Refrigeration & Air Conditioning Mechanic Red Seal · Question
Considering Canadian climate extremes, why is the design outdoor temperature for heating load calculations typically much lower than the average winter temperature?
Design outdoor temperatures are selected based on extreme historical weather data (e.g., 99% design day in ASHRAE), ensuring the HVAC system has sufficient capa
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Question: Considering Canadian climate extremes, why is the design outdoor temperature for heating load calculations typically much lower than the average winter temperature?
Answer options:
- To account for potential equipment malfunctions during peak cold snaps. ✅ To ensure the HVAC system can maintain indoor comfort during the coldest anticipated period.
- To reduce equipment sizing and save on initial installation costs.
- To compensate for poor building insulation and air sealing.
Correct answer: To ensure the HVAC system can maintain indoor comfort during the coldest anticipated period.
Explanation: Design outdoor temperatures are selected based on extreme historical weather data (e.g., 99% design day in ASHRAE), ensuring the HVAC system has sufficient capacity to meet the building's peak heating demand during the coldest periods, thus maintaining occupant comfort.
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- Which of the following refrigerants is a hydrofluorocarbon (HFC) and has a high ozone depletion potential (ODP
- Which component is responsible for compressing the refrigerant vapour to a high pressure and temperature?
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