BEMS vs central

Answer 21

Cheaper, flexible and can function independently so less problems if central unit fails.

Question 22

What are building energy controllers?

Answer 22

Ensures heating is started at optimum time, monitoring internal/external T to compute best start times.