Showing 401 - 420 of 677 results:
Problem Set
Match the terms with the correct definition. Definition Key Term 1) Nominal heating output of heat pump at 47°F (Btu/hr) as tested. a. Design Heating Capacity 2) Heat pump’s heating output at the outdoor air winter design temperature (Btu/hr). b. Design Heating Load 3) Overall cooling efficiency...
Problem Set
1. Which of the following components are in both heat pumps and air conditioners? Compressor Indoor coil Expansion valve All of the above 2. Why do some heat pumps have auxiliary heat? Auxiliary heat is more efficient Heat pumps sometimes need assistance in very cold outdoor conditions or with a...
Problem Set
A homeowner would like to add cooling to two offices in their 3,000 SF home with natural gas boiler. What is the best option for a heat pump in this scenario? Replace an existing ducted furnace system with a ducted heat pump Install a heat pump as the primary heating system but keep the existing...
Problem Set
Explain three benefits of air source heat pumps compared to fossil fuel heating systems.
Problem Set
Which of the following should be assessed before installing a heat pump? Is the electrical panel sized to accommodate the heat pump? Is there space to locate the outdoor unit so it gets proper airflow? Does the difference between the gas and electric utility rates in the area favor heat pump...
Problem Set
Which of the following statements is not true when replacing a ducted furnace with a ducted heat pump? The ductwork should be assessed to ensure it is properly sized for the new equipment Air conditioning will not increase the risk of condensation on the ducts The existing ductwork should be...
Problem Set
Chris is considering replacing his natural gas boiler with a multi-zone ductless heat pump system. The boiler has an efficiency of 70% and the ductless mini-split has an HSPF of 11.5. Chris uses 1,000 therms per year and pays $0.66 per therm and $0.11 per kWh. How much would it cost to run each...
Lecture Notes
An introduction to air source heat pumps in HVAC systems. These notes include the basic concept of heat pumps and how they are used. Additionally it talks about how to properly choose a size and design of a heat pump to install. Lastly, it establishes key terms that are like to be common when...
Lecture Notes
In this lecture we focus on learning how a heat pump system transfers heat from one location to another. Additionally we look into determining ideal heat pump size and design to use and the benefits of installing them. Lastly, we look at ways to find rebates and tax incentives that decrease the...
Source
Study report on the demand response capability of HPWs compared with electric resistance water heaters
Problem Set
Which of the following statements is a correct statement of the “law of diminishing returns”? A. Every time you increase the thickness of the insulation, heat loss increases by a factor of two. B. As you reduce the insulation level, heat loss decreases at a 1:2 ratio. C. Every time you double your...
Problem Set
Consider Table 1 in the Objective 3.1 (i.e., “Example of the results summary table based on matrix [g] for several lighting products”) for example LCA results. Which product has the lowest hazardous waste to landfill? What aspect of the lighting products might be contributing to the landfill waste...
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