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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A large Hospital in Cork recently found things heating up fast following the breakdown of their main Air Conditioning Chiller; a temporary solution was needed as quickly as possible! The failed Air Conditioning system served the operating theatres, the rapid rise in temperature threatened to close down the theatres with a potential risk that many operations would have been cancelled. After contacting several chiller hire providers the Hospital chose CrossHire who were able to react fast and provide 400kW of cooling using a Trane chiller system which was connected direct into the hospitals existing air Conditioning ring main system. CrossHire delivered the replacement temporary chiller to site and within 24 hours from the initial contact it was installed commissioned and fully operational, enabling the hospital to continue to function without interruption. Commercial Director Andy Hamilton stated “The enquiry came in late on a Thursday afternoon, and by Friday afternoon the equipment was installed and running; the job is standard stuff to CrossHire, not only did we supplying the chiller but the installation involved us using more than sixty metres of temporary chilled water pipe work, electrical cabling, a temporary generator complete with a fully bunded diesel fuel tank. We also had to locate some pipe specialised adapters to attach to the clients existing ring main. The project was completed within the very demanding time requirements to the total satisfaction of the Hospital. CrossHire operate a fleet of modern highly energy efficient Trane chillers offering unequalled reliability. The Trane units are ideal for breakdown recovery applications, allowing utilisation of the clients existing pump sets without any modifications to the system. For more detail or informal discussions regarding Chiller Hire please call 0845 603 4135 or visit www.crosshire.ie

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In their industrial application, cooled water or other liquid from the chiller is pumped through process or laboratory equipment. Industrial chillers are used for controlled cooling of products, mechanisms and factory machinery in a wide range of industries. They are often used in the plastic industry in injection and blow molding, metal working cutting oils, welding equipment, die-casting and machine tooling, chemical processing, pharmaceutical formulation, food and beverage processing, vacuum systems, X-ray diffraction, power supplies and power generation stations, analytical equipment, semiconductors, compressed air and gas cooling. They are also used to cool high-heat specialized items such as MRI machines and lasers.

The chillers for industrial applications can be centralized, where each chiller serves multiple cooling needs, or decentralized where each application or machine has its own chiller. Each approach has its advantages. It is also possible to have a combination of both central and decentral chillers, especially if the cooling requirements are the same for some applications or points of use, but not all.

Decentral chillers are usually small in size (cooling capacity), usually from 0.2 tons to 10 tons. Central chillers generally have capacities ranging from ten tons to hundreds or thousands of tons.

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In their industrial application, cooled water or other liquid from the chiller is pumped through process or laboratory equipment. Industrial chillers are used for controlled cooling of products, mechanisms and factory machinery in a wide range of industries. They are often used in the plastic industry in injection and blow molding, metal working cutting oils, welding equipment, die-casting and machine tooling, chemical processing, pharmaceutical formulation, food and beverage processing, vacuum systems, X-ray diffraction, power supplies and power generation stations, analytical equipment, semiconductors, compressed air and gas cooling. They are also used to cool high-heat specialized items such as MRI machines and lasers.

The chillers for industrial applications can be centralized, where each chiller serves multiple cooling needs, or decentralized where each application or machine has its own chiller. Each approach has its advantages. It is also possible to have a combination of both central and decentral chillers, especially if the cooling requirements are the same for some applications or points of use, but not all.

Decentral chillers are usually small in size (cooling capacity), usually from 0.2 tons to 10 tons. Central chillers generally have capacities ranging from ten tons to hundreds or thousands of tons.

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In air conditioning systems, chilled water is distributed to heat exchangers, or coils, in air handling units, and used water is returned to the chiller. These cooling coils transfer sensible heat and latent heat from the air to the chilled water, thus cooling and usually dehumidifying the air stream. A typical chiller for air conditioning applications is rated between 15 to 1500 tons (180,000 to 18,000,000 BTU/h or 53 to 5,300 kW) in cooling capacity.

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A Chiller is a machine that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle. Most often water is chilled, but this water may also contain ~20% glycol and corrosion inhibitors; other fluids such as thin oils can be chilled as well.

Fully Chilled water is used to cool and dehumidify air in mid- to large-size commercial, industrial, and institutional (CII) facilities. Most chillers are designed for indoor operation, but a few are weather-resistant. Chillers are precision machines that are very expensive to purchase and operate, so great care is needed in their selection and maintenance. Engineers are normally retained to evaluate applications’ cooling needs, and to specify the optimal machines.

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When the working fluid is a gas that is compressed and expanded but doesn’t change phase, the refrigeration cycle is called a gas cycle. Air is most often this working fluid. As there is no condensation and evaporation intended in a gas cycle, components corresponding to the condenser and evaporator in a vapor compression cycle are the hot and cold gas-to-gas heat exchangers in gas cycles.

The gas cycle is less efficient than the vapor compression cycle because the gas cycle works on the reverse Brayton cycle instead of the reverse Rankine cycle. As such the working fluid does not receive and reject heat at constant temperature. In the gas cycle, the refrigeration effect is equal to the product of the specific heat of the gas and the rise in temperature of the gas in the low temperature side. Therefore, for the same cooling load, a gas refrigeration cycle will require a large mass flow rate and would be bulky.

Because of their lower efficiency and larger bulk, air cycle coolers are not often used nowadays in terrestrial cooling devices. The air cycle machine is very common, however, on gas turbine-powered ‘jet’ aircraft because compressed air is readily available from the engines’ compressor sections. These jet aircraft’s cooling and ventilation units also serve the purpose of pressurizing the aircraft.

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Vapor absorption cycle

In the early years of the twentieth century, the vapor absorption cycle using water-ammonia systems was popular and widely used but, after the development of the vapor compression cycle, it lost much of its importance because of its low coefficient of performance (about one fifth of that of the vapor compression cycle). Nowadays, the vapor absorption cycle is used only where waste heat is available, where heat is derived from solar collectors, or electricity is unavailable.

The absorption cycle is similar to the compression cycle, except for the method of raising the pressure of the refrigerant vapor. In the absorption system, the compressor is replaced by an absorber which dissolves the refrigerant in a suitable liquid, a liquid pump which raises the pressure and a generator which, on heat addition, drives off the refrigerant vapor from the high-pressure liquid. Some work is required by the liquid pump but, for a given quantity of refrigerant, it is much smaller than needed by the compressor in the vapor compression cycle. In an absorption refrigerator, a suitable combination of refrigerant and absorbent is used. The most common combinations are ammonia (refrigerant) and water (absorbent), and water (refrigerant) and lithium bromide(absorbent).

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