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181

Geothermal HVAC : green heating and cooling / Jay Egg, Brian Clark Howard. by Egg, Jay

Published 2011

Table of Contents: “…-- Summary -- 3: Geothermal Heat Pumps And Their Uses -- Passive and forced-air earth-coupled duct systems -- Water-source, forced-air heat pumps (water-to-air heat pumps) -- Direct expansion geothermal heat pumps -- Water-to-water heat pumps (heat pump chillers and boilers) -- Applications of geothermal heat pumps -- Pool heaters -- Domestic hot water -- Process cooling and heating -- Rooftop equipment -- Modular or piggyback units -- Package terminal heat pumps -- Vertical stack modular units -- 100% fresh air equipment -- Refrigeration systems -- Hybrid systems -- Superefficient DC HVAC -- Keeping the cows cool -- Summary -- 4: Earth Coupling Through Ground Loops -- Getting the load and loop size right -- Piping material -- Grout and backfill -- Manifolds or header systems -- Loop designs -- Vertical loops -- Horizontal loops -- Pond, lake, or ocean loops (use with caution) -- Pumping groundwater, lake water, or seawater (open-loop systems) -- Pump and reinjection -- Standing column wells -- Surficial aquifers and caisson infiltration -- Concerns with open loops -- Open loops versus closed loops -- Summary -- 5: Introduction To Load Sharing -- Benefits of load sharing -- Case of a large hotel -- Earth coupling as thermal savings bank -- Summary -- 6: Efficiency And Load Calculations Simplified -- Rating geothermal systems -- Annual fuel utilization efficiency (AFUE) (for gas furnaces) -- Cooling load in kW/ton -- Coefficient of performance (COP) -- Energy efficiency ratio (EER) -- Determining actual efficiencies -- Load calculations -- Manuals published by the air conditioning contractors of America -- Manual J: Residential heat gain and loss analysis -- Manual N: Commercial heat gain and loss analysis -- Manual D: Residential duct design -- Manual Q: Commercial low-pressure duct design -- Energy calculations and value -- Summary -- 7: Understanding Pricing And Geothermal Systems -- Factors that affect the price of geothermal HVAC -- Efficiency rating -- Quality -- System sizes -- Topography -- Load sharing -- Sales volume and competition -- Optional upgrades -- Heat recovery for domestic hot water -- Domestic hot water geothermal heat pumps -- Exchanger materials -- Compressor stages -- Hot gas reheat -- Intermediate exchangers -- Direct digital controls (DDC) -- Summary -- 8: Incentives, Tax Credits, Rebates -- U S federal tax credits -- Commercial tax credits and incentives -- Feingold-Ensign Support Renewable Energy Act -- Home star (cash for caulkers) -- Rural Energy Saving Program Act -- State and local incentives -- PACE funding -- Summary -- 9: Understanding Geothermal Project Proposals -- Typical geothermal HVAC proposals -- Poor proposals -- Good proposals -- Summary -- 10: How To Calculate Your Payback -- Determining ROI on residential systems -- ROI on geothermal pool heat pumps -- Calculating payback periods for commercial geothermal systems -- Net present value -- 30 cents a KWh: the big impact of higher electric rates -- Summary -- 11: Verifying Your Systems -- Actual SEER and EER results -- Factors that can affect efficiency -- Regional climate issues -- How to calculate your own EER -- Data points -- Minimum efficiency standards -- Summary -- 12: Life Cycles And Longevity -- Benefits of indoor equipment -- How to determine when upgrades pay off -- Summary -- 13: Common Problems And Horror Stories -- Word on water conservation -- Common issues -- Underground hazards -- Pressurized pockets -- Broken or damaged loops -- Design and installation fails -- Choosing the wrong loop type -- Unfinished jobs -- Pushy contracts -- Miscommunication, faulty equipment, inexperience-oh my! …”

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