CrossHire, Air Conditioning Hire

When the server room air conditioning failed at a well known Sports Radio Station, CrossHire were fast to the rescue providing Portable Air Conditioning enabling things to cool down fast and prevent the server room from major failure.

Andy Hamilton Commercial Director commented “It’s all in a days work, reacting fast and providing cost effective temporary Air Conditioning solutions is just what we are about. No matter how large or small we react fast and cool things down, especially in business critical areas such as server rooms where temperature control is a key critical issue”
CrossHire can bee found at www.crosshire.ie or direct contact on 0845 603 4135. CrossHire can provide a wide range of Air Conditioning and Process Cooling products including Portable Air Conditioners ranging from 14000BTU to 35000BTU all available using standard 13amp supply. For larger jobs their Portable MTA and Trane Chillers range from 20kW to 660kw

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Before You Hire or Buy Portable Air Conditioning, it will help if you understand how to find the perfect match for your needs.

There are 4 principle types of Portable Air Conditioners available for Hire from CrossHire. Each environment requiring Portable Air Conditioning is different and therefore careful consideration needs to be made prior to choosing the best Air Conditioning Solution. CrossHire will be pleased to help, give advice and answer any questions regarding your Portable Air Conditioning needs. To help you choose you can Click Here to View our full selection ofPortable Air Conditioners.

The basic choice can be made from one of the following:

1. Evaporative coolers (swamp coolers)
2. Portable Exhaust tube Air Conditioning
3. Portable Split type Air Conditioning units (refrigerant)
4. Portable Split type Air Conditioning units (water cooled)

What should I consider before choosing a portable air conditioner?

The most important factor to consider the amount of cooling duty that is required for the area to be properly cooled. The amount of cooling duty required (measured in BTU or kW) will be impacted by several issues. i.e. size of area, number of people populating the area, numbers of items that generate heat e.g. PC, photocopiers, fax machines etc. Also the number of windows and the direction of the sun, i.e. buildings with south facing windows will require more cooling duty. Calculating the correct level of Air Conditioning duty required is important the correct decision can save hire costs and deliver the perfect cooling solution. To help you calculate the correct Air Conditioning duty for your environment please click here for the CrossHire Cooling

For a very quick guild the following can be used:

Different factors can reduce the effectiveness of portable air conditioners. Here are a few solutions that might increase or decrease BTU’s if you suspect the effectiveness of your portable air conditioner is going to be altered by an outside factor:

1. Reduce your required capacity by 10% if your room is heavily shaded.
2. Increase your capacity by 10% if your room is very sunny.
3. Add 600 BTU to your capacity for each additional person (beyond two people) that regularly occupies the same room.
4. Add 4,000 BTU if the room is a hotter than normal environment i.e. similar to a kitchen.

After deciding on the BTU/kW rating you need, the next issue to sort out is what type of Portable Air Conditioner to choose.

Portable Air Conditioners

The type of Portable Air Conditioner you choose may depend greatly on where you intend to exhaust it. Exhaust tube Air Conditioners remove the heat produced by the refrigeration circuit via exhaust tubes. Ideally the exhaust tube is Directed out of an adjacent window, however in some circumstances the heat can be removed via a suitable ceiling void or into other unused space. Each model and size of Exhaust Tube Air Conditioner is capable of different performance. For example with the following models available from CrossHire the exhaust tube can be extended to a maximum of 1.8 meters from the air conditioning unit:

Portable air conditioner model – Coolair 14 = 2.5 meters

The Coolair 14 is a very popular portable Air conditioner. Small and compact, this model unit has a smart modern look and is very easy to install and use, despite its size it produces a very powerful 4.1kW (14000 BTU) of portable air-conditioning, it also has a fully automatic thermostat and comes complete with a remote control.

Portable air conditioner model – Coolair 15 = 2.5 meters

The Coolair 15 is a very popular portable Air conditioner; it is slightly more powerful than its sister the Coolair 14 producing a credible 4.4 kW (15000BTU) of cooling. Small and compact, this model unit has a smart modern look and is very easy to install and use. It has a fully automatic thermostat and comes complete with a remote control. In more sophisticated models with high powered fans the exhaust tube can be extended longer for example:

Portable air conditioner model – Coolbreeze 15E = 5 meters

The Coolbreeze 15E portable air conditioner delivers 4.4kW (15000BTU) of cooling power, it is a very efficient and extremely well built portable air conditioning unit. It is easy to use, robust and portable unit capable of producing large volumes of cool air.

Portable air conditioner model – Coolbreeze 20E = 10 maters

The Coolbreeze 20E portable air conditioner delivers 5.9kW (20000BTU) of cooling power, it is a very efficient and extremely well built portable air conditioning unit. It is easy to use, robust and portable unit capable of producing large volumes of cool air.

Portable air conditioner model – Coolbreeze 27E = 10 meters

The Coolbreeze 27E portable air conditioner delivers 7.9kW (27000BTU) of cooling power, it is a very efficient and extremely well built portable air conditioning unit. It is easy to use, robust and portable unit capable of producing large volumes of cool air.

Portable air conditioner model – Coolbreeze 35E = 10 meters

The Coolbreeze 35E portable air conditioner delivers 10.25kW (35000BTU) of cooling power. Probably the most powerful unit that works reliably off a 13AMP UK circuit. It is a very efficient and extremely well built portable air conditioning unit. It is easy to use, robust and portable unit capable of producing large volumes of cool air. Due to its immense air moving system the unit is capable of working and cooling at almost any remote location – making it probably the most versatile unit currently available in the U.K.

Split type Air Conditioning units are connected to external heat exchange units; these outdoor units remove the heat produced by the indoor refrigeration circuit. CrossHire only use the highest quality water cooled split units enabling the indoor Air Conditioning unit to be separated fro the external Heat Exchange unit by up to 30 meters:

Portable air conditioner model – Cool Breeze 15P

The Coolbreeze 15P portable air conditioner delivers a powerful 4.4kW (15000BTU) of cooling power. This unit is very efficient water – cooled ‘Split’ portable air conditioner. There are two parts to this model, the room unit and the external condenser unit. The two units are connected by a flexible hose. By connecting to multiple hoses the smaller condenser unit can be placed up to 30 meters from the room unit.

Portable air conditioner model – Cool Breeze 22P

The Coolbreeze 22P portable air conditioning unit delivers a huge 6.5kW (22000 BTU) of cooling power. This is a larger and more powerful water cooled ‘Split’ portable air conditioning system. There are two parts to the system, the room unit and the external condenser unit; the two are connected by a flexible hose. The smaller condenser unit can be placed up to 30 meters from the room unit.

Portable air conditioner model – Cool Breeze 25P

Combining a quiet & powerful room cooling unit, with a remote condenser capable of operating up to 35 metres distance, the Cool breeze 25P provides the user with 25,000 BTU’s (7.3kW) of cooling to be positioned exactly where needed. Easy to connect and extend, small diameter non-leak water-filled flexible line connections, allow this unit to operate as installed air conditioning, giving highly efficient room cooling.

Evaporative coolers

Evaporative coolers (also called swamp, desert, or air coolers) are devices that cool air through the simple evaporation of water. They differ from refrigeration or absorption air conditioning, which use the vapor-compression or absorption refrigeration cycles. In the United States, small-scale evaporative coolers are called swamp coolers by some users due to the humid air conditions produced. The name sump cooler is also used. Air washers and wet cooling towers utilize the same principles as evaporative coolers, but are optimized for purposes other than air cooling.

Evaporative cooling is especially well suited for climates where the air is hot and humidity is low. For example, in the United States, the western/mountain states are good locations, with swamp coolers very prevalent in cities like Denver, Salt Lake City, Albuquerque, El Paso and Phoenix, where sufficient water is available. Evaporative air conditioning is also popular and well suited to the southern (temperate) part of Australia. In dry climates, the installation and operating cost of an evaporative cooler can be much lower than refrigerate air conditioning, often by 80% or so. But evaporative cooling and vapor-compression air conditioning are sometimes used in combination to yield optimal performance. Some evaporative coolers may also serve as humidifiers in the heating season.

In moderate humidity locations there are many cost-effective uses for evaporative cooling, in addition to their widespread use in dry climates. For example, industrial plants, commercial kitchens, laundries, dry cleaners, greenhouses, spot cooling (loading docks, warehouses, factories, construction sites, athletic events, workshops, garages, and kennels) and confinement farming (poultry ranches, hog, and dairy) all often employ evaporative cooling. In highly humid climates, evaporative cooling may have little thermal comfort benefit beyond the increased ventilation and air movement it provides.

Portable Evaporative Cooler model – Commander 3000

Combining the ultimate in elegance with superior performance, the Commander 3000 features an exceptionally powerful fan, a motorised rotating grille for even airflow and a healthy natural cooling system. It is the perfect solution for cooling every corner of a large open room.

Portable Evaporative Cooler model – Breezair

The mobile Breezair cooler will bring benefit to a large number of industries including factories, warehouses, mezzanine floors, sports centres, fitness centres, shops, showrooms, conference rooms and temporary tents and marquees to name but a few. Often it will not be necessary to cool a large building completely but it might be a requirement just to cool a specific area or process or a group of people. The mobile cooler is ideal for this purpose. It can be simply wheeled into position and is ready to use almost immediately.

You can calculate the air-conditioning duty for your requirements on the CrossHire.
However the team at CrossHire will guide you through and advise on the best models for you,
simply call 0845 603 4135

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CrossHire were recently called on to provide and install cooling for a major Town Hall server room. Things started to heat up when an existing system failed and parts were unattainable for several weeks. The response was very fast and within 24 hours from receiving the call CrossHire had completed the installation and commissioning of a 100kW chiller complete with internal air handling units and all associated pipe work. Commercial Director Andy Hamilton stated. “The chiller system was situated away from the main building in an adjacent car park; the job was a standard installation the type we are called on to install regularly. We were able to get the server room back to temperature very fast with the minimum of disruption and downtime”. CrossHire have an extensive range of portable chillers and air handling units for hire; the hire fleet ranges from 10kW MTA chillers to 600kW Trane units; Andy Hamilton goes on to state “we also have the added advantage that our chiller hire fleet is new, the range give us the capability to manage most air conditioning and process cooling applications”. For more information visit www.crosshire.ie or for a more detailed discussion call 0845 603 4135

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Traditionally, evaporative cooler pads consist of excelsior (wood wool) (aspen wood fiber) inside a containment net, but more modern materials, such as some plastics and melamin paper, are entering use as cooler-pad media. Wood absorbs some of the water, which allows the wood fibers to cool passing air to a lower temperature than some synthetic materials. The thickness of the padding media plays a large part in cooling efficiency, allowing longer air contact. For example, an eight-inch-thick pad with its increased surface area will be more efficient than a one-inch pad.

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Typically, residential and industrial evaporative coolers use direct evaporation and can be described as an enclosed metal or plastic box with vented sides containing a centrifugal fan or ‘blower’, electric motor with pulleys (known as ’sheaves’ in HVAC]), and a water pump to wet the evaporative cooling pads. The units can be mounted on the roof (down draft, or downflow), or exterior walls or windows (side draft, or horizontal flow) of buildings. To cool, the fan draws ambient air through vents on the unit’s sides and through the damp pads. Heat in the air evaporates water from the pads which are constantly re-dampened to continue the cooling process. Thus cooled, moist air is then delivered to the building via a vent in the roof or wall.
Because the cooling air originates outside the building, one or more large vents must exist to allow air to move from inside to outside. Air should only be allowed to pass once through the system, or the cooling effect will decrease. This is due to the air reaching the saturation point. Often 15 or so air changes per hour (ACHs) occur in spaces served by evaporative coolers.

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Evaporative cooling is a physical phenomenon in which evaporation of a liquid, typically into surrounding air, cools an object or a liquid in contact with it. Latent heat describes the amount of heat that is needed to evaporate the liquid; this heat comes from the liquid itself and the surrounding gas and surfaces. When considering water evaporating into air, the wet-bulb temperature, as compared to the air’s dry-bulb temperature, is a measure of the potential for evaporative cooling. The greater the difference between the two temperatures, the greater the evaporative cooling effect. When the temperatures are the same, no net evaporation of water in air occurs, thus there is no cooling effect.
The simplest example would be perspiration, or sweat, which the body secretes in order to cool itself. The amount of heat transfer depends on the evaporation rate, which in turn depends on the humidity of the air and its temperature, which is why one sweats more on hot, humid days.
Another, recent application of evaporative cooling is the “self-refrigerating” beverage can.[1] A separate compartment inside the can contains a desiccant and cooling liquid. Just before consumption, the desiccant comes into contact with the cooling liquid, inducing evaporation.
Evaporative cooling is a very common form of cooling buildings for thermal comfort since it is relatively cheap and requires less energy than many other forms of cooling. However evaporative cooling requires an abundant water source as an evaporate, and is only efficient when the relative humidity is low, restricting its effective use to dry climates. Evaporative coolers are colloquially referred to as swamp coolers in the U.S. In other places they are known as desert coolers.
Evaporative cooling is commonly used in cryogenic applications. The vapor above a reservoir of cryogenic liquid is pumped away, and the liquid continuously evaporates as long as the liquid’s vapor pressure is significant. Evaporative cooling of ordinary helium forms a 1-K pot, which can cool to at least 1.2 K. Evaporative cooling of helium-3 can provide temperatures below 300 mK. Each of these techniques can be used to make cryocoolers, or as components of lower-temperature cryostats such as dilution refrigerators. As the temperature decreases, the vapor pressure of the liquid also falls, and cooling becomes less effective. This sets a lower limit to the temperature attainable with a given liquid.
This process has recently been observed to operate on a planetary scale on Pluto and acts as an Anti-Greenhouse Effect.
Evaporative cooling is also the last cooling step in order to reach the ultra-low temperatures required for Bose-Einstein Condensation (BEC). Here, so-called forced evaporative cooling is used to selectively remove high-energetic (“hot”) atoms from an atom cloud until the remaining cloud is cooled below the BEC transition temperature. For a cloud of 1 million alkali atoms, this temperature is about 1μK.

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Civilizations throughout the ages have found ingenious ways to combat the heat in their region. An earlier form of air cooling, the windcatcher (Bâd gir), was invented in Persia (Iran) thousands of years ago in the form of wind shafts on the roof, which caught the wind and passed it through water and blew the cooled air into the building.[1] Nowadays Iranians have changed the windcatcher into an evaporative cooler (Coolere Âbi) and use it widely. There are 9,000,000 evaporative coolers in central Iran, and in just the first two months of year 1385 in the (Persian/Iranian calender) (April–May 2006) 130,000 evaporative coolers were sold in Iran.
Evaporative cooling was in vogue for aircraft designs for some time in the late 1930s. In this case the system was used in order to reduce, or eliminate completely, the radiator which would otherwise create considerable drag. In these systems the water in the engine was kept under pressure with pumps, allowing it to heat to temperatures above 100 Celsius, as the actual boiling point is a function of the pressure. The super-heated water was then sprayed though a nozzle into an open tube, where it rapidly boiled and released its heat. The tubes could be placed under the skin of the aircraft, resulting in a zero-drag cooling system.
However these systems also had serious disadvantages. Since the amount of tubing needed to cool the water was large, the cooling system covered a significant portion of the plane even though it was hidden. This led to all sorts of added complexity and the systems were always terribly unreliable. In addition this large size meant it was very easy for it to be hit by enemy fire, and practically impossible to armor. British and US attempts to use the system turned to ethylene glycol instead. The Germans instead used streamlining and positioning of traditional radiators. Even its most ardent supporters, Heinkel’s Günter brothers, eventually gave up on it in 1940.
Evaporative cooling was used in some automobiles, often as aftermarket accessories, until modern vapor-compression air-conditioning became widely available.

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Evaporative coolers (also called swamp, desert, or air coolers) are devices that cool air through the simple evaporation of water. They differ from refrigeration or absorption air conditioning, which use the vapor-compression or absorption refrigeration cycles. In the United States, small-scale evaporative coolers are called swamp coolers by some users due to the humid air conditions produced. The name sump cooler is also used. Air washers and wet cooling towers utilize the same principles as evaporative coolers, but are optimized for purposes other than air cooling.
Evaporative cooling is especially well suited for climates where the air is hot and humidity is low. For example, in the United States, the western/mountain states are good locations, with swamp coolers very prevalent in cities like Denver, Salt Lake City, Albuquerque, El Paso and Phoenix, where sufficient water is available. Evaporative air conditioning is also popular and well suited to the southern (temperate) part of Australia. In dry climates, the installation and operating cost of an evaporative cooler can be much lower than refrigerative air conditioning, often by 80% or so. But evaporative cooling and vapor-compression air conditioning are sometimes used in combination to yield optimal performance. Some evaporative coolers may also serve as humidifiers in the heating season.
In moderate humidity locations there are many cost-effective uses for evaporative cooling, in addition to their widespread use in dry climates. For example, industrial plants, commercial kitchens, laundries, dry cleaners, greenhouses, spot cooling (loading docks, warehouses, factories, construction sites, athletic events, workshops, garages, and kennels) and confinement farming (poultry ranches, hog, and dairy) all often employ evaporative cooling. In highly humid climates, evaporative cooling may have little thermal comfort benefit beyond the increased ventilation and air movement it provides.

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