Chapter 18, Problem 19RQ

What is the principal health effect of radon as indoor pollutant?

P-Green Building features high-efficiency systems the following except: a. Heating b. Lighting c. Cooling d. Electricity e. None of the above

Potential buyers of a house ask for an inspection prior to the purchase. The inspector notesthat the geology underlying the house is known to have “hot spots” of radon emissions. Uponinvestigation the house is found to be on a hot spot that emits 2.0 pCi · m–2 · s–1 of radon gas.The ambient concentration outside of the house is negligible. The house basement and firstfloor each have a floor space of 56 m2. The ceiling height in both the basement and the firstfloor is 2.3 m. Does the concentration exceed the action level of 4 pCi · L–1 of air?

The Pertamina Energy Tower - A Primer on Green Skyscraper Design What techniques have been utilized by designers to solve these challenges? What specific sustainable technologies are utilized in the Pertamina Energy Tower?

What are the sources of particles in indoor pollution?

The filter for a room air-conditioning unit has an area of 1,600 sq cm. Howmany square inches are there in the filter?

Which of the following factors affect building energy use in the commercial sector (select all that apply)? Question 4 options: Location of building relative to mass transit availability Efficiency of equipment Availability of technology Efficiency of buildings Economic growth

As the consultant for designing STP, you proposed to use a completely-mix activated sludge system to treat sewage from a population of 45,000 PE. The sewage enters a primary clarifier with a BOD of 300 mg/L and SS of 360 mg/L. The primary clarifier removes 30% BOD and 60% SS. The aeration tank maintains a biomass concentration of about 3400 mg/L with a food to biomass ratio of 0.3 kg BOD5 per kg MLSS per day. The effluent BOD from the aeration tank is 16 mg/L. From a pilot plant study, the Y and kd values are 0.5 kg/kg and 0.06 per day respectively. Assume theunderflow concentration from the secondary clarifier of 9700 mg/L. Based on the above information, determine: i. The concentration of BOD and SS in the effluent of the primary clarifier ii. The volume of aeration iii. The mean cell residence time (MCRT). iv. The daily amount of biomass to be wasted.

A house is being built. The contractor states that the cost to install electricbaseboard heat will be $2,480. The contractor also states that a forced air,heat pump system will be 21⁄4 times as much. How much will the heat pumpsystem cost?