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  1. steveski

    Smartcool ECO3

    Cbruce, thank you for your post. Please let me/us know if any utilities offer incentives to customers who install your products. Also, have your products been evaluated for inclusion in the “DEER” Database? (Database for Energy Efficient Resources, http://www.energy.ca.gov/deer/) Thanks.
  2. steveski

    Smartcool ECO3

    We are asked by a municipal utility to evaluate a vendor’s energy savings claims with this “Smartcool ECO3”. Smartcool’s website appears more fluff than substance. Sometimes a good litmus test of black box technologies is whether other (especially larger) utilities incentivize it. (I’m not...
  3. steveski

    Natural Gas Booster Compressor

    I found a gas booster which looks promising: http://www.secomak.com/gas_boosters.asp Have any of you had experience with something like this?
  4. steveski

    Natural Gas Booster Compressor

    We are working on a project in which the medium-pressure gas piping was sized for 2 psig, but the available pressure is 1 psig. We are currently sizing the pipe for 1 psig, which will require tearing out and replacing a significant amount of pipe. Do you know if it is legal and feasible to...
  5. steveski

    100% Outside Air Gas/Electric Packaged Unit

    As I've continued to delve into this topic I've come across the indirect evaporative pre-cooler option, which can, for example, bring the dry bulb temp down from 105F to 80F without adding moisture, then the DX coil can take it from 80F to, say 60F. With this set-up a 27.5 ton unit can...
  6. steveski

    100% Outside Air Gas/Electric Packaged Unit

    Thank you for your reply, I appreciate it.
  7. steveski

    100% Outside Air Gas/Electric Packaged Unit

    I'm investigating the operation of an existing 30-ton 100% outside air package unit (nominal 12,000 cfm). Our design conditions are around 105F. I was told that if we try to cool 12,000 cfm to 55F we can ruin our compressors. Our options are therefore to either lower the cfm or increase the...
  8. steveski

    Tanning Salon HVAC

    We're designing HVAC for a small tanning salon (storefront with individual rooms where folks pay to get a quick tan under lights). The space has a number of private rooms, each with a tanning bed. Each tanning bed apparently will require around a sensible ton of AC. If anyone in the forum has...
  9. steveski

    Budgetary Cost for Variable Speed Drives

    Can anyone tell me an approximate budgetary number to use for the cost of Variable Speed Drives? I would like to have a "dollars per horsepower" number if possible. I understand this number will likely be higher for smaller motors. The motor sizes I am working with range from 15 hp to 100 hp...
  10. steveski

    Looking for a Totalizing Fuel Meter

    Can anyone recommend a brand of Totalizing Fuel Meter suitable for measuring natural gas use by a 1,500,000 btu/hr hot water boiler. This is being required by our local Air Quality Management District as a condition of our Authority-to-Construct permit. Thank you very much.
  11. steveski

    Residential Mechanical Ventilation Question

    A contractor friend of mine is trying to get a permit for a large custom home including a media room (approximately 600 SF). The media room is completely enclosed, with no windows. The plan checker made the following comment: “Provide a mechanical ventilation system designed by a licensed...
  12. steveski

    Refrigeration Machinery Room Requirement Triggered by Retrofit?

    A client (department store in California) has a built-up system in a mezzanine-level equipment room. The compressors are at mezzanine level, and the (two) condensers are on the roof. The project I’m working on involves removing the two existing condensers and compressors and replacing them with...
  13. steveski

    Heat Iniput Required to Raise Air Temp from 70F to 1537F

    Thank you both for your help.
  14. steveski

    Heat Iniput Required to Raise Air Temp from 70F to 1537F

    I need to calculate the theoretical heat required to raise the temperateure of dry air from 70F to 1537F. I did it once using mean heat capacity and got 375 btu/(lb-mass). I did it again integrating the heat capacities expressed as power series and got 377 btu/(lb-mass). So, I'm feeling pretty...
  15. steveski

    Power Exhaust

    What are the basic issues to consider when deciding whether an HVAC unit will require "Power Exhaust"? Example: New HVAC unit with outside air economizer & demand-control ventilation serving a high-school cafeteria. Thank you.
  16. steveski

    Estimating Small Heat Loads in a Deli

    I'm sizing the HVAC for a deli which will have microwave ovens, coffee pots, refrigerators, ad other small heat loads. Can you recommend a resource I can use to estimate these heat loads? Thank you.
  17. steveski

    Where to purchase code books

    I would like to purchase the 1998 California Uniform Plumbing Code and 1998 California Uniform Mechanical Code. Can anyone recomeend a good vendor to purchase these from? Thanks.

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