Thursday, December 2, 2010

air conditioning heat pumps

High-efficiency pumps for OEM applications in refrigeration and air conditioning and heat pumps and heating

The "Wilo-Stratos Pico OEM" the pump expert Wilo has its range in high-efficiency pumps for OEM applications in the refrigeration and air-conditioning and heat pumps for heating applications and is a particularly energy-saving model rounded.

The electronically controlled wet-rotor pump has a very low power consumption in a compact design and is designed for a range of fluid between +2 ° C and +110 ° C suitable. It can also water-/glykol-mixes up to a ratio of 1:1 should be encouraged. The new high-efficiency pump is designed for heads up to 6 meters.

The "Wilo-Stratos PICO OEM" consumed by a newly developed pump motor with "3-watt technology," only half as much electricity as required by the current best energy efficiency class A for heating pumps. This is the new high-efficiency pump - the manufacturer - with up to 90 percent power savings compared to the old unregulated pumps more efficiently than any other pump energy efficiency class A.

Monday, August 9, 2010

Air-Cooler Condensers

In many process plants, the pump alleys are covered with forceddraft, air-cooled condensers. Dozens of coolers are arranged in parallel. I have seen services where 300 mm Btu/h of condensation duty was easily handled by aerial cooling. All these large systems had one problem in common. They all tended to have higher flows through cooling banks connected closest to the inlet and/or outlet headers. The higher relative flows were indicated by both higher air outlet and higher process outlet temperatures.

The mechanism that causes this often-severe flow maldistribution is based on low-temperature dew-point corrosion, as explained below. Here is a rather common example, assuming that the main corrodants are chlorides, in a hydrogen sulfide–rich, condensing hydrocarbon vapor:
1. A small amount of ammonia is injected into the overhead vapor line to control the pH of a downstream water draw.
2. Vapor-phase ammonium chloride is formed.
3. Tube bundles nearest the inlet header tend to see perhaps 1 percent more flow than the tube bundles farthest from the inlet header.
4. Bundles seeing the lower flows have slightly lower outlet temperatures.
5. Lower temperature favors the sublimation of ammonium chloride vapor to a white saltlike solid.
6. This salt is very hydroscopic, meaning that it will absorb and condense water vapor from the flowing hydrocarbon vapor stream at unexpectedly high temperatures.

Wednesday, June 30, 2010

air conditioning system design manual

Air Conditioning System Design Manual, Second Edition (Ashrae Special Publications)The Air Conditioning design Manual was written to assist entry-level engineers in the design of air-conditioning systems. It is also suable -- in conjuction with fundamental HVAC&R resourcee material -- as a senior- or graduate-level text for a university course in HVAC system design. The manual was written to fill the void between theory and practice -- to bridge the gap between real-world design practices and the theoretical caluclations and analytical procedures or on the design of components.

* Helps engineers quickly come up with a design solution to a required air conditioning system.
* Includes issues from comfort to cooling load calculations.
* New sections on "Green HVAC" systems deal with hot topic of sustainable buildings.

Wednesday, May 26, 2010

air conditioning toolbox manual

Air Conditioning and Refrigeration Toolbox Manual: The Perfect On-the-Job Refernce Manual for Journeymen and Apprentice Cooling TechniciansFor professionals in the air-conditioning and refrigeration installation and repair trade, this book is an essential toolbox guide. Covers compressors, controls, components, motors, pipe, tube, valves and fittings, whole systems, and ozone-friendly refrigerants. Describes physics of vapor-compression and absorption cycles, and operation and installation of complete systems.
Complete coverage of tubing: choosing, bending, and installing. Full description of all popular metering devices and electrical and electronic controls, heavily illustrated. There is lot's of interesting information in this air conditioning manual.
20 pages of troubleshooting for vapor-compression and ammonia systems, metering devices, oil-control systems, for air- and water-cooled condensers, motors and pumps. Standard ACR procedures include draining and adding oil, system startup and cleanup, detecting leaks, recovering refrigerant, drying, evacuating and charging a system, and periodic maintenance.

Wednesday, February 3, 2010

Refrigeration and Air Conditioning Book Review

We are looking for a good book review on refrigeration and Air Conditioning Technology. Any good review of this book will be published here.